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package objectpool
import (
"context"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"gitlab.com/gitlab-org/gitaly/v14/internal/git/localrepo"
"gitlab.com/gitlab-org/gitaly/v14/internal/gitaly/transaction"
"gitlab.com/gitlab-org/gitaly/v14/internal/safe"
)
// Link will link the given repository to the object pool. This is done by writing the object pool's
// path relative to the repository into the repository's "alternates" file. This does not trigger
// deduplication, which is the responsibility of the caller.
func (o *ObjectPool) Link(ctx context.Context, repo *localrepo.Repo) (returnedErr error) {
altPath, err := repo.InfoAlternatesPath()
if err != nil {
return err
}
expectedRelPath, err := o.getRelativeObjectPath(repo)
if err != nil {
return err
}
linked, err := o.LinkedToRepository(repo)
if err != nil {
return err
}
if linked {
return nil
}
alternatesWriter, err := safe.NewLockingFileWriter(altPath)
if err != nil {
return fmt.Errorf("creating alternates writer: %w", err)
}
defer func() {
if err := alternatesWriter.Close(); err != nil && returnedErr == nil {
returnedErr = fmt.Errorf("closing alternates writer: %w", err)
}
}()
if _, err := io.WriteString(alternatesWriter, expectedRelPath); err != nil {
return fmt.Errorf("writing alternates: %w", err)
}
if err := transaction.CommitLockedFile(ctx, o.txManager, alternatesWriter); err != nil {
return fmt.Errorf("committing alternates: %w", err)
}
return o.removeMemberBitmaps(repo)
}
// removeMemberBitmaps removes packfile bitmaps from the member
// repository that just joined the pool. If Git finds two packfiles with
// bitmaps it will print a warning, which is visible to the end user
// during a Git clone. Our goal is to avoid that warning. In normal
// operation, the next 'git gc' or 'git repack -ad' on the member
// repository will remove its local bitmap file. In other words the
// situation we eventually converge to is that the pool may have a bitmap
// but none of its members will. With removeMemberBitmaps we try to
// change "eventually" to "immediately", so that users won't see the
// warning. https://gitlab.com/gitlab-org/gitaly/issues/1728
func (o *ObjectPool) removeMemberBitmaps(repo *localrepo.Repo) error {
poolPath, err := o.Repo.Path()
if err != nil {
return err
}
poolBitmaps, err := getBitmaps(poolPath)
if err != nil {
return err
}
if len(poolBitmaps) == 0 {
return nil
}
repoPath, err := repo.Path()
if err != nil {
return err
}
memberBitmaps, err := getBitmaps(repoPath)
if err != nil {
return err
}
if len(memberBitmaps) == 0 {
return nil
}
for _, bitmap := range memberBitmaps {
if err := os.Remove(bitmap); err != nil && !os.IsNotExist(err) {
return err
}
}
return nil
}
func getBitmaps(repoPath string) ([]string, error) {
packDir := filepath.Join(repoPath, "objects/pack")
entries, err := os.ReadDir(packDir)
if err != nil {
return nil, err
}
var bitmaps []string
for _, entry := range entries {
if name := entry.Name(); strings.HasSuffix(name, ".bitmap") && strings.HasPrefix(name, "pack-") {
bitmaps = append(bitmaps, filepath.Join(packDir, name))
}
}
return bitmaps, nil
}
func (o *ObjectPool) getRelativeObjectPath(repo *localrepo.Repo) (string, error) {
repoPath, err := repo.Path()
if err != nil {
return "", err
}
relPath, err := filepath.Rel(filepath.Join(repoPath, "objects"), o.FullPath())
if err != nil {
return "", err
}
return filepath.Join(relPath, "objects"), nil
}
// LinkedToRepository tests if a repository is linked to an object pool
func (o *ObjectPool) LinkedToRepository(repo *localrepo.Repo) (bool, error) {
relPath, err := getAlternateObjectDir(repo)
if err != nil {
if err == ErrAlternateObjectDirNotExist {
return false, nil
}
return false, err
}
expectedRelPath, err := o.getRelativeObjectPath(repo)
if err != nil {
return false, err
}
if relPath == expectedRelPath {
return true, nil
}
if filepath.Clean(relPath) != filepath.Join(o.FullPath(), "objects") {
return false, fmt.Errorf("unexpected alternates content: %q", relPath)
}
return false, nil
}
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