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package ref
import (
"context"
"strings"
"gitlab.com/gitlab-org/gitaly/v15/internal/command"
"gitlab.com/gitlab-org/gitaly/v15/internal/git"
"gitlab.com/gitlab-org/gitaly/v15/internal/gitaly/service"
"gitlab.com/gitlab-org/gitaly/v15/internal/structerr"
"gitlab.com/gitlab-org/gitaly/v15/proto/go/gitalypb"
)
// RefExists returns true if the given reference exists. The ref must start with the string `ref/`
func (s *server) RefExists(ctx context.Context, in *gitalypb.RefExistsRequest) (*gitalypb.RefExistsResponse, error) {
if err := service.ValidateRepository(in.GetRepository()); err != nil {
return nil, structerr.NewInvalidArgument("%w", err)
}
ref := string(in.Ref)
if !isValidRefName(ref) {
return nil, structerr.NewInvalidArgument("invalid refname")
}
exists, err := s.refExists(ctx, in.Repository, ref)
if err != nil {
return nil, structerr.NewInternal("%w", err)
}
return &gitalypb.RefExistsResponse{Value: exists}, nil
}
func (s *server) refExists(ctx context.Context, repo *gitalypb.Repository, ref string) (bool, error) {
cmd, err := s.gitCmdFactory.New(ctx, repo, git.Command{
Name: "show-ref",
Flags: []git.Option{git.Flag{Name: "--verify"}, git.Flag{Name: "--quiet"}},
Args: []string{ref},
})
if err != nil {
return false, err
}
err = cmd.Wait()
if err == nil {
// Exit code 0: the ref exists
return true, nil
}
if code, ok := command.ExitStatus(err); ok && code == 1 {
// Exit code 1: the ref does not exist
return false, nil
}
// This will normally occur when exit code > 1
return false, err
}
func isValidRefName(refName string) bool {
return strings.HasPrefix(refName, "refs/")
}
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