fix: Harden base_ref checks in block-merge actions

workflow-templates/block-merge-eol.yml

@@ -27,13 +27,22 @@ jobs:
 
     steps:
       - name: Set server major version environment
-        run: |
-          # retrieve version number from branch reference
-          server_major=$(echo "${{ github.base_ref }}" | sed -En 's/stable//p')
-          echo "server_major=$server_major" >> $GITHUB_ENV
-          echo "current_month=$(date +%Y-%m)" >> $GITHUB_ENV
-
-      - name: Checking if ${{ env.server_major }} is EOL
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            const regex = /^stable(\d+)$/
+            const baseRef = context.payload.pull_request.base.ref
+            const match = baseRef.match(regex)
+            if (match) {
+              console.log('Setting server_major to ' + match[1]);
+              core.exportVariable('server_major', match[1]);
+              console.log('Setting current_month to ' + (new Date()).toISOString().substr(0, 7));
+              core.exportVariable('current_month', (new Date()).toISOString().substr(0, 7));
+            }
+
+      - name: Checking if server ${{ env.server_major }} is EOL
+        if: ${{ env.server_major != '' }}
         run: |
           curl -s https://raw.githubusercontent.com/nextcloud-releases/updater_server/production/config/major_versions.json \
             | jq '.["${{ env.server_major }}"]["eol"] // "9999-99" | . >= "${{ env.current_month }}"' \

workflow-templates/block-merge-freeze.yml

@@ -29,12 +29,29 @@ jobs:
 
     steps:
       - name: Register server reference to fallback to master branch
-        run: |
-          server_ref="$(if [ '${{ github.base_ref }}' = 'main' ]; then echo -n 'master'; else echo -n '${{ github.base_ref }}'; fi)"
-          echo "server_ref=$server_ref" >> $GITHUB_ENV
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            const baseRef = context.payload.pull_request.base.ref
+            if (baseRef === 'main' || baseRef === 'master') {
+              core.exportVariable('server_ref', 'master');
+              console.log('Setting server_ref to master');
+            } else {
+              const regex = /^stable(\d+)$/
+              const match = baseRef.match(regex)
+              if (match) {
+                core.exportVariable('server_ref', match[0]);
+                console.log('Setting server_ref to ' + match[0]);
+              } else {
+                console.log('Not based on master/main/stable*, so skipping freeze check');
+              }
+            }
 
       - name: Download version.php from ${{ env.server_ref }}
+        if: ${{ env.server_ref != '' }}
         run: curl 'https://raw.githubusercontent.com/nextcloud/server/${{ env.server_ref }}/version.php' --output version.php
 
       - name: Run check
+        if: ${{ env.server_ref != '' }}
         run: cat version.php | grep 'OC_VersionString' | grep -i -v 'RC'