Add GitHub Action to auto-switch default branch on new tags #1
Workflow file for this run
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| name: Auto-switch default branch on new tag | |
| on: | |
| push: | |
| tags: | |
| - '*.*.*' # tags du type a.b.c (1.2.3, 2.0.0, etc.) | |
| jobs: | |
| update-default-branch: | |
| runs-on: ubuntu-latest | |
| permissions: | |
| contents: write # nécessaire pour modifier le repo via l'API | |
| steps: | |
| - name: Parse tag and compute target branch | |
| id: vars | |
| run: | | |
| ref="${GITHUB_REF#refs/tags/}" # ex: 1.2.3 ou 1.2.3. | |
| # On enlève un éventuel '.' final (au cas où : 1.2.3. -> 1.2.3) | |
| version="${ref%.}" | |
| echo "Tag ref: $ref" | |
| echo "Version: $version" | |
| IFS='.' read -r major minor patch <<< "$version" | |
| echo "Major: $major" | |
| echo "Minor: $minor" | |
| echo "Patch: $patch" | |
| target_branch="${major}.${minor}.x" | |
| echo "Target branch: $target_branch" | |
| echo "major=$major" >> "$GITHUB_OUTPUT" | |
| echo "minor=$minor" >> "$GITHUB_OUTPUT" | |
| echo "target_branch=$target_branch" >> "$GITHUB_OUTPUT" | |
| - name: Get current default branch | |
| id: repo | |
| env: | |
| GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} | |
| run: | | |
| default_branch=$(gh repo view "${GITHUB_REPOSITORY}" --json defaultBranchRef --jq .defaultBranchRef.name) | |
| echo "Current default branch: $default_branch" | |
| echo "default_branch=$default_branch" >> "$GITHUB_OUTPUT" | |
| - name: Check target branch exists | |
| id: exists | |
| env: | |
| GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} | |
| run: | | |
| target="${{ steps.vars.outputs.target_branch }}" | |
| echo "Checking if branch $target exists..." | |
| if gh api "repos/${GITHUB_REPOSITORY}/branches/$target" >/dev/null 2>&1; then | |
| echo "Branch $target exists." | |
| echo "exists=true" >> "$GITHUB_OUTPUT" | |
| else | |
| echo "Branch $target does not exist, skipping." | |
| echo "exists=false" >> "$GITHUB_OUTPUT" | |
| fi | |
| - name: Decide whether to switch | |
| id: decide | |
| run: | | |
| target="${{ steps.vars.outputs.target_branch }}" | |
| current="${{ steps.repo.outputs.default_branch }}" | |
| major="${{ steps.vars.outputs.major }}" | |
| minor="${{ steps.vars.outputs.minor }}" | |
| echo "Current default: $current" | |
| echo "Target branch: $target" | |
| echo "Tag version: $major.$minor" | |
| # Si le target branch n'existe pas -> on ne fait rien | |
| if [ "${{ steps.exists.outputs.exists }}" != "true" ]; then | |
| echo "switch_needed=false" >> "$GITHUB_OUTPUT" | |
| exit 0 | |
| fi | |
| # On ne s'intéresse qu'aux default branches de type a.b.x | |
| if [[ "$current" =~ ^([0-9]+)\.([0-9]+)\.x$ ]]; then | |
| current_major="${BASH_REMATCH[1]}" | |
| current_minor="${BASH_REMATCH[2]}" | |
| echo "Current parsed version: $current_major.$current_minor" | |
| else | |
| echo "Current default branch is not of the form a.b.x, skipping." | |
| echo "switch_needed=false" >> "$GITHUB_OUTPUT" | |
| exit 0 | |
| fi | |
| # Comparaison (major, minor) | |
| if [ "$major" -gt "$current_major" ] || { [ "$major" -eq "$current_major" ] && [ "$minor" -gt "$current_minor" ]; }; then | |
| echo "New version $major.$minor is higher than $current_major.$current_minor → will switch." | |
| echo "switch_needed=true" >> "$GITHUB_OUTPUT" | |
| else | |
| echo "New version $major.$minor is not higher than $current_major.$current_minor → no switch." | |
| echo "switch_needed=false" >> "$GITHUB_OUTPUT" | |
| fi | |
| - name: Update default branch | |
| if: steps.decide.outputs.switch_needed == 'true' | |
| env: | |
| GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} | |
| run: | | |
| target="${{ steps.vars.outputs.target_branch }}" | |
| echo "Switching default branch to: $target" | |
| gh api -X PATCH "repos/${GITHUB_REPOSITORY}" \ | |
| -f default_branch="$target" |