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54a6dc73ef
Backport https://github.com/go-gitea/gitea/pull/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.bb371aee6eadds 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: ```bash $ git update-index --refresh $ git read-tree -m 1f085d7ed8 1f085d7ed8 9933caed00 ``` (cherry picked from commit62f2d717b7)
42 lines
1 KiB
Go
42 lines
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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"strings"
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repo_model "code.gitea.io/gitea/models/repo"
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"code.gitea.io/gitea/services/gitdiff"
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)
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// GetDiffPreview produces and returns diff result of a file which is not yet committed.
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func GetDiffPreview(ctx context.Context, repo *repo_model.Repository, branch, treePath, content string) (*gitdiff.Diff, error) {
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if branch == "" {
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branch = repo.DefaultBranch
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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 nil, err
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}
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defer t.Close()
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if err := t.Clone(branch, true); err != nil {
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return nil, err
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}
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if err := t.SetDefaultIndex(); err != nil {
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return nil, err
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}
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// Add the object to the database
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objectHash, err := t.HashObject(strings.NewReader(content))
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if err != nil {
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return nil, err
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}
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// Add the object to the index
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if err := t.AddObjectToIndex("100644", objectHash, treePath); err != nil {
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return nil, err
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}
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return t.DiffIndex()
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}
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