From 240ab20f8e64249b6af2e55b555edcb89eda3c09 Mon Sep 17 00:00:00 2001
From: bullet-ant <aman.kr.2129@gmail.com>
Date: Sun, 15 Sep 2024 14:51:58 +0530
Subject: [PATCH] refactor workflow to compare versions between 'app' and
 'main' before creating PR

---
 .github/workflows/docker.yaml | 74 ++++++++++++++++++++++-------------
 1 file changed, 46 insertions(+), 28 deletions(-)

diff --git a/.github/workflows/docker.yaml b/.github/workflows/docker.yaml
index c53fe67..4cb093b 100644
--- a/.github/workflows/docker.yaml
+++ b/.github/workflows/docker.yaml
@@ -14,58 +14,76 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      # Step 1: Checkout the latest code from the repo
-      - name: Checkout code
+      # Step 1: Checkout the 'app' branch code
+      - name: Checkout app branch code
         uses: actions/checkout@v4
+        with:
+          ref: app
 
       # Step 2: Install jq to parse package.json
       - name: Install jq
         run: sudo apt-get install -y jq
 
-      # Step 3: Set up Docker in the workflow
+      # Step 3: Get version from 'app' branch
+      - name: Get version from app branch
+        id: app_version
+        run: |
+          APP_VERSION=$(cat app/package.json | jq -r .version)
+          echo "APP_VERSION=$APP_VERSION" >> $GITHUB_ENV
+          echo "Version on 'app' branch: $APP_VERSION"
+
+      # Step 4: Checkout the 'main' branch code
+      - name: Checkout main branch code
+        uses: actions/checkout@v4
+        with:
+          ref: main
+
+      # Step 5: Get version from 'main' branch
+      - name: Get version from main branch
+        id: main_version
+        run: |
+          MAIN_VERSION=$(cat app/package.json | jq -r .version)
+          echo "MAIN_VERSION=$MAIN_VERSION" >> $GITHUB_ENV
+          echo "Version on 'main' branch: $MAIN_VERSION"
+
+      # Step 6: Set up Docker in the workflow
       - name: Set up Docker
         uses: docker/setup-buildx-action@v3
 
-      # Step 4: Log in to Docker Hub using secrets
+      # Step 7: Log in to Docker Hub using secrets (Optional)
       - name: Log in to Docker Hub
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USER }}
           password: ${{ secrets.DOCKER_PASS }}
 
-      # Step 5: Extract version from package.json
-      - name: Extract version from package.json
-        id: get_version
-        run: |
-          VERSION=$(cat app/package.json | jq -r .version)
-          echo "VERSION=$VERSION"
-          echo "::set-output name=version::$VERSION"
-
-      # Step 6: Build Docker image with version tag
+      # Step 8: Build Docker image with version tag (Optional)
       - name: Build Docker image
         run: |
-          docker build -t ${{ secrets.DOCKER_USER }}/gitops-app:${{ steps.get_version.outputs.version }} app/.
+          docker build -t ${{ secrets.DOCKER_USER }}/gitops-app:${{ env.APP_VERSION }} app/.
 
-      # Step 7: Push Docker image to Docker Hub
+      # Step 9: Push Docker image to Docker Hub (Optional)
       - name: Push Docker image
         run: |
-          docker push ${{ secrets.DOCKER_USER }}/gitops-app:${{ steps.get_version.outputs.version }}
-
-      - name: Checkout main
-        uses: actions/checkout@v4
-        with:
-          ref: main
+          docker push ${{ secrets.DOCKER_USER }}/gitops-app:${{ env.APP_VERSION }}
 
-      - name: Reset app branch
+      # Step 10: Compare versions between 'app' and 'main' branches
+      - name: Compare versions
+        id: version_check
         run: |
-          git fetch origin app
-          git reset --hard origin/app
+          if [ "$APP_VERSION" != "$MAIN_VERSION" ]; then
+            echo "Version changed: Creating PR."
+            echo "VERSION_CHANGED=true" >> $GITHUB_ENV
+          else
+            echo "No version change: Skipping PR."
+            echo "VERSION_CHANGED=false" >> $GITHUB_ENV
+          fi
 
+      # Step 11: Create a Pull Request only if the version changed and Docker image was built successfully
       - name: Create Pull Request
-        if: success()
+        if: success() && env.VERSION_CHANGED == 'true'
         uses: peter-evans/create-pull-request@v7
         with:
-          branch: merge-app
-          delete-branch: true
-          title: "Automated PR: Merge 'app' into 'main'"
+          branch: merge-app-${{ env.APP_VERSION }}
+          title: "Automated PR: Merge 'app' into 'main' (Version ${{ env.APP_VERSION }})"
           labels: image-built