Convert flakehub: true to determinate: true (#123)

* Drop the flakehub param to deprecated, use determinate, and log in to flakehub
* Expand the test suite to cover determinate on all our targets

---------

Co-authored-by: Luc Perkins <lucperkins@gmail.com>

.github/workflows/ci.yml

@@ -11,9 +11,9 @@ jobs:
     runs-on: ubuntu-22.04
     needs:
       - check-dist-up-to-date
-      - install-nix-linux
+      - install-nix
-      - install-nix-macos
       - 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.
@@ -44,14 +44,21 @@ jobs:
       - name: Ensure no staged changes
         run: git diff --exit-code
 
-  install-nix-linux:
+  install-nix:
-    name: Run test suite for Linux systems
+    name: "Test: ${{ matrix.runner }}${{ matrix.determinate && ' with determinate' || '' }}"
     strategy:
       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
@@ -65,6 +72,7 @@ jobs:
           log-directives: nix_installer=trace
           backtrace: full
           _internal-strict-mode: true
+          determinate: ${{ matrix.determinate }}
       - name: echo $PATH
         run: echo $PATH
 
@@ -82,85 +90,6 @@ jobs:
           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
-          _internal-strict-mode: true
-      - name: Test `nix` with `$GITHUB_PATH`
-        if: success() || failure()
-        run: |
-          nix run nixpkgs#hello
-          nix profile install nixpkgs#hello
-          hello
-          nix store gc
-          nix run nixpkgs#hello
-      - name: Reinstall Nix
-        uses: ./
-        with:
-          logger: pretty
-          log-directives: nix_installer=trace
-          backtrace: full
-          reinstall: true
-          extra-conf: |
-            use-sqlite-wal = true
-          _internal-strict-mode: true
-      - name: Test `nix` with `$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
-
-  install-nix-macos:
-    name: Run test suite for macOS systems
-    strategy:
-      matrix:
-        runner:
-          # x86_64-darwin
-          - macos-12
-          # aarch64-darwin
-          - macos-latest-xlarge
-    runs-on: ${{ matrix.runner }}
-    permissions:
-      contents: read
-      id-token: write
-    steps:
-      - uses: actions/checkout@v4
-      - name: Install Nix
-        uses: ./
-        with:
-          logger: pretty
-          log-directives: nix_installer=trace
-          backtrace: full
-          _internal-strict-mode: true
-      - 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()
@@ -170,9 +99,8 @@ 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:
@@ -180,6 +108,7 @@ jobs:
           log-directives: nix_installer=trace
           backtrace: full
           _internal-strict-mode: true
+          determinate: ${{ matrix.determinate }}
       - name: Test `nix` with `$GITHUB_PATH`
         if: success() || failure()
         run: |
@@ -198,6 +127,7 @@ jobs:
           extra-conf: |
             use-sqlite-wal = true
           _internal-strict-mode: true
+          determinate: ${{ matrix.determinate }}
       - name: Test `nix` with `$GITHUB_PATH`
         if: success() || failure()
         run: |
@@ -208,9 +138,10 @@ jobs:
           nix run nixpkgs#hello
       - name: Verify the generated nix.conf
         run: |
-          cat /etc/nix/nix.conf
+          nix config show
-          grep -E "^trusted-users = .*$USER" /etc/nix/nix.conf
+          cat -n /etc/nix/nix.conf
-          grep -E "^use-sqlite-wal = true" /etc/nix/nix.conf
+          nix config show | grep -E "^trusted-users = .*$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 }}
@@ -236,3 +167,13 @@ jobs:
           _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

README.md

@@ -34,7 +34,7 @@ jobs:
 
 ### 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 pass `determinate: true`:
 
 ```yaml
 on:
@@ -53,7 +53,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@main
         with:
-          flakehub: true
+          determinate: true
       - run: nix build .
 ```
 
@@ -85,9 +85,10 @@ Differing from the upstream [Nix](https://github.com/NixOS/nix) installer script
 | 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                                    | `false`                                                        |
 | `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`                                                        |
+| `flakehub`              | Deprecated. Implies `determinate`.                                                                                                                                                                                                                                             | 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 }}`                                         |

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: false
   extra-args:
     description: Extra args to pass to the planner (prefer using structured `with:` arguments unless using a custom planner!)
     required: false
@@ -14,7 +18,7 @@ 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:

dist/index.js

@@ -103177,11 +103177,13 @@ var EVENT_CLEAN_UP_DOCKER_SHIM = "clean_up_docker_shim";
 var EVENT_START_DOCKER_SHIM = "start_docker_shim";
 var EVENT_LOGIN_TO_FLAKEHUB = "login_to_flakehub";
 var EVENT_CONCLUDE_WORKFLOW = "conclude_workflow";
+var FACT_DETERMINATE_NIX = "determinate_nix";
 var FACT_HAS_DOCKER = "has_docker";
 var FACT_HAS_SYSTEMD = "has_systemd";
 var FACT_IN_ACT = "in_act";
 var FACT_IN_NAMESPACE_SO = "in_namespace_so";
 var FACT_NIX_INSTALLER_PLANNER = "nix_installer_planner";
+var FLAG_DETERMINATE = "--determinate";
 var NixInstallerAction = class extends DetSysAction {
   constructor() {
     super({
@@ -103191,12 +103193,12 @@ var NixInstallerAction = class extends DetSysAction {
       requireNix: "ignore",
       diagnosticsSuffix: "diagnostic"
     });
+    this.determinate = inputs_exports.getBool("determinate") || inputs_exports.getBool("flakehub");
     this.platform = platform_exports.getNixPlatform(platform_exports.getArchOs());
     this.nixPackageUrl = inputs_exports.getStringOrNull("nix-package-url");
     this.backtrace = inputs_exports.getStringOrNull("backtrace");
     this.extraArgs = inputs_exports.getStringOrNull("extra-args");
     this.extraConf = inputs_exports.getMultilineStringOrNull("extra-conf");
-    this.flakehub = inputs_exports.getBool("flakehub");
     this.kvm = inputs_exports.getBool("kvm");
     this.forceDockerShim = inputs_exports.getBool("force-docker-shim");
     this.githubToken = inputs_exports.getStringOrNull("github-token");
@@ -103563,15 +103565,6 @@ ${stderrBuffer}`
       }
       extraConf += "\n";
     }
-    if (this.flakehub) {
-      try {
-        const flakeHubNetrcFile = await this.flakehubLogin();
-        extraConf += `netrc-file = ${flakeHubNetrcFile}`;
-        extraConf += "\n";
-      } catch (e) {
-        core.warning(`Failed to set up FlakeHub: ${e}`);
-      }
-    }
     if (this.extraConf !== null && this.extraConf.length !== 0) {
       extraConf += this.extraConf.join("\n");
       extraConf += "\n";
@@ -103593,11 +103586,7 @@ ${stderrBuffer}`
     }
     return executionEnv;
   }
-  async executeInstall(binaryPath) {
+  get installerArgs() {
-    const executionEnv = await this.executionEnvironment();
-    core.debug(
-      `Execution environment: ${JSON.stringify(executionEnv, null, 4)}`
-    );
     const args = ["install"];
     if (this.planner) {
       this.addFact(FACT_NIX_INSTALLER_PLANNER, this.planner);
@@ -103610,8 +103599,27 @@ ${stderrBuffer}`
       const extraArgs = parseArgsStringToArgv(this.extraArgs);
       args.push(...extraArgs);
     }
+    if (this.determinate) {
+      this.addFact(FACT_DETERMINATE_NIX, true);
+      core.info(
+        `Installing Determinate Nix using the ${FLAG_DETERMINATE} flag`
+      );
+      if (!this.extraArgs) {
+        args.push(FLAG_DETERMINATE);
+      }
+      if (this.extraArgs && !this.extraArgs.includes(FLAG_DETERMINATE)) {
+        args.push(FLAG_DETERMINATE);
+      }
+    }
+    return args;
+  }
+  async executeInstall(binaryPath) {
+    const executionEnv = await this.executionEnvironment();
+    core.debug(
+      `Execution environment: ${JSON.stringify(executionEnv, null, 4)}`
+    );
     this.recordEvent(EVENT_INSTALL_NIX_START);
-    const exitCode = await exec.exec(binaryPath, args, {
+    const exitCode = await exec.exec(binaryPath, this.installerArgs, {
       env: {
         ...executionEnv,
         ...process.env
@@ -103660,6 +103668,9 @@ ${stderrBuffer}`
     if (this.forceDockerShim) {
       await this.spawnDockerShim();
     }
+    if (this.determinate) {
+      await this.flakehubLogin();
+    }
     await this.setGithubPath();
   }
   async spawnDockerShim() {
@@ -103735,6 +103746,10 @@ ${stderrBuffer}`
           dir: "/tmp",
           readOnly: false
         },
+        {
+          dir: "/usr",
+          readOnly: true
+        },
         {
           dir: "/nix",
           readOnly: false
@@ -103755,6 +103770,13 @@ ${stderrBuffer}`
           );
         }
       }
+      const plausibleDeterminateOptions = [];
+      const plausibleDeterminateArguments = [];
+      if (this.determinate) {
+        plausibleDeterminateOptions.push("--entrypoint");
+        plausibleDeterminateOptions.push("/usr/local/bin/determinate-nixd");
+        plausibleDeterminateArguments.push("daemon");
+      }
       this.recordEvent(EVENT_START_DOCKER_SHIM);
       const exitCode = await exec.exec(
         "docker",
@@ -103771,7 +103793,7 @@ ${stderrBuffer}`
           "--init",
           "--name",
           `determinate-nix-shim-${this.getUniqueId()}-${(0,external_node_crypto_namespaceObject.randomUUID)()}`
-        ].concat(mountArguments).concat(["determinate-nix-shim:latest"]),
+        ].concat(plausibleDeterminateOptions).concat(mountArguments).concat(["determinate-nix-shim:latest"]).concat(plausibleDeterminateArguments),
         {
           silent: true,
           listeners: {
@@ -103850,28 +103872,18 @@ ${stderrBuffer}`
     }
   }
   async flakehubLogin() {
-    this.recordEvent(EVENT_LOGIN_TO_FLAKEHUB);
+    if (process.env["ACTIONS_ID_TOKEN_REQUEST_URL"] && process.env["ACTIONS_ID_TOKEN_REQUEST_TOKEN"]) {
-    const netrcPath = `${process.env["RUNNER_TEMP"]}/determinate-nix-installer-netrc`;
+      core.startGroup("Logging in to FlakeHub");
-    const jwt = await core.getIDToken("api.flakehub.com");
+      this.recordEvent(EVENT_LOGIN_TO_FLAKEHUB);
-    await (0,promises_namespaceObject.writeFile)(
+      try {
-      netrcPath,
+        await exec.exec(`determinate-nixd`, ["login", "github-action"]);
-      [
+      } catch (e) {
-        `machine api.flakehub.com login flakehub password ${jwt}`,
+        this.recordEvent("flakehub-login:failure", {
-        `machine cache.flakehub.com login flakehub password ${jwt}`,
+          exception: stringifyError(e)
-        `machine flakehub.com login flakehub password ${jwt}`
+        });
-      ].join("\n")
+      }
-    );
+      core.endGroup();
-    const flakehubAuthDir = `${process.env["XDG_CONFIG_HOME"] || `${process.env["HOME"]}/.config`}/flakehub`;
-    await (0,promises_namespaceObject.mkdir)(flakehubAuthDir, { recursive: true });
-    const flakehubAuthPath = `${flakehubAuthDir}/auth`;
-    await (0,promises_namespaceObject.writeFile)(flakehubAuthPath, jwt);
-    core.info("Logging in to FlakeHub.");
-    if (this.extraConf?.join("\n").match(/^netrc-file/m)) {
-      core.warning(
-        "Logging in to FlakeHub conflicts with the Nix option `netrc-file`."
-      );
     }
-    return netrcPath;
   }
   async executeUninstall() {
     this.recordEvent(EVENT_UNINSTALL_NIX);

src/index.ts

@@ -1,7 +1,7 @@
 import * as actionsCore from "@actions/core";
 import * as github from "@actions/github";
 import * as actionsExec from "@actions/exec";
-import { access, writeFile, readFile, mkdir } from "node:fs/promises";
+import { access, readFile } from "node:fs/promises";
 import { join } from "node:path";
 import fs from "node:fs";
 import { userInfo } from "node:os";
@@ -29,12 +29,16 @@ const EVENT_LOGIN_TO_FLAKEHUB = "login_to_flakehub";
 const EVENT_CONCLUDE_WORKFLOW = "conclude_workflow";
 
 // Facts
+const FACT_DETERMINATE_NIX = "determinate_nix";
 const FACT_HAS_DOCKER = "has_docker";
 const FACT_HAS_SYSTEMD = "has_systemd";
 const FACT_IN_ACT = "in_act";
 const FACT_IN_NAMESPACE_SO = "in_namespace_so";
 const FACT_NIX_INSTALLER_PLANNER = "nix_installer_planner";
 
+// Flags
+const FLAG_DETERMINATE = "--determinate";
+
 type WorkflowConclusion =
   | "success"
   | "failure"
@@ -43,12 +47,12 @@ type WorkflowConclusion =
   | "no-jobs";
 
 class NixInstallerAction extends DetSysAction {
+  determinate: boolean;
   platform: string;
   nixPackageUrl: string | null;
   backtrace: string | null;
   extraArgs: string | null;
   extraConf: string[] | null;
-  flakehub: boolean;
   kvm: boolean;
   githubServerUrl: string | null;
   githubToken: string | null;
@@ -84,12 +88,13 @@ class NixInstallerAction extends DetSysAction {
       diagnosticsSuffix: "diagnostic",
     });
 
+    this.determinate =
+      inputs.getBool("determinate") || inputs.getBool("flakehub");
     this.platform = platform.getNixPlatform(platform.getArchOs());
     this.nixPackageUrl = inputs.getStringOrNull("nix-package-url");
     this.backtrace = inputs.getStringOrNull("backtrace");
     this.extraArgs = inputs.getStringOrNull("extra-args");
     this.extraConf = inputs.getMultilineStringOrNull("extra-conf");
-    this.flakehub = inputs.getBool("flakehub");
     this.kvm = inputs.getBool("kvm");
     this.forceDockerShim = inputs.getBool("force-docker-shim");
     this.githubToken = inputs.getStringOrNull("github-token");
@@ -519,15 +524,6 @@ class NixInstallerAction extends DetSysAction {
       }
       extraConf += "\n";
     }
-    if (this.flakehub) {
-      try {
-        const flakeHubNetrcFile = await this.flakehubLogin();
-        extraConf += `netrc-file = ${flakeHubNetrcFile}`;
-        extraConf += "\n";
-      } catch (e) {
-        actionsCore.warning(`Failed to set up FlakeHub: ${e}`);
-      }
-    }
     if (this.extraConf !== null && this.extraConf.length !== 0) {
       extraConf += this.extraConf.join("\n");
       extraConf += "\n";
@@ -553,13 +549,9 @@ class NixInstallerAction extends DetSysAction {
     return executionEnv;
   }
 
-  private async executeInstall(binaryPath: string): Promise<number> {
+  private get installerArgs(): string[] {
-    const executionEnv = await this.executionEnvironment();
-    actionsCore.debug(
-      `Execution environment: ${JSON.stringify(executionEnv, null, 4)}`,
-    );
-
     const args = ["install"];
+
     if (this.planner) {
       this.addFact(FACT_NIX_INSTALLER_PLANNER, this.planner);
       args.push(this.planner);
@@ -573,8 +565,33 @@ class NixInstallerAction extends DetSysAction {
       args.push(...extraArgs);
     }
 
+    if (this.determinate) {
+      this.addFact(FACT_DETERMINATE_NIX, true);
+
+      actionsCore.info(
+        `Installing Determinate Nix using the ${FLAG_DETERMINATE} flag`,
+      );
+
+      if (!this.extraArgs) {
+        args.push(FLAG_DETERMINATE);
+      }
+
+      if (this.extraArgs && !this.extraArgs.includes(FLAG_DETERMINATE)) {
+        args.push(FLAG_DETERMINATE);
+      }
+    }
+
+    return args;
+  }
+
+  private async executeInstall(binaryPath: string): Promise<number> {
+    const executionEnv = await this.executionEnvironment();
+    actionsCore.debug(
+      `Execution environment: ${JSON.stringify(executionEnv, null, 4)}`,
+    );
+
     this.recordEvent(EVENT_INSTALL_NIX_START);
-    const exitCode = await actionsExec.exec(binaryPath, args, {
+    const exitCode = await actionsExec.exec(binaryPath, this.installerArgs, {
       env: {
         ...executionEnv,
         ...process.env, // To get $PATH, etc
@@ -623,7 +640,6 @@ class NixInstallerAction extends DetSysAction {
       }
     }
 
-    // Normal just doing of the install
     actionsCore.startGroup("Installing Nix");
     const binaryPath = await this.fetchBinary();
     await this.executeInstall(binaryPath);
@@ -632,6 +648,11 @@ class NixInstallerAction extends DetSysAction {
     if (this.forceDockerShim) {
       await this.spawnDockerShim();
     }
+
+    if (this.determinate) {
+      await this.flakehubLogin();
+    }
+
     await this.setGithubPath();
   }
 
@@ -714,6 +735,10 @@ class NixInstallerAction extends DetSysAction {
           dir: "/tmp",
           readOnly: false,
         },
+        {
+          dir: "/usr",
+          readOnly: true,
+        },
         {
           dir: "/nix",
           readOnly: false,
@@ -737,6 +762,14 @@ class NixInstallerAction extends DetSysAction {
         }
       }
 
+      const plausibleDeterminateOptions = [];
+      const plausibleDeterminateArguments = [];
+      if (this.determinate) {
+        plausibleDeterminateOptions.push("--entrypoint");
+        plausibleDeterminateOptions.push("/usr/local/bin/determinate-nixd");
+        plausibleDeterminateArguments.push("daemon");
+      }
+
       this.recordEvent(EVENT_START_DOCKER_SHIM);
       const exitCode = await actionsExec.exec(
         "docker",
@@ -754,8 +787,10 @@ class NixInstallerAction extends DetSysAction {
           "--name",
           `determinate-nix-shim-${this.getUniqueId()}-${randomUUID()}`,
         ]
+          .concat(plausibleDeterminateOptions)
           .concat(mountArguments)
-          .concat(["determinate-nix-shim:latest"]),
+          .concat(["determinate-nix-shim:latest"])
+          .concat(plausibleDeterminateArguments),
         {
           silent: true,
           listeners: {
@@ -844,38 +879,22 @@ class NixInstallerAction extends DetSysAction {
     }
   }
 
-  async flakehubLogin(): Promise<string> {
+  async flakehubLogin(): Promise<void> {
-    this.recordEvent(EVENT_LOGIN_TO_FLAKEHUB);
+    if (
-    const netrcPath = `${process.env["RUNNER_TEMP"]}/determinate-nix-installer-netrc`;
+      process.env["ACTIONS_ID_TOKEN_REQUEST_URL"] &&
-
+      process.env["ACTIONS_ID_TOKEN_REQUEST_TOKEN"]
-    const jwt = await actionsCore.getIDToken("api.flakehub.com");
+    ) {
-
+      actionsCore.startGroup("Logging in to FlakeHub");
-    await writeFile(
+      this.recordEvent(EVENT_LOGIN_TO_FLAKEHUB);
-      netrcPath,
+      try {
-      [
+        await actionsExec.exec(`determinate-nixd`, ["login", "github-action"]);
-        `machine api.flakehub.com login flakehub password ${jwt}`,
+      } catch (e: unknown) {
-        `machine cache.flakehub.com login flakehub password ${jwt}`,
+        this.recordEvent("flakehub-login:failure", {
-        `machine flakehub.com login flakehub password ${jwt}`,
+          exception: stringifyError(e),
-      ].join("\n"),
+        });
-    );
+      }
-
+      actionsCore.endGroup();
-    const flakehubAuthDir = `${process.env["XDG_CONFIG_HOME"] || `${process.env["HOME"]}/.config`}/flakehub`;
-    await mkdir(flakehubAuthDir, { recursive: true });
-    const flakehubAuthPath = `${flakehubAuthDir}/auth`;
-
-    await writeFile(flakehubAuthPath, jwt);
-
-    actionsCore.info("Logging in to FlakeHub.");
-
-    // the join followed by a match on ^... looks silly, but extra_config
-    // could contain multi-line values
-    if (this.extraConf?.join("\n").match(/^netrc-file/m)) {
-      actionsCore.warning(
-        "Logging in to FlakeHub conflicts with the Nix option `netrc-file`.",
-      );
     }
-
-    return netrcPath;
   }
 
   async executeUninstall(): Promise<number> {