Don't leak file handles

.github/workflows/ci.yml

@@ -3,25 +3,10 @@ name: CI
 on:
   pull_request:
   push:
-    branches: [main]
+    branches: [main, curl-data]
   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
@@ -51,15 +36,8 @@ jobs:
       matrix:
         runner:
           - 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
@@ -74,6 +52,12 @@ jobs:
           backtrace: full
           _internal-strict-mode: true
           determinate: ${{ matrix.determinate }}
+        # - name: Breakpoint if tests failed
+        #   uses: namespacelabs/breakpoint-action@v0
+        #   with:
+        #     duration: 30m
+        #     authorized-users: grahamc
+
       - name: echo $PATH
         run: echo $PATH
 
@@ -143,38 +127,3 @@ jobs:
           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/v0.18.0
-          - key: url
-            value: https://github.com/DeterminateSystems/nix-installer/releases/download/v0.18.0/nix-installer-x86_64-linux
-            nix-version: "2.21.2"
-          # https://github.com/DeterminateSystems/nix-installer/tree/7011c077ec491da410fbc39f68676b0908b9ce7e
-          - key: revision
-            value: 7011c077ec491da410fbc39f68676b0908b9ce7e
-            nix-version: "2.19.2"
-
-    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

CONTRIBUTING.md

@@ -1,5 +1,3 @@
 # Submitting Pull Requests
 
-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

@@ -34,7 +34,7 @@ jobs:
 
 ### With FlakeHub
 
-To fetch private flakes from FlakeHub and Nix builds from FlakeHub Cache, update the `permissions` block and use [`determinate-nix-action`][determinate-nix-action]:
+To fetch private flakes from FlakeHub and Nix builds from FlakeHub Cache, update the `permissions` block and pass `determinate: true`:
 
 ```yaml
 on:
@@ -51,25 +51,14 @@ jobs:
       contents: "read"
     steps:
       - uses: actions/checkout@v4
-      - uses: DeterminateSystems/determinate-nix-action@v3
+      - uses: DeterminateSystems/nix-installer-action@main
+        with:
+          determinate: true
       - 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.
@@ -100,7 +89,7 @@ Differing from the upstream [Nix](https://github.com/NixOS/nix) installer script
 | `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`                                                        |
+| `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`)                 |                                                                |
@@ -134,8 +123,6 @@ Differing from the upstream [Nix](https://github.com/NixOS/nix) installer script
 
 [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

@@ -21,8 +21,8 @@ inputs:
     description: Deprecated. Implies `determinate`.
     required: false
     default: false
-  force-no-systemd:
-    description: Force using other methods than systemd to launch the daemon. This setting is automatically enabled when necessary.
+  force-docker-shim:
+    description: Force the use of Docker as a process supervisor. This setting is automatically enabled when necessary.
     required: false
     default: false
   github-token:

docker-shim/Dockerfile

@@ -0,0 +1,19 @@
+# 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

@@ -0,0 +1,52 @@
+# 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.

package.json

@@ -11,8 +11,7 @@
     "check-fmt": "prettier --check .",
     "lint": "eslint src/**/*.ts",
     "package": "ncc build",
-    "test": "vitest --watch false",
-    "all": "pnpm run test && pnpm run format && pnpm run lint && pnpm run build && pnpm run package"
+    "all": "pnpm run format && pnpm run lint && pnpm run build && pnpm run package"
   },
   "repository": {
     "type": "git",
@@ -28,25 +27,24 @@
   "dependencies": {
     "@actions/core": "^1.11.1",
     "@actions/exec": "^1.1.1",
-    "@actions/github": "^6.0.1",
+    "@actions/github": "^6.0.0",
     "detsys-ts": "github:DeterminateSystems/detsys-ts",
-    "got": "^14.4.7",
-    "string-argv": "^0.3.2",
-    "vitest": "^3.2.4"
+    "got": "^14.4.6",
+    "string-argv": "^0.3.2"
   },
   "devDependencies": {
     "@trivago/prettier-plugin-sort-imports": "^4.3.0",
-    "@types/node": "^20.19.4",
+    "@types/node": "^20.17.28",
     "@types/uuid": "^9.0.8",
     "@typescript-eslint/eslint-plugin": "^7.18.0",
     "@vercel/ncc": "^0.38.3",
     "eslint": "^8.57.1",
-    "eslint-import-resolver-typescript": "^3.10.1",
+    "eslint-import-resolver-typescript": "^3.10.0",
     "eslint-plugin-github": "^4.10.2",
-    "eslint-plugin-import": "^2.32.0",
-    "eslint-plugin-prettier": "^5.5.1",
-    "prettier": "^3.6.2",
-    "tsup": "^8.5.0",
-    "typescript": "^5.8.3"
+    "eslint-plugin-import": "^2.31.0",
+    "eslint-plugin-prettier": "^5.2.5",
+    "prettier": "^3.5.3",
+    "tsup": "^8.4.0",
+    "typescript": "^5.8.2"
   }
 }

src/annotate.ts

@@ -1,66 +0,0 @@
-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

@@ -1,65 +0,0 @@
-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

@@ -1,89 +0,0 @@
-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

@@ -1,275 +0,0 @@
-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

@@ -1,124 +0,0 @@
-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

@@ -1,38 +0,0 @@
-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/mermaid.test.ts

@@ -1,207 +0,0 @@
-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

@@ -1,96 +0,0 @@
-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

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

tsconfig.json

@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "ES2022" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */,
+    "target": "ES2020" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */,
     "module": "Node16",
     "moduleResolution": "NodeNext",
     "outDir": "./dist",
@@ -11,5 +11,5 @@
     "resolveJsonModule": true,
     "declaration": true
   },
-  "exclude": ["node_modules", "dist"]
+  "exclude": ["node_modules", "**/*.test.ts", "dist"]
 }