fix(#476): 🐛 output variable edge cases (#479)

* fix(#476): 🐛 issue with empty output variable

* fix: 🐛

README.md

@@ -262,6 +262,13 @@ jobs:
 | ------ | ----------- |
 | pr_branch | The name of the branch used for the pull request |
 
+**Remarks** Please consider following edge cases
+
+* **pr_branch**
+ * If PR branch already exists (e.g. after a 2nd run) the action won't update the branch but will still output the branch name
+ * If the remote repository already contains the source repository changes the action will exit and the output variable will be undefined
+ * If there are no changes the action will exit and the output variable will be undefined
+
 ### Docker
 
 There are docker images available. Please checkout [How to use docker](docs/DOCKER.md) for details.

src/sync_template.sh

@@ -48,11 +48,24 @@ debug "new Git HASH ${NEW_TEMPLATE_GIT_HASH}"
 
 echo "::group::Check new changes"
 
+function set_github_action_outputs() {
+ echo "::group::set gh action outputs"
+ if [[ -z "${GITHUB_RUN_ID}" ]]; then
+ info "env var 'GITHUB_RUN_ID' is empty -> no github action workflow"
+ else
+ # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter
+ echo "pr_branch=${NEW_BRANCH}" >> "$GITHUB_OUTPUT"
+ fi
+ echo "::endgroup::"
+}
+
+
 function check_branch_remote_existing() {
  git ls-remote --exit-code --heads origin "${NEW_BRANCH}" || BRANCH_DOES_NOT_EXIST=true
 
  if [[ "${BRANCH_DOES_NOT_EXIST}" != true ]]; then
  warn "Git branch '${NEW_BRANCH}' exists in the remote repository"
+ set_github_action_outputs
  exit 0
  fi
 }
@@ -240,15 +253,4 @@ fi
 
 echo "::endgroup::"
 
-function set_github_action_outputs() {
- echo "::group::set gh action outputs"
- if [[ -z "${GITHUB_RUN_ID}" ]]; then
- info "env var 'GITHUB_RUN_ID' is empty -> no github action workflow"
- else
- # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter
- echo "pr_branch=${NEW_BRANCH}" >> "$GITHUB_OUTPUT"
- fi
- echo "::endgroup::"
-}
-
 set_github_action_outputs