fix: api pull_request build failed due to head/head/ duplication

src/commands/checkout_advanced.yml

@@ -99,12 +99,18 @@ steps:
         if [ -n "$CIRCLE_TAG" ]; then
           # tag
           git fetch << parameters.tag_fetch_options >> << parameters.fetch_options >> --force origin "+refs/tags/${CIRCLE_TAG}:refs/tags/${CIRCLE_TAG}"
-        elif [[ $(echo $CIRCLE_BRANCH | grep -e ^pull\/*) ]]; then
+        elif [ $(echo $CIRCLE_BRANCH | grep -e ^pull\/*) ]; then
           # pull request
-          git fetch << parameters.fetch_options >> --force origin "${CIRCLE_BRANCH}/head:remotes/origin/${CIRCLE_BRANCH}"
+          if [ $(echo $CIRCLE_BRANCH | grep -e .*\/head$) ]; then
+            # remove /head from CIRCLE_BRANCH
+            headless_CIRCLE_BRANCH=$(echo $CIRCLE_BRANCH | rev | cut -c6- | rev)
+            git fetch << parameters.fetch_options >> --force origin "${headless_CIRCLE_BRANCH}/head:remotes/origin/${CIRCLE_BRANCH}"
+          else
+            git fetch << parameters.fetch_options >> --force origin "${CIRCLE_BRANCH}/head:remotes/origin/${CIRCLE_BRANCH}"
+          fi
         else
           # others
-          git fetch << parameters.fetch_options >> --force origin "$CIRCLE_BRANCH:remotes/origin/$CIRCLE_BRANCH"
+          git fetch << parameters.fetch_options >> --force origin "${CIRCLE_BRANCH}:remotes/origin/${CIRCLE_BRANCH}"
         fi
 
         # Check the commit ID of the checked out code