func (r *Runner) makeOutRepo(pipeline string) error {
if err := btrfs.Ensure(path.Join(r.outPrefix, pipeline)); err != nil {
return err
}
exists, err := btrfs.FileExists(path.Join(r.outPrefix, pipeline, r.branch))
if err != nil {
return err
}
if !exists {
// The branch doesn't exist, we need to create it We'll make our branch
// have the same parent as the commit we're running off of if that
// parent exists in the pipelines outRepo. This lets us carry over past
// computation results when a new branch is created rather than having
// to start from scratch.
parent := btrfs.GetMeta(path.Join(r.inRepo, r.commit), "parent")
if parent != "" {
exists, err := btrfs.FileExists(path.Join(r.outPrefix, pipeline, parent))
if err != nil {
return err
}
if !exists {
parent = ""
}
}
if err := btrfs.Branch(path.Join(r.outPrefix, pipeline), parent, r.branch); err != nil {
return err
}
}
// The branch exists, so we're ready to return
return nil
}
func (s *shard) BranchCreate(name string, commit string) (Branch, error) {
if err := btrfs.Branch(s.dataRepo, commit, name); err != nil {
return Branch{}, nil
}
return s.BranchGet(name)
}