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package ref
import (
"bufio"
"log"
"strings"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"golang.org/x/net/context"
pb "gitlab.com/gitlab-org/gitaly-proto/go"
"gitlab.com/gitlab-org/gitaly/internal/helper"
)
// FindRefName returns a ref that starts with the given prefix, if one exists.
// If there is more than one such ref there is no guarantee which one is
// returned or that the same one is returned on each call.
func (s *server) FindRefName(ctx context.Context, in *pb.FindRefNameRequest) (*pb.FindRefNameResponse, error) {
repoPath, err := helper.GetRepoPath(in.Repository)
if err != nil {
return nil, err
}
if in.CommitId == "" {
message := "Bad Request (empty commit sha)"
log.Printf("FindRefName: %q", message)
return nil, grpc.Errorf(codes.InvalidArgument, message)
}
ref, err := findRefName(repoPath, in.CommitId, string(in.Prefix))
if err != nil {
return nil, grpc.Errorf(codes.Internal, err.Error())
}
return &pb.FindRefNameResponse{Name: []byte(ref)}, nil
}
// We assume `path` and `commitID` and `prefix` are non-empty
func findRefName(path, commitID, prefix string) (string, error) {
cmd, err := helper.GitCommandReader("--git-dir", path, "for-each-ref", "--format=%(refname)", "--count=1", prefix, "--contains", commitID)
if err != nil {
return "", err
}
defer cmd.Kill()
log.Printf("findRefName: RepoPath=%q commitSha=%s prefix=%s", path, commitID, prefix)
scanner := bufio.NewScanner(cmd)
scanner.Scan()
if err := scanner.Err(); err != nil {
return "", err
}
refName := scanner.Text()
if err := cmd.Wait(); err != nil {
// We're suppressing the error since invalid commits isn't an error
// according to Rails
return "", nil
}
// Trailing spaces are not allowed per the documentation
// https://www.kernel.org/pub/software/scm/git/docs/git-check-ref-format.html
return strings.TrimSpace(refName), nil
}
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