#!/usr/bin/env bash
# Checkout this repo without downloading actions/checkout from GitHub.
# act_runner may already have placed sources in the workspace; otherwise
# clone from the same Gitea that started the job.
set -euo pipefail

SERVER="${GITHUB_SERVER_URL:-${GITEA_SERVER_URL:-}}"
REPO="${GITHUB_REPOSITORY:-${GITEA_REPOSITORY:-}}"
SHA="${GITHUB_SHA:-${GITEA_SHA:-}}"

if [[ -f CMakeLists.txt && -d src ]]; then
  echo "==> workspace already has sources"
  git rev-parse --short HEAD 2>/dev/null || true
  exit 0
fi

if [[ -z "$SERVER" || -z "$REPO" ]]; then
  echo "missing GITHUB_SERVER_URL / GITHUB_REPOSITORY" >&2
  exit 1
fi

echo "==> git clone $SERVER/$REPO"
git clone --filter=blob:none "$SERVER/$REPO.git" _ci_src
if [[ -n "$SHA" ]]; then
  git -C _ci_src fetch --depth 1 origin "$SHA" || git -C _ci_src fetch origin "$SHA"
  git -C _ci_src checkout --force "$SHA"
fi
# Move into the workspace root (may already contain act_runner metadata).
shopt -s dotglob nullglob
mv _ci_src/* .
rmdir _ci_src 2>/dev/null || rm -rf _ci_src
test -f CMakeLists.txt
git rev-parse --short HEAD