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package githistory
import (
"bytes"
"encoding/hex"
"fmt"
"io"
"strings"
"github.com/git-lfs/git-lfs/v3/errors"
"github.com/git-lfs/git-lfs/v3/git"
"github.com/git-lfs/git-lfs/v3/tasklog"
"github.com/git-lfs/git-lfs/v3/tr"
"github.com/git-lfs/gitobj/v2"
)
// refUpdater is a type responsible for moving references from one point in the
// Git object graph to another.
type refUpdater struct {
// cacheFn is a function that returns the SHA1 transformation from an
// original hash to a new one. It specifies a "bool" return value
// signaling whether or not that given "old" SHA1 was migrated.
cacheFn func(old []byte) ([]byte, bool)
// logger logs the progress of reference updating.
logger *tasklog.Logger
// refs is a set of *git.Ref's to migrate.
refs []*git.Ref
// root is the given directory on disk in which the repository is
// located.
root string
// db is the *ObjectDatabase from which blobs, commits, and trees are
// loaded.
db *gitobj.ObjectDatabase
}
// updateRefs performs the reference update(s) from existing locations (see:
// Refs) to their respective new locations in the graph (see CacheFn).
//
// It creates reflog entries as well as stderr log entries as it progresses
// through the reference updates.
//
// It returns any error encountered, or nil if the reference update(s) was/were
// successful.
func (r *refUpdater) updateRefs() error {
list := r.logger.List(tr.Tr.Get("Updating refs"))
defer list.Complete()
var maxNameLen int
for _, ref := range r.refs {
maxNameLen = max(maxNameLen, len(ref.Name))
}
cmd, err := git.UpdateRefsFromStdin(r.root)
if err != nil {
return err
}
var output bytes.Buffer
cmd.Stdout = &output
cmd.Stderr = &output
input, err := cmd.StdinPipe()
if err != nil {
return err
}
err = cmd.Start()
if err != nil {
return err
}
defer func() {
if cmd != nil {
cmd.Wait()
}
}()
gitUpRefTransactions := git.IsGitVersionAtLeast("2.27.0")
if gitUpRefTransactions {
if _, err = io.WriteString(input, "start\x00"); err != nil {
return err
}
}
seen := make(map[string][]byte)
for _, ref := range r.refs {
if err := r.updateOneRef(list, maxNameLen, seen, ref, input); err != nil {
return err
}
}
if gitUpRefTransactions {
if _, err = io.WriteString(input, "prepare\x00commit\x00"); err != nil {
return err
}
}
if err = input.Close(); err != nil {
return err
}
err = cmd.Wait()
cmd = nil
if err != nil {
return fmt.Errorf("git update-ref failed: %s, output: %s", err.Error(), output.String())
}
return nil
}
func (r *refUpdater) updateOneTag(tag *gitobj.Tag, toObj []byte) ([]byte, error) {
newTag, err := r.db.WriteTag(&gitobj.Tag{
Object: toObj,
ObjectType: tag.ObjectType,
Name: tag.Name,
Tagger: tag.Tagger,
Message: tag.Message,
})
if err != nil {
return nil, errors.Wrap(err, tr.Tr.Get("could not rewrite tag: %s", tag.Name))
}
return newTag, nil
}
func (r *refUpdater) updateOneRef(list *tasklog.ListTask, maxNameLen int, seen map[string][]byte, ref *git.Ref, gitUpRefIn io.WriteCloser) error {
sha1, err := hex.DecodeString(ref.Sha)
if err != nil {
return errors.Wrap(err, tr.Tr.Get("could not decode: %q", ref.Sha))
}
refspec := ref.Refspec()
if _, ok := seen[refspec]; ok {
return nil
}
to, ok := r.cacheFn(sha1)
if ref.Type == git.RefTypeLocalTag {
tag, _ := r.db.Tag(sha1)
if tag != nil && tag.ObjectType == gitobj.TagObjectType {
innerTag, _ := r.db.Tag(tag.Object)
name := fmt.Sprintf("refs/tags/%s", innerTag.Name)
if _, ok := seen[name]; !ok {
old, err := git.ResolveRef(name)
if err != nil {
return err
}
err = r.updateOneRef(list, maxNameLen, seen, old, gitUpRefIn)
if err != nil {
return err
}
}
updatedSha, refUpOk := seen[name]
if !refUpOk {
return nil
}
newTag, err := r.updateOneTag(tag, updatedSha)
if newTag == nil {
return err
}
to = newTag
ok = true
} else if tag != nil && tag.ObjectType == gitobj.CommitObjectType {
toObj, okObj := r.cacheFn(tag.Object)
if !okObj {
return nil
}
newTag, err := r.updateOneTag(tag, toObj)
if newTag == nil {
return err
}
to = newTag
ok = true
}
}
if !ok {
return nil
}
if _, err = io.WriteString(gitUpRefIn, fmt.Sprintf("update %s\x00%s\x00\x00", ref.Refspec(), hex.EncodeToString(to))); err != nil {
return err
}
namePadding := max(maxNameLen-len(ref.Name), 0)
list.Entry(fmt.Sprintf(" %s%s\t%s -> %x", ref.Name, strings.Repeat(" ", namePadding), ref.Sha, to))
seen[refspec] = to
return nil
}
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