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f74c869221
Fixes the reason why #29101 is hard to replicate.
Related #29297
Create a repo with a file with minimum size 4097 bytes (I use 10000) and
execute the following code:
```go
gitRepo, err := gitrepo.OpenRepository(db.DefaultContext, <repo>)
assert.NoError(t, err)
commit, err := gitRepo.GetCommit(<sha>)
assert.NoError(t, err)
entry, err := commit.GetTreeEntryByPath(<file>)
assert.NoError(t, err)
b := entry.Blob()
// Create a reader
r, err := b.DataAsync()
assert.NoError(t, err)
defer r.Close()
// Create a second reader
r2, err := b.DataAsync()
assert.NoError(t, err) // Should be no error but is ErrNotExist
defer r2.Close()
```
The problem is the check in `CatFileBatch`:
79217ea63c/modules/git/repo_base_nogogit.go (L81-L87)
`Buffered() > 0` is used to check if there is a "operation" in progress
at the moment. This is a problem because we can't control the internal
buffer in the `bufio.Reader`. The code above demonstrates a sequence
which initiates an operation for which the code thinks there is no
active processing. The second call to `DataAsync()` therefore reuses the
existing instances instead of creating a new batch reader.
128 lines
3.2 KiB
Go
128 lines
3.2 KiB
Go
// Copyright 2015 The Gogs Authors. All rights reserved.
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// Copyright 2017 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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//go:build !gogit
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package git
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import (
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"bufio"
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"context"
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"errors"
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"path/filepath"
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"code.gitea.io/gitea/modules/log"
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)
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func init() {
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isGogit = false
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}
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// Repository represents a Git repository.
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type Repository struct {
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Path string
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tagCache *ObjectCache
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gpgSettings *GPGSettings
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batchInUse bool
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batchCancel context.CancelFunc
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batchReader *bufio.Reader
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batchWriter WriteCloserError
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checkInUse bool
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checkCancel context.CancelFunc
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checkReader *bufio.Reader
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checkWriter WriteCloserError
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Ctx context.Context
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LastCommitCache *LastCommitCache
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objectFormat ObjectFormat
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}
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// openRepositoryWithDefaultContext opens the repository at the given path with DefaultContext.
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func openRepositoryWithDefaultContext(repoPath string) (*Repository, error) {
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return OpenRepository(DefaultContext, repoPath)
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}
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// OpenRepository opens the repository at the given path with the provided context.
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func OpenRepository(ctx context.Context, repoPath string) (*Repository, error) {
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repoPath, err := filepath.Abs(repoPath)
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if err != nil {
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return nil, err
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} else if !isDir(repoPath) {
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return nil, errors.New("no such file or directory")
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}
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// Now because of some insanity with git cat-file not immediately failing if not run in a valid git directory we need to run git rev-parse first!
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if err := EnsureValidGitRepository(ctx, repoPath); err != nil {
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return nil, err
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}
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repo := &Repository{
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Path: repoPath,
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tagCache: newObjectCache(),
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Ctx: ctx,
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}
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repo.batchWriter, repo.batchReader, repo.batchCancel = CatFileBatch(ctx, repoPath)
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repo.checkWriter, repo.checkReader, repo.checkCancel = CatFileBatchCheck(ctx, repoPath)
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repo.objectFormat, err = repo.GetObjectFormat()
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if err != nil {
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return nil, err
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}
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return repo, nil
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}
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// CatFileBatch obtains a CatFileBatch for this repository
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func (repo *Repository) CatFileBatch(ctx context.Context) (WriteCloserError, *bufio.Reader, func()) {
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if repo.batchCancel == nil || repo.batchInUse {
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log.Debug("Opening temporary cat file batch for: %s", repo.Path)
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return CatFileBatch(ctx, repo.Path)
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}
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repo.batchInUse = true
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return repo.batchWriter, repo.batchReader, func() {
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repo.batchInUse = false
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}
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}
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// CatFileBatchCheck obtains a CatFileBatchCheck for this repository
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func (repo *Repository) CatFileBatchCheck(ctx context.Context) (WriteCloserError, *bufio.Reader, func()) {
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if repo.checkCancel == nil || repo.checkInUse {
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log.Debug("Opening temporary cat file batch-check for: %s", repo.Path)
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return CatFileBatchCheck(ctx, repo.Path)
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}
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repo.checkInUse = true
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return repo.checkWriter, repo.checkReader, func() {
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repo.checkInUse = false
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}
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}
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func (repo *Repository) Close() (err error) {
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if repo == nil {
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return nil
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}
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if repo.batchCancel != nil {
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repo.batchCancel()
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repo.batchReader = nil
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repo.batchWriter = nil
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repo.batchCancel = nil
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repo.batchInUse = false
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}
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if repo.checkCancel != nil {
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repo.checkCancel()
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repo.checkCancel = nil
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repo.checkReader = nil
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repo.checkWriter = nil
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repo.checkInUse = false
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}
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repo.LastCommitCache = nil
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repo.tagCache = nil
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return err
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}
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