100 lines
2.6 KiB
Bash
100 lines
2.6 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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PRIMARY_REMOTE="${PRIMARY_REMOTE:-origin}"
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MIRROR_REMOTE="${MIRROR_REMOTE:-gitlab}"
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SYNC_BRANCHES="${SYNC_BRANCHES:-}"
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SYNC_TAGS="${SYNC_TAGS:-true}"
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FORCE="${FORCE:-false}"
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PRUNE="${PRUNE:-false}"
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DRY_RUN="${DRY_RUN:-false}"
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usage() {
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cat <<'EOF'
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Usage: scripts/sync-gitlab-mirror.sh [--force] [--prune] [--no-tags] [--dry-run]
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Mirrors branches and tags from the primary GitHub remote to the GitLab backup remote.
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Environment:
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PRIMARY_REMOTE Primary remote name. Default: origin
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MIRROR_REMOTE Mirror remote name. Default: gitlab
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SYNC_BRANCHES Space/comma separated branch list. Default: all PRIMARY_REMOTE branches
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SYNC_TAGS Push tags too. Default: true
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FORCE Use --force-with-lease for branches. Default: false
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PRUNE Delete GitLab branches missing on GitHub. Default: false
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DRY_RUN Print git commands without running them. Default: false
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EOF
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}
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--force) FORCE="true" ;;
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--prune) PRUNE="true" ;;
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--no-tags) SYNC_TAGS="false" ;;
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--dry-run) DRY_RUN="true" ;;
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-h|--help) usage; exit 0 ;;
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*) echo "Unknown argument: $1" >&2; usage; exit 2 ;;
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esac
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shift
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done
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run_git() {
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if [[ "$DRY_RUN" == "true" ]]; then
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printf 'git'
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printf ' %q' "$@"
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printf '\n'
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return
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fi
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git "$@"
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}
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normalize_list() {
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local value="$1"
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value="${value//,/ }"
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value="${value//;/ }"
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echo "$value"
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}
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run_git fetch "$PRIMARY_REMOTE" --prune --tags
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if [[ "$FORCE" == "true" ]]; then
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run_git fetch "$MIRROR_REMOTE" --prune
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fi
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if [[ -n "$SYNC_BRANCHES" ]]; then
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read -r -a branches <<< "$(normalize_list "$SYNC_BRANCHES")"
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else
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branches=()
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while IFS= read -r branch; do
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[[ "$branch" != "HEAD" ]] || continue
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branches+=("$branch")
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done < <(git for-each-ref --format='%(refname:strip=3)' "refs/remotes/$PRIMARY_REMOTE")
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fi
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for branch in "${branches[@]}"; do
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[[ -n "$branch" ]] || continue
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src="refs/remotes/$PRIMARY_REMOTE/$branch"
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dst="refs/heads/$branch"
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args=("push" "$MIRROR_REMOTE")
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if [[ "$FORCE" == "true" ]]; then
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args+=("--force-with-lease=$dst")
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fi
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args+=("$src:$dst")
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run_git "${args[@]}"
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done
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if [[ "$SYNC_TAGS" == "true" ]]; then
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run_git push "$MIRROR_REMOTE" --tags
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fi
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if [[ "$PRUNE" == "true" ]]; then
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primary_branches="$(printf '%s\n' "${branches[@]}")"
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while read -r mirror_branch; do
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[[ -n "$mirror_branch" ]] || continue
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if ! grep -Fxq "$mirror_branch" <<< "$primary_branches"; then
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run_git push "$MIRROR_REMOTE" ":refs/heads/$mirror_branch"
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fi
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done < <(git ls-remote --heads "$MIRROR_REMOTE" | sed 's#.*refs/heads/##')
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fi
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