Fix reverting a merge commit failing (#28794)

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
```
This commit is contained in:
Mihir Joshi 2024-01-16 20:36:51 +05:30 committed by GitHub
parent edfb57e699
commit b8270240bf
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
18 changed files with 98 additions and 9 deletions

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@ -669,3 +669,10 @@
type: 10 type: 10
config: "{}" config: "{}"
created_unix: 946684810 created_unix: 946684810
-
id: 101
repo_id: 59
type: 1
config: "{}"
created_unix: 946684810

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@ -1693,3 +1693,16 @@
size: 0 size: 0
is_fsck_enabled: true is_fsck_enabled: true
close_issues_via_commit_in_any_branch: false close_issues_via_commit_in_any_branch: false
-
id: 59
owner_id: 2
owner_name: user2
lower_name: test_commit_revert
name: test_commit_revert
default_branch: main
is_empty: false
is_archived: false
is_private: true
status: 0
num_issues: 0

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@ -66,7 +66,7 @@
num_followers: 2 num_followers: 2
num_following: 1 num_following: 1
num_stars: 2 num_stars: 2
num_repos: 14 num_repos: 15
num_teams: 0 num_teams: 0
num_members: 0 num_members: 0
visibility: 0 visibility: 0

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@ -267,7 +267,7 @@ func alterRepositoryContent(ctx context.Context, doer *user_model.User, repo *re
defer t.Close() defer t.Close()
var lastCommitID string var lastCommitID string
if err := t.Clone(repo.DefaultBranch); err != nil { if err := t.Clone(repo.DefaultBranch, true); err != nil {
if !git.IsErrBranchNotExist(err) || !repo.IsEmpty { if !git.IsErrBranchNotExist(err) || !repo.IsEmpty {
return err return err
} }

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@ -31,12 +31,15 @@ func CherryPick(ctx context.Context, repo *repo_model.Repository, doer *user_mod
log.Error("%v", err) log.Error("%v", err)
} }
defer t.Close() defer t.Close()
if err := t.Clone(opts.OldBranch); err != nil { if err := t.Clone(opts.OldBranch, false); err != nil {
return nil, err return nil, err
} }
if err := t.SetDefaultIndex(); err != nil { if err := t.SetDefaultIndex(); err != nil {
return nil, err return nil, err
} }
if err := t.RefreshIndex(); err != nil {
return nil, err
}
// Get the commit of the original branch // Get the commit of the original branch
commit, err := t.GetBranchCommit(opts.OldBranch) commit, err := t.GetBranchCommit(opts.OldBranch)

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@ -21,7 +21,7 @@ func GetDiffPreview(ctx context.Context, repo *repo_model.Repository, branch, tr
return nil, err return nil, err
} }
defer t.Close() defer t.Close()
if err := t.Clone(branch); err != nil { if err := t.Clone(branch, true); err != nil {
return nil, err return nil, err
} }
if err := t.SetDefaultIndex(); err != nil { if err := t.SetDefaultIndex(); err != nil {

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@ -113,7 +113,7 @@ func ApplyDiffPatch(ctx context.Context, repo *repo_model.Repository, doer *user
log.Error("%v", err) log.Error("%v", err)
} }
defer t.Close() defer t.Close()
if err := t.Clone(opts.OldBranch); err != nil { if err := t.Clone(opts.OldBranch, true); err != nil {
return nil, err return nil, err
} }
if err := t.SetDefaultIndex(); err != nil { if err := t.SetDefaultIndex(); err != nil {

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@ -51,8 +51,13 @@ func (t *TemporaryUploadRepository) Close() {
} }
// Clone the base repository to our path and set branch as the HEAD // Clone the base repository to our path and set branch as the HEAD
func (t *TemporaryUploadRepository) Clone(branch string) error { func (t *TemporaryUploadRepository) Clone(branch string, bare bool) error {
if _, _, err := git.NewCommand(t.ctx, "clone", "-s", "--bare", "-b").AddDynamicArguments(branch, t.repo.RepoPath(), t.basePath).RunStdString(nil); err != nil { cmd := git.NewCommand(t.ctx, "clone", "-s", "-b").AddDynamicArguments(branch, t.repo.RepoPath(), t.basePath)
if bare {
cmd.AddArguments("--bare")
}
if _, _, err := cmd.RunStdString(nil); err != nil {
stderr := err.Error() stderr := err.Error()
if matched, _ := regexp.MatchString(".*Remote branch .* not found in upstream origin.*", stderr); matched { if matched, _ := regexp.MatchString(".*Remote branch .* not found in upstream origin.*", stderr); matched {
return git.ErrBranchNotExist{ return git.ErrBranchNotExist{
@ -97,6 +102,14 @@ func (t *TemporaryUploadRepository) SetDefaultIndex() error {
return nil return nil
} }
// RefreshIndex looks at the current index and checks to see if merges or updates are needed by checking stat() information.
func (t *TemporaryUploadRepository) RefreshIndex() error {
if _, _, err := git.NewCommand(t.ctx, "update-index", "--refresh").RunStdString(&git.RunOpts{Dir: t.basePath}); err != nil {
return fmt.Errorf("RefreshIndex: %w", err)
}
return nil
}
// LsFiles checks if the given filename arguments are in the index // LsFiles checks if the given filename arguments are in the index
func (t *TemporaryUploadRepository) LsFiles(filenames ...string) ([]string, error) { func (t *TemporaryUploadRepository) LsFiles(filenames ...string) ([]string, error) {
stdOut := new(bytes.Buffer) stdOut := new(bytes.Buffer)

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@ -146,7 +146,7 @@ func ChangeRepoFiles(ctx context.Context, repo *repo_model.Repository, doer *use
} }
defer t.Close() defer t.Close()
hasOldBranch := true hasOldBranch := true
if err := t.Clone(opts.OldBranch); err != nil { if err := t.Clone(opts.OldBranch, true); err != nil {
for _, file := range opts.Files { for _, file := range opts.Files {
if file.Operation == "delete" { if file.Operation == "delete" {
return nil, err return nil, err

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@ -87,7 +87,7 @@ func UploadRepoFiles(ctx context.Context, repo *repo_model.Repository, doer *use
defer t.Close() defer t.Close()
hasOldBranch := true hasOldBranch := true
if err = t.Clone(opts.OldBranch); err != nil { if err = t.Clone(opts.OldBranch, true); err != nil {
if !git.IsErrBranchNotExist(err) || !repo.IsEmpty { if !git.IsErrBranchNotExist(err) || !repo.IsEmpty {
return err return err
} }

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@ -0,0 +1 @@
ref: refs/heads/main

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@ -0,0 +1,8 @@
[core]
repositoryformatversion = 0
filemode = true
bare = true
ignorecase = true
precomposeunicode = true
[remote "origin"]
url = https://try.gitea.io/me-heer/test_commit_revert.git

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@ -0,0 +1 @@
Unnamed repository; edit this file 'description' to name the repository.

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@ -0,0 +1,6 @@
# git ls-files --others --exclude-from=.git/info/exclude
# Lines that start with '#' are comments.
# For a project mostly in C, the following would be a good set of
# exclude patterns (uncomment them if you want to use them):
# *.[oa]
# *~

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@ -0,0 +1,3 @@
# pack-refs with: peeled fully-peeled sorted
46aa6ab2c881ae90e15d9ccfc947d1625c892ce5 refs/heads/develop
deebcbc752e540bab4ce3ee713d3fc8fdc35b2f7 refs/heads/main

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@ -0,0 +1,34 @@
package integration
import (
"net/http"
"testing"
"code.gitea.io/gitea/tests"
"github.com/stretchr/testify/assert"
)
func TestRepoMergeCommitRevert(t *testing.T) {
defer tests.PrepareTestEnv(t)()
session := loginUser(t, "user2")
req := NewRequest(t, "GET", "/user2/test_commit_revert/_cherrypick/deebcbc752e540bab4ce3ee713d3fc8fdc35b2f7/main?ref=main&refType=branch&cherry-pick-type=revert")
resp := session.MakeRequest(t, req, http.StatusOK)
htmlDoc := NewHTMLParser(t, resp.Body)
req = NewRequestWithValues(t, "POST", "/user2/test_commit_revert/_cherrypick/deebcbc752e540bab4ce3ee713d3fc8fdc35b2f7/main", map[string]string{
"_csrf": htmlDoc.GetCSRF(),
"last_commit": "deebcbc752e540bab4ce3ee713d3fc8fdc35b2f7",
"page_has_posted": "true",
"revert": "true",
"commit_summary": "reverting test commit",
"commit_message": "test message",
"commit_choice": "direct",
"new_branch_name": "test-revert-branch-1",
})
resp = session.MakeRequest(t, req, http.StatusSeeOther)
// A successful revert redirects to the main branch
assert.EqualValues(t, "/user2/test_commit_revert/src/branch/main", resp.Header().Get("Location"))
}