26 changed files with 165 additions and 89360 deletions
--- a/.editorconfig
+++ b/.editorconfig
@ -1,10 +1,15 @@
-# https://editorconfig.org
+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+
 root = true

 [*]
-indent_style = space
-indent_size = 2
-end_of_line = lf
 charset = utf-8
-trim_trailing_whitespace = true
+end_of_line = lf
 insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+
+[*.{yml,yaml}]
+indent_size = 2
--- a/.envrc
+++ b/.envrc
@ -1 +0,0 @@
-use flake
--- a/.eslintrc.json
+++ b/.eslintrc.json
@ -1,74 +0,0 @@
-{
-  "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
-  }
-}
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@ -5,29 +5,13 @@ on:
    branches: [main]

 jobs:
-  typescript-action:
-    runs-on: ubuntu-22.04
+  shellcheck:
+    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@main
-      - name: Enable magic Nix cache
-        uses: DeterminateSystems/magic-nix-cache-action@main
-      - name: Install pnpm dependencies
-        run: nix develop --command pnpm install
-      - name: Check formatting
-        run: nix develop --command pnpm run check-fmt
-      - name: Lint
-        run: nix develop --command pnpm run lint
-      - name: Build
-        run: nix develop --command pnpm run build
-      - name: Run test suite
-        run: nix develop --command pnpm run test
-      - name: Package
-        run: nix develop --command pnpm run package
-      - name: Check git status
-        run: git status --porcelain=v1
-      - name: Ensure no staged changes
-        run: git diff --exit-code
+        uses: cachix/install-nix-action@v17
+      - name: Shellcheck
+        run: nix-shell --run 'shellcheck $(find . -type f -name "*.sh" -executable)'
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@ -2,21 +2,18 @@ name: update-flake-lock
 on:
  workflow_dispatch:
  schedule:
-    - cron: "0 0 * * 0"
+    - cron: '0 0 * * 0'

 jobs:
  lockfile:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
+      - name: Checkout repository
+        uses: actions/checkout@v3
      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@main
-      - name: Enable magic Nix cache
-        uses: DeterminateSystems/magic-nix-cache-action@main
-      - name: Check flake
-        uses: DeterminateSystems/flake-checker-action@main
+        uses: cachix/install-nix-action@v17
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
      - name: Update flake.lock
        uses: ./.
-        with:
-          _internal-strict-mode: true
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@ -6,13 +6,13 @@ on:

 jobs:
  validate:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
        with:
          fetch-depth: 0
      - name: Validate YAML
-        uses: nwisbeta/validate-yaml-schema@v2.0.0
+        uses: nwisbeta/validate-yaml-schema@v1.0.3
        with:
          yamlSchemasJson: |
            {
--- a/.gitignore
+++ b/.gitignore
@ -1,2 +0,0 @@
-# JS dependencies
-node_modules/
--- a/.prettierignore
+++ b/.prettierignore
@ -1,5 +0,0 @@
-dist/
-lib/
-node_modules/
-pnpm-lock.yaml
-README.md
--- a/README.md
+++ b/README.md
@ -20,11 +20,14 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@main
+        uses: cachix/install-nix-action@v16
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
      - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@main
+        uses: DeterminateSystems/update-flake-lock@vX
        with:
          pr-title: "Update flake.lock" # Title of PR to be created
          pr-labels: |                  # Labels to be set on the PR
@ -50,40 +53,18 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v1
+        uses: cachix/install-nix-action@v16
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
      - name: Update flake.lock
        uses: DeterminateSystems/update-flake-lock@vX
        with:
          inputs: input1 input2 input3
 ```

-## Example adding options to nix command
-
-It is also possible to use specific options to the nix command in a space separated list:
-
-```yaml
-name: update-flake-lock
-on:
-  workflow_dispatch: # allows manual triggering
-  schedule:
-    - cron: '0 0 * * 0' # runs weekly on Sunday at 00:00
-
-jobs:
-  lockfile:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v1
-      - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@vX
-        with:
-          nix-options: --debug --log-format raw
-```
-
 ## Example that prints the number of the created PR

 ```yaml
@ -98,9 +79,12 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v1
+        uses: cachix/install-nix-action@v16
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
      - name: Update flake.lock
        id: update
        uses: DeterminateSystems/update-flake-lock@vX
@ -127,9 +111,12 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v1
+        uses: cachix/install-nix-action@v16
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
      - name: Update flake.lock
        if: ${{ github.event_name != 'pull_request' }}
        uses: DeterminateSystems/update-flake-lock@vX
@ -154,9 +141,12 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v1
+        uses: cachix/install-nix-action@v16
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
      - name: Update flake.lock
        uses: DeterminateSystems/update-flake-lock@vX
        with:
@ -185,7 +175,7 @@ git push origin update_flake_lock_action --force
 ### With a Personal Authentication Token

 By providing a Personal Authentication Token, the PR will be submitted in a way that bypasses this limitation (GitHub will essentially think it is the owner of the PAT submitting the PR, and not an Action).
-You can create a token by visiting https://github.com/settings/tokens and select at least the `repo` scope. For the new fine-grained tokens, you need to enable read and write access for "Contents" and "Pull Requests" permissions. Then, store this token in your repository secrets (i.e. `https://github.com/<USER>/<REPO>/settings/secrets/actions`) as `GH_TOKEN_FOR_UPDATES` and set up your workflow file like the following:
+You can create a token by visiting https://github.com/settings/tokens and select at least the `repo` scope. Then, store this token in your repository secrets (i.e. `https://github.com/<USER>/<REPO>/settings/secrets/actions`) as `GH_TOKEN_FOR_UPDATES` and set up your workflow file like the following:

 ```yaml
 name: update-flake-lock
@ -199,9 +189,9 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v1
+        uses: cachix/install-nix-action@v16
      - name: Update flake.lock
        uses: DeterminateSystems/update-flake-lock@vX
        with:
@ -216,7 +206,7 @@ You can follow [Github's guide on creating and/or adding a new GPG key to an use

 For the bot to produce signed commits, you will have to provide the GPG private keys to this action's input parameters. You can safely do that with [Github secrets as explained here](https://github.com/crazy-max/ghaction-import-gpg#prerequisites).

-When using commit signing, the commit author name and email for the commits produced by this bot would correspond to the ones associated to the GPG Public Key.
+When using commit signing, the commit author name and email for the commits produced by this bot would correspond to the ones associated to the GPG Public Key. 

 If you want to sign using a subkey, you must specify the subkey fingerprint using the `gpg-fingerprint` input parameter.

@ -234,9 +224,9 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v1
+        uses: cachix/install-nix-action@v16
      - name: Update flake.lock
        uses: DeterminateSystems/update-flake-lock@vX
        with:
@ -279,33 +269,6 @@ However you can customize it, with variable interpolation performed with [Handle
 - env.GIT_COMMITTER_EMAIL
 - env.GIT_COMMIT_MESSAGE

-## Add assignees or reviewers
-
-You can assign the PR to or request a review from one or more GitHub users with `pr-assignees` and `pr-reviewers`, respectively.
-These properties expect a comma or newline separated list of GitHub usernames:
-
-```yaml
-name: update-flake-lock
-on:
-  workflow_dispatch: # allows manual triggering
-  schedule:
-    - cron: '0 0 * * 1,4' # Run twice a week
-
-jobs:
-  lockfile:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v1
-      - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@vX
-        with:
-          pr-assignees: SomeGitHubUsername
-          pr-reviewers: SomeOtherGitHubUsername,SomeThirdGitHubUsername
-```
-
 ## Contributing

 Feel free to send a PR or open an issue if you find something functions unexpectedly! Please make sure to test your changes and update any related documentation before submitting your PR.
--- a/action.yml
+++ b/action.yml
@ -1,34 +1,32 @@
-name: "Update Nix Flake Lock"
-description: "Update your Nix flake.lock and send a PR"
+name: 'Update flake.lock'
+description: 'Update your flake.lock and send a PR'
 inputs:
  inputs:
-    description: "A space-separated list of inputs to update. Leave empty to update all inputs."
+    description: 'A space-separated list of inputs to update. Leave empty to update all inputs.'
    required: false
-    default: ""
+    default: ''
  token:
-    description: "GITHUB_TOKEN or a `repo` scoped Personal Access Token (PAT)"
+    description: 'GITHUB_TOKEN or a `repo` scoped Personal Access Token (PAT)'
    required: false
    default: ${{ github.token }}
  commit-msg:
-    description: "The message provided with the commit"
+    description: 'The message provided with the commit'
    required: false
    default: "flake.lock: Update"
-  base:
-    description: "Sets the pull request base branch. Defaults to the branch checked out in the workflow."
-    required: false
  branch:
-    description: "The branch of the PR to be created"
+    description: 'The branch of the PR to be created'
    required: false
    default: "update_flake_lock_action"
  path-to-flake-dir:
-    description: "The path of the directory containing `flake.nix` file within your repository. Useful when `flake.nix` cannot reside at the root of your repository."
+    description: 'The path of the directory containing `flake.nix` file within your repository. Useful when `flake.nix` cannot reside at the root of your repository.'
    required: false
+    default: ''
  pr-title:
-    description: "The title of the PR to be created"
+    description: 'The title of the PR to be created'
    required: false
    default: "flake.lock: Update"
  pr-body:
-    description: "The body of the PR to be created"
+    description: 'The body of the PR to be created'
    required: false
    default: |
      Automated changes by the [update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock) GitHub Action.
@ -52,76 +50,54 @@ inputs:
      ```

  pr-labels:
-    description: "A comma or newline separated list of labels to set on the Pull Request to be created"
+    description: 'A comma or newline separated list of labels to set on the Pull Request to be created'
    required: false
-    default: ""
-  pr-assignees:
-    description: "A comma or newline separated list of assignees (GitHub usernames)."
-    required: false
-    default: ""
-  pr-reviewers:
-    description: "A comma or newline separated list of reviewers (GitHub usernames) to request a review from."
-    required: false
-    default: ""
+    default: ''
  git-author-name:
-    description: "Author name used for commit. Only used if sign-commits is false."
+    description: 'Author name used for commit. Only used if sign-commits is false.'
    required: false
-    default: "github-actions[bot]"
+    default: 'github-actions[bot]'
  git-author-email:
-    description: "Author email used for commit. Only used if sign-commits is false."
+    description: 'Author email used for commit. Only used if sign-commits is false.'
    required: false
-    default: "github-actions[bot]@users.noreply.github.com"
+    default: 'github-actions[bot]@users.noreply.github.com'
  git-committer-name:
-    description: "Committer name used for commit. Only used if sign-commits is false."
+    description: 'Committer name used for commit. Only used if sign-commits is false.'
    required: false
-    default: "github-actions[bot]"
+    default: 'github-actions[bot]'
  git-committer-email:
-    description: "Committer email used for commit. Only used if sign-commits is false."
+    description: 'Committer email used for commit. Only used if sign-commits is false.'
    required: false
-    default: "github-actions[bot]@users.noreply.github.com"
+    default: 'github-actions[bot]@users.noreply.github.com'
  sign-commits:
-    description: "Set to true if the action should sign the commit with GPG"
+    description: 'Set to true if the action should sign the commit with GPG'
    required: false
-    default: "false"
+    default: 'false'
  gpg-private-key:
-    description: "GPG Private Key with which to sign the commits in the PR to be created"
+    description: 'GPG Private Key with which to sign the commits in the PR to be created'
    required: false
-    default: ""
+    default: ''
  gpg-fingerprint:
-    description: "Fingerprint of specific GPG subkey to use"
+    description: 'Fingerprint of specific GPG subkey to use'
    required: false
  gpg-passphrase:
-    description: "GPG Private Key Passphrase for the GPG Private Key with which to sign the commits in the PR to be created"
+    description: 'GPG Private Key Passphrase for the GPG Private Key with which to sign the commits in the PR to be created'
    required: false
-    default: ""
-  nix-options:
-    description: "A space-separated list of options to pass to the nix command"
-    required: false
-    default: ""
-  _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
+    default: ''
 outputs:
  pull-request-number:
-    description: "The number of the opened pull request"
+    description: 'The number of the opened pull request'
    value: ${{ steps.create-pr.outputs.pull-request-number }}
-  pull-request-url:
-    description: "The The URL of the opened pull request."
-    value: ${{ steps.create-pr.outputs.pull-request-url }}
-  pull-request-operation:
-    description: "The pull request operation performed by the action, `created`, `updated` or `closed`."
-    value: ${{ steps.create-pr.outputs.pull-request-operation }}
 runs:
  using: "composite"
  steps:
    - name: Import bot's GPG key for signing commits
      if: ${{ inputs.sign-commits == 'true' }}
      id: import-gpg
-      uses: crazy-max/ghaction-import-gpg@01dd5d3ca463c7f10f7f4f7b4f177225ac661ee4 # v6.1.0
+      uses: crazy-max/ghaction-import-gpg@v5
      with:
        gpg_private_key: ${{ inputs.gpg-private-key }}
-        fingerprint: ${{ inputs.gpg-fingerprint }}
+        fingerprint: ${{ inputs.gpg-fingerprint }}
        passphrase: ${{ inputs.gpg-passphrase }}
        git_config_global: true
        git_user_signingkey: true
@ -148,37 +124,19 @@ runs:
        echo "GIT_AUTHOR_EMAIL=<${{ inputs.git-author-email }}>" >> $GITHUB_ENV
        echo "GIT_COMMITTER_NAME=${{ inputs.git-committer-name }}" >> $GITHUB_ENV
        echo "GIT_COMMITTER_EMAIL=<${{ inputs.git-committer-email }}>" >> $GITHUB_ENV
-    - name: Run update-flake-lock
+    - name: Run update-flake-lock.sh
+      run: $GITHUB_ACTION_PATH/update-flake-lock.sh
      shell: bash
-      run: node "$GITHUB_ACTION_PATH/dist/index.js"
      env:
-        # The following manually exposes all of the action inputs into INPUT_ environment variables so actionsCore.getInput works:
-        # https://github.com/actions/toolkit/blob/ae38557bb0dba824cdda26ce787bd6b66cf07a83/packages/core/src/core.ts#L126
-        INPUT_BASE: ${{ inputs.base }}
-        INPUT_BRANCH: ${{ inputs.branch }}
-        INPUT_COMMIT-MSG: ${{ inputs.commit-msg }}
-        INPUT_GIT-AUTHOR-EMAIL: ${{ inputs.git-author-email }}
-        INPUT_GIT-AUTHOR-NAME: ${{ inputs.git-author-name }}
-        INPUT_GIT-COMMITTER-EMAIL: ${{ inputs.git-committer-email }}
-        INPUT_GIT-COMMITTER-NAME: ${{ inputs.git-committer-name }}
-        INPUT_GPG-FINGERPRINT: ${{ inputs.gpg-fingerprint }}
-        INPUT_GPG-PASSPHRASE: ${{ inputs.gpg-passphrase }}
-        INPUT_GPG-PRIVATE-KEY: ${{ inputs.gpg-private-key }}
-        INPUT_INPUTS: ${{ inputs.inputs }}
-        INPUT_NIX-OPTIONS: ${{ inputs.nix-options }}
-        INPUT_PATH-TO-FLAKE-DIR: ${{ inputs.path-to-flake-dir }}
-        INPUT_PR-ASSIGNEES: ${{ inputs.pr-assignees }}
-        INPUT_PR-BODY: ${{ inputs.pr-body }}
-        INPUT_PR-LABELS: ${{ inputs.pr-labels }}
-        INPUT_PR-REVIEWERS: ${{ inputs.pr-reviewers }}
-        INPUT_PR-TITLE: ${{ inputs.pr-title }}
-        INPUT_PULL-REQUEST-NUMBER: ${{ inputs.pull-request-number }}
-        INPUT_PULL-REQUEST-OPERATION: ${{ inputs.pull-request-operation }}
-        INPUT_SIGN-COMMITS: ${{ inputs.sign-commits }}
-        INPUT_TOKEN: ${{ inputs.token }}
-        INPUT__INTERNAL-STRICT-MODE: ${{ inputs._internal-strict-mode }}
+        GIT_AUTHOR_NAME: ${{ env.GIT_AUTHOR_NAME }}
+        GIT_AUTHOR_EMAIL: ${{ env.GIT_AUTHOR_EMAIL }}
+        GIT_COMMITTER_NAME: ${{ env.GIT_COMMITTER_NAME }}
+        GIT_COMMITTER_EMAIL: ${{ env.GIT_COMMITTER_EMAIL }}
+        TARGETS: ${{ inputs.inputs }}
+        COMMIT_MSG: ${{ inputs.commit-msg }}
+        PATH_TO_FLAKE_DIR: ${{ inputs.path-to-flake-dir }}
    - name: Save PR Body as file
-      uses: DamianReeves/write-file-action@v1.3
+      uses: DamianReeves/write-file-action@v1.1
      with:
        path: pr_body.template
        contents: ${{ inputs.pr-body }}
@ -186,20 +144,20 @@ runs:
    - name: Set additional env variables (GIT_COMMIT_MESSAGE)
      shell: bash
      run: |
-        DELIMITER=$(dd if=/dev/urandom bs=15 count=1 status=none | base64)
-        COMMIT_MESSAGE="$(git log --format=%b -n 1)"
-        echo "GIT_COMMIT_MESSAGE<<$DELIMITER" >> $GITHUB_ENV
-        echo "$COMMIT_MESSAGE" >> $GITHUB_ENV
-        echo "$DELIMITER" >> $GITHUB_ENV
-        echo "GIT_COMMIT_MESSAGE is: ${COMMIT_MESSAGE}"
+        GIT_COMMIT_MESSAGE="$(git log --format=%b -n 1)"
+        GIT_COMMIT_MESSAGE="${GIT_COMMIT_MESSAGE//'%'/'%25'}"
+        GIT_COMMIT_MESSAGE="${GIT_COMMIT_MESSAGE//$'\n'/'%0A'}"
+        GIT_COMMIT_MESSAGE="${GIT_COMMIT_MESSAGE//$'\r'/'%0D'}"
+        echo "GIT_COMMIT_MESSAGE=$GIT_COMMIT_MESSAGE" >> $GITHUB_ENV
+        echo "GIT_COMMIT_MESSAGE is: ${GIT_COMMIT_MESSAGE}"
    - name: Interpolate PR Body
-      uses: pedrolamas/handlebars-action@2995d7eadacbc8f2f6ab8431a01d84a5fa3b8bb4 # v2.4.0
+      uses: pedrolamas/handlebars-action@v2.0.0
      with:
-        files: "pr_body.template"
-        output-filename: "pr_body.txt"
+        files: 'pr_body.template'
+        output-filename: 'pr_body.txt'
    - name: Read pr_body.txt
      id: pr_body
-      uses: juliangruber/read-file-action@v1
+      uses: andstor/file-reader-action@v1
      with:
        path: "pr_body.txt"
    # We need to remove the pr_body files so that the
@ -210,17 +168,13 @@ runs:
      run: rm -f pr_body.txt pr_body.template
    - name: Create PR
      id: create-pr
-      # uses: peter-evans/create-pull-request@main
-      uses: peter-evans/create-pull-request@v6.0.1
+      uses: peter-evans/create-pull-request@v3
      with:
-        base: "${{ inputs.base }}"
-        branch: "${{ inputs.branch }}"
+        branch: ${{ inputs.branch }}
        delete-branch: true
-        committer: "${{ env.GIT_COMMITTER_NAME }} ${{ env.GIT_COMMITTER_EMAIL }}"
-        author: "${{ env.GIT_AUTHOR_NAME }} ${{ env.GIT_AUTHOR_EMAIL }}"
-        title: "${{ inputs.pr-title }}"
-        token: "${{ inputs.token }}"
-        assignees: "${{ inputs.pr-assignees }}"
-        labels: "${{ inputs.pr-labels }}"
-        reviewers: "${{ inputs.pr-reviewers }}"
-        body: "${{ steps.pr_body.outputs.content }}"
+        committer: ${{ env.GIT_COMMITTER_NAME }} ${{ env.GIT_COMMITTER_EMAIL }}
+        author: ${{ env.GIT_AUTHOR_NAME }} ${{ env.GIT_AUTHOR_EMAIL }}
+        title: ${{ inputs.pr-title }}
+        token: ${{ inputs.token }}
+        labels: ${{ inputs.pr-labels }}
+        body: ${{ steps.pr_body.outputs.contents }}
--- a/dist/index.d.ts
+++ b/dist/index.d.ts
@ -1,2 +0,0 @@
-
-export {  }
--- a/dist/index.js
+++ b/dist/index.js
--- a/dist/index.js.map
+++ b/dist/index.js.map
--- a/dist/package.json
+++ b/dist/package.json
@ -1,3 +0,0 @@
-{
-  "type": "module"
-}
--- a/flake.lock
+++ b/flake.lock
@ -2,16 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1713537308,
-        "narHash": "sha256-XtTSSIB2DA6tOv+l0FhvfDMiyCmhoRbNB+0SeInZkbk=",
-        "rev": "5c24cf2f0a12ad855f444c30b2421d044120c66f",
-        "revCount": 614481,
-        "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.614481%2Brev-5c24cf2f0a12ad855f444c30b2421d044120c66f/018efa00-a443-7f41-b371-ce568b5c7e9f/source.tar.gz"
+        "lastModified": 1659131907,
+        "narHash": "sha256-8bz4k18M/FuVC+EVcI4aREN2PsEKT7LGmU2orfjnpCg=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "8d435fca5c561da8168abb30270788d2da2a7951",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/flake.nix
+++ b/flake.nix
@ -1,23 +1,30 @@
 {
  description = "update-flake-lock";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";

-  outputs = { self, nixpkgs }:
+  outputs =
+    { self
+    , nixpkgs
+    }:
    let
-      supportedSystems = [ "x86_64-linux" "aarch64-darwin" "aarch64-linux" "x86_64-darwin" ];
-      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
-        pkgs = import nixpkgs { inherit system; };
-      });
+      nameValuePair = name: value: { inherit name value; };
+      genAttrs = names: f: builtins.listToAttrs (map (n: nameValuePair n (f n)) names);
+
+      allSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forAllSystems = f: genAttrs allSystems
+        (system: f {
+          inherit system;
+          pkgs = import nixpkgs { inherit system; };
+        });
    in
    {
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          packages = with pkgs; [
-            nodejs_latest
-            nodePackages_latest.pnpm
-          ];
-        };
-      });
+      devShell = forAllSystems
+        ({ system, pkgs, ... }:
+          pkgs.stdenv.mkDerivation {
+            name = "update-flake-lock-devshell";
+            buildInputs = [ pkgs.shellcheck ];
+            src = self;
+          });
    };
 }
--- a/package.json
+++ b/package.json
@ -1,47 +0,0 @@
-{
-  "name": "update-flake-lock",
-  "version": "1.0.0",
-  "description": "",
-  "main": "./dist/index.js",
-  "types": "./dist/index.d.ts",
-  "type": "module",
-  "scripts": {
-    "build": "tsup",
-    "format": "prettier --write .",
-    "check-fmt": "prettier --check .",
-    "lint": "eslint src/**/*.ts --ignore-pattern *.test.ts",
-    "package": "ncc build",
-    "test": "vitest --watch false",
-    "all": "pnpm run format && pnpm run lint && pnpm run build && pnpm run package"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/DeterminateSystems/update-flake-lock.git"
-  },
-  "keywords": [],
-  "author": "",
-  "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/DeterminateSystems/update-flake-lock/issues"
-  },
-  "homepage": "https://github.com/DeterminateSystems/update-flake-lock#readme",
-  "dependencies": {
-    "@actions/core": "^1.11.1",
-    "@actions/exec": "^1.1.1",
-    "detsys-ts": "github:DeterminateSystems/detsys-ts"
-  },
-  "devDependencies": {
-    "@trivago/prettier-plugin-sort-imports": "^4.3.0",
-    "@typescript-eslint/eslint-plugin": "^7.18.0",
-    "@vercel/ncc": "^0.38.3",
-    "eslint": "^8.57.1",
-    "eslint-import-resolver-typescript": "^3.6.3",
-    "eslint-plugin-github": "^4.10.2",
-    "eslint-plugin-import": "^2.31.0",
-    "eslint-plugin-prettier": "^5.2.1",
-    "prettier": "^3.3.3",
-    "tsup": "^8.3.5",
-    "typescript": "^5.6.3",
-    "vitest": "^1.6.0"
-  }
-}
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
--- a/prettier.config.cjs
+++ b/prettier.config.cjs
@ -1,12 +0,0 @@
-/** @type {import('prettier').Config} */
-module.exports = {
-  plugins: [require.resolve("@trivago/prettier-plugin-sort-imports")],
-  semi: true,
-  singleQuote: false,
-  tabWidth: 2,
-  trailingComma: "all",
-  useTabs: false,
-  // Import sorting
-  importOrderSeparation: true,
-  importOrderSortSpecifiers: true,
-};
--- a/src/index.ts
+++ b/src/index.ts
@ -1,76 +0,0 @@
-import { makeNixCommandArgs } from "./nix.js";
-import * as actionsCore from "@actions/core";
-import * as actionsExec from "@actions/exec";
-import { DetSysAction, inputs } from "detsys-ts";
-
-const EVENT_EXECUTION_FAILURE = "execution_failure";
-
-class UpdateFlakeLockAction extends DetSysAction {
-  private commitMessage: string;
-  private nixOptions: string[];
-  private flakeInputs: string[];
-  private pathToFlakeDir: string | null;
-
-  constructor() {
-    super({
-      name: "update-flake-lock",
-      fetchStyle: "universal",
-      requireNix: "fail",
-    });
-
-    this.commitMessage = inputs.getString("commit-msg");
-    this.flakeInputs = inputs.getArrayOfStrings("inputs", "space");
-    this.nixOptions = inputs.getArrayOfStrings("nix-options", "space");
-    this.pathToFlakeDir = inputs.getStringOrNull("path-to-flake-dir");
-  }
-
-  async main(): Promise<void> {
-    await this.update();
-  }
-
-  // No post phase
-  async post(): Promise<void> {}
-
-  async update(): Promise<void> {
-    // Nix command of this form:
-    // nix ${maybe nix options} flake ${"update" or "lock"} ${maybe --update-input flags} --commit-lock-file --commit-lockfile-summary ${commit message}
-    // Example commands:
-    // nix --extra-substituters https://example.com flake lock --update-input nixpkgs --commit-lock-file --commit-lockfile-summary "updated flake.lock"
-    // nix flake update --commit-lock-file --commit-lockfile-summary "updated flake.lock"
-    const nixCommandArgs: string[] = makeNixCommandArgs(
-      this.nixOptions,
-      this.flakeInputs,
-      this.commitMessage,
-    );
-
-    actionsCore.debug(
-      JSON.stringify({
-        options: this.nixOptions,
-        inputs: this.flakeInputs,
-        message: this.commitMessage,
-        args: nixCommandArgs,
-      }),
-    );
-
-    const execOptions: actionsExec.ExecOptions = {
-      cwd: this.pathToFlakeDir !== null ? this.pathToFlakeDir : undefined,
-    };
-
-    const exitCode = await actionsExec.exec("nix", nixCommandArgs, execOptions);
-
-    if (exitCode !== 0) {
-      this.recordEvent(EVENT_EXECUTION_FAILURE, {
-        exitCode,
-      });
-      actionsCore.setFailed(`non-zero exit code of ${exitCode} detected`);
-    } else {
-      actionsCore.info(`flake.lock file was successfully updated`);
-    }
-  }
-}
-
-function main(): void {
-  new UpdateFlakeLockAction().execute();
-}
-
-main();
--- a/src/nix.test.ts
+++ b/src/nix.test.ts
@ -1,77 +0,0 @@
-import { makeNixCommandArgs } from "./nix.js";
-import { expect, test } from "vitest";
-
-type TestCase = {
-  inputs: {
-    nixOptions: string[];
-    flakeInputs: string[];
-    commitMessage: string;
-  };
-  expected: string[];
-};
-
-test("Nix command arguments", () => {
-  const testCases: TestCase[] = [
-    {
-      inputs: {
-        nixOptions: ["--log-format", "raw"],
-        flakeInputs: [],
-        commitMessage: "just testing",
-      },
-      expected: [
-        "--log-format",
-        "raw",
-        "flake",
-        "update",
-        "--commit-lock-file",
-        "--option",
-        "commit-lockfile-summary",
-        "just testing",
-      ],
-    },
-    {
-      inputs: {
-        nixOptions: [],
-        flakeInputs: ["nixpkgs", "rust-overlay"],
-        commitMessage: "just testing",
-      },
-      expected: [
-        "flake",
-        "lock",
-        "--update-input",
-        "nixpkgs",
-        "--update-input",
-        "rust-overlay",
-        "--commit-lock-file",
-        "--option",
-        "commit-lockfile-summary",
-        "just testing",
-      ],
-    },
-    {
-      inputs: {
-        nixOptions: ["--debug"],
-        flakeInputs: [],
-        commitMessage: "just testing",
-      },
-      expected: [
-        "--debug",
-        "flake",
-        "update",
-        "--commit-lock-file",
-        "--option",
-        "commit-lockfile-summary",
-        "just testing",
-      ],
-    },
-  ];
-
-  testCases.forEach(({ inputs, expected }) => {
-    const args = makeNixCommandArgs(
-      inputs.nixOptions,
-      inputs.flakeInputs,
-      inputs.commitMessage,
-    );
-    expect(args).toStrictEqual(expected);
-  });
-});
--- a/src/nix.ts
+++ b/src/nix.ts
@ -1,31 +0,0 @@
-// Build the Nix args out of inputs from the Actions environment
-export function makeNixCommandArgs(
-  nixOptions: string[],
-  flakeInputs: string[],
-  commitMessage: string,
-): string[] {
-  const flakeInputFlags = flakeInputs.flatMap((input) => [
-    "--update-input",
-    input,
-  ]);
-
-  // NOTE(cole-h): In Nix versions 2.23.0 and later, `commit-lockfile-summary` became an alias to
-  // the setting `commit-lock-file-summary` (https://github.com/NixOS/nix/pull/10691), and Nix does
-  // not treat aliases the same as their "real" setting by requiring setting aliases to be
-  // configured via `--option <alias name> <option value>`
-  // (https://github.com/NixOS/nix/issues/10989).
-  // So, we go the long way so that we can support versions both before and after Nix 2.23.0.
-  const lockfileSummaryFlags = [
-    "--option",
-    "commit-lockfile-summary",
-    commitMessage,
-  ];
-
-  const updateLockMechanism = flakeInputFlags.length === 0 ? "update" : "lock";
-
-  return nixOptions
-    .concat(["flake", updateLockMechanism])
-    .concat(flakeInputFlags)
-    .concat(["--commit-lock-file"])
-    .concat(lockfileSummaryFlags);
-}
--- a/0
+++ b/0
--- a/tsconfig.json
+++ b/tsconfig.json
@ -1,15 +0,0 @@
-{
-  "compilerOptions": {
-    "target": "ES2020" /* 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", "**/*.test.ts", "dist"]
-}
--- a/tsup.config.ts
+++ b/tsup.config.ts
@ -1,16 +0,0 @@
-import { name } from "./package.json";
-import { defineConfig } from "tsup";
-
-export default defineConfig({
-  name,
-  entry: ["src/index.ts"],
-  format: ["esm"],
-  target: "node20",
-  bundle: true,
-  splitting: false,
-  sourcemap: true,
-  clean: true,
-  dts: {
-    resolve: true,
-  },
-});
--- a/update-flake-lock.sh
+++ b/update-flake-lock.sh
@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ -n "$PATH_TO_FLAKE_DIR" ]]; then
+  cd "$PATH_TO_FLAKE_DIR"
+fi
+
+if [[ -n "$TARGETS" ]]; then
+    inputs=()
+    for input in $TARGETS; do
+        inputs+=("--update-input" "$input")
+    done
+    nix flake lock "${inputs[@]}" --commit-lock-file --commit-lockfile-summary "$COMMIT_MSG"
+else
+    nix flake update --commit-lock-file --commit-lockfile-summary "$COMMIT_MSG"
+fi