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package repository
import (
"bytes"
"context"
"fmt"
"gitlab.com/gitlab-org/gitaly/v15/structerr"
"gitlab.com/gitlab-org/gitaly/proto/v15/go/gitalypb"
"gitlab.com/gitlab-org/gitaly/v15/internal/git"
"gitlab.com/gitlab-org/gitaly/v15/internal/git/localrepo"
"gitlab.com/gitlab-org/gitaly/v15/internal/git/updateref"
"gitlab.com/gitlab-org/gitaly/v15/internal/gitaly/service"
)
func (s *server) WriteRef(ctx context.Context, req *gitalypb.WriteRefRequest) (*gitalypb.WriteRefResponse, error) {
if err := validateWriteRefRequest(req); err != nil {
return nil, structerr.NewInvalidArgument("%w", err)
}
if err := s.writeRef(ctx, req); err != nil {
return nil, structerr.NewInternal("%w", err)
}
return &gitalypb.WriteRefResponse{}, nil
}
func (s *server) writeRef(ctx context.Context, req *gitalypb.WriteRefRequest) error {
repo := s.localrepo(req.GetRepository())
if string(req.Ref) == "HEAD" {
if err := repo.SetDefaultBranch(ctx, s.txManager, git.ReferenceName(req.GetRevision())); err != nil {
return fmt.Errorf("setting default branch: %w", err)
}
return nil
}
return updateRef(ctx, repo, req)
}
func updateRef(ctx context.Context, repo *localrepo.Repo, req *gitalypb.WriteRefRequest) (returnedErr error) {
var newObjectID git.ObjectID
if git.ObjectHashSHA1.IsZeroOID(git.ObjectID(req.GetRevision())) {
// Passing the all-zeroes object ID as new value means that we should delete the
// reference.
newObjectID = git.ObjectHashSHA1.ZeroOID
} else {
// We need to resolve the new revision in order to make sure that we're actually
// passing an object ID to git-update-ref(1), but more importantly this will also
// ensure that the object ID we're updating to actually exists. Note that we also
// verify that the object actually exists in the repository by adding "^{object}".
var err error
newObjectID, err = repo.ResolveRevision(ctx, git.Revision(req.GetRevision())+"^{object}")
if err != nil {
return fmt.Errorf("resolving new revision: %w", err)
}
}
var oldObjectID git.ObjectID
if len(req.GetOldRevision()) > 0 {
if git.ObjectHashSHA1.IsZeroOID(git.ObjectID(req.GetOldRevision())) {
// Passing an all-zeroes object ID indicates that we should only update the
// reference if it didn't previously exist.
oldObjectID = git.ObjectHashSHA1.ZeroOID
} else {
var err error
oldObjectID, err = repo.ResolveRevision(ctx, git.Revision(req.GetOldRevision())+"^{object}")
if err != nil {
return fmt.Errorf("resolving old revision: %w", err)
}
}
}
u, err := updateref.New(ctx, repo)
if err != nil {
return fmt.Errorf("error when running creating new updater: %v", err)
}
defer func() {
if err := u.Close(); err != nil && returnedErr == nil {
returnedErr = fmt.Errorf("close updater: %w", err)
}
}()
if err := u.Start(); err != nil {
return fmt.Errorf("start reference transaction: %w", err)
}
if err = u.Update(git.ReferenceName(req.GetRef()), newObjectID, oldObjectID); err != nil {
return fmt.Errorf("error when creating update-ref command: %v", err)
}
if err = u.Commit(); err != nil {
return fmt.Errorf("error when running update-ref command: %v", err)
}
return nil
}
func validateWriteRefRequest(req *gitalypb.WriteRefRequest) error {
if err := service.ValidateRepository(req.GetRepository()); err != nil {
return err
}
if err := git.ValidateRevision(req.Ref); err != nil {
return fmt.Errorf("invalid ref: %v", err)
}
if err := git.ValidateRevision(req.Revision); err != nil {
return fmt.Errorf("invalid revision: %v", err)
}
if len(req.OldRevision) > 0 {
if err := git.ValidateRevision(req.OldRevision); err != nil {
return fmt.Errorf("invalid OldRevision: %v", err)
}
}
if !bytes.Equal(req.Ref, []byte("HEAD")) && !bytes.HasPrefix(req.Ref, []byte("refs/")) {
return fmt.Errorf("ref has to be a full reference")
}
return nil
}
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