move tag check earlier

Author: rickeylev

.github/workflows/create_archive_and_notes.sh

@@ -19,6 +19,11 @@ set -o errexit
 
 set -x
 
+TAG=$1
+if [ -z "$TAG" ]; then
+  echo "ERROR: TAG env var must be set"
+  exit 1
+fi
 # Exclude dot directories, specifically, this file so that we don't
 # find the substring we're looking for in our own file.
 # Exclude CONTRIBUTING.md, RELEASING.md because they document how to use these strings.
@@ -35,14 +40,10 @@ if [[ $grep_exit_code -eq 0 ]]; then
   exit 1
 fi
 
-TAG=$1
-if [ -z "$TAG" ]; then
-  echo "ERROR: TAG env var must be set"
-  exit 1
-fi
 # A prefix is added to better match the GitHub generated archives.
 PREFIX="rules_python-${TAG}"
 ARCHIVE="rules_python-$TAG.tar.gz"
+# If the workflow checks out one commit, but is releasing another
 git fetch origin tag "$TAG"
 git archive --format=tar "--prefix=${PREFIX}/" "$TAG" | gzip > "$ARCHIVE"
 SHA=$(shasum -a 256 "$ARCHIVE" | awk '{print $1}')