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package repository
import (
"context"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"gitlab.com/gitlab-org/gitaly/v14/internal/git"
"gitlab.com/gitlab-org/gitaly/v14/internal/git/catfile"
"gitlab.com/gitlab-org/gitaly/v14/internal/transaction/txinfo"
"gitlab.com/gitlab-org/gitaly/v14/internal/transaction/voting"
"gitlab.com/gitlab-org/gitaly/v14/proto/go/gitalypb"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
const attributesFileMode os.FileMode = 0644
func (s *server) applyGitattributes(ctx context.Context, c catfile.Batch, repoPath string, revision []byte) error {
infoPath := filepath.Join(repoPath, "info")
attributesPath := filepath.Join(infoPath, "attributes")
_, err := c.Info(ctx, git.Revision(revision))
if err != nil {
if catfile.IsNotFound(err) {
return status.Errorf(codes.InvalidArgument, "Revision doesn't exist")
}
return err
}
blobInfo, err := c.Info(ctx, git.Revision(fmt.Sprintf("%s:.gitattributes", revision)))
if err != nil && !catfile.IsNotFound(err) {
return err
}
if catfile.IsNotFound(err) || blobInfo.Type != "blob" {
// If there is no gitattributes file, we simply use the ZeroOID
// as a placeholder to vote on the removal.
if err := s.vote(ctx, git.ZeroOID); err != nil {
return fmt.Errorf("could not remove gitattributes: %w", err)
}
// Remove info/attributes file if there's no .gitattributes file
if err := os.Remove(attributesPath); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
// Create /info folder if it doesn't exist
if err := os.MkdirAll(infoPath, 0755); err != nil {
return err
}
tempFile, err := ioutil.TempFile(infoPath, "attributes")
if err != nil {
return status.Errorf(codes.Internal, "ApplyGitAttributes: creating temp file: %v", err)
}
defer os.Remove(tempFile.Name())
blobObj, err := c.Blob(ctx, git.Revision(blobInfo.Oid))
if err != nil {
return err
}
// Write attributes to temp file
if _, err := io.CopyN(tempFile, blobObj.Reader, blobInfo.Size); err != nil {
return err
}
if err := tempFile.Close(); err != nil {
return err
}
// Change the permission of tempFile as the permission of file attributesPath
if err := os.Chmod(tempFile.Name(), attributesFileMode); err != nil {
return err
}
// Vote on the contents of the newly written gitattributes file.
if err := s.vote(ctx, blobInfo.Oid); err != nil {
return fmt.Errorf("could not commit gitattributes: %w", err)
}
// Rename temp file and return the result
return os.Rename(tempFile.Name(), attributesPath)
}
func (s *server) vote(ctx context.Context, oid git.ObjectID) error {
tx, err := txinfo.TransactionFromContext(ctx)
if errors.Is(err, txinfo.ErrTransactionNotFound) {
return nil
}
praefect, err := txinfo.PraefectFromContext(ctx)
if err != nil {
return fmt.Errorf("vote has invalid Praefect info: %w", err)
}
hash, err := oid.Bytes()
if err != nil {
return fmt.Errorf("vote with invalid object ID: %w", err)
}
vote, err := voting.VoteFromHash(hash)
if err != nil {
return fmt.Errorf("cannot convert OID to vote: %w", err)
}
if err := s.txManager.Vote(ctx, tx, *praefect, vote); err != nil {
return fmt.Errorf("vote failed: %w", err)
}
return nil
}
func (s *server) ApplyGitattributes(ctx context.Context, in *gitalypb.ApplyGitattributesRequest) (*gitalypb.ApplyGitattributesResponse, error) {
repo := s.localrepo(in.GetRepository())
repoPath, err := s.locator.GetRepoPath(repo)
if err != nil {
return nil, err
}
if err := git.ValidateRevision(in.GetRevision()); err != nil {
return nil, status.Errorf(codes.InvalidArgument, "ApplyGitAttributes: revision: %v", err)
}
c, err := s.catfileCache.BatchProcess(ctx, repo)
if err != nil {
return nil, err
}
if err := s.applyGitattributes(ctx, c, repoPath, in.GetRevision()); err != nil {
return nil, err
}
return &gitalypb.ApplyGitattributesResponse{}, nil
}
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