Add support for checking out non-existent branches in JUnit reports workflow

Author: Donnerbart

.github/workflows/integration-test.yml

@@ -71,6 +71,37 @@ jobs:
           path: junit-reports-first-index-4
           upload-artifact: false
 
+      - name: Checkout JUnit reports (non-existent branch)
+        uses: ./checkout-junit-reports
+        with:
+          split-index: 0
+          git-branch: junit-reports-it-${{ github.sha }}-nonexistent
+          path: junit-reports-nonexistent-branch
+          upload-artifact: false
+
+      - name: Assert non-existent branch checkout
+        run: |
+          echo "Verifying that checkout with non-existent branch succeeded"
+          if [ ! -d "junit-reports-nonexistent-branch" ]; then
+            echo "Error: Directory junit-reports-nonexistent-branch was not created!"
+            exit 1
+          fi
+          cd junit-reports-nonexistent-branch
+          # Should be on the default branch, verify we have the action files
+          if [ ! -f "action.yml" ]; then
+            echo "Error: action.yml not found - checkout didn't work properly!"
+            ls -la
+            exit 1
+          fi
+          # Verify we're not on the non-existent branch
+          CURRENT_BRANCH=$(git branch --show-current)
+          if [ "$CURRENT_BRANCH" == "junit-reports-it-${{ github.sha }}-nonexistent" ]; then
+            echo "Error: Should not be on the non-existent branch!"
+            exit 1
+          fi
+          echo "Successfully verified checkout with non-existent branch stays on default branch"
+          cd ..
+
       - name: Assert JUnit reports
         run: |
           for SPLIT_INDEX in {0..3}; do

checkout-junit-reports/action.yml

@@ -49,6 +49,11 @@ runs:
         name: ${{ inputs.artifact-name }}
         path: ${{ inputs.artifact-path }}
 
+    - name: Checkout repository
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      with:
+        path: ${{ inputs.path }}
+
     - name: Check JUnit reports SHA
       id: junit-reports-sha
       shell: bash
@@ -57,32 +62,47 @@ runs:
         UPLOAD_SHA_ARTIFACT=${{ inputs.upload-artifact }}
         CHECKOUT_REF=${{ inputs.git-branch }}
         if [ -d ${{ inputs.artifact-path }} ]; then
-          cd ${{ inputs.artifact-path }}
-          if [ -f junit-reports-sha.txt ]; then
+          if [ -f ${{ inputs.artifact-path }}/junit-reports-sha.txt ]; then
             UPLOAD_SHA_ARTIFACT=false
-            CHECKOUT_REF=$(cat junit-reports-sha.txt)
+            CHECKOUT_REF=$(cat ${{ inputs.artifact-path }}/junit-reports-sha.txt)
+            cd ${{ inputs.path }}
+            echo "Checking out specific SHA: $CHECKOUT_REF"
+            git fetch --quiet
+            git checkout $CHECKOUT_REF
+          else
+            cd ${{ inputs.path }}
+            if git ls-remote --exit-code --heads origin $CHECKOUT_REF; then
+              echo "Switching to existing branch: $CHECKOUT_REF"
+              git fetch --quiet
+              git switch $CHECKOUT_REF
+            else
+              echo "Branch $CHECKOUT_REF does not exist, staying on default branch"
+              UPLOAD_SHA_ARTIFACT=false
+            fi
           fi
         else
           mkdir ${{ inputs.artifact-path }} || true
+          cd ${{ inputs.path }}
+          if git ls-remote --exit-code --heads origin $CHECKOUT_REF; then
+            echo "Switching to existing branch: $CHECKOUT_REF"
+            git fetch --quiet
+            git switch $CHECKOUT_REF
+          else
+            echo "Branch $CHECKOUT_REF does not exist, staying on default branch"
+            UPLOAD_SHA_ARTIFACT=false
+          fi
         fi
         if [ "$UPLOAD_SHA_ARTIFACT" == "true" ]; then
-          echo "Checking out JUnit reports from branch $CHECKOUT_REF"
+          echo "Will upload JUnit reports SHA for branch $CHECKOUT_REF"
         else
-          echo "Checking out JUnit reports from previously used SHA $CHECKOUT_REF"
+          echo "Will not upload JUnit reports SHA"
         fi
         # we can only upload the artifact once, so only do this on the first split
         if [ "${{ inputs.split-index }}" != "0" ]; then
           echo "Skipping upload of JUnit reports SHA on this index"
           UPLOAD_SHA_ARTIFACT=false
         fi
         echo "upload-artifact=${UPLOAD_SHA_ARTIFACT}" >> "$GITHUB_OUTPUT"
-        echo "ref=${CHECKOUT_REF}" >> "$GITHUB_OUTPUT"
-
-    - name: Checkout repository
-      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
-      with:
-        path: ${{ inputs.path }}
-        ref: ${{ steps.junit-reports-sha.outputs.ref }}
 
     - name: Save JUnit reports SHA
       if: ${{ steps.junit-reports-sha.outputs.upload-artifact == 'true' }}