Add macOS restore script

git-restore-zip-macos.sh

@@ -0,0 +1,32 @@
+# Restore a git mirror backup into a target repository.
+# Works on macOS.
+
+set -euo pipefail
+
+if [ $# -lt 2 ]; then
+  echo "Usage: $0 <backup.zip> <target-repo-url>"
+  exit 1
+fi
+
+ZIP="$1"
+TARGET="$2"
+WORK_DIR=".tmp_restore_mirror"
+
+if [ ! -f "$ZIP" ]; then
+  echo "Error: file not found: $ZIP"
+  exit 1
+fi
+
+cleanup() { rm -rf "$WORK_DIR"; }
+trap cleanup EXIT
+
+echo "[1/3] Extracting $ZIP ..."
+mkdir -p "$WORK_DIR"
+unzip -q "$ZIP" -d "$WORK_DIR"
+
+echo "[2/3] Pushing all refs to $TARGET ..."
+cd "$WORK_DIR"
+git remote set-url origin "$TARGET"
+git push --mirror
+
+echo "[3/3] Done. Repository restored at $TARGET"