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package repository
import (
"bufio"
"bytes"
"context"
"encoding/hex"
"strings"
gitalyerrors "gitlab.com/gitlab-org/gitaly/v15/internal/errors"
"gitlab.com/gitlab-org/gitaly/v15/internal/git"
"gitlab.com/gitlab-org/gitaly/v15/internal/helper"
"gitlab.com/gitlab-org/gitaly/v15/proto/go/gitalypb"
)
func (s *server) CalculateChecksum(ctx context.Context, in *gitalypb.CalculateChecksumRequest) (*gitalypb.CalculateChecksumResponse, error) {
repo := in.GetRepository()
if repo == nil {
return nil, helper.ErrInvalidArgument(gitalyerrors.ErrEmptyRepository)
}
repoPath, err := s.locator.GetRepoPath(repo)
if err != nil {
return nil, err
}
cmd, err := s.gitCmdFactory.New(ctx, repo, git.SubCmd{Name: "show-ref", Flags: []git.Option{git.Flag{Name: "--head"}}})
if err != nil {
return nil, helper.ErrInternalf("gitCommand: %w", err)
}
var checksum git.Checksum
scanner := bufio.NewScanner(cmd)
for scanner.Scan() {
checksum.AddBytes(scanner.Bytes())
}
if err := scanner.Err(); err != nil {
return nil, helper.ErrInternal(err)
}
if err := cmd.Wait(); checksum.IsZero() || err != nil {
if s.isValidRepo(ctx, repo) {
return &gitalypb.CalculateChecksumResponse{Checksum: git.ObjectHashSHA1.ZeroOID.String()}, nil
}
return nil, helper.ErrDataLossf("not a git repository '%s'", repoPath)
}
return &gitalypb.CalculateChecksumResponse{Checksum: hex.EncodeToString(checksum.Bytes())}, nil
}
func (s *server) isValidRepo(ctx context.Context, repo *gitalypb.Repository) bool {
stdout := &bytes.Buffer{}
cmd, err := s.gitCmdFactory.New(ctx, repo,
git.SubCmd{
Name: "rev-parse",
Flags: []git.Option{
git.Flag{Name: "--is-bare-repository"},
},
},
git.WithStdout(stdout),
)
if err != nil {
return false
}
if err := cmd.Wait(); err != nil {
return false
}
return strings.EqualFold(strings.TrimRight(stdout.String(), "\n"), "true")
}
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