Merge pull request #3131 from github/henrymercer/required-checks-safety

CI: Improve safety of update required checks script

Author: henrymercer

.github/workflows/script/update-required-checks.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 # Update the required checks based on the current branch.
 
+set -euo pipefail
+
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 REPO_DIR="$(dirname "$SCRIPT_DIR")"
 GRANDPARENT_DIR="$(dirname "$REPO_DIR")"
@@ -31,6 +33,12 @@ CHECKS="$(gh api repos/github/codeql-action/commits/"${GITHUB_SHA}"/check-runs -
 
 echo "$CHECKS" | jq
 
+# Fail if there are no checks
+if [ -z "$CHECKS" ] || [ "$(echo "$CHECKS" | jq '. | length')" -eq 0 ]; then
+  echo "No checks found for $GITHUB_SHA"
+  exit 1
+fi
+
 echo "{\"contexts\": ${CHECKS}}" > checks.json
 
 echo "Updating main"