#!/bin/bash
# Restore a git mirror backup into a target repository.
# Works on Linux and 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 on exit
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"