/
reference.go
128 lines (101 loc) · 2.7 KB
/
reference.go
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package storage
import (
"io"
"os"
"strings"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/storer"
"github.com/go-git/go-git/v5/storage"
ufs "github.com/ipfs/go-unixfs"
"github.com/valist-io/go-ipfs-git/storage/unixfs"
)
type ReferenceStorage struct {
fs *unixfs.Unixfs
}
func NewReferenceStorage(fs *unixfs.Unixfs) ReferenceStorage {
return ReferenceStorage{fs}
}
func (r *ReferenceStorage) SetReference(ref *plumbing.Reference) error {
parts := ref.Strings()
name, target := parts[0], parts[1]
return r.fs.Write(name, strings.NewReader(target))
}
// CheckAndSetReference sets the reference `new`, but if `old` is
// not `nil`, it first checks that the current stored value for
// `old.Name()` matches the given reference value in `old`. If
// not, it returns an error and doesn't update `new`.
func (r *ReferenceStorage) CheckAndSetReference(ref, old *plumbing.Reference) error {
if old == nil {
return r.SetReference(ref)
}
tmp, err := r.Reference(old.Name())
if err != nil {
return storage.ErrReferenceHasChanged
}
if tmp.Hash() != old.Hash() {
return storage.ErrReferenceHasChanged
}
return r.SetReference(ref)
}
func (r *ReferenceStorage) Reference(n plumbing.ReferenceName) (*plumbing.Reference, error) {
fr, err := r.fs.Read(n.String())
if err == os.ErrNotExist {
return nil, plumbing.ErrReferenceNotFound
} else if err != nil {
return nil, err
}
defer fr.Close()
target, err := io.ReadAll(fr)
if err != nil {
return nil, err
}
return plumbing.NewReferenceFromStrings(n.String(), string(target)), nil
}
func (r *ReferenceStorage) IterReferences() (storer.ReferenceIter, error) {
refs, err := r.References()
if err != nil {
return nil, err
}
return storer.NewReferenceSliceIter(refs), nil
}
func (r *ReferenceStorage) References() ([]*plumbing.Reference, error) {
var refs []*plumbing.Reference
head, err := r.Reference("HEAD")
if err == nil {
refs = append(refs, head)
} else if err != plumbing.ErrReferenceNotFound {
return nil, err
}
walk := func(fpath string, node *ufs.FSNode) error {
if node.IsDir() {
return nil
}
ref, err := r.Reference(plumbing.ReferenceName(fpath))
if err != nil {
return err
}
refs = append(refs, ref)
return nil
}
if err := r.fs.Walk(unixfs.RefsPath, walk); err != nil {
return nil, err
}
return refs, nil
}
func (r *ReferenceStorage) CountLooseRefs() (int, error) {
refs, err := r.References()
if err != nil {
return 0, err
}
return len(refs), nil
}
func (r *ReferenceStorage) PackRefs() error {
return nil
}
func (r *ReferenceStorage) RemoveReference(n plumbing.ReferenceName) error {
err := r.fs.Remove(n.String())
if err == os.ErrNotExist {
return nil
}
return err
}