Merge pull request #9 from actions/devm33/check-write

Add step to warn about unnecessary write permissions

.github/workflows/release.yml

@@ -0,0 +1,73 @@
+name: Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      bump:
+        description: Version bump type
+        required: true
+        default: patch
+        type: choice
+        options:
+          - patch
+          - minor
+          - major
+
+jobs:
+  release:
+    runs-on: ubuntu-slim
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Determine new version
+        id: version
+        run: |
+          # Get the latest semver tag
+          LATEST_TAG=$(git tag --list 'v[0-9]*.[0-9]*.[0-9]*' --sort=-v:refname | head -n1)
+          if [ -z "$LATEST_TAG" ]; then
+            echo "No existing version tag found"
+            exit 1
+          fi
+
+          # Strip leading 'v' and split into components
+          VERSION="${LATEST_TAG#v}"
+          IFS='.' read -r MAJOR MINOR PATCH <<< "$VERSION"
+
+          case "${{ inputs.bump }}" in
+            major)
+              MAJOR=$((MAJOR + 1))
+              MINOR=0
+              PATCH=0
+              ;;
+            minor)
+              MINOR=$((MINOR + 1))
+              PATCH=0
+              ;;
+            patch)
+              PATCH=$((PATCH + 1))
+              ;;
+          esac
+
+          NEW_VERSION="v${MAJOR}.${MINOR}.${PATCH}"
+          echo "previous=$LATEST_TAG" >> "$GITHUB_OUTPUT"
+          echo "new=$NEW_VERSION" >> "$GITHUB_OUTPUT"
+          echo "major=v${MAJOR}" >> "$GITHUB_OUTPUT"
+          echo "Bumping $LATEST_TAG -> $NEW_VERSION"
+
+      - name: Create GitHub release
+        run: |
+          gh release create "${{ steps.version.outputs.new }}" \
+            --generate-notes \
+            --notes-start-tag "${{ steps.version.outputs.previous }}"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Update major version tag
+        run: |
+          git fetch origin tag "${{ steps.version.outputs.new }}"
+          git tag -f "${{ steps.version.outputs.major }}" "${{ steps.version.outputs.new }}"
+          git push -f origin "${{ steps.version.outputs.major }}"

CODE_OF_CONDUCT.md

@@ -0,0 +1,76 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to make participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies within all project spaces, and it also applies when
+an individual is representing the project or its community in public spaces.
+Examples of representing a project or community include using an official
+project e-mail address, posting via an official social media account, or acting
+as an appointed representative at an online or offline event. Representation of
+a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at opensource@github.com. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

CONTRIBUTING.md

@@ -0,0 +1,30 @@
+## Contributing
+
+[fork]: https://github.com/actions/setup-copilot/fork
+[pr]: https://github.com/actions/setup-copilot/compare
+
+Hi there! We're thrilled that you'd like to contribute to this project. Your help is essential for keeping it great.
+
+Contributions to this project are [released](https://help.github.com/articles/github-terms-of-service/#6-contributions-under-repository-license) to the public under the [project's open source license](LICENSE.txt).
+
+Please note that this project is released with a [Contributor Code of Conduct](CODE_OF_CONDUCT.md). By participating in this project you agree to abide by its terms.
+
+## Submitting a pull request
+
+1. [Fork][fork] and clone the repository
+1. Create a new branch: `git checkout -b my-branch-name`
+1. Make your change, add tests, and make sure the tests and linter still pass
+1. Push to your fork and [submit a pull request][pr]
+1. Pat yourself on the back and wait for your pull request to be reviewed and merged.
+
+Here are a few things you can do that will increase the likelihood of your pull request being accepted:
+
+- Write tests.
+- Keep your change as focused as possible. If there are multiple changes you would like to make that are not dependent upon each other, consider submitting them as separate pull requests.
+- Write a [good commit message](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
+
+## Resources
+
+- [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)
+- [Using Pull Requests](https://help.github.com/articles/about-pull-requests/)
+- [GitHub Help](https://help.github.com)

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2026 GitHub
+Copyright GitHub, Inc.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -6,10 +6,10 @@ A GitHub Action to install the [GitHub Copilot CLI](https://github.com/github/co
 
 ```yaml
 steps:
-  - uses: actions/setup-copilot@v1
+  - uses: actions/setup-copilot@v0
     with:
       version: "latest" # optional, defaults to "latest"
-      github-token: ${{ secrets.COPILOT_TOKEN }} # optional, defaults to github.token
+      github-token: ${{ secrets.GITHUB_TOKEN }} # optional, defaults to github.token
   - run: copilot --version
 ```
 
@@ -18,7 +18,7 @@ steps:
 | Input          | Description                                       | Required | Default          |
 | -------------- | ------------------------------------------------- | -------- | ---------------- |
 | `version`      | Version to install (`latest`, `prerelease`, or a specific version like `1.0.0`) | No | `latest` |
-| `github-token` | GitHub token for Copilot authentication           | No       | `github.token`   |
+| `github-token` | GitHub token for downloading Copilot CLI          | No       | `github.token`   |
 
 ## Outputs
 
@@ -31,13 +31,13 @@ steps:
 ### Install latest version
 
 ```yaml
-- uses: actions/setup-copilot@v1
+- uses: actions/setup-copilot@v0
 ```
 
 ### Install a specific version
 
 ```yaml
-- uses: actions/setup-copilot@v1
+- uses: actions/setup-copilot@v0
   with:
     version: "1.2.3"
 ```
@@ -45,9 +45,9 @@ steps:
 ### Use with a custom token
 
 ```yaml
-- uses: actions/setup-copilot@v1
+- uses: actions/setup-copilot@v0
   with:
-    github-token: ${{ secrets.COPILOT_TOKEN }}
+    github-token: ${{ secrets.GH_TOKEN }}
 ```
 
 ## How it works
@@ -57,3 +57,11 @@ This action uses the [official Copilot CLI install script](https://gh.io/copilot
 ## License
 
 [MIT](LICENSE)
+
+## Contributions
+
+Contributions are welcome! See [Contributor's Guide](CONTRIBUTING.md)
+
+## Code of Conduct
+
+:wave: Be nice. See [our code of conduct](CODE_OF_CONDUCT.md)

action.yml

@@ -10,7 +10,7 @@ inputs:
     required: false
     default: "latest"
   github-token:
-    description: "GitHub token for Copilot authentication. Defaults to the workflow token."
+    description: "GitHub token to download Copilot CLI. Defaults to the workflow token."
     required: false
     default: ${{ github.token }}
 
@@ -27,17 +27,64 @@ runs:
       env:
         VERSION: ${{ inputs.version }}
         PREFIX: ${{ runner.tool_cache }}/copilot
+        GITHUB_TOKEN: ${{ inputs.github-token }}
       run: curl -fsSL https://gh.io/copilot-install | bash
 
     - name: Add to PATH
       shell: bash
       run: echo "${{ runner.tool_cache }}/copilot/bin" >> "$GITHUB_PATH"
 
-    - name: Set GITHUB_TOKEN
+    - name: Check for unnecessary write permissions
       shell: bash
       env:
         GH_TOKEN: ${{ inputs.github-token }}
-      run: echo "GITHUB_TOKEN=${GH_TOKEN}" >> "$GITHUB_ENV"
+      run: |
+        API="$GITHUB_API_URL/repos/$GITHUB_REPOSITORY"
+        writes_found=()
+
+        # Probe write access by sending invalid requests to write endpoints.
+        # 422/409 = token has write permission (passed auth, failed validation)
+        # 403     = token does not have write permission
+        probe_write() {
+          local scope="$1" url="$2" method="${3:-POST}" body="${4:-\{\}}"
+          code=$(curl -s -o /dev/null -w "%{http_code}" \
+            -X "$method" \
+            -H "Authorization: bearer $GH_TOKEN" \
+            -H "Accept: application/vnd.github+json" \
+            "$url" -d "$body")
+          case "$code" in
+            2[0-9][0-9]|422|409) writes_found+=("$scope") ;;
+          esac
+        }
+
+        probe_write "actions"         "$API/actions/workflows/0/dispatches" POST '{"ref":"__probe__"}'
+        probe_write "checks"          "$API/check-runs"                     POST '{}'
+        probe_write "contents"        "$API/contents/__probe__"             PUT  '{"message":"probe"}'
+        probe_write "deployments"     "$API/deployments"                    POST '{}'
+        probe_write "issues"          "$API/issues"                         POST '{}'
+        probe_write "packages"        "$GITHUB_API_URL/user/packages/container/__nonexistent__/versions/0" DELETE ''
+        probe_write "pages"           "$API/pages"                          POST '{}'
+        probe_write "pull-requests"   "$API/pulls"                          POST '{}'
+        probe_write "statuses"        "$API/statuses/$GITHUB_SHA"           POST '{}'
+
+        if [ ${#writes_found[@]} -gt 0 ]; then
+          echo ""
+          echo "::warning::⚠️  The github-token passed to setup-copilot has write permissions: ${writes_found[*]}. Granting write permissions to the Copilot CLI in Actions workflows is a security risk. Recommend scoping your token with least-privilege permissions."
+          {
+            echo "### ⚠️ setup-copilot: Excessive Token Permissions"
+            echo ""
+            echo "The \`github-token\` input has **write** access to: \`${writes_found[*]}\`."
+            echo ""
+            echo "Giving write permissions to the Copilot CLI in Actions workflows is a security risk."
+            echo ""
+            echo "**Recommendation:** add a \`permissions\` block to your job:"
+            echo '```yaml'
+            echo "permissions:"
+            echo "  contents: read"
+            echo '```'
+            echo "and add a separate job with write permissions for steps that need it."
+          } >> "$GITHUB_STEP_SUMMARY"
+        fi
 
     - name: Verify installation
       id: version