dependencies.yml

# Automatically run `cargo update` periodically.
#
# Originally based on
# [Rust's own dependency-upgrading workflow](https://github.com/rust-lang/rust/blob/master/.github/workflows/dependencies.yml)
# and subsequently adapted to the needs of this project.
# Rust source code may be used under the terms of the MIT or Apache 2.0 licenses,
# which we do here.

---
name: Bump dependencies in Cargo.lock
on:
  schedule:
    # Run weekly early in the morning on Mondays.
    - cron: '37 03 * * MON'
  workflow_dispatch:
    # Needed so we can run it manually
permissions:
  contents: read
defaults:
  run:
    shell: bash
env:
  PR_TITLE: Weekly `cargo update` of dependencies
  PR_MESSAGE: |
    Automation to keep dependencies in `Cargo.lock` current.

    The following is the output from `cargo update`:
  COMMIT_MESSAGE: "cargo update \n\n"

jobs:
  update-cargo:
    if: github.repository_owner == 'obi1kenobi'
    name: update dependencies
    runs-on: ubuntu-latest
    steps:
      - name: checkout the source code
        uses: actions/checkout@v4
        with:
          persist-credentials: false

      - name: Install rust
        uses: dtolnay/rust-toolchain@stable

      - name: cargo update
        # Remove first line that always just says "Updating crates.io index"
        run: CARGO_TERM_COLOR=never cargo update 2>&1 | sed '/crates.io index/d' | tee -a cargo_update.log

      - name: upload Cargo.lock artifact for use in PR
        uses: actions/upload-artifact@v4
        with:
          name: Cargo-lock
          path: Cargo.lock
          retention-days: 1

      - name: upload cargo-update log artifact for use in PR
        uses: actions/upload-artifact@v4
        with:
          name: cargo-updates
          path: cargo_update.log
          retention-days: 1

  pr-cargo:
    if: github.repository_owner == 'obi1kenobi'
    name: open or amend PR
    needs: update-cargo
    runs-on: ubuntu-latest
    env:
      BRANCH_NAME: cargo_update
    permissions:
      contents: write
      pull-requests: write
    steps:
      - name: checkout the source code
        uses: actions/checkout@v4
        with:
          persist-credentials: true

      - name: download Cargo.lock from update job
        uses: actions/download-artifact@v4
        with:
          name: Cargo-lock
      - name: download cargo-update log from update job
        uses: actions/download-artifact@v4
        with:
          name: cargo-updates

      - name: craft PR body and commit message
        run: |
          set -euo pipefail

          echo "${COMMIT_MESSAGE}" > commit.txt
          cat cargo_update.log >> commit.txt

          echo "${PR_MESSAGE}" > body.md
          echo '```txt' >> body.md
          cat cargo_update.log >> body.md
          echo '```' >> body.md

      - name: commit
        run: |
          set -euo pipefail

          git config user.name github-actions
          git config user.email github-actions@github.com
          git switch --force-create "$BRANCH_NAME"
          git add ./Cargo.lock
          DIFF="$(git diff --staged)"
          if [[ "$DIFF" == "" ]]; then
            echo >2 "Cargo.lock was not changed, bailing out and not making a PR"
            exit 1
          fi
          git commit --no-verify --file=commit.txt

      - name: push
        run: |
          set -euo pipefail
          git push --no-verify --force --set-upstream origin "$BRANCH_NAME"

      - name: edit existing open pull request
        id: edit
        # Don't fail job if we need to open new PR
        continue-on-error: true
        env:
          # We have to use a Personal Access Token (PAT) here.
          # PRs opened from a workflow using the standard `GITHUB_TOKEN` in GitHub Actions
          # do not automatically trigger more workflows:
          # https://docs.github.com/en/actions/security-guides/automatic-token-authentication#using-the-github_token-in-a-workflow
          GITHUB_TOKEN: ${{ secrets.DEPS_UPDATER_GITHUB_TOKEN }}
        run: |
          set -euo pipefail

          # Exit with error if PR is closed
          STATE="$(gh pr view "$BRANCH_NAME" --repo "$GITHUB_REPOSITORY" --json state --jq '.state')"
          if [[ "$STATE" != "OPEN" ]]; then
            exit 1
          fi

          gh pr edit "$BRANCH_NAME" --title "${PR_TITLE}" --body-file body.md --repo "$GITHUB_REPOSITORY"

      - name: open new pull request
        # Only run if there wasn't an existing PR
        if: steps.edit.outcome != 'success'
        env:
          # We have to use a Personal Access Token (PAT) here.
          # PRs opened from a workflow using the standard `GITHUB_TOKEN` in GitHub Actions
          # do not automatically trigger more workflows:
          # https://docs.github.com/en/actions/security-guides/automatic-token-authentication#using-the-github_token-in-a-workflow
          GITHUB_TOKEN: ${{ secrets.DEPS_UPDATER_GITHUB_TOKEN }}
        run: |
          set -euo pipefail
          gh pr create --title "${PR_TITLE}" --body-file body.md --repo "$GITHUB_REPOSITORY"

      - name: set PR to auto-merge
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: gh pr merge --squash --auto --delete-branch