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Merge pull request microsoft#228 from microsoft/PSL-DependabotAutoMergeWorkflow
chore: Updated Dependabot config to group PRs and added workflow for scheduled auto-merge
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‎.github/dependabot.yml‎

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version: 2
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updates:
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# GitHub Actions dependencies
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# GitHub Actions dependencies (grouped)
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- package-ecosystem: "github-actions"
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directory: "/"
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schedule:
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prefix: "build"
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target-branch: "dependabotchanges"
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open-pull-requests-limit: 10
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groups:
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all-actions:
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patterns:
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- "*"
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# Python pip dependencies (grouped)
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- package-ecosystem: "pip"
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directory: "/src/backend"
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schedule:
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prefix: "build"
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target-branch: "dependabotchanges"
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open-pull-requests-limit: 10
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groups:
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python-deps:
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patterns:
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- "*"
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- package-ecosystem: "pip"
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directory: "/src/frontend"
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commit-message:
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prefix: "build"
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target-branch: "dependabotchanges"
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open-pull-requests-limit: 10
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open-pull-requests-limit: 10
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groups:
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python-deps:
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patterns:
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- "*"

‎.github/workflows/scheduled-Dependabot-PRs-Auto-Merge.yml‎

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# ------------------------------------------------------------------------------
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# Scheduled Dependabot PRs Auto-Merge Workflow
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#
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# Purpose:
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# - Automatically detect, rebase (if needed), and merge Dependabot PRs targeting
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# the `dependabotchanges` branch, supporting different merge strategies.
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#
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# Features:
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# ✅ Filters PRs authored by Dependabot and targets the specific base branch
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# ✅ Rebases PRs with conflicts and auto-resolves using "prefer-theirs" strategy
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# ✅ Attempts all three merge strategies: merge, squash, rebase (first success wins)
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# ✅ Handles errors gracefully, logs clearly
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#
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# Triggers:
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# - Scheduled daily run (midnight UTC)
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# - Manual trigger (via GitHub UI)
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#
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# Required Permissions:
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# - contents: write
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# - pull-requests: write
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# ------------------------------------------------------------------------------
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name: Scheduled Dependabot PRs Auto-Merge
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on:
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schedule:
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- cron: '0 0 * * *' # Runs once a day at midnight UTC
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workflow_dispatch:
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permissions:
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contents: write
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pull-requests: write
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jobs:
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merge-dependabot:
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runs-on: ubuntu-latest
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steps:
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- name: Checkout repository
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uses: actions/checkout@v4
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- name: Install GitHub CLI
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run: |
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sudo apt update
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sudo apt install -y gh
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- name: Fetch & Filter Dependabot PRs
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env:
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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run: |
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echo "🔍 Fetching all Dependabot PRs targeting 'dependabotchanges'..."
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> matched_prs.txt
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pr_batch=$(gh pr list --state open --json number,title,author,baseRefName,url \
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--jq '.[] | "\(.number)|\(.title)|\(.author.login)|\(.baseRefName)|\(.url)"')
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while IFS='|' read -r number title author base url; do
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author=$(echo "$author" | xargs)
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base=$(echo "$base" | xargs)
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if [[ "$author" == "app/dependabot" && "$base" == "dependabotchanges" ]]; then
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echo "$url" >> matched_prs.txt
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echo "✅ Matched PR #$number - $title"
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else
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echo "❌ Skipped PR #$number - $title (Author: $author, Base: $base)"
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fi
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done <<< "$pr_batch"
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echo "👉 Matched PRs:"
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cat matched_prs.txt || echo "None"
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- name: Rebase PR if Conflicts Exist
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if: success()
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env:
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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run: |
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if [[ ! -s matched_prs.txt ]]; then
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echo "⚠️ No matching PRs to process."
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exit 0
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fi
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while IFS= read -r pr_url; do
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pr_number=$(basename "$pr_url")
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echo "🔁 Checking PR #$pr_number for conflicts..."
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mergeable=$(gh pr view "$pr_number" --json mergeable --jq '.mergeable')
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if [[ "$mergeable" == "CONFLICTING" ]]; then
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echo "⚠️ Merge conflicts detected. Performing manual rebase for PR #$pr_number..."
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head_branch=$(gh pr view "$pr_number" --json headRefName --jq '.headRefName')
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base_branch=$(gh pr view "$pr_number" --json baseRefName --jq '.baseRefName')
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git fetch origin "$base_branch":"$base_branch"
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git fetch origin "$head_branch":"$head_branch"
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git checkout "$head_branch"
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git config user.name "github-actions"
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git config user.email "action@github.com"
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# Attempt rebase with 'theirs' strategy
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if git rebase --strategy=recursive -X theirs "$base_branch"; then
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echo "✅ Rebase successful. Pushing..."
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git push origin "$head_branch" --force
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else
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echo "❌ Rebase failed. Aborting..."
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git rebase --abort || true
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fi
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else
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echo "✅ PR #$pr_number is mergeable. Skipping rebase."
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fi
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done < matched_prs.txt
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- name: Auto-Merge PRs using available strategy
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if: success()
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env:
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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run: |
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if [[ ! -s matched_prs.txt ]]; then
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echo "⚠️ No matching PRs to process."
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exit 0
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fi
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while IFS= read -r pr_url; do
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pr_number=$(basename "$pr_url")
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echo "🔍 Checking mergeability for PR #$pr_number"
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attempt=0
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max_attempts=8
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mergeable=""
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sleep 5 # Let GitHub calculate mergeable status
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while [[ $attempt -lt $max_attempts ]]; do
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mergeable=$(gh pr view "$pr_number" --json mergeable --jq '.mergeable' 2>/dev/null || echo "UNKNOWN")
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echo "🔁 Attempt $((attempt+1))/$max_attempts: mergeable=$mergeable"
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if [[ "$mergeable" == "MERGEABLE" ]]; then
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success=0
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for strategy in rebase squash merge; do
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echo "🚀 Trying to auto-merge PR #$pr_number using '$strategy' strategy..."
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set -x
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merge_output=$(gh pr merge --auto --"$strategy" "$pr_url" 2>&1)
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merge_status=$?
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set +x
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echo "$merge_output"
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if [[ $merge_status -eq 0 ]]; then
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echo "✅ Auto-merge succeeded using '$strategy'."
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success=1
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break
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else
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echo "❌ Auto-merge failed using '$strategy'. Trying next strategy..."
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fi
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done
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if [[ $success -eq 0 ]]; then
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echo "❌ All merge strategies failed for PR #$pr_number"
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fi
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break
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elif [[ "$mergeable" == "CONFLICTING" ]]; then
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echo "❌ Cannot merge due to conflicts. Skipping PR #$pr_number"
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break
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else
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echo "🕒 Waiting for GitHub to determine mergeable status..."
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sleep 15
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fi
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((attempt++))
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done
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if [[ "$mergeable" != "MERGEABLE" && "$mergeable" != "CONFLICTING" ]]; then
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echo "❌ Mergeability undetermined after $max_attempts attempts. Skipping PR #$pr_number"
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fi
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done < matched_prs.txt || echo "⚠️ Completed loop with some errors, but continuing gracefully."

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