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package remote
import (
"bytes"
"context"
"io"
"gitlab.com/gitlab-org/gitaly/v15/internal/git"
"gitlab.com/gitlab-org/gitaly/v15/internal/structerr"
"gitlab.com/gitlab-org/gitaly/v15/proto/go/gitalypb"
)
func (s *server) FindRemoteRepository(ctx context.Context, req *gitalypb.FindRemoteRepositoryRequest) (*gitalypb.FindRemoteRepositoryResponse, error) {
if req.GetRemote() == "" {
return nil, structerr.NewInvalidArgument("empty remote can't be checked.")
}
cmd, err := s.gitCmdFactory.NewWithoutRepo(ctx,
git.Command{
Name: "ls-remote",
Args: []string{
req.GetRemote(),
"HEAD",
},
},
)
if err != nil {
return nil, structerr.NewInternal("error executing git command: %w", err)
}
output, err := io.ReadAll(cmd)
if err != nil {
return nil, structerr.NewInternal("unable to read stdout: %w", err)
}
if err := cmd.Wait(); err != nil {
return &gitalypb.FindRemoteRepositoryResponse{Exists: false}, nil
}
// The output of git-ls-remote is expected to be of the format:
//
// 58fbff2e0d3b620f591a748c158799ead87b51cd HEAD\n
objectID, refname, ok := bytes.Cut(output, []byte("\t"))
if !ok {
return &gitalypb.FindRemoteRepositoryResponse{Exists: false}, nil
}
// We've asked for HEAD, so the refname should match that.
if !bytes.Equal(refname, []byte("HEAD\n")) {
return &gitalypb.FindRemoteRepositoryResponse{Exists: false}, nil
}
// We have no way to ask the remote's object format via git-ls-remote(1), so all we can do
// is to verify that the object hash matches something we know.
switch len(objectID) {
case git.ObjectHashSHA1.EncodedLen():
return &gitalypb.FindRemoteRepositoryResponse{Exists: true}, nil
case git.ObjectHashSHA256.EncodedLen():
return &gitalypb.FindRemoteRepositoryResponse{Exists: true}, nil
default:
return &gitalypb.FindRemoteRepositoryResponse{Exists: false}, nil
}
}
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