X: Update publishGitHub script

publishGitHub.sh

@@ -1,9 +1,28 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+if [ "$#" -ne 1 ]; then
+    echo "Usage: $0 <github-snapshot-branch>" >&2
+    exit 1
+fi
+
+BRANCH="$1"
+
 SOURCE="$HOME/projects/com_r35157_nenjim-hubd-impl_ref"
 TARGET="$HOME/projects/com_r35157_nenjim-hubd-impl_ref_github_snapshot"
 
+cd "$TARGET"
+
+git fetch origin
+
+if git show-ref --verify --quiet "refs/heads/$BRANCH"; then
+    git switch "$BRANCH"
+elif git show-ref --verify --quiet "refs/remotes/origin/$BRANCH"; then
+    git switch --track "origin/$BRANCH"
+else
+    git switch --create "$BRANCH"
+fi
+
 rsync -a --delete \
   --exclude '.git' \
   --exclude 'conf/*.conf' \
@@ -11,13 +30,12 @@ rsync -a --delete \
   "$SOURCE/" \
   "$TARGET/"
 
-cd "$TARGET"
 git add -A
 
 if git diff --cached --quiet; then
-    echo "No snapshot changes to publish."
+    echo "No snapshot changes to publish on branch '$BRANCH'."
     exit 0
 fi
 
 git commit -m "Mirror snapshot"
-git push
+git push -u origin "$BRANCH"