Update to determinate by default (#208)

* Update to determinate by default

Implements https://github.com/DeterminateSystems/nix-src/issues/201

* Fixup the version verification script

.editorconfig

@@ -0,0 +1,10 @@
+# https://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.eslintrc.json

@@ -1,75 +1,74 @@
 {
-    "plugins": [
-        "@typescript-eslint"
-    ],
-    "extends": [
-        "plugin:github/recommended"
-    ],
-    "parser": "@typescript-eslint/parser",
-    "parserOptions": {
-        "ecmaVersion": 9,
-        "sourceType": "module",
-        "project": "./tsconfig.json"
-    },
-    "rules": {
-        "i18n-text/no-en": "off",
-        "eslint-comments/no-use": "off",
-        "import/no-namespace": "off",
-        "no-unused-vars": "off",
-        "@typescript-eslint/no-unused-vars": [
-            "error",
-            {
-                "argsIgnorePattern": "^_"
-            }
-        ],
-        "@typescript-eslint/explicit-member-accessibility": [
-            "error",
-            {
-                "accessibility": "no-public"
-            }
-        ],
-        "@typescript-eslint/no-require-imports": "error",
-        "@typescript-eslint/array-type": "error",
-        "@typescript-eslint/await-thenable": "error",
-        "@typescript-eslint/ban-ts-comment": "error",
-        "camelcase": "off",
-        "@typescript-eslint/consistent-type-assertions": "error",
-        "@typescript-eslint/explicit-function-return-type": [
-            "error",
-            {
-                "allowExpressions": true
-            }
-        ],
-        "@typescript-eslint/func-call-spacing": [
-            "error",
-            "never"
-        ],
-        "@typescript-eslint/no-array-constructor": "error",
-        "@typescript-eslint/no-empty-interface": "error",
-        "@typescript-eslint/no-explicit-any": "error",
-        "@typescript-eslint/no-floating-promises": "error",
-        "@typescript-eslint/no-extraneous-class": "error",
-        "@typescript-eslint/no-for-in-array": "error",
-        "@typescript-eslint/no-inferrable-types": "error",
-        "@typescript-eslint/no-misused-new": "error",
-        "@typescript-eslint/no-namespace": "error",
-        "@typescript-eslint/no-non-null-assertion": "warn",
-        "@typescript-eslint/no-unnecessary-qualifier": "error",
-        "@typescript-eslint/no-unnecessary-type-assertion": "error",
-        "@typescript-eslint/no-useless-constructor": "error",
-        "@typescript-eslint/no-var-requires": "error",
-        "@typescript-eslint/prefer-for-of": "warn",
-        "@typescript-eslint/prefer-function-type": "warn",
-        "@typescript-eslint/prefer-includes": "error",
-        "@typescript-eslint/prefer-string-starts-ends-with": "error",
-        "@typescript-eslint/promise-function-async": "error",
-        "@typescript-eslint/require-array-sort-compare": "error",
-        "@typescript-eslint/restrict-plus-operands": "error",
-        "@typescript-eslint/type-annotation-spacing": "error",
-        "@typescript-eslint/unbound-method": "error"
-    },
-    "env": {
-        "node": true,
-        "es6": true
+  "plugins": ["@typescript-eslint"],
+  "extends": ["plugin:github/recommended"],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 9,
+    "sourceType": "module",
+    "project": "./tsconfig.json"
+  },
+  "settings": {
+    "import/resolver": {
+      "typescript": {}
     }
+  },
+  "rules": {
+    "i18n-text/no-en": "off",
+    "eslint-comments/no-use": "off",
+    "import/no-namespace": "off",
+    "no-unused-vars": "off",
+    "@typescript-eslint/no-unused-vars": [
+      "error",
+      {
+        "argsIgnorePattern": "^_"
+      }
+    ],
+    "@typescript-eslint/explicit-member-accessibility": [
+      "error",
+      {
+        "accessibility": "no-public"
+      }
+    ],
+    "@typescript-eslint/no-base-to-string": "error",
+    "@typescript-eslint/no-require-imports": "error",
+    "@typescript-eslint/array-type": "error",
+    "@typescript-eslint/await-thenable": "error",
+    "@typescript-eslint/ban-ts-comment": "error",
+    "camelcase": "error",
+    "@typescript-eslint/consistent-type-assertions": "error",
+    "@typescript-eslint/explicit-function-return-type": [
+      "error",
+      {
+        "allowExpressions": true
+      }
+    ],
+    "@typescript-eslint/func-call-spacing": ["error", "never"],
+    "@typescript-eslint/no-array-constructor": "error",
+    "@typescript-eslint/no-empty-interface": "error",
+    "@typescript-eslint/no-explicit-any": "error",
+    "@typescript-eslint/no-floating-promises": "error",
+    "@typescript-eslint/no-extraneous-class": "error",
+    "@typescript-eslint/no-for-in-array": "error",
+    "@typescript-eslint/no-inferrable-types": "error",
+    "@typescript-eslint/no-misused-new": "error",
+    "@typescript-eslint/no-namespace": "error",
+    "@typescript-eslint/no-non-null-assertion": "warn",
+    "@typescript-eslint/no-unnecessary-qualifier": "error",
+    "@typescript-eslint/no-unnecessary-type-assertion": "error",
+    "@typescript-eslint/no-useless-constructor": "error",
+    "@typescript-eslint/no-var-requires": "error",
+    "@typescript-eslint/prefer-for-of": "warn",
+    "@typescript-eslint/prefer-function-type": "warn",
+    "@typescript-eslint/prefer-includes": "error",
+    "@typescript-eslint/prefer-string-starts-ends-with": "error",
+    "@typescript-eslint/promise-function-async": "error",
+    "@typescript-eslint/require-array-sort-compare": "error",
+    "@typescript-eslint/restrict-plus-operands": "error",
+    "@typescript-eslint/type-annotation-spacing": "error",
+    "@typescript-eslint/unbound-method": "error"
+  },
+  "env": {
+    "node": true,
+    "es6": true
+  }
 }

.github/verify-version.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+# This script verifies that the version of Nix installed on the runner
+# matches the version supplied in the first argument.
+
+EXPECTED_VERSION="${1}"
+
+INSTALLED_NIX_VERSION_OUTPUT=$(nix --version)
+INSTALLED_NIX_VERSION=$(echo "${INSTALLED_NIX_VERSION_OUTPUT}" | awk '{print $NF}')
+
+if [ "${INSTALLED_NIX_VERSION}" != "${EXPECTED_VERSION}" ]; then
+  echo "Nix version ${INSTALLED_NIX_VERSION} didn't match expected version ${EXPECTED_VERSION}"
+  exit 1
+else
+  echo "Success! Nix version ${INSTALLED_NIX_VERSION} installed as expected"
+  exit 0
+fi

.github/workflows/ci.yml

@@ -7,100 +7,81 @@ on:
   workflow_dispatch:
 
 jobs:
+  tests:
+    runs-on: ubuntu-22.04
+    needs:
+      - check-dist-up-to-date
+      - install-nix
+      - install-with-non-default-source-inputs
+      - install-no-id-token
+    # NOTE(cole-h): GitHub treats "skipped" as "OK" for the purposes of required checks on branch
+    # protection, so we take advantage of this fact and fail if any of the dependent actions failed,
+    # or "skip" (which is a success for GHA's purposes) if none of them did.
+    if: failure()
+    steps:
+      - name: Dependent checks failed
+        run: exit 1
+
   check-dist-up-to-date:
     name: Check the dist/ folder is up to date
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3
-      - run: npm install --no-save
-      - run: npm run all
-      - run: git status --porcelain=v1
-      - run: test $(git status --porcelain=v1 2>/dev/null | wc -l) -eq 0
-  run-x86_64-linux:
-    name: Run x86_64 Linux
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/flakehub-cache-action@main
+      - name: pnpm install
+        run: nix develop --command pnpm install
+      - name: prettier format
+        run: nix develop --command pnpm run check-fmt
+      - name: ESLint
+        run: nix develop --command pnpm run lint
+      - name: tsup build
+        run: nix develop --command pnpm run build
+      - name: ncc package
+        run: nix develop --command pnpm run package
+      - name: Git status
+        run: git status --porcelain=v1
+      - name: Ensure no staged changes
+        run: git diff --exit-code
+
+  install-nix:
+    name: "Test: ${{ matrix.runner }}${{ matrix.determinate && ' with determinate' || '' }}"
     strategy:
+      fail-fast: false
       matrix:
         runner:
-            - ubuntu-latest
-            - nscloud-ubuntu-22.04-amd64-4x16
-            - namespace-profile-default-arm64
+          - ubuntu-latest
+          - nscloud-ubuntu-22.04-amd64-4x16
+          - namespace-profile-default-arm64
+          # - macos-12-large # determinate-nixd is broken on macos-12
+          - macos-13-large
+          - macos-14-large
+          - macos-14-xlarge # arm64
+        determinate:
+          - true
+          - false
     runs-on: ${{ matrix.runner }}
+    permissions:
+      contents: read
+      id-token: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Nix
         uses: ./
         with:
           logger: pretty
           log-directives: nix_installer=trace
           backtrace: full
+          _internal-strict-mode: true
+          determinate: ${{ matrix.determinate }}
       - name: echo $PATH
         run: echo $PATH
-      - name: Test `nix` with `$GITHUB_PATH`
-        if: success() || failure()
-        run: |
-          nix run nixpkgs#hello
-          nix profile install nixpkgs#hello
-          hello
-          nix store gc
-          nix run nixpkgs#hello
-      - name: Test bash
-        run: nix-instantiate -E 'builtins.currentTime' --eval
-        if: success() || failure()
-        shell: bash --login {0}
-      - name: Test sh
-        run: nix-instantiate -E 'builtins.currentTime' --eval
-        if: success() || failure()
-        shell: sh -l {0}
-      - name: Install Nix again (noop)
-        uses: ./
-        with:
-          logger: pretty
-          log-directives: nix_installer=trace
-          backtrace: full
-      - name: Test `nix` with `$GITHUB_PATH`
-        if: success() || failure()
-        run: |
-          nix run nixpkgs#hello
-          nix profile install nixpkgs#hello
-          hello
-          nix store gc
-          nix run nixpkgs#hello
-      - name: Reinstall Nix
-        uses: ./
-        with:
-          logger: pretty
-          log-directives: nix_installer=trace
-          backtrace: full
-          reinstall: true
-          extra-conf: |
-            use-sqlite-wal = true
-      - name: Test `nix` with `$GITHUB_PATH`
-        if: success() || failure()
-        run: |
-          nix run nixpkgs#hello
-          nix profile install nixpkgs#hello
-          hello
-          nix store gc
-          nix run nixpkgs#hello
-      - name: Verify the generated nix.conf
-        run: |
-          cat -n /etc/nix/nix.conf
-          grep -E "^trusted-users = .*$USER" /etc/nix/nix.conf
-          grep -E "^use-sqlite-wal = true" /etc/nix/nix.conf
 
-  run-x86_64-darwin:
-    name: Run x86_64 Darwin
-    runs-on: macos-12
-    steps:
-      - uses: actions/checkout@v3
-      - name: Install Nix
-        uses: ./
-        with:
-          logger: pretty
-          log-directives: nix_installer=trace
-          backtrace: full
-      - name: echo $PATH
-        run: echo $PATH
+      - name: Render the devshell
+        if: (success() || failure()) && matrix.runner != 'macos-13-large' && matrix.runner != 'macos-14-large'
+        run: |
+          nix develop --command date
+
       - name: Test `nix` with `$GITHUB_PATH`
         if: success() || failure()
         run: |
@@ -109,6 +90,7 @@ jobs:
           hello
           nix store gc
           nix run nixpkgs#hello
+
       - name: Test bash
         run: nix-instantiate -E 'builtins.currentTime' --eval
         if: success() || failure()
@@ -118,15 +100,16 @@ jobs:
         if: success() || failure()
         shell: sh -l {0}
       - name: Test zsh
-        run: nix-instantiate -E 'builtins.currentTime' --eval
+        run: if (zsh --help > /dev/null); then zsh --login --interactive -c "nix-instantiate -E 'builtins.currentTime' --eval"; fi
         if: success() || failure()
-        shell: zsh --login --interactive {0}
       - name: Install Nix again (noop)
         uses: ./
         with:
           logger: pretty
           log-directives: nix_installer=trace
           backtrace: full
+          _internal-strict-mode: true
+          determinate: ${{ matrix.determinate }}
       - name: Test `nix` with `$GITHUB_PATH`
         if: success() || failure()
         run: |
@@ -144,6 +127,8 @@ jobs:
           reinstall: true
           extra-conf: |
             use-sqlite-wal = true
+          _internal-strict-mode: true
+          determinate: ${{ matrix.determinate }}
       - name: Test `nix` with `$GITHUB_PATH`
         if: success() || failure()
         run: |
@@ -154,6 +139,38 @@ jobs:
           nix run nixpkgs#hello
       - name: Verify the generated nix.conf
         run: |
-          cat /etc/nix/nix.conf
-          grep -E "^trusted-users = .*$USER" /etc/nix/nix.conf
-          grep -E "^use-sqlite-wal = true" /etc/nix/nix.conf
+          nix config show
+          cat -n /etc/nix/nix.conf
+          nix config show | grep -E "^trusted-users = .*$USER"
+          nix config show | grep -E "^use-sqlite-wal = true"
+
+  install-with-non-default-source-inputs:
+    name: Install Nix using non-default source-${{ matrix.inputs.key }}
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        inputs:
+          # https://github.com/DeterminateSystems/nix-installer/blob/v3.11.3
+          - key: url
+            value: https://github.com/DeterminateSystems/nix-installer/releases/download/v3.11.3/nix-installer-x86_64-linux
+            nix-version: "2.31.2" # 3.11.3 is based on 2.31.2
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install with alternative source-${{ matrix.inputs.key }}
+        uses: ./
+        with:
+          source-${{ matrix.inputs.key }}: ${{ matrix.inputs.value }}
+          _internal-strict-mode: true
+      - name: Ensure that the expected Nix version ${{ matrix.inputs.nix-version }} is installed via alternative source-${{ matrix.inputs.key }}
+        run: .github/verify-version.sh ${{ matrix.inputs.nix-version }}
+
+  install-no-id-token:
+    name: Install Nix without an ID token
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./
+        with:
+          _internal-strict-mode: true
+          determinate: true

.prettierrc.json

@@ -1 +1 @@
-{}
+{}

CONTRIBUTING.md

@@ -1,3 +1,5 @@
 # Submitting Pull Requests
 
-This action is based off https://github.com/actions/javascript-action. As part of your contributing flow you **must** run `npm run all` before we can merge.
+Run `pnpm install` to install necessary JS tools.
+
+This action is based off https://github.com/actions/javascript-action. As part of your contributing flow you **must** run `npm run all` before we can merge.

README.md

@@ -5,16 +5,14 @@ The fast, friendly, and reliable GitHub Action to install Nix with Flakes.
 
 ## Supports
 
-* ✅ **Accelerated KVM** on open source projects and larger runners. See [GitHub's announcement](https://github.blog/changelog/2023-02-23-hardware-accelerated-android-virtualization-on-actions-windows-and-linux-larger-hosted-runners/) for more info.
- * ✅ Linux, x86_64, aarch64, and i686
- * ✅ macOS, x86_64 and aarch64
- * ✅ WSL2, x86_64 and aarch64
- * ✅ Containers
- * ✅ Valve's SteamOS
- * ✅ GitHub Enterprise Server
- * ✅ GitHub Hosted, self-hosted, and long running Actions Runners
-
-
+- ✅ **Accelerated KVM** on open source projects and larger runners. See [GitHub's announcement](https://github.blog/changelog/2023-02-23-hardware-accelerated-android-virtualization-on-actions-windows-and-linux-larger-hosted-runners/) for more info.
+- ✅ Linux, x86_64, aarch64, and i686
+- ✅ macOS, x86_64 and aarch64
+- ✅ WSL2, x86_64 and aarch64
+- ✅ Containers
+- ✅ Valve's SteamOS
+- ✅ GitHub Enterprise Server
+- ✅ GitHub Hosted, self-hosted, and long running Actions Runners
 
 ## Usage
 
@@ -29,14 +27,14 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@main
       - run: nix build .
 ```
 
 ### With FlakeHub
 
-To fetch private flakes from FlakeHub, update the `permissions` block and pass `flakehub: true`:
+To fetch private flakes from FlakeHub and Nix builds from FlakeHub Cache, update the `permissions` block and use [`determinate-nix-action`][determinate-nix-action]:
 
 ```yaml
 on:
@@ -52,18 +50,29 @@ jobs:
       id-token: "write"
       contents: "read"
     steps:
-      - uses: actions/checkout@v3
-      - uses: DeterminateSystems/nix-installer-action@main
-        with:
-          flakehub: true
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/determinate-nix-action@v3
       - run: nix build .
 ```
 
 See [`.github/workflows/ci.yml`](.github/workflows/ci.yml) for a full example.
 
+### Pinning the version
+
+This GitHub Action uses the most recent version of the Determinate Nix Installer, even when the Action itself is pinned.
+If you wish to pin your CI workflows to a specific version, use the [`determinate-nix-action`][determinate-nix-action].
+That Action is updated and tagged for every Determinate release.
+
+The `DeterminateSystems/determinate-nix-action@v3.5.2` reference, for example, always installs Determinate Nix v3.5.2.
+
+Additionally, an extra tag on the major version is kept up to date with the current release.
+The `DeterminateSystems/determinate-nix-action@v3` reference, for example, installs the most recent release in the `v3.x.y` series.
+
+If you do tag to a specific version, please [use Dependabot to update your actions][dependabot-actions].
+
 ### Advanced Usage
 
-* If KVM is available, the installer sets up KVM so that Nix can use it ,and exports the `DETERMINATE_NIX_KVM` environment variable set to 1.
+- If KVM is available, the installer sets up KVM so that Nix can use it ,and exports the `DETERMINATE_NIX_KVM` environment variable set to 1.
   If KVM is not available, `DETERMINATE_NIX_KVM` is set to 0.
   This can be used in combination with GitHub Actions' `if` syntax for turning on and off steps.
 
@@ -71,60 +80,62 @@ See [`.github/workflows/ci.yml`](.github/workflows/ci.yml) for a full example.
 
 Differing from the upstream [Nix](https://github.com/NixOS/nix) installer scripts:
 
-* In `nix.conf`:
-  + the `nix-command` and `flakes` features are enabled
-  + `bash-prompt-prefix` is set
-  + `auto-optimise-store` is set to `true` (On Linux only)
+- In `nix.conf`:
+  - the `nix-command` and `flakes` features are enabled
+  - `bash-prompt-prefix` is set
+  - `auto-optimise-store` is set to `true` (On Linux only)
   * `extra-nix-path` is set to `nixpkgs=flake:nixpkgs`
   * `max-jobs` is set to `auto`
-* KVM is enabled by default.
-* an installation receipt (for uninstalling) is stored at `/nix/receipt.json` as well as a copy of the install binary at `/nix/nix-installer`
-* `nix-channel --update` is not run, `~/.nix-channels` is not provisioned
-* `ssl-cert-file` is set in `/etc/nix/nix.conf` if the `ssl-cert-file` argument is used.
-
+- KVM is enabled by default.
+- an installation receipt (for uninstalling) is stored at `/nix/receipt.json` as well as a copy of the install binary at `/nix/nix-installer`
+- `nix-channel --update` is not run, `~/.nix-channels` is not provisioned
+- `ssl-cert-file` is set in `/etc/nix/nix.conf` if the `ssl-cert-file` argument is used.
 
 ## Configuration
 
-| Parameter                | Description                                                                                                                                                                                                                                                                    | Type                                       | Default                                              |
-| :----------------------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :----------------------------------------- | :--------------------------------------------------- |
-| `backtrace`              | The setting for [`RUST_BACKTRACE`][backtrace]                                                                                                                                                                                                                                  | string                                     |                                                      |
-| `extra-args`             | Extra arguments to pass to the planner (prefer using structured `with:` arguments unless using a custom [planner]!)                                                                                                                                                            | string                                     |                                                      |
-| `extra-conf`             | Extra configuration lines for `/etc/nix/nix.conf` (includes `access-tokens` with `secrets.GITHUB_TOKEN` automatically if `github-token` is set)                                                                                                                                | string                                     |                                                      |
-| `flakehub`               | Log in to FlakeHub to pull private flakes using the GitHub Actions [JSON Web Token](https://jwt.io) (JWT), which is bound to the `api.flakehub.com` audience.                                                                                                                  | Boolean                                    | `false`                                              |
-| `force-docker-shim`      | Force the use of Docker as a process supervisor. This setting is automatically enabled when necessary.                                                                                                                                                                         | Boolean                                    | `false`                                              |
-| `github-token`           | A [GitHub token] for making authenticated requests (which have a higher rate-limit quota than unauthenticated requests)                                                                                                                                                        | string                                     | `${{ github.token }}`                                |
-| `github-server-url`      | The URL for the GitHub server, to use with the `github-token` token. Defaults to the current GitHub server, supporting GitHub Enterprise Server automatically. Only change this value if the provided `github-token` is for a different GitHub server than the current server. | string                                     | `${{ github.server }}`                               |
-| `init`                   | The init system to configure (requires `planner: linux-multi`)                                                                                                                                                                                                                 | enum (`none` or `systemd`)                 |                                                      |
-| `kvm`                    | Automatically configure the GitHub Actions Runner for NixOS test support, if the host supports it.                                                                                                                                                                             | Boolean                                    | `true`                                               |
-| `local-root`             | A local `nix-installer` binary root. Overrides the `nix-installer-url` setting (a `nix-installer.sh` should exist, binaries should be named `nix-installer-$ARCH`, eg. `nix-installer-x86_64-linux`).                                                                          | Boolean                                    | `false`                                              |
-| `log-directives`         | A list of [tracing directives], comma separated with `-`s replaced with `_` (eg. `nix_installer=trace`)                                                                                                                                                                        | string                                     |                                                      |
-| `logger`                 | The logger to use during installation                                                                                                                                                                                                                                          | enum (`pretty`, `json`, `full`, `compact`) |                                                      |
-| `mac-case-sensitive`     | Use a case-sensitive volume (`planner: macos` only)                                                                                                                                                                                                                            | Boolean                                    | `false`                                              |
-| `mac-encrypt`            | Force encryption on the volume (`planner: macos` only)                                                                                                                                                                                                                         | Boolean                                    | `false`                                              |
-| `mac-root-disk`          | The root disk of the target (`planner: macos` only)                                                                                                                                                                                                                            | string                                     |                                                      |
-| `mac-volume-label`       | The label for the created [APFS] volume (`planner: macos` only)                                                                                                                                                                                                                | string                                     |                                                      |
-| `modify-profile`         | Modify the user [profile] to automatically load Nix                                                                                                                                                                                                                            | Boolean                                    | `false`                                              |
-| `nix-build-group-id`     | The Nix build group GID                                                                                                                                                                                                                                                        | integer                                    |                                                      |
-| `nix-build-group-name`   | The Nix build group name                                                                                                                                                                                                                                                       | string                                     |                                                      |
-| `nix-build-user-base`    | The Nix build user base UID (ascending)                                                                                                                                                                                                                                        | integer                                    |                                                      |
-| `nix-build-user-count`   | The number of build users to create                                                                                                                                                                                                                                            | integer                                    | 32                                                   |
-| `nix-build-user-prefix`  | The Nix build user prefix (user numbers will be postfixed)                                                                                                                                                                                                                     | string                                     |                                                      |
-| `nix-installer-branch`   | The branch of `nix-installer` to use (conflicts with the `nix-installer-tag`, `nix-installer-revision`, and `nix-installer-branch`)                                                                                                                                            | string                                     |                                                      |
-| `nix-installer-pr`       | The pull request of `nix-installer` to use (conflicts with `nix-installer-tag`, `nix-installer-revision`, and `nix-installer-branch`)                                                                                                                                          | integer                                    |                                                      |
-| `nix-installer-revision` | The revision of `nix-installer` to use (conflicts with `nix-installer-tag`, `nix-installer-branch`, and `nix-installer-pr`)                                                                                                                                                    | string                                     |                                                      |
-| `nix-installer-tag`      | The tag of `nix-installer` to use (conflicts with `nix-installer-revision`, `nix-installer-branch`, `nix-installer-pr`)                                                                                                                                                        | string                                     |                                                      |
-| `nix-installer-url`      | A URL pointing to a `nix-installer.sh` script                                                                                                                                                                                                                                  | URL                                        | `https://install.determinate.systems/nix`            |
-| `nix-package-url`        | The Nix package URL                                                                                                                                                                                                                                                            | URL                                        |                                                      |
-| `planner`                | The installation [planner] to use                                                                                                                                                                                                                                              | enum (`linux` or `macos`)                  |                                                      |
-| `reinstall`              | Force a reinstall if an existing installation is detected (consider backing up `/nix/store`)                                                                                                                                                                                   | Boolean                                    | `false`                                              |
-| `start-daemon`           | If the daemon should be started, requires `planner: linux-multi`                                                                                                                                                                                                               | Boolean                                    | `false`                                              |
-| `trust-runner-user`      | Whether to make the runner user trusted by the Nix daemon                                                                                                                                                                                                                      | Boolean                                    | `true`                                               |
-| `diagnostic-endpoint`    | Diagnostic endpoint url where the installer sends install [diagnostic reports](https://github.com/DeterminateSystems/nix-installer#diagnostics) to, to disable set this to an empty string                                                                                     | string                                     | `https://install.determinate.systems/nix/diagnostic` |
-| `proxy`                  | The proxy to use (if any), valid proxy bases are `https://$URL`, `http://$URL` and `socks5://$URL`                                                                                                                                                                             | string                                     |                                                      |
-| `ssl-cert-file`          | An SSL cert to use (if any), used for fetching Nix and sets `NIX_SSL_CERT_FILE` for Nix                                                                                                                                                                                        | string                                     |                                                      |
+| Parameter               | Description                                                                                                                                                                                                                                                                    | Type                                       | Default                                                        |
+| :---------------------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :----------------------------------------- | :------------------------------------------------------------- |
+| `backtrace`             | The setting for [`RUST_BACKTRACE`][backtrace]                                                                                                                                                                                                                                  | string                                     |                                                                |
+| `determinate`           | Whether to install [Determinate Nix](https://determinate.systems/enterprise) and log in to FlakeHub for private Flakes and binary caches.                                                                                                                                      | Boolean                                    | `true`                                                         |
+| `extra-args`            | Extra arguments to pass to the planner (prefer using structured `with:` arguments unless using a custom [planner]!)                                                                                                                                                            | string                                     |                                                                |
+| `extra-conf`            | Extra configuration lines for `/etc/nix/nix.conf` (includes `access-tokens` with `secrets.GITHUB_TOKEN` automatically if `github-token` is set)                                                                                                                                | string                                     |                                                                |
+| `flakehub`              | Deprecated. Implies `determinate`.                                                                                                                                                                                                                                             | Boolean                                    | `false`                                                        |
+| `force-no-systemd`      | Force using other methods than systemd to launch the daemon. This setting is automatically enabled when necessary.                                                                                                                                                             | Boolean                                    | `false`                                                        |
+| `github-token`          | A [GitHub token] for making authenticated requests (which have a higher rate-limit quota than unauthenticated requests)                                                                                                                                                        | string                                     | `${{ github.token }}`                                          |
+| `github-server-url`     | The URL for the GitHub server, to use with the `github-token` token. Defaults to the current GitHub server, supporting GitHub Enterprise Server automatically. Only change this value if the provided `github-token` is for a different GitHub server than the current server. | string                                     | `${{ github.server }}`                                         |
+| `init`                  | The init system to configure (requires `planner: linux-multi`)                                                                                                                                                                                                                 | enum (`none` or `systemd`)                 |                                                                |
+| `kvm`                   | Automatically configure the GitHub Actions Runner for NixOS test support, if the host supports it.                                                                                                                                                                             | Boolean                                    | `true`                                                         |
+| `local-root`            | A local `nix-installer` binary root. Overrides the `nix-installer-url` setting (a `nix-installer.sh` should exist, binaries should be named `nix-installer-$ARCH`, eg. `nix-installer-x86_64-linux`).                                                                          | Boolean                                    | `false`                                                        |
+| `log-directives`        | A list of [tracing directives], comma separated with `-`s replaced with `_` (eg. `nix_installer=trace`)                                                                                                                                                                        | string                                     |                                                                |
+| `logger`                | The logger to use during installation                                                                                                                                                                                                                                          | enum (`pretty`, `json`, `full`, `compact`) |                                                                |
+| `mac-case-sensitive`    | Use a case-sensitive volume (`planner: macos` only)                                                                                                                                                                                                                            | Boolean                                    | `false`                                                        |
+| `mac-encrypt`           | Force encryption on the volume (`planner: macos` only)                                                                                                                                                                                                                         | Boolean                                    | `false`                                                        |
+| `mac-root-disk`         | The root disk of the target (`planner: macos` only)                                                                                                                                                                                                                            | string                                     |                                                                |
+| `mac-volume-label`      | The label for the created [APFS] volume (`planner: macos` only)                                                                                                                                                                                                                | string                                     |                                                                |
+| `modify-profile`        | Modify the user [profile] to automatically load Nix                                                                                                                                                                                                                            | Boolean                                    | `false`                                                        |
+| `nix-build-group-id`    | The Nix build group GID                                                                                                                                                                                                                                                        | integer                                    |                                                                |
+| `nix-build-group-name`  | The Nix build group name                                                                                                                                                                                                                                                       | string                                     |                                                                |
+| `nix-build-user-base`   | The Nix build user base UID (ascending)                                                                                                                                                                                                                                        | integer                                    |                                                                |
+| `nix-build-user-count`  | The number of build users to create                                                                                                                                                                                                                                            | integer                                    | 32                                                             |
+| `nix-build-user-prefix` | The Nix build user prefix (user numbers will be postfixed)                                                                                                                                                                                                                     | string                                     |                                                                |
+| `source-branch`         | The branch of `nix-installer` to use (conflicts with the `source-tag`, `source-revision`, and `source-branch`)                                                                                                                                                                 | string                                     |                                                                |
+| `source-pr`             | The pull request of `nix-installer` to use (conflicts with `source-tag`, `source-revision`, and `source-branch`)                                                                                                                                                               | integer                                    |                                                                |
+| `source-revision`       | The revision of `nix-installer` to use (conflicts with `source-tag`, `source-branch`, and `source-pr`)                                                                                                                                                                         | string                                     |                                                                |
+| `source-tag`            | The tag of `nix-installer` to use (conflicts with `source-revision`, `source-branch`, `source-pr`)                                                                                                                                                                             | string                                     |                                                                |
+| `source-url`            | A URL pointing to the `nix-installer` binary                                                                                                                                                                                                                                   | URL                                        | n/a (calculated)                                               |
+| `nix-package-url`       | The Nix package URL                                                                                                                                                                                                                                                            | URL                                        |                                                                |
+| `planner`               | The installation [planner] to use                                                                                                                                                                                                                                              | enum (`linux` or `macos`)                  |                                                                |
+| `reinstall`             | Force a reinstall if an existing installation is detected (consider backing up `/nix/store`)                                                                                                                                                                                   | Boolean                                    | `false`                                                        |
+| `start-daemon`          | If the daemon should be started, requires `planner: linux-multi`                                                                                                                                                                                                               | Boolean                                    | `false`                                                        |
+| `trust-runner-user`     | Whether to make the runner user trusted by the Nix daemon                                                                                                                                                                                                                      | Boolean                                    | `true`                                                         |
+| `diagnostic-endpoint`   | Diagnostic endpoint url where the installer sends install [diagnostic reports](https://github.com/DeterminateSystems/nix-installer#diagnostics) to, to disable set this to an empty string                                                                                     | string                                     | `https://install.determinate.systems/nix-installer/diagnostic` |
+| `proxy`                 | The proxy to use (if any), valid proxy bases are `https://$URL`, `http://$URL` and `socks5://$URL`                                                                                                                                                                             | string                                     |                                                                |
+| `ssl-cert-file`         | An SSL cert to use (if any), used for fetching Nix and sets `NIX_SSL_CERT_FILE` for Nix                                                                                                                                                                                        | string                                     |                                                                |
 
 [apfs]: https://en.wikipedia.org/wiki/Apple_File_System
 [backtrace]: https://doc.rust-lang.org/std/backtrace/index.html#environment-variables
+[dependabot-actions]: https://github.com/DeterminateSystems/determinate-nix-action?tab=readme-ov-file#-automate-updates-with-dependabot
+[determinate-nix-action]: https://github.com/DeterminateSystems/determinate-nix-action
 [github token]: https://docs.github.com/en/actions/security-guides/automatic-token-authentication
 [planner]: https://github.com/determinateSystems/nix-installer#usage
 [profile]: https://nixos.org/manual/nix/stable/package-management/profiles

action.yml

@@ -7,6 +7,10 @@ inputs:
   backtrace:
     description: The setting for `RUST_BACKTRACE` (see https://doc.rust-lang.org/std/backtrace/index.html#environment-variables)
     required: false
+  determinate:
+    description: |
+      Whether to install [Determinate Nix](https://determinate.systems/enterprise) and log in to FlakeHub for private Flakes and binary caches.
+    default: true
   extra-args:
     description: Extra args to pass to the planner (prefer using structured `with:` arguments unless using a custom planner!)
     required: false
@@ -14,11 +18,12 @@ inputs:
     description: Extra configuration lines for `/etc/nix/nix.conf` (includes `access-tokens` with `secrets.GITHUB_TOKEN` automatically if `github-token` is set)
     required: false
   flakehub:
-    description: Automatically log in to your [FlakeHub](https://flakehub.com) account, for accessing private flakes.
+    description: Deprecated. Implies `determinate`.
     required: false
     default: false
-  force-docker-shim:
-    description: Force the use of Docker as a process supervisor. This setting is automatically enabled when necessary.
+  force-no-systemd:
+    description: Force using other methods than systemd to launch the daemon. This setting is automatically enabled when necessary.
+    required: false
     default: false
   github-token:
     description: A GitHub token for making authenticated requests (which have a higher rate-limit quota than unauthenticated requests)
@@ -29,6 +34,9 @@ inputs:
   init:
     description: "The init system to configure, requires `planner: linux-multi` (allowing the choice between `none` or `systemd`)"
     required: false
+  job-status:
+    description: The overall status of the job. Set automatically, for aggregate analysis of Nix stability.
+    default: ${{ job.status }}
   kvm:
     description: Automatically configure the GitHub Actions Runner for NixOS test supports, if the host supports it.
     required: false
@@ -79,20 +87,23 @@ inputs:
   nix-build-user-prefix:
     description: The Nix build user prefix (user numbers will be postfixed)
     required: false
-  nix-installer-branch:
-    description: The branch of `nix-installer` to use (conflicts with `nix-installer-tag`, `nix-installer-revision`, `nix-installer-pr`)
+  source-binary:
+    description: Run a version of the nix-installer binary from somewhere already on disk. Conflicts with all other `source-*` options. Intended only for testing this Action.
     required: false
-  nix-installer-pr:
-    description: The PR of `nix-installer` to use (conflicts with `nix-installer-tag`, `nix-installer-revision`, `nix-installer-branch`)
+  source-branch:
+    description: The branch of `nix-installer` to use (conflicts with `source-tag`, `source-revision`, `source-pr`)
     required: false
-  nix-installer-revision:
-    description: The revision of `nix-installer` to use (conflicts with `nix-installer-tag`, `nix-installer-branch`, `nix-installer-pr`)
+  source-pr:
+    description: The PR of `nix-installer` to use (conflicts with `source-tag`, `source-revision`, `source-branch`)
     required: false
-  nix-installer-tag:
-    description: The tag of `nix-installer` to use (conflicts with `nix-installer-revision`, `nix-installer-branch`, `nix-installer-pr`)
+  source-revision:
+    description: The revision of `nix-installer` to use (conflicts with `source-tag`, `source-branch`, `source-pr`)
     required: false
-  nix-installer-url:
-    description: A URL pointing to a `nix-installer.sh` script
+  source-tag:
+    description: The tag of `nix-installer` to use (conflicts with `source-revision`, `source-branch`, `source-pr`)
+    required: false
+  source-url:
+    description: A URL pointing to a `nix-installer` executable
     required: false
   nix-package-url:
     description: The Nix package URL
@@ -110,12 +121,32 @@ inputs:
     default: true
   diagnostic-endpoint:
     description: "Diagnostic endpoint url where the installer sends data to. To disable set this to an empty string."
-    default: "https://install.determinate.systems/nix/diagnostic"
+    required: false
+    default: "-"
   trust-runner-user:
     description: Whether to make the runner user trusted by the Nix daemon
-    default: "true"
+    default: true
+  nix-installer-branch:
+    description: (deprecated) The branch of `nix-installer` to use (conflicts with `nix-installer-tag`, `nix-installer-revision`, `nix-installer-pr`)
+    required: false
+  nix-installer-pr:
+    description: (deprecated) The PR of `nix-installer` to use (conflicts with `nix-installer-tag`, `nix-installer-revision`, `nix-installer-branch`)
+    required: false
+  nix-installer-revision:
+    description: (deprecated) The revision of `nix-installer` to use (conflicts with `nix-installer-tag`, `nix-installer-branch`, `nix-installer-pr`)
+    required: false
+  nix-installer-tag:
+    description: (deprecated) The tag of `nix-installer` to use (conflicts with `nix-installer-revision`, `nix-installer-branch`, `nix-installer-pr`)
+    required: false
+  nix-installer-url:
+    description: (deprecated) A URL pointing to a `nix-installer.sh` script
+    required: false
+  _internal-strict-mode:
+    description: Whether to fail when any errors are thrown. Used only to test the Action; do not set this in your own workflows.
+    required: false
+    default: false
 
 runs:
   using: "node20"
-  main: 'dist/index.js'
-  post: 'dist/index.js'
+  main: "dist/index.js"
+  post: "dist/index.js"

dist/index.d.ts

@@ -0,0 +1,2 @@
+
+export {  }

dist/licenses.txt

@@ -1,775 +0,0 @@
-@actions/core
-MIT
-The MIT License (MIT)
-
-Copyright 2019 GitHub
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-@actions/exec
-MIT
-The MIT License (MIT)
-
-Copyright 2019 GitHub
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-@actions/github
-MIT
-The MIT License (MIT)
-
-Copyright 2019 GitHub
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-@actions/http-client
-MIT
-Actions Http Client for Node.js
-
-Copyright (c) GitHub, Inc.
-
-All rights reserved.
-
-MIT License
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
-associated documentation files (the "Software"), to deal in the Software without restriction,
-including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
-and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
-subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
-LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
-WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-
-@actions/io
-MIT
-The MIT License (MIT)
-
-Copyright 2019 GitHub
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-@actions/tool-cache
-MIT
-The MIT License (MIT)
-
-Copyright 2019 GitHub
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-@octokit/auth-token
-MIT
-The MIT License
-
-Copyright (c) 2019 Octokit contributors
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-
-
-@octokit/core
-MIT
-The MIT License
-
-Copyright (c) 2019 Octokit contributors
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-
-
-@octokit/endpoint
-MIT
-The MIT License
-
-Copyright (c) 2018 Octokit contributors
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-
-
-@octokit/graphql
-MIT
-The MIT License
-
-Copyright (c) 2018 Octokit contributors
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-
-
-@octokit/plugin-paginate-rest
-MIT
-MIT License Copyright (c) 2019 Octokit contributors
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice (including the next paragraph) shall be included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-
-@octokit/plugin-rest-endpoint-methods
-MIT
-MIT License Copyright (c) 2019 Octokit contributors
-
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dist/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

docker-shim/Dockerfile

@@ -1,19 +0,0 @@
-# Determinate Nix Installer: Docker Shim
-#
-# This empty image exists to lean on Docker as a process supervisor when
-# systemd isn't available. Specifically intended for self-hosted GitHub
-# Actions runners using Docker-in-Docker.
-#
-# See: https://github.com/DeterminateSystems/nix-installer-action 
-
-FROM scratch
-
-ENTRYPOINT [ "/nix/var/nix/profiles/default/bin/nix-daemon"]
-CMD []
-
-HEALTHCHECK \
-    --interval=5m \
-    --timeout=3s \
-    CMD ["/nix/var/nix/profiles/default/bin/nix", "store", "ping", "--store", "daemon"]
-
-COPY ./Dockerfile /README.md

docker-shim/README.md

@@ -1,52 +0,0 @@
-# Determinate Nix Installer Action: Docker Shim
-
-The image in this repository is a product of the contained Dockerfile.
-It is an otherwise empty image with a configuration layer.
-
-This image is to be used in GitHub Actions runners which don't have systemd available, like self-hosted ARC runners.
-
-The image would have no layers / content at all, however Docker has a bug and refuses to export those images.
-This isn't a technical limitation preventing us from creating and distributing that image, but an ease-of-use limitation.
-Since some of Docker's inspection tools break on an empty image, the image contains a single layer containing a README.
-
-To build:
-
-```shell
-docker build . --tag determinate-nix-shim:latest
-docker image save determinate-nix-shim:latest | gzip --best > amd64.tar
-```
-
-Then, extract the tarball:
-
-```
-mkdir extract
-cd extract
-tar -xf ../amd64.tar
-```
-
-It'll look like this, though the hashes will be different.
-
-```
-.
-├── 771204abb853cdde06bbbc680001a02642050a1db1a7b0a48cf5f20efa8bdc5d.json
-├── c4088111818e553e834adfc81bda8fe6da281afa9a40012eaa82796fb5476e98
-│   ├── VERSION
-│   ├── json
-│   └── layer.tar
-├── manifest.json
-└── repositories
-```
-
-Ignore `manifest.json`, and edit the other two JSON documents to replace `amd64` with `arm64`, both in a key named "architecture:
-
-```
-"architecture":"amd64"
-```
-
-Then re-create the tar, from within the `extract` directory:
-
-```
-tar --options gzip:compression-level=9 -zcf ../arm64.tar.gz .
-```
-
-Then `git add` the two .tar.gz's and you're done.

flake.nix

@@ -9,7 +9,7 @@
 
   outputs = { self, flake-schemas, nixpkgs }:
     let
-      supportedSystems = [ "x86_64-linux" "aarch64-darwin" ];
+      supportedSystems = [ "x86_64-linux" "aarch64-darwin" "aarch64-linux" ];
       forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
         pkgs = import nixpkgs { inherit system; };
       });
@@ -22,6 +22,8 @@
           packages = with pkgs; [
             nodejs_latest
             nixpkgs-fmt
+            nodePackages_latest.pnpm
+            nodePackages_latest.typescript-language-server
           ];
         };
       });

package.json

@@ -1,14 +1,18 @@
 {
   "name": "nix-installer-action",
   "version": "1.0.0",
-  "description": "You can use [`nix-installer`](https://github.com/DeterminateSystems/nix-installer) as a Github action:",
-  "main": "lib/main.js",
+  "description": "You can use [`nix-installer`](https://github.com/DeterminateSystems/nix-installer) as a Github Action:",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "type": "module",
   "scripts": {
-    "build": "tsc",
-    "format": "prettier --write '**/*.ts'",
+    "build": "tsup",
+    "format": "prettier --write .",
+    "check-fmt": "prettier --check .",
     "lint": "eslint src/**/*.ts",
-    "package": "ncc build --source-map --license licenses.txt",
-    "all": "npm run build && npm run format && npm run lint && npm run package"
+    "package": "ncc build",
+    "test": "vitest --watch false",
+    "all": "pnpm run test && pnpm run format && pnpm run lint && pnpm run build && pnpm run package"
   },
   "repository": {
     "type": "git",
@@ -22,22 +26,27 @@
   },
   "homepage": "https://github.com/DeterminateSystems/nix-installer-action#readme",
   "dependencies": {
-    "@actions/core": "^1.10.0",
+    "@actions/core": "^1.11.1",
     "@actions/exec": "^1.1.1",
-    "@actions/github": "^5.1.1",
-    "@actions/tool-cache": "^2.0.1",
-    "fetch-retry": "^5.0.6",
-    "string-argv": "^0.3.2"
+    "@actions/github": "^6.0.1",
+    "detsys-ts": "github:DeterminateSystems/detsys-ts",
+    "got": "^14.6.2",
+    "string-argv": "^0.3.2",
+    "vitest": "^3.2.4"
   },
   "devDependencies": {
-    "@types/node": "^18.16.3",
-    "@typescript-eslint/parser": "^5.59.2",
-    "@vercel/ncc": "^0.36.1",
-    "eslint": "^8.44.0",
-    "eslint-plugin-github": "^4.3.6",
-    "eslint-plugin-import": "^2.26.0",
-    "eslint-plugin-prettier": "^5.0.0-alpha.1",
-    "prettier": "^3.0.0",
-    "typescript": "^5.1.6"
+    "@trivago/prettier-plugin-sort-imports": "^4.3.0",
+    "@types/node": "^20.19.24",
+    "@types/uuid": "^9.0.8",
+    "@typescript-eslint/eslint-plugin": "^7.18.0",
+    "@vercel/ncc": "^0.38.4",
+    "eslint": "^8.57.1",
+    "eslint-import-resolver-typescript": "^3.10.1",
+    "eslint-plugin-github": "^4.10.2",
+    "eslint-plugin-import": "^2.32.0",
+    "eslint-plugin-prettier": "^5.5.4",
+    "prettier": "^3.6.2",
+    "tsup": "^8.5.0",
+    "typescript": "^5.9.3"
   }
 }

src/annotate.ts

@@ -0,0 +1,66 @@
+import * as core from "@actions/core";
+
+import type { Fix, FixHashesOutputV1, Mismatch } from "./fixHashes.js";
+
+function prettyDerivation(derivation: string): string {
+  return derivation.replace(/\/nix\/store\/\w+-/, "").replace(/.drv$/, "");
+}
+
+function annotateSingle(
+  file: string,
+  line: number,
+  { derivation, replacement }: Mismatch,
+): void {
+  const pretty = prettyDerivation(derivation);
+  core.error(`To correct the hash mismatch for ${pretty}, use ${replacement}`, {
+    file,
+    startLine: line,
+  });
+}
+
+function annotateMultiple(
+  file: string,
+  { line, found, mismatches }: Fix,
+): void {
+  const matches = mismatches
+    .map(({ derivation, replacement }) => {
+      const pretty = prettyDerivation(derivation);
+      return `* For the derivation ${pretty}, use ${replacement}`;
+    })
+    .join("\n");
+
+  core.error(
+    `There are multiple replacements for the expression ${found}:\n${matches}`,
+    {
+      file,
+      startLine: line,
+    },
+  );
+}
+
+function annotate(file: string, fix: Fix): void {
+  if (fix.mismatches.length === 1) {
+    annotateSingle(file, fix.line, fix.mismatches[0]);
+  } else {
+    annotateMultiple(file, fix);
+  }
+}
+
+/**
+ * Annotates fixed-output derivation hash mismatches using GitHub Actions'
+ *
+ * @param output The output of `determinate-nixd fix hashes --json`
+ * @returns The number of annotations reported to the user
+ */
+export function annotateMismatches(output: FixHashesOutputV1): number {
+  let count = 0;
+
+  for (const { file, fixes } of output.files) {
+    for (const fix of fixes) {
+      annotate(file, fix);
+      count++;
+    }
+  }
+
+  return count;
+}

src/events.test.ts

@@ -0,0 +1,65 @@
+import { parseEvents, getRecentEvents } from "./events.js";
+import { expect, test } from "vitest";
+
+// Handy test for locally making sure you can fetch recent events:
+// eslint-disable-next-line no-constant-condition
+if (false) {
+  test("Parsing existing events", async () => {
+    expect(await getRecentEvents(new Date(Date.now() - 1000000))).toStrictEqual(
+      [{}],
+    );
+  });
+}
+
+test("Parsing existing events", () => {
+  const { events } = parseEvents([
+    {
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: "/nix/store/m96zgji4fhi70s2zs6pq5pric6ch7p4h-stdenv-darwin.drv",
+      outputs: ["/nix/store/dalhfz3l75w4b4q06sxzqgb2wfydvkbv-stdenv-darwin"],
+      timing: null,
+    },
+    {
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: "/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv",
+      outputs: ["/nix/store/qwlgz5da3pfb53gqpgdmazaj9jczrnly-dep-1"],
+      timing: {
+        startTime: "2025-04-11T14:38:02Z",
+        stopTime: "2025-04-11T14:38:05Z",
+        durationSeconds: 3,
+      },
+    },
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: "/nix/store/ykvbksjqrza2zpj6nkbycrdfwgfdpr8g-hash-mismatch-md5-base16.drv",
+      timing: {
+        startTime: "2025-04-11T14:36:44Z",
+        stopTime: "2025-04-11T14:36:44Z",
+        durationSeconds: 0,
+      },
+    },
+  ]);
+  expect(events).toStrictEqual([
+    {
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: "/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv",
+      timing: {
+        durationSeconds: 3,
+        startTime: new Date("2025-04-11T14:38:02Z"),
+      },
+    },
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: "/nix/store/ykvbksjqrza2zpj6nkbycrdfwgfdpr8g-hash-mismatch-md5-base16.drv",
+      timing: {
+        durationSeconds: 0,
+        startTime: new Date("2025-04-11T14:36:44Z"),
+      },
+    },
+  ]);
+});

src/events.ts

@@ -0,0 +1,89 @@
+import got from "got";
+
+export interface DEvent {
+  v: string;
+  c: string;
+  drv: string;
+  timing: {
+    startTime: Date;
+    durationSeconds: number;
+  };
+}
+
+export interface ParsedEventsResult {
+  readonly events: DEvent[];
+  readonly hasMismatches: boolean;
+}
+
+export function parseEvents(data: unknown): ParsedEventsResult {
+  let hasMismatches = false;
+
+  if (!Array.isArray(data)) {
+    return { events: [], hasMismatches };
+  }
+
+  const events = data.flatMap((event) => {
+    // If this was a hash mismatch event, note it and move on
+    if (event.v === "1" && event.c === "HashMismatchResponseEventV1") {
+      hasMismatches = true;
+      return [];
+    }
+
+    // Otherwise, determine if it's an event we're interested in
+    if (
+      event.v === "1" &&
+      (event.c === "BuildFailureResponseEventV1" ||
+        event.c === "BuiltPathResponseEventV1") &&
+      Object.hasOwn(event, "drv") &&
+      typeof event.drv === "string" &&
+      Object.hasOwn(event, "timing") &&
+      typeof event.timing === "object" &&
+      event.timing !== null
+    ) {
+      const timing = event.timing as { [key: string]: unknown };
+
+      if (
+        Object.hasOwn(timing, "startTime") &&
+        typeof timing.startTime === "string" &&
+        Object.hasOwn(timing, "durationSeconds") &&
+        typeof timing.durationSeconds === "number"
+      ) {
+        const date = Date.parse(timing.startTime);
+        if (!Number.isNaN(date)) {
+          return [
+            {
+              v: event.v,
+              c: event.c,
+              drv: event.drv,
+              timing: {
+                startTime: new Date(date),
+                durationSeconds: timing.durationSeconds,
+              },
+            },
+          ];
+        }
+      }
+    }
+
+    return [];
+  });
+
+  return { events, hasMismatches };
+}
+
+export async function getRecentEvents(
+  since: Date,
+): Promise<ParsedEventsResult> {
+  const queryParam = encodeURIComponent(since.toISOString());
+
+  const resp = await got
+    .get(
+      `http://unix:/nix/var/determinate/determinate-nixd.socket:/events/recent?since=${queryParam}`,
+      {
+        enableUnixSockets: true,
+      },
+    )
+    .json();
+
+  return parseEvents(resp);
+}

src/failuresummary.test.ts

@@ -0,0 +1,275 @@
+import { expect, test } from "vitest";
+import {
+  FailureSummary,
+  getBuildFailures,
+  summarizeFailures,
+} from "./failuresummary.js";
+
+/* eslint-disable @typescript-eslint/no-non-null-assertion */
+
+test("Select for failure events", () => {
+  const events = [
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv`,
+      timing: {
+        startTime: new Date(1 * 1000),
+        durationSeconds: 1,
+      },
+    },
+    {
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-2.drv`,
+      timing: {
+        startTime: new Date(2 * 1000),
+        durationSeconds: 2,
+      },
+    },
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv`,
+      timing: {
+        startTime: new Date(3 * 1000),
+        durationSeconds: 3,
+      },
+    },
+  ];
+
+  expect(getBuildFailures(events)).toStrictEqual([
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv`,
+      timing: {
+        startTime: new Date(1 * 1000),
+        durationSeconds: 1,
+      },
+    },
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv`,
+      timing: {
+        startTime: new Date(3 * 1000),
+        durationSeconds: 3,
+      },
+    },
+  ]);
+});
+
+test("Summarize Failures", async () => {
+  const events = [
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv`,
+      timing: {
+        startTime: new Date(1 * 1000),
+        durationSeconds: 1,
+      },
+    },
+    {
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-2.drv`,
+      timing: {
+        startTime: new Date(2 * 1000),
+        durationSeconds: 2,
+      },
+    },
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv`,
+      timing: {
+        startTime: new Date(3 * 1000),
+        durationSeconds: 3,
+      },
+    },
+  ];
+
+  const logMaker = async (drv: string): Promise<string | undefined> => {
+    if (drv.includes("dep-1")) {
+      return `${drv}\n`.repeat(9).trimEnd();
+    } else {
+      return `${drv}\n`.repeat(25).trimEnd();
+    }
+  };
+
+  const summary: FailureSummary = (await summarizeFailures(events, logMaker))!;
+
+  expect(summary.markdownLines.join("\n"))
+    .toStrictEqual(`### Build error review :boom:
+> [!NOTE]
+> 2 builds failed
+<details><summary>Failure log: <code>/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-<strong>dep-1</strong>.drv</code></summary>
+
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+
+</details>
+
+<details><summary>Failure log: <code>/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-<strong>dep-3</strong>.drv</code></summary>
+
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+
+</details>
+`);
+
+  expect(summary.logLines.join("\n"))
+    .toStrictEqual(`\u001b[38;2;255;0;0mBuild logs from 2 failures
+The following build logs are also available in the Markdown summary:
+::group::Failed build: /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+::endgroup::
+::group::Failed build: /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+::endgroup::`);
+});
+
+test("Omit some logs if there are too many", async () => {
+  const events = [
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv`,
+      timing: {
+        startTime: new Date(1 * 1000),
+        durationSeconds: 1,
+      },
+    },
+    {
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-2.drv`,
+      timing: {
+        startTime: new Date(2 * 1000),
+        durationSeconds: 2,
+      },
+    },
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv`,
+      timing: {
+        startTime: new Date(3 * 1000),
+        durationSeconds: 3,
+      },
+    },
+  ];
+
+  const logMaker = async (drv: string): Promise<string | undefined> => {
+    return `${drv}\n`.repeat(5).trimEnd();
+  };
+
+  const summary: FailureSummary = (await summarizeFailures(
+    events,
+    logMaker,
+    500,
+  ))!;
+
+  expect(summary.markdownLines.join("\n"))
+    .toStrictEqual(`### Build error review :boom:
+> [!NOTE]
+> 2 builds failed
+<details><summary>Failure log: <code>/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-<strong>dep-1</strong>.drv</code></summary>
+
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+
+</details>
+
+
+> [!NOTE]
+> The following failure has been omitted due to GitHub Actions' summary length limitations.
+> The full logs are available in the post-run phase of the Nix Installer Action.
+> * \`/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv\``);
+
+  expect(summary.logLines.join("\n"))
+    .toStrictEqual(`\u001b[38;2;255;0;0mBuild logs from 2 failures
+The following build logs are also available in the Markdown summary:
+::group::Failed build: /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv
+::endgroup::
+The following build logs are NOT available in the Markdown summary:
+::group::Failed build: /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+    /nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-3.drv
+::endgroup::`);
+});

src/failuresummary.ts

@@ -0,0 +1,124 @@
+import { getExecOutput } from "@actions/exec";
+import { DEvent } from "./events.js";
+import { stripVTControlCharacters } from "node:util";
+
+// CI summaries have a max length of "1024k" which I assume to be 1048576 bytes.
+// Generously, the mermaid doc is about 50,000 bytes.
+// Rounding it all down a bit further for wiggle room, that leaves lots of log space.
+const defaultMaxSummaryLength = 995_000;
+
+export function getBuildFailures(events: DEvent[]): DEvent[] {
+  return events.filter((event: DEvent): Boolean => {
+    return event.c === "BuildFailureResponseEventV1";
+  });
+}
+
+export interface FailureSummary {
+  logLines: string[];
+  markdownLines: string[];
+}
+
+export async function summarizeFailures(
+  events: DEvent[],
+  getLog: (drv: string) => Promise<string | undefined> = getLogFromNix,
+  maxLength: number = defaultMaxSummaryLength,
+): Promise<FailureSummary | undefined> {
+  const failures = getBuildFailures(events);
+
+  if (failures.length === 0) {
+    return undefined;
+  }
+
+  const logLines = [];
+  const markdownLines = [];
+
+  logLines.push(
+    `\u001b[38;2;255;0;0mBuild logs from ${failures.length} failure${failures.length === 1 ? "" : "s"}`,
+  );
+  logLines.push(
+    `The following build logs are also available in the Markdown summary:`,
+  );
+  markdownLines.push(`### Build error review :boom:`);
+  markdownLines.push("> [!NOTE]");
+  markdownLines.push(
+    `> ${failures.length} build${failures.length === 1 ? "" : "s"} failed`,
+  );
+
+  const markdownLogChunks: {
+    drv: string;
+    txtLines: string[];
+    mdLines: string[];
+  }[] = [];
+  for (const event of failures) {
+    const markdownLogChunk = [];
+    const txtLogChunk = [];
+    txtLogChunk.push(`::group::Failed build: ${event.drv}`);
+
+    const log =
+      (await getLog(event.drv)) ??
+      "(failure reading the log for this derivation.)";
+    const indented = log.split("\n").map((line) => `    ${line}`);
+
+    markdownLogChunk.push(
+      `<details><summary>Failure log: <code>${event.drv.replace(/^(\/nix[^-]*-)(.*)(\.drv)$/, "$1<strong>$2</strong>$3")}</code></summary>`,
+    );
+    markdownLogChunk.push("");
+
+    for (const line of indented) {
+      txtLogChunk.push(line);
+      markdownLogChunk.push(stripVTControlCharacters(line));
+    }
+    markdownLogChunk.push("");
+    markdownLogChunk.push("</details>");
+    markdownLogChunk.push("");
+
+    markdownLogChunks.push({
+      drv: event.drv,
+      mdLines: markdownLogChunk,
+      txtLines: txtLogChunk,
+    });
+    txtLogChunk.push(`::endgroup::`);
+  }
+
+  const skippedChunks = [];
+
+  // Add markdown log chunks until we exceed the max length
+  let markdownLength = markdownLines.join("\n").length;
+  for (const chunk of markdownLogChunks) {
+    const chunkLength = chunk.mdLines.join("\n").length;
+    if (markdownLength + chunkLength > maxLength) {
+      skippedChunks.push(chunk);
+    } else {
+      logLines.push(...chunk.txtLines);
+      markdownLines.push(...chunk.mdLines);
+      markdownLength += chunkLength;
+    }
+  }
+
+  if (skippedChunks.length > 0) {
+    markdownLines.push(
+      "",
+      "> [!NOTE]",
+      `> The following ${skippedChunks.length === 1 ? "failure has" : "failures have"} been omitted due to GitHub Actions' summary length limitations.`,
+      "> The full logs are available in the post-run phase of the Nix Installer Action.",
+    );
+
+    logLines.push(
+      "The following build logs are NOT available in the Markdown summary:",
+    );
+    for (const chunk of skippedChunks) {
+      markdownLines.push(`> * \`${chunk.drv}\``);
+      logLines.push(...chunk.txtLines);
+    }
+  }
+
+  return { logLines, markdownLines };
+}
+
+async function getLogFromNix(drv: string): Promise<string | undefined> {
+  const output = await getExecOutput("nix", ["log", drv], {
+    silent: true,
+  });
+
+  return output.stdout;
+}

src/fixHashes.ts

@@ -0,0 +1,38 @@
+import { getExecOutput } from "@actions/exec";
+
+export interface Mismatch {
+  readonly derivation: string;
+  readonly replacement: string;
+}
+
+export interface Fix {
+  readonly line: number;
+  readonly found: string;
+  readonly mismatches: readonly Mismatch[];
+}
+
+export interface FileFix {
+  readonly file: string;
+  readonly fixes: readonly Fix[];
+}
+
+export interface FixHashesOutputV1 {
+  readonly version: "v1";
+  readonly files: readonly FileFix[];
+}
+
+export async function getFixHashes(since: string): Promise<FixHashesOutputV1> {
+  const output = await getExecOutput(
+    "determinate-nixd",
+    ["fix", "hashes", "--json", "--since", since],
+    { silent: true },
+  );
+
+  if (output.exitCode !== 0) {
+    throw new Error(
+      `determinate-nixd fix hashes returned non-zero exit code ${output.exitCode} with the following error output:\n${output.stderr}`,
+    );
+  }
+
+  return JSON.parse(output.stdout);
+}

src/main.ts

@@ -1,957 +0,0 @@
-import * as actions_core from "@actions/core";
-import * as github from "@actions/github";
-import * as actions_tool_cache from "@actions/tool-cache";
-import * as actions_exec from "@actions/exec";
-import { chmod, access, writeFile } from "node:fs/promises";
-import { randomUUID } from "node:crypto";
-import { join } from "node:path";
-import fs from "node:fs";
-import { userInfo } from "node:os";
-import stringArgv from "string-argv";
-import * as path from "path";
-
-class NixInstallerAction {
-  platform: string;
-  nix_package_url: string | null;
-  backtrace: string | null;
-  extra_args: string | null;
-  extra_conf: string[] | null;
-  flakehub: boolean;
-  kvm: boolean;
-  github_server_url: string | null;
-  github_token: string | null;
-  force_docker_shim: boolean | null;
-  init: string | null;
-  local_root: string | null;
-  log_directives: string | null;
-  logger: string | null;
-  ssl_cert_file: string | null;
-  proxy: string | null;
-  mac_case_sensitive: string | null;
-  mac_encrypt: string | null;
-  mac_root_disk: string | null;
-  mac_volume_label: string | null;
-  modify_profile: boolean;
-  nix_build_group_id: number | null;
-  nix_build_group_name: string | null;
-  nix_build_user_base: number | null;
-  nix_build_user_count: number | null;
-  nix_build_user_prefix: string | null;
-  planner: string | null;
-  reinstall: boolean;
-  start_daemon: boolean;
-  diagnostic_endpoint: string | null;
-  trust_runner_user: boolean | null;
-  nix_installer_url: URL;
-
-  // Connects the installation diagnostic report to the post-run diagnostic report.
-  // This is for monitoring the real impact of Nix updates, to avoid breaking large
-  // swaths of users at once with botched Nix releases. For example:
-  // https://github.com/NixOS/nix/issues/9052.
-  correlation: string;
-
-  constructor(correlation: string) {
-    this.platform = get_nix_platform();
-    this.nix_package_url = action_input_string_or_null("nix-package-url");
-    this.backtrace = action_input_string_or_null("backtrace");
-    this.extra_args = action_input_string_or_null("extra-args");
-    this.extra_conf = action_input_multiline_string_or_null("extra-conf");
-    this.flakehub = action_input_bool("flakehub");
-    this.kvm = action_input_bool("kvm");
-    this.force_docker_shim = action_input_bool("force-docker-shim");
-    this.github_token = action_input_string_or_null("github-token");
-    this.github_server_url = action_input_string_or_null("github-server-url");
-    this.init = action_input_string_or_null("init");
-    this.local_root = action_input_string_or_null("local-root");
-    this.log_directives = action_input_string_or_null("log-directives");
-    this.logger = action_input_string_or_null("logger");
-    this.ssl_cert_file = action_input_string_or_null("ssl-cert-file");
-    this.proxy = action_input_string_or_null("proxy");
-    this.mac_case_sensitive = action_input_string_or_null("mac-case-sensitive");
-    this.mac_encrypt = action_input_string_or_null("mac-encrypt");
-    this.mac_root_disk = action_input_string_or_null("mac-root-disk");
-    this.mac_volume_label = action_input_string_or_null("mac-volume-label");
-    this.modify_profile = action_input_bool("modify-profile");
-    this.nix_build_group_id = action_input_number_or_null("nix-build-group-id");
-    this.nix_build_group_name = action_input_string_or_null(
-      "nix-build-group-name",
-    );
-    this.nix_build_user_base = action_input_number_or_null(
-      "nix_build-user-base",
-    );
-    this.nix_build_user_count = action_input_number_or_null(
-      "nix-build-user-count",
-    );
-    this.nix_build_user_prefix = action_input_string_or_null(
-      "nix-build-user-prefix",
-    );
-    this.planner = action_input_string_or_null("planner");
-    this.reinstall = action_input_bool("reinstall");
-    this.start_daemon = action_input_bool("start-daemon");
-    this.diagnostic_endpoint = action_input_string_or_null(
-      "diagnostic-endpoint",
-    );
-    this.trust_runner_user = action_input_bool("trust-runner-user");
-    this.correlation = correlation;
-    this.nix_installer_url = resolve_nix_installer_url(
-      this.platform,
-      this.correlation,
-    );
-  }
-
-  async detectAndForceDockerShim(): Promise<void> {
-    // Detect if we're in a GHA runner which is Linux, doesn't have Systemd, and does have Docker.
-    // This is a common case in self-hosted runners, providers like [Namespace](https://namespace.so/),
-    // and especially GitHub Enterprise Server.
-    if (process.env.RUNNER_OS !== "Linux") {
-      if (this.force_docker_shim) {
-        actions_core.warning(
-          "Ignoring force-docker-shim which is set to true, as it is only supported on Linux.",
-        );
-        this.force_docker_shim = false;
-      }
-      return;
-    }
-
-    const systemdCheck = fs.statSync("/run/systemd/system", {
-      throwIfNoEntry: false,
-    });
-    if (systemdCheck?.isDirectory()) {
-      if (this.force_docker_shim) {
-        actions_core.warning(
-          "Systemd is detected, but ignoring it since force-docker-shim is enabled.",
-        );
-      } else {
-        return;
-      }
-    }
-
-    actions_core.debug(
-      "Linux detected without systemd, testing for Docker with `docker info` as an alternative daemon supervisor.",
-    );
-    const exit_code = await actions_exec.exec("docker", ["info"], {
-      silent: true,
-      listeners: {
-        stdout: (data: Buffer) => {
-          const trimmed = data.toString("utf-8").trimEnd();
-          if (trimmed.length >= 0) {
-            actions_core.debug(trimmed);
-          }
-        },
-        stderr: (data: Buffer) => {
-          const trimmed = data.toString("utf-8").trimEnd();
-          if (trimmed.length >= 0) {
-            actions_core.debug(trimmed);
-          }
-        },
-      },
-    });
-
-    if (exit_code !== 0) {
-      if (this.force_docker_shim) {
-        actions_core.warning(
-          "docker info check failed, but trying anyway since force-docker-shim is enabled.",
-        );
-      } else {
-        return;
-      }
-    }
-
-    actions_core.startGroup(
-      "Enabling the Docker shim for running Nix on Linux in CI without Systemd.",
-    );
-
-    if (this.init !== "none") {
-      actions_core.info(`Changing init from '${this.init}' to 'none'`);
-      this.init = "none";
-    }
-    if (this.planner !== "linux") {
-      actions_core.info(`Changing planner from '${this.planner}' to 'linux'`);
-      this.planner = "linux";
-    }
-
-    this.force_docker_shim = true;
-
-    actions_core.endGroup();
-  }
-
-  private async executionEnvironment(): Promise<ExecuteEnvironment> {
-    const execution_env: ExecuteEnvironment = {};
-
-    execution_env.NIX_INSTALLER_NO_CONFIRM = "true";
-    execution_env.NIX_INSTALLER_DIAGNOSTIC_ATTRIBUTION = this.correlation;
-
-    if (this.backtrace !== null) {
-      execution_env.RUST_BACKTRACE = this.backtrace;
-    }
-    if (this.modify_profile !== null) {
-      if (this.modify_profile) {
-        execution_env.NIX_INSTALLER_MODIFY_PROFILE = "true";
-      } else {
-        execution_env.NIX_INSTALLER_MODIFY_PROFILE = "false";
-      }
-    }
-
-    if (this.nix_build_group_id !== null) {
-      execution_env.NIX_INSTALLER_NIX_BUILD_GROUP_ID = `${this.nix_build_group_id}`;
-    }
-
-    if (this.nix_build_group_name !== null) {
-      execution_env.NIX_INSTALLER_NIX_BUILD_GROUP_NAME =
-        this.nix_build_group_name;
-    }
-
-    if (this.nix_build_user_prefix !== null) {
-      execution_env.NIX_INSTALLER_NIX_BUILD_USER_PREFIX =
-        this.nix_build_user_prefix;
-    }
-
-    if (this.nix_build_user_count !== null) {
-      execution_env.NIX_INSTALLER_NIX_BUILD_USER_COUNT = `${this.nix_build_user_count}`;
-    }
-
-    if (this.nix_build_user_base !== null) {
-      execution_env.NIX_INSTALLER_NIX_BUILD_USER_ID_BASE = `${this.nix_build_user_count}`;
-    }
-
-    if (this.nix_package_url !== null) {
-      execution_env.NIX_INSTALLER_NIX_PACKAGE_URL = `${this.nix_package_url}`;
-    }
-
-    if (this.proxy !== null) {
-      execution_env.NIX_INSTALLER_PROXY = this.proxy;
-    }
-
-    if (this.ssl_cert_file !== null) {
-      execution_env.NIX_INSTALLER_SSL_CERT_FILE = this.ssl_cert_file;
-    }
-
-    if (this.diagnostic_endpoint !== null) {
-      execution_env.NIX_INSTALLER_DIAGNOSTIC_ENDPOINT =
-        this.diagnostic_endpoint;
-    }
-
-    // TODO: Error if the user uses these on not-MacOS
-    if (this.mac_encrypt !== null) {
-      if (process.env.RUNNER_OS !== "macOS") {
-        throw new Error("`mac-encrypt` while `$RUNNER_OS` was not `macOS`");
-      }
-      execution_env.NIX_INSTALLER_ENCRYPT = this.mac_encrypt;
-    }
-
-    if (this.mac_case_sensitive !== null) {
-      if (process.env.RUNNER_OS !== "macOS") {
-        throw new Error(
-          "`mac-case-sensitive` while `$RUNNER_OS` was not `macOS`",
-        );
-      }
-      execution_env.NIX_INSTALLER_CASE_SENSITIVE = this.mac_case_sensitive;
-    }
-
-    if (this.mac_volume_label !== null) {
-      if (process.env.RUNNER_OS !== "macOS") {
-        throw new Error(
-          "`mac-volume-label` while `$RUNNER_OS` was not `macOS`",
-        );
-      }
-      execution_env.NIX_INSTALLER_VOLUME_LABEL = this.mac_volume_label;
-    }
-
-    if (this.mac_root_disk !== null) {
-      if (process.env.RUNNER_OS !== "macOS") {
-        throw new Error("`mac-root-disk` while `$RUNNER_OS` was not `macOS`");
-      }
-      execution_env.NIX_INSTALLER_ROOT_DISK = this.mac_root_disk;
-    }
-
-    if (this.logger !== null) {
-      execution_env.NIX_INSTALLER_LOGGER = this.logger;
-    }
-
-    if (this.log_directives !== null) {
-      execution_env.NIX_INSTALLER_LOG_DIRECTIVES = this.log_directives;
-    }
-
-    // TODO: Error if the user uses these on MacOS
-    if (this.init !== null) {
-      if (process.env.RUNNER_OS === "macOS") {
-        throw new Error(
-          "`init` is not a valid option when `$RUNNER_OS` is `macOS`",
-        );
-      }
-      execution_env.NIX_INSTALLER_INIT = this.init;
-    }
-
-    if (this.start_daemon !== null) {
-      if (this.start_daemon) {
-        execution_env.NIX_INSTALLER_START_DAEMON = "true";
-      } else {
-        execution_env.NIX_INSTALLER_START_DAEMON = "false";
-      }
-    }
-
-    let extra_conf = "";
-    if (this.github_server_url !== null && this.github_token !== null) {
-      const server_url = this.github_server_url.replace("https://", "");
-      extra_conf += `access-tokens = ${server_url}=${this.github_token}`;
-      extra_conf += "\n";
-    }
-    if (this.trust_runner_user !== null) {
-      const user = userInfo().username;
-      if (user) {
-        extra_conf += `trusted-users = root ${user}`;
-      } else {
-        extra_conf += `trusted-users = root`;
-      }
-      extra_conf += "\n";
-    }
-    if (this.flakehub) {
-      extra_conf += `netrc-file = ${await this.flakehub_login()}`;
-      extra_conf += "\n";
-    }
-    if (this.extra_conf !== null && this.extra_conf.length !== 0) {
-      extra_conf += this.extra_conf.join("\n");
-      extra_conf += "\n";
-    }
-    execution_env.NIX_INSTALLER_EXTRA_CONF = extra_conf;
-
-    if (process.env.ACT && !process.env.NOT_ACT) {
-      actions_core.info(
-        "Detected `$ACT` environment, assuming this is a https://github.com/nektos/act created container, set `NOT_ACT=true` to override this. This will change the setting of the `init` to be compatible with `act`",
-      );
-      execution_env.NIX_INSTALLER_INIT = "none";
-    }
-
-    if (process.env.NSC_VM_ID && !process.env.NOT_NAMESPACE) {
-      actions_core.info(
-        "Detected Namespace runner, assuming this is a https://namespace.so created container, set `NOT_NAMESPACE=true` to override this. This will change the setting of the `init` to be compatible with Namespace",
-      );
-      execution_env.NIX_INSTALLER_INIT = "none";
-    }
-
-    return execution_env;
-  }
-
-  private async execute_install(binary_path: string): Promise<number> {
-    const execution_env = await this.executionEnvironment();
-    actions_core.debug(
-      `Execution environment: ${JSON.stringify(execution_env, null, 4)}`,
-    );
-
-    const args = ["install"];
-    if (this.planner) {
-      args.push(this.planner);
-    } else {
-      args.push(get_default_planner());
-    }
-
-    if (this.extra_args) {
-      const extra_args = stringArgv(this.extra_args);
-      args.concat(extra_args);
-    }
-
-    const exit_code = await actions_exec.exec(binary_path, args, {
-      env: {
-        ...execution_env,
-        ...process.env, // To get $PATH, etc
-      },
-    });
-
-    if (exit_code !== 0) {
-      throw new Error(`Non-zero exit code of \`${exit_code}\` detected`);
-    }
-
-    return exit_code;
-  }
-
-  async install(): Promise<void> {
-    const existing_install = await this.detect_existing();
-    if (existing_install) {
-      if (this.reinstall) {
-        // We need to uninstall, then reinstall
-        actions_core.info(
-          "Nix was already installed, `reinstall` is set, uninstalling for a reinstall",
-        );
-        await this.execute_uninstall();
-      } else {
-        // We're already installed, and not reinstalling, just set GITHUB_PATH and finish early
-        await this.set_github_path();
-        actions_core.info("Nix was already installed, using existing install");
-        return;
-      }
-    }
-
-    if (this.kvm) {
-      actions_core.startGroup("Configuring KVM");
-      if (await this.setup_kvm()) {
-        actions_core.endGroup();
-        actions_core.info(
-          "\u001b[32m Accelerated KVM is enabled \u001b[33m⚡️",
-        );
-        actions_core.exportVariable("DETERMINATE_NIX_KVM", "1");
-      } else {
-        actions_core.endGroup();
-        actions_core.info("KVM is not available.");
-        actions_core.exportVariable("DETERMINATE_NIX_KVM", "0");
-      }
-
-      actions_core.exportVariable("DETERMINATE_NIX_KVM", "0");
-    }
-
-    // Normal just doing of the install
-    actions_core.startGroup("Installing Nix");
-    const binary_path = await this.fetch_binary();
-    await this.execute_install(binary_path);
-    actions_core.endGroup();
-
-    if (this.force_docker_shim) {
-      await this.spawnDockerShim();
-    }
-    await this.set_github_path();
-  }
-
-  async spawnDockerShim(): Promise<void> {
-    actions_core.startGroup(
-      "Configuring the Docker shim as the Nix Daemon's process supervisor",
-    );
-
-    const images: { [key: string]: string } = {
-      X64: path.join(__dirname, "/../docker-shim/amd64.tar.gz"),
-      ARM64: path.join(__dirname, "/../docker-shim/arm64.tar.gz"),
-    };
-
-    let arch;
-    if (process.env.RUNNER_ARCH === "X64") {
-      arch = "X64";
-    } else if (process.env.RUNNER_ARCH === "ARM64") {
-      arch = "ARM64";
-    } else {
-      throw Error("Architecture not supported in Docker shim mode.");
-    }
-    actions_core.debug("Loading image: determinate-nix-shim:latest...");
-    {
-      const exit_code = await actions_exec.exec(
-        "docker",
-        ["image", "load", "--input", images[arch]],
-        {
-          silent: true,
-          listeners: {
-            stdout: (data: Buffer) => {
-              const trimmed = data.toString("utf-8").trimEnd();
-              if (trimmed.length >= 0) {
-                actions_core.debug(trimmed);
-              }
-            },
-            stderr: (data: Buffer) => {
-              const trimmed = data.toString("utf-8").trimEnd();
-              if (trimmed.length >= 0) {
-                actions_core.debug(trimmed);
-              }
-            },
-          },
-        },
-      );
-
-      if (exit_code !== 0) {
-        throw new Error(
-          `Failed to build the shim image, exit code: \`${exit_code}\``,
-        );
-      }
-    }
-
-    {
-      actions_core.debug("Starting the Nix daemon through Docker...");
-      const exit_code = await actions_exec.exec(
-        "docker",
-        [
-          "--log-level=debug",
-          "run",
-          "--detach",
-          "--privileged",
-          "--userns=host",
-          "--pid=host",
-          "--mount",
-          "type=bind,src=/tmp,dst=/tmp",
-          "--mount",
-          "type=bind,src=/nix,dst=/nix",
-          "--mount",
-          "type=bind,src=/etc,dst=/etc,readonly",
-          "--restart",
-          "always",
-          "--init",
-          "--name",
-          `determinate-nix-shim-${this.correlation}`,
-          "determinate-nix-shim:latest",
-        ],
-        {
-          silent: true,
-          listeners: {
-            stdline: (data: string) => {
-              actions_core.saveState(
-                "docker_shim_container_id",
-                data.trimEnd(),
-              );
-            },
-            stdout: (data: Buffer) => {
-              const trimmed = data.toString("utf-8").trimEnd();
-              if (trimmed.length >= 0) {
-                actions_core.debug(trimmed);
-              }
-            },
-            stderr: (data: Buffer) => {
-              const trimmed = data.toString("utf-8").trimEnd();
-              if (trimmed.length >= 0) {
-                actions_core.debug(trimmed);
-              }
-            },
-          },
-        },
-      );
-
-      if (exit_code !== 0) {
-        throw new Error(
-          `Failed to start the Nix daemon through Docker, exit code: \`${exit_code}\``,
-        );
-      }
-    }
-
-    actions_core.endGroup();
-
-    return;
-  }
-  async cleanupDockerShim(): Promise<void> {
-    const container_id = actions_core.getState("docker_shim_container_id");
-    if (container_id !== "") {
-      actions_core.startGroup("Cleaning up the Nix daemon's Docker shim");
-
-      await actions_exec.exec("docker", ["rm", "--force", container_id]);
-
-      actions_core.endGroup();
-    }
-  }
-
-  async set_github_path(): Promise<void> {
-    // Interim versions of the `nix-installer` crate may have already manipulated `$GITHUB_PATH`, as root even! Accessing that will be an error.
-    try {
-      const nix_var_nix_profile_path = "/nix/var/nix/profiles/default/bin";
-      const home_nix_profile_path = `${process.env.HOME}/.nix-profile/bin`;
-      actions_core.addPath(nix_var_nix_profile_path);
-      actions_core.addPath(home_nix_profile_path);
-      actions_core.info(
-        `Added \`${nix_var_nix_profile_path}\` and \`${home_nix_profile_path}\` to \`$GITHUB_PATH\``,
-      );
-    } catch (error) {
-      actions_core.info(
-        "Skipping setting $GITHUB_PATH in action, the `nix-installer` crate seems to have done this already. From `nix-installer` version 0.11.0 and up, this step is done in the action. Prior to 0.11.0, this was only done in the `nix-installer` binary.",
-      );
-    }
-  }
-
-  async flakehub_login(): Promise<string> {
-    const netrc_path = `${process.env["RUNNER_TEMP"]}/determinate-nix-installer-netrc`;
-
-    const jwt = await actions_core.getIDToken("api.flakehub.com");
-
-    await writeFile(
-      netrc_path,
-      [
-        `machine api.flakehub.com login flakehub password ${jwt}`,
-        `machine flakehub.com login flakehub password ${jwt}`,
-      ].join("\n"),
-    );
-
-    actions_core.info("Logging in to FlakeHub.");
-
-    // the join followed by a match on ^... looks silly, but extra_config
-    // could contain multi-line values
-    if (this.extra_conf?.join("\n").match(/^netrc-file/m)) {
-      actions_core.warning(
-        "Logging in to FlakeHub conflicts with the Nix option `netrc-file`.",
-      );
-    }
-
-    return netrc_path;
-  }
-
-  async execute_uninstall(): Promise<number> {
-    const exit_code = await actions_exec.exec(
-      `/nix/nix-installer`,
-      ["uninstall"],
-      {
-        env: {
-          NIX_INSTALLER_NO_CONFIRM: "true",
-          ...process.env, // To get $PATH, etc
-        },
-      },
-    );
-
-    if (exit_code !== 0) {
-      throw new Error(`Non-zero exit code of \`${exit_code}\` detected`);
-    }
-
-    return exit_code;
-  }
-
-  async detect_existing(): Promise<boolean> {
-    const receipt_path = "/nix/receipt.json";
-    try {
-      await access(receipt_path);
-      // There is a /nix/receipt.json
-      return true;
-    } catch {
-      // No /nix/receipt.json
-      return false;
-    }
-  }
-
-  private async setup_kvm(): Promise<boolean> {
-    const kvm_rules =
-      "/etc/udev/rules.d/99-determinate-nix-installer-kvm.rules";
-    try {
-      const write_file_exit_code = await actions_exec.exec(
-        "sh",
-        [
-          "-c",
-          `echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee ${kvm_rules} > /dev/null`,
-        ],
-        {
-          silent: true,
-          listeners: {
-            stdout: (data: Buffer) => {
-              const trimmed = data.toString("utf-8").trimEnd();
-              if (trimmed.length >= 0) {
-                actions_core.debug(trimmed);
-              }
-            },
-            stderr: (data: Buffer) => {
-              const trimmed = data.toString("utf-8").trimEnd();
-              if (trimmed.length >= 0) {
-                actions_core.debug(trimmed);
-              }
-            },
-          },
-        },
-      );
-
-      if (write_file_exit_code !== 0) {
-        throw new Error(
-          `Non-zero exit code of \`${write_file_exit_code}\` detected while writing '${kvm_rules}'`,
-        );
-      }
-
-      const debug_run_throw = async (
-        action: string,
-        command: string,
-        args: string[],
-      ): Promise<void> => {
-        const reload_exit_code = await actions_exec.exec(command, args, {
-          silent: true,
-          listeners: {
-            stdout: (data: Buffer) => {
-              const trimmed = data.toString("utf-8").trimEnd();
-              if (trimmed.length >= 0) {
-                actions_core.debug(trimmed);
-              }
-            },
-            stderr: (data: Buffer) => {
-              const trimmed = data.toString("utf-8").trimEnd();
-              if (trimmed.length >= 0) {
-                actions_core.debug(trimmed);
-              }
-            },
-          },
-        });
-
-        if (reload_exit_code !== 0) {
-          throw new Error(
-            `Non-zero exit code of \`${reload_exit_code}\` detected while ${action}.`,
-          );
-        }
-      };
-
-      await debug_run_throw("reloading udev rules", `sudo`, [
-        "udevadm",
-        "control",
-        "--reload-rules",
-      ]);
-
-      await debug_run_throw("triggering udev against kvm", `sudo`, [
-        "udevadm",
-        "trigger",
-        "--name-match=kvm",
-      ]);
-
-      return true;
-    } catch (error) {
-      await actions_exec.exec("sudo", ["rm", "-f", kvm_rules]);
-
-      return false;
-    }
-  }
-
-  private async fetch_binary(): Promise<string> {
-    if (!this.local_root) {
-      actions_core.info(`Fetching binary from ${this.nix_installer_url}`);
-      const binaryPath = await actions_tool_cache.downloadTool(
-        String(this.nix_installer_url),
-      );
-      // Make executable
-      await chmod(binaryPath, fs.constants.S_IXUSR | fs.constants.S_IXGRP);
-
-      return binaryPath;
-    } else {
-      const local_path = join(
-        this.local_root,
-        `nix-installer-${this.platform}`,
-      );
-      actions_core.info(`Using binary ${local_path}`);
-      return local_path;
-    }
-  }
-
-  async report_overall(): Promise<void> {
-    if (this.diagnostic_endpoint == null) {
-      return;
-    }
-
-    try {
-      await fetch(this.diagnostic_endpoint, {
-        method: "POST",
-        headers: {
-          "Content-Type": "application/json",
-        },
-        body: JSON.stringify({
-          "post-github-workflow-run-report": true,
-          correlation: this.correlation,
-          conclusion: await this.get_workflow_conclusion(),
-        }),
-      });
-    } catch (error) {
-      actions_core.debug(
-        `Error submitting post-run diagnostics report: ${error}`,
-      );
-    }
-  }
-
-  private async get_workflow_conclusion(): Promise<
-    undefined | "success" | "failure" | "cancelled" | "unavailable" | "no-jobs"
-  > {
-    if (this.github_token == null) {
-      return undefined;
-    }
-
-    try {
-      const octokit = github.getOctokit(this.github_token);
-      const jobs = await octokit.paginate(
-        octokit.rest.actions.listJobsForWorkflowRun,
-        {
-          owner: github.context.repo.owner,
-          repo: github.context.repo.repo,
-          run_id: github.context.runId,
-        },
-      );
-
-      actions_core.debug(`awaited jobs: ${jobs}`);
-      const job = jobs
-        .filter((candidate) => candidate.name === github.context.job)
-        .at(0);
-      if (job === undefined) {
-        return "no-jobs";
-      }
-
-      const outcomes = (job.steps || []).map((j) => j.conclusion || "unknown");
-
-      // Possible values: success, failure, cancelled, or skipped
-      // from: https://docs.github.com/en/actions/learn-github-actions/contexts
-
-      if (outcomes.includes("failure")) {
-        // Any failures fails the job
-        return "failure";
-      }
-      if (outcomes.includes("cancelled")) {
-        // Any cancellations cancels the job
-        return "cancelled";
-      }
-
-      // Assume success if no jobs failed or were canceled
-      return "success";
-    } catch (error) {
-      actions_core.debug(`Error determining final disposition: ${error}`);
-      return "unavailable";
-    }
-  }
-}
-
-type ExecuteEnvironment = {
-  // All env vars are strings, no fanciness here.
-  RUST_BACKTRACE?: string;
-  NIX_INSTALLER_MODIFY_PROFILE?: string;
-  NIX_INSTALLER_NIX_BUILD_GROUP_NAME?: string;
-  NIX_INSTALLER_NIX_BUILD_GROUP_ID?: string;
-  NIX_INSTALLER_NIX_BUILD_USER_PREFIX?: string;
-  NIX_INSTALLER_NIX_BUILD_USER_COUNT?: string;
-  NIX_INSTALLER_NIX_BUILD_USER_ID_BASE?: string;
-  NIX_INSTALLER_NIX_PACKAGE_URL?: string;
-  NIX_INSTALLER_PROXY?: string;
-  NIX_INSTALLER_SSL_CERT_FILE?: string;
-  NIX_INSTALLER_DIAGNOSTIC_ENDPOINT?: string;
-  NIX_INSTALLER_DIAGNOSTIC_ATTRIBUTION?: string;
-  NIX_INSTALLER_ENCRYPT?: string;
-  NIX_INSTALLER_CASE_SENSITIVE?: string;
-  NIX_INSTALLER_VOLUME_LABEL?: string;
-  NIX_INSTALLER_ROOT_DISK?: string;
-  NIX_INSTALLER_INIT?: string;
-  NIX_INSTALLER_START_DAEMON?: string;
-  NIX_INSTALLER_NO_CONFIRM?: string;
-  NIX_INSTALLER_EXTRA_CONF?: string;
-  NIX_INSTALLER_LOG_DIRECTIVES?: string;
-  NIX_INSTALLER_LOGGER?: string;
-};
-
-function get_nix_platform(): string {
-  const env_os = process.env.RUNNER_OS;
-  const env_arch = process.env.RUNNER_ARCH;
-
-  if (env_os === "macOS" && env_arch === "X64") {
-    return "x86_64-darwin";
-  } else if (env_os === "macOS" && env_arch === "ARM64") {
-    return "aarch64-darwin";
-  } else if (env_os === "Linux" && env_arch === "X64") {
-    return "x86_64-linux";
-  } else if (env_os === "Linux" && env_arch === "ARM64") {
-    return "aarch64-linux";
-  } else {
-    throw new Error(
-      `Unsupported \`RUNNER_OS\` (currently \`${env_os}\`) and \`RUNNER_ARCH\` (currently \`${env_arch}\`)  combination`,
-    );
-  }
-}
-
-function get_default_planner(): string {
-  const env_os = process.env.RUNNER_OS;
-
-  if (env_os === "macOS") {
-    return "macos";
-  } else if (env_os === "Linux") {
-    return "linux";
-  } else {
-    throw new Error(`Unsupported \`RUNNER_OS\` (currently \`${env_os}\`)`);
-  }
-}
-
-function resolve_nix_installer_url(
-  platform: string,
-  correlation?: string,
-): URL {
-  // Only one of these are allowed.
-  const nix_installer_branch = action_input_string_or_null(
-    "nix-installer-branch",
-  );
-  const nix_installer_pr = action_input_number_or_null("nix-installer-pr");
-  const nix_installer_revision = action_input_string_or_null(
-    "nix-installer-revision",
-  );
-  const nix_installer_tag = action_input_string_or_null("nix-installer-tag");
-  const nix_installer_url = action_input_string_or_null("nix-installer-url");
-  const url_suffix = `ci=github&correlation=${correlation}`;
-  let resolved_nix_installer_url = null;
-  let num_set = 0;
-
-  if (nix_installer_branch !== null) {
-    num_set += 1;
-    resolved_nix_installer_url = new URL(
-      `https://install.determinate.systems/nix/branch/${nix_installer_branch}/nix-installer-${platform}?${url_suffix}`,
-    );
-  }
-  if (nix_installer_pr !== null) {
-    num_set += 1;
-    resolved_nix_installer_url = new URL(
-      `https://install.determinate.systems/nix/pr/${nix_installer_pr}/nix-installer-${platform}?${url_suffix}`,
-    );
-  }
-  if (nix_installer_revision !== null) {
-    num_set += 1;
-    resolved_nix_installer_url = new URL(
-      `https://install.determinate.systems/nix/rev/${nix_installer_revision}/nix-installer-${platform}?${url_suffix}`,
-    );
-  }
-  if (nix_installer_tag !== null) {
-    num_set += 1;
-    resolved_nix_installer_url = new URL(
-      `https://install.determinate.systems/nix/tag/${nix_installer_tag}/nix-installer-${platform}?${url_suffix}`,
-    );
-  }
-  if (nix_installer_url !== null) {
-    num_set += 1;
-    resolved_nix_installer_url = new URL(nix_installer_url);
-  }
-  if (resolved_nix_installer_url == null) {
-    resolved_nix_installer_url = new URL(
-      `https://install.determinate.systems/nix/nix-installer-${platform}?${url_suffix}`,
-    );
-  }
-
-  if (num_set > 1) {
-    throw new Error(
-      `The following options are mututally exclusive, but ${num_set} were set: \`nix_installer_branch\`, \`nix_installer_pr\`, \`nix_installer_revision\`, \`nix_installer_tag\`, and \`nix_installer_url\``,
-    );
-  }
-  return resolved_nix_installer_url;
-}
-
-function action_input_string_or_null(name: string): string | null {
-  const value = actions_core.getInput(name);
-  if (value === "") {
-    return null;
-  } else {
-    return value;
-  }
-}
-
-function action_input_multiline_string_or_null(name: string): string[] | null {
-  const value = actions_core.getMultilineInput(name);
-  if (value.length === 0) {
-    return null;
-  } else {
-    return value;
-  }
-}
-
-function action_input_number_or_null(name: string): number | null {
-  const value = actions_core.getInput(name);
-  if (value === "") {
-    return null;
-  } else {
-    return Number(value);
-  }
-}
-
-function action_input_bool(name: string): boolean {
-  return actions_core.getBooleanInput(name);
-}
-
-async function main(): Promise<void> {
-  try {
-    let correlation: string = actions_core.getState("correlation");
-    if (correlation === "") {
-      correlation = `GH-${randomUUID()}`;
-      actions_core.saveState("correlation", correlation);
-    }
-
-    const installer = new NixInstallerAction(correlation);
-
-    const isPost = actions_core.getState("isPost");
-    if (isPost !== "true") {
-      await installer.detectAndForceDockerShim();
-      await installer.install();
-      actions_core.saveState("isPost", "true");
-    } else {
-      await installer.cleanupDockerShim();
-      await installer.report_overall();
-    }
-  } catch (error) {
-    if (error instanceof Error) actions_core.setFailed(error);
-  }
-}
-
-await main();

src/mermaid.test.ts

@@ -0,0 +1,207 @@
+import { mermaidify, makeMermaidReport } from "./mermaid.js";
+import { DEvent, parseEvents } from "./events.js";
+import { expect, test } from "vitest";
+
+/* eslint-disable @typescript-eslint/no-non-null-assertion */
+
+function generateEvents(count: number): DEvent[] {
+  const events: DEvent[] = [];
+
+  for (let i = 0; i < count; i++) {
+    events.push({
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: `/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-${i}.drv`,
+      timing: {
+        startTime: new Date(i * 1000),
+        durationSeconds: i,
+      },
+    });
+  }
+
+  return events;
+}
+
+test("Empty event list returns no report", () => {
+  const report = makeMermaidReport([]);
+
+  expect(report).toBeUndefined();
+});
+
+test("Create a very large report doc and make sure it is small enough", () => {
+  const report = makeMermaidReport(generateEvents(2500))!;
+
+  // Assert the `.drv` suffix was pruned (1 reference = the NOTE at the end)
+  expect(report.match(/\.drv/g)!.length).equals(1);
+
+  // Assert the `/nix/store` prefix was pruned (1 reference = the NOTE at the end)
+  expect(report.match(/\/nix\/store\//g)!.length).equals(1);
+
+  // Assert that some events were pruned
+  expect(report.match(/dep-/g)!.length).lessThan(2500);
+  expect(report.match(/dep-/g)!.length).greaterThan(1500);
+
+  expect(report).toContain("suffix, and builds that took less than ");
+
+  expect(report.length).lessThan(50200);
+  expect(report.length).greaterThan(49000);
+});
+
+test("Create a medium large report doc and make sure it is small enough", () => {
+  const eventCount = 675;
+  const report = makeMermaidReport(generateEvents(eventCount))!;
+
+  // Assert the `.drv` suffix was pruned (1 reference = the NOTE at the end)
+  expect(report.match(/\.drv/g)!.length).equals(1);
+
+  // Assert the `/nix/store` prefix was pruned (1 reference = the NOTE at the end)
+  expect(report.match(/\/nix\/store\//g)!.length).equals(1);
+
+  // Assert that no lines were pruned
+  expect(report.match(/dep-/g)!.length).toStrictEqual(eventCount);
+
+  expect(report).toContain(
+    "suffixes have been removed to make the graph small enough to render",
+  );
+
+  expect(report.length).lessThan(50200);
+  expect(report.length).greaterThan(18000);
+});
+
+test("Create a small report doc and make sure it isn't pruned", () => {
+  const report = makeMermaidReport(generateEvents(100))!;
+
+  // Assert 100 events have the `.drv` suffix, ie: were not pruned
+  expect(report.match(/\.drv/g)!.length).equals(100);
+
+  // Assert 100 events have the `.drv` suffix, ie: were not pruned
+  expect(report.match(/\/nix\/store\//g)!.length).equals(100);
+
+  expect(report.length).lessThan(50000);
+});
+
+test("Generate a really big report and shrink it", () => {
+  const events = generateEvents(1000);
+
+  const originalLength = mermaidify(events, -1)!.length;
+  const limitedLengthZero = mermaidify(events, 0)!.length;
+  const limitedLengthOne = mermaidify(events, 1)!.length;
+  const limitedLengthTwo = mermaidify(events, 2)!.length;
+
+  expect(originalLength).greaterThan(limitedLengthZero);
+  expect(limitedLengthZero).greaterThan(limitedLengthOne);
+  expect(limitedLengthOne).greaterThan(limitedLengthTwo);
+});
+
+test("Generate a rough report of various length", () => {
+  const { events } = parseEvents([
+    {
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: "/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-0.drv",
+      outputs: ["/nix/store/qwlgz5da3pfb53gqpgdmazaj9jczrnly-dep-0"],
+      timing: {
+        startTime: "2025-04-11T14:38:02Z",
+        stopTime: "2025-04-11T14:38:05Z",
+        durationSeconds: 0,
+      },
+    },
+    {
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: "/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv",
+      outputs: ["/nix/store/qwlgz5da3pfb53gqpgdmazaj9jczrnly-dep-1"],
+      timing: {
+        startTime: "2025-04-11T14:38:02Z",
+        stopTime: "2025-04-11T14:38:05Z",
+        durationSeconds: 1,
+      },
+    },
+    {
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: "/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-2.drv",
+      outputs: ["/nix/store/qwlgz5da3pfb53gqpgdmazaj9jczrnly-dep-2"],
+      timing: {
+        startTime: "2025-04-11T14:38:02Z",
+        stopTime: "2025-04-11T14:38:05Z",
+        durationSeconds: 2,
+      },
+    },
+    {
+      v: "1",
+      c: "BuildFailureResponseEventV1",
+      drv: "/nix/store/ykvbksjqrza2zpj6nkbycrdfwgfdpr8g-hash-mismatch-md5-base16.drv",
+      timing: {
+        startTime: "2025-04-11T14:38:05Z",
+        stopTime: "2025-04-11T14:38:09Z",
+        durationSeconds: 4,
+      },
+    },
+  ]);
+
+  expect(mermaidify(events, -1)).toStrictEqual(`\`\`\`mermaid
+gantt
+    dateFormat X
+    axisFormat %Mm%Ss
+/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-0.drv (0s):d, 0, 0s
+/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-1.drv (1s):d, 0, 1s
+/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-2.drv (2s):d, 0, 2s
+/nix/store/ykvbksjqrza2zpj6nkbycrdfwgfdpr8g-hash-mismatch-md5-base16.drv (4s):crit, 3, 4s
+\`\`\``);
+
+  expect(mermaidify(events, 0)).toStrictEqual(`\`\`\`mermaid
+gantt
+    dateFormat X
+    axisFormat %Mm%Ss
+dep-0 (0s):d, 0, 0s
+dep-1 (1s):d, 0, 1s
+dep-2 (2s):d, 0, 2s
+hash-mismatch-md5-base16 (4s):crit, 3, 4s
+\`\`\``);
+
+  expect(mermaidify(events, 1)).toStrictEqual(`\`\`\`mermaid
+gantt
+    dateFormat X
+    axisFormat %Mm%Ss
+dep-1 (1s):d, 0, 1s
+dep-2 (2s):d, 0, 2s
+hash-mismatch-md5-base16 (4s):crit, 3, 4s
+\`\`\``);
+});
+
+test("Generate a really big report and shrink it", () => {
+  const events = generateEvents(1000);
+
+  const originalLength = mermaidify(events, -1)!.length;
+  const limitedLengthZero = mermaidify(events, 0)!.length;
+  const limitedLengthOne = mermaidify(events, 1)!.length;
+  const limitedLengthTwo = mermaidify(events, 2)!.length;
+
+  expect(originalLength).greaterThan(limitedLengthZero);
+  expect(limitedLengthZero).greaterThan(limitedLengthOne);
+  expect(limitedLengthOne).greaterThan(limitedLengthTwo);
+});
+
+test("Really long builds get multi-unit timestamps", () => {
+  const { events } = parseEvents([
+    {
+      v: "1",
+      c: "BuiltPathResponseEventV1",
+      drv: "/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-0.drv",
+      outputs: ["/nix/store/qwlgz5da3pfb53gqpgdmazaj9jczrnly-dep-0"],
+      timing: {
+        startTime: "2025-04-11T14:38:02Z",
+        stopTime: "2026-05-14T13:32:01Z",
+        durationSeconds: 34383239,
+      },
+    },
+  ]);
+
+  expect(mermaidify(events, -1)).toStrictEqual(`\`\`\`mermaid
+gantt
+    dateFormat X
+    axisFormat %Mm%Ss
+/nix/store/rz9hrpay90sjrid5hx3x8v606ji679xa-dep-0.drv (573053m59s):d, 0, 34383239s
+\`\`\``);
+});

src/mermaid.ts

@@ -0,0 +1,96 @@
+import { DEvent } from "./events.js";
+import { truncateDerivation } from "./util.js";
+
+export function makeMermaidReport(events: DEvent[]): string | undefined {
+  // # 50k is the max: https://github.com/mermaid-js/mermaid/blob/c269dc822c528e1afbde34e18a1cad03d972d4fe/src/defaultConfig.js#L55
+  const maxLength = 49900;
+  let mermaid = "";
+  let pruneLevel = -2;
+
+  do {
+    pruneLevel += 1;
+    mermaid = mermaidify(events, pruneLevel) ?? "";
+  } while (mermaid.length > maxLength);
+
+  if (!mermaid) {
+    return undefined;
+  }
+
+  const lines = [
+    "<details open><summary><strong>Build timeline</strong> :hourglass_flowing_sand:</summary>",
+    "", // load bearing whitespace, deleting it breaks the details expander / markdown
+    mermaid,
+    "", // load bearing whitespace, deleting it breaks the details expander / markdown
+  ];
+
+  if (pruneLevel === 0) {
+    lines.push("> [!NOTE]");
+    lines.push(
+      "> `/nix/store/[hash]` and the `.drv` suffixes have been removed to make the graph small enough to render.",
+    );
+  } else if (pruneLevel > 0) {
+    lines.push("> [!NOTE]");
+    lines.push(
+      `> \`/nix/store/[hash]\`, the \`.drv\` suffix, and builds that took less than ${formatDuration(pruneLevel)} have been removed to make the graph small enough to render.`,
+    );
+  }
+
+  lines.push(""); // load bearing whitespace, deleting it breaks the details expander / markdown
+  lines.push("</details>");
+
+  return lines.join("\n");
+}
+
+export function mermaidify(
+  allEvents: DEvent[],
+  pruneLevel: number,
+): string | undefined {
+  const events = allEvents
+    .filter(
+      (event) =>
+        event.c === "BuiltPathResponseEventV1" ||
+        event.c === "BuildFailureResponseEventV1",
+    )
+    .sort(
+      (a, b) => a.timing.startTime.getTime() - b.timing.startTime.getTime(),
+    );
+
+  const firstEvent = events.at(0);
+  if (firstEvent === undefined) {
+    return undefined;
+  }
+
+  const zeroMoment = firstEvent.timing.startTime.getTime();
+
+  const lines = [
+    "```mermaid",
+    "gantt",
+    "    dateFormat X",
+    "    axisFormat %Mm%Ss",
+  ];
+
+  for (const event of events) {
+    const duration = event.timing.durationSeconds;
+    if (duration < pruneLevel) {
+      continue;
+    }
+
+    const label = pruneLevel >= 0 ? truncateDerivation(event.drv) : event.drv;
+    const tag = event.c === "BuildFailureResponseEventV1" ? "crit" : "d";
+    const relativeStartTime =
+      (event.timing.startTime.getTime() - zeroMoment) / 1000;
+
+    lines.push(
+      `${label} (${formatDuration(duration)}):${tag}, ${relativeStartTime}, ${duration}s`,
+    );
+  }
+  lines.push("```");
+
+  return lines.join("\n");
+}
+
+function formatDuration(duration: number): string {
+  const durSeconds = duration % 60;
+  const durMinutes = (duration - durSeconds) / 60;
+  return `${durMinutes > 0 ? `${durMinutes}m` : ""}${durSeconds}s`;
+}

src/util.ts

@@ -0,0 +1,3 @@
+export function truncateDerivation(drv: string): string {
+  return drv.replace(/^\/nix\/store\/[a-z0-9]+-/, "").replace(/\.drv$/, "");
+}

tsconfig.json

@@ -1,16 +1,15 @@
 {
-    "compilerOptions": {
-        "target": "es2017", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
-        "module": "esnext",
-        "moduleResolution": "node",
-        "outDir": "./lib", /* Redirect output structure to the directory. */
-        "rootDir": "./src", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
-        "strict": true, /* Enable all strict type-checking options. */
-        "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
-        "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
-    },
-    "exclude": [
-        "node_modules",
-        "**/*.test.ts"
-    ]
+  "compilerOptions": {
+    "target": "ES2022" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */,
+    "module": "Node16",
+    "moduleResolution": "NodeNext",
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true /* Enable all strict type-checking options. */,
+    "noImplicitAny": true /* Raise error on expressions and declarations with an implied 'any' type. */,
+    "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
+    "resolveJsonModule": true,
+    "declaration": true
+  },
+  "exclude": ["node_modules", "dist"]
 }

tsup.config.ts

@@ -0,0 +1,15 @@
+import { defineConfig } from "tsup";
+import { name } from "./package.json";
+
+export default defineConfig({
+  name,
+  entry: ["src/index.ts"],
+  format: ["esm"],
+  target: "node20",
+  bundle: true,
+  splitting: false,
+  clean: true,
+  dts: {
+    resolve: true,
+  },
+});