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Fixes #22236
---
Error occurring currently while trying to revert commit using read-tree
-m approach:
> 2022/12/26 16:04:43 ...rvices/pull/patch.go:240:AttemptThreeWayMerge()
[E] [63a9c61a] Unable to run read-tree -m! Error: exit status 128 -
fatal: this operation must be run in a work tree
> - fatal: this operation must be run in a work tree
We need to clone a non-bare repository for `git read-tree -m` to work.
bb371aee6e
adds support to create a non-bare cloned temporary upload repository.
After cloning a non-bare temporary upload repository, we [set default
index](https://github.com/go-gitea/gitea/blob/main/services/repository/files/cherry_pick.go#L37)
(`git read-tree HEAD`).
This operation ends up resetting the git index file (see investigation
details below), due to which, we need to call `git update-index
--refresh` afterward.
Here's the diff of the index file before and after we execute
SetDefaultIndex: https://www.diffchecker.com/hyOP3eJy/
Notice the **ctime**, **mtime** are set to 0 after SetDefaultIndex.
You can reproduce the same behavior using these steps:
```bash
$ git clone https://try.gitea.io/me-heer/test.git -s -b main
$ cd test
$ git read-tree HEAD
$ git read-tree -m 1f085d7ed8 1f085d7ed8 9933caed00
error: Entry '1' not uptodate. Cannot merge.
```
After which, we can fix like this:
```
$ git update-index --refresh
$ git read-tree -m 1f085d7ed8 1f085d7ed8 9933caed00
```
226 lines
6.1 KiB
Go
226 lines
6.1 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package files
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import (
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"context"
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"fmt"
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"os"
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"path"
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"strings"
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git_model "code.gitea.io/gitea/models/git"
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repo_model "code.gitea.io/gitea/models/repo"
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user_model "code.gitea.io/gitea/models/user"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/lfs"
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"code.gitea.io/gitea/modules/setting"
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)
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// UploadRepoFileOptions contains the uploaded repository file options
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type UploadRepoFileOptions struct {
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LastCommitID string
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OldBranch string
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NewBranch string
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TreePath string
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Message string
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Files []string // In UUID format.
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Signoff bool
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}
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type uploadInfo struct {
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upload *repo_model.Upload
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lfsMetaObject *git_model.LFSMetaObject
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}
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func cleanUpAfterFailure(ctx context.Context, infos *[]uploadInfo, t *TemporaryUploadRepository, original error) error {
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for _, info := range *infos {
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if info.lfsMetaObject == nil {
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continue
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}
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if !info.lfsMetaObject.Existing {
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if _, err := git_model.RemoveLFSMetaObjectByOid(ctx, t.repo.ID, info.lfsMetaObject.Oid); err != nil {
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original = fmt.Errorf("%w, %v", original, err) // We wrap the original error - as this is the underlying error that required the fallback
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}
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}
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}
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return original
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}
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// UploadRepoFiles uploads files to the given repository
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func UploadRepoFiles(ctx context.Context, repo *repo_model.Repository, doer *user_model.User, opts *UploadRepoFileOptions) error {
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if len(opts.Files) == 0 {
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return nil
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}
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uploads, err := repo_model.GetUploadsByUUIDs(ctx, opts.Files)
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if err != nil {
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return fmt.Errorf("GetUploadsByUUIDs [uuids: %v]: %w", opts.Files, err)
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}
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names := make([]string, len(uploads))
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infos := make([]uploadInfo, len(uploads))
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for i, upload := range uploads {
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// Check file is not lfs locked, will return nil if lock setting not enabled
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filepath := path.Join(opts.TreePath, upload.Name)
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lfsLock, err := git_model.GetTreePathLock(ctx, repo.ID, filepath)
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if err != nil {
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return err
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}
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if lfsLock != nil && lfsLock.OwnerID != doer.ID {
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u, err := user_model.GetUserByID(ctx, lfsLock.OwnerID)
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if err != nil {
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return err
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}
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return git_model.ErrLFSFileLocked{RepoID: repo.ID, Path: filepath, UserName: u.Name}
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}
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names[i] = upload.Name
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infos[i] = uploadInfo{upload: upload}
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}
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t, err := NewTemporaryUploadRepository(ctx, repo)
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if err != nil {
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return err
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}
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defer t.Close()
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hasOldBranch := true
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if err = t.Clone(opts.OldBranch, true); err != nil {
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if !git.IsErrBranchNotExist(err) || !repo.IsEmpty {
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return err
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}
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if err = t.Init(repo.ObjectFormatName); err != nil {
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return err
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}
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hasOldBranch = false
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opts.LastCommitID = ""
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}
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if hasOldBranch {
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if err = t.SetDefaultIndex(); err != nil {
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return err
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}
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}
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var filename2attribute2info map[string]map[string]string
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if setting.LFS.StartServer {
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filename2attribute2info, err = t.gitRepo.CheckAttribute(git.CheckAttributeOpts{
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Attributes: []string{"filter"},
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Filenames: names,
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CachedOnly: true,
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})
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if err != nil {
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return err
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}
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}
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// Copy uploaded files into repository.
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for i := range infos {
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if err := copyUploadedLFSFileIntoRepository(&infos[i], filename2attribute2info, t, opts.TreePath); err != nil {
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return err
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}
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}
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// Now write the tree
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treeHash, err := t.WriteTree()
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if err != nil {
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return err
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}
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// make author and committer the doer
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author := doer
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committer := doer
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// Now commit the tree
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commitHash, err := t.CommitTree(opts.LastCommitID, author, committer, treeHash, opts.Message, opts.Signoff)
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if err != nil {
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return err
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}
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// Now deal with LFS objects
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for i := range infos {
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if infos[i].lfsMetaObject == nil {
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continue
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}
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infos[i].lfsMetaObject, err = git_model.NewLFSMetaObject(ctx, infos[i].lfsMetaObject.RepositoryID, infos[i].lfsMetaObject.Pointer)
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if err != nil {
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// OK Now we need to cleanup
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return cleanUpAfterFailure(ctx, &infos, t, err)
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}
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// Don't move the files yet - we need to ensure that
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// everything can be inserted first
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}
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// OK now we can insert the data into the store - there's no way to clean up the store
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// once it's in there, it's in there.
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contentStore := lfs.NewContentStore()
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for _, info := range infos {
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if err := uploadToLFSContentStore(info, contentStore); err != nil {
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return cleanUpAfterFailure(ctx, &infos, t, err)
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}
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}
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// Then push this tree to NewBranch
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if err := t.Push(doer, commitHash, opts.NewBranch); err != nil {
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return err
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}
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return repo_model.DeleteUploads(ctx, uploads...)
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}
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func copyUploadedLFSFileIntoRepository(info *uploadInfo, filename2attribute2info map[string]map[string]string, t *TemporaryUploadRepository, treePath string) error {
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file, err := os.Open(info.upload.LocalPath())
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if err != nil {
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return err
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}
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defer file.Close()
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var objectHash string
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if setting.LFS.StartServer && filename2attribute2info[info.upload.Name] != nil && filename2attribute2info[info.upload.Name]["filter"] == "lfs" {
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// Handle LFS
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// FIXME: Inefficient! this should probably happen in models.Upload
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pointer, err := lfs.GeneratePointer(file)
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if err != nil {
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return err
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}
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info.lfsMetaObject = &git_model.LFSMetaObject{Pointer: pointer, RepositoryID: t.repo.ID}
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if objectHash, err = t.HashObject(strings.NewReader(pointer.StringContent())); err != nil {
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return err
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}
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} else if objectHash, err = t.HashObject(file); err != nil {
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return err
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}
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// Add the object to the index
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return t.AddObjectToIndex("100644", objectHash, path.Join(treePath, info.upload.Name))
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}
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func uploadToLFSContentStore(info uploadInfo, contentStore *lfs.ContentStore) error {
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if info.lfsMetaObject == nil {
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return nil
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}
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exist, err := contentStore.Exists(info.lfsMetaObject.Pointer)
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if err != nil {
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return err
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}
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if !exist {
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file, err := os.Open(info.upload.LocalPath())
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if err != nil {
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return err
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}
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defer file.Close()
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// FIXME: Put regenerates the hash and copies the file over.
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// I guess this strictly ensures the soundness of the store but this is inefficient.
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if err := contentStore.Put(info.lfsMetaObject.Pointer, file); err != nil {
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// OK Now we need to cleanup
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// Can't clean up the store, once uploaded there they're there.
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return err
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}
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}
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return nil
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}
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