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package repoutil
import (
"context"
"os"
"path/filepath"
"github.com/grpc-ecosystem/go-grpc-middleware/logging/logrus/ctxlogrus"
"gitlab.com/gitlab-org/gitaly/v16/internal/gitaly/storage"
"gitlab.com/gitlab-org/gitaly/v16/internal/helper/perm"
"gitlab.com/gitlab-org/gitaly/v16/internal/safe"
"gitlab.com/gitlab-org/gitaly/v16/internal/structerr"
"gitlab.com/gitlab-org/gitaly/v16/proto/go/gitalypb"
)
// Lock attempts to lock the entire repository directory such that only one
// process can obtain the lock at a time.
//
// The repositories parent directory will be created if it does not exist.
//
// Returns the error safe.ErrFileAlreadyLocked if the repository is already
// locked.
func Lock(ctx context.Context, locator storage.Locator, repository *gitalypb.Repository) (func(), error) {
path, err := locator.GetPath(repository)
if err != nil {
return nil, err
}
// Create the parent directory in case it doesn't exist yet.
if err := os.MkdirAll(filepath.Dir(path), perm.GroupPrivateDir); err != nil {
return nil, structerr.NewInternal("create directories: %w", err)
}
// We're somewhat abusing this file writer given that we simply want to assert that
// the target directory doesn't exist and isn't created while we want to move the
// new repository into place. We thus only use the locking semantics of the writer,
// but will never commit it.
locker, err := safe.NewLockingFileWriter(path)
if err != nil {
return nil, err
}
unlock := func() {
if err := locker.Close(); err != nil {
ctxlogrus.Extract(ctx).Error("closing repository locker: %w", err)
}
}
if err := locker.Lock(); err != nil {
unlock()
return nil, err
}
return unlock, nil
}
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