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Fix data-race problems in git module (quick patch) (#19934)

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* Fix data-race problems in git module

* use HomeDir instead of setting.RepoRootPath

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
wxiaoguang 2022-06-11 11:56:27 +08:00 • committed by GitHub
parent 23422f9909
commit 88f2e457d8
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8 changed files with 46 additions and 55 deletions
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80
modules/git/git.go
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@ -34,15 +34,12 @@ var (
GitExecutable = "git"
// DefaultContext is the default context to run git commands in
// will be overwritten by InitWithConfigSync with HammerContext
// will be overwritten by InitXxx with HammerContext
DefaultContext = context.Background()
// SupportProcReceive version >= 2.29.0
SupportProcReceive bool
// initMutex is used to avoid Golang's data race error. see the comments below.
initMutex sync.Mutex
gitVersion *version.Version
)
@ -131,15 +128,6 @@ func VersionInfo() string {
return fmt.Sprintf(format, args...)
}
// InitSimple initializes git module with a very simple step, no config changes, no global command arguments.
// This method doesn't change anything to filesystem
func InitSimple(ctx context.Context) error {
initMutex.Lock()
defer initMutex.Unlock()
return initSimpleInternal(ctx)
}
// HomeDir is the home dir for git to store the global config file used by Gitea internally
func HomeDir() string {
if setting.RepoRootPath == "" {
@ -153,11 +141,9 @@ func HomeDir() string {
return setting.RepoRootPath
}
func initSimpleInternal(ctx context.Context) error {
// at the moment, when running integration tests, the git.InitXxx would be called twice.
// one is called by the GlobalInitInstalled, one is called by TestMain.
// so the init functions should be protected by a mutex to avoid Golang's data race error.
// InitSimple initializes git module with a very simple step, no config changes, no global command arguments.
// This method doesn't change anything to filesystem. At the moment, it is only used by "git serv" sub-command, no data-race
func InitSimple(ctx context.Context) error {
DefaultContext = ctx
if setting.Git.Timeout.Default > 0 {
@ -174,35 +160,47 @@ func initSimpleInternal(ctx context.Context) error {
return nil
}
// InitWithConfigSync initializes git module. This method may create directories or write files into filesystem
func InitWithConfigSync(ctx context.Context) error {
initMutex.Lock()
defer initMutex.Unlock()
var initOnce sync.Once
err := initSimpleInternal(ctx)
// InitOnceWithSync initializes git module with version check and change global variables, sync gitconfig.
// This method will update the global variables ONLY ONCE (just like git.CheckLFSVersion -- which is not ideal too),
// otherwise there will be data-race problem at the moment.
func InitOnceWithSync(ctx context.Context) (err error) {
initOnce.Do(func() {
err = InitSimple(ctx)
if err != nil {
return
}
// Since git wire protocol has been released from git v2.18
if setting.Git.EnableAutoGitWireProtocol && CheckGitVersionAtLeast("2.18") == nil {
globalCommandArgs = append(globalCommandArgs, "-c", "protocol.version=2")
}
// By default partial clones are disabled, enable them from git v2.22
if !setting.Git.DisablePartialClone && CheckGitVersionAtLeast("2.22") == nil {
globalCommandArgs = append(globalCommandArgs, "-c", "uploadpack.allowfilter=true", "-c", "uploadpack.allowAnySHA1InWant=true")
}
// Explicitly disable credential helper, otherwise Git credentials might leak
if CheckGitVersionAtLeast("2.9") == nil {
globalCommandArgs = append(globalCommandArgs, "-c", "credential.helper=")
}
SupportProcReceive = CheckGitVersionAtLeast("2.29") == nil
})
if err != nil {
return err
}
return syncGitConfig()
}
if err = os.MkdirAll(setting.RepoRootPath, os.ModePerm); err != nil {
// syncGitConfig only modifies gitconfig, won't change global variables (otherwise there will be data-race problem)
func syncGitConfig() (err error) {
if err = os.MkdirAll(HomeDir(), os.ModePerm); err != nil {
return fmt.Errorf("unable to create directory %s, err: %w", setting.RepoRootPath, err)
}
if CheckGitVersionAtLeast("2.9") == nil {
// Explicitly disable credential helper, otherwise Git credentials might leak
globalCommandArgs = append(globalCommandArgs, "-c", "credential.helper=")
}
// Since git wire protocol has been released from git v2.18
if setting.Git.EnableAutoGitWireProtocol && CheckGitVersionAtLeast("2.18") == nil {
globalCommandArgs = append(globalCommandArgs, "-c", "protocol.version=2")
}
// By default partial clones are disabled, enable them from git v2.22
if !setting.Git.DisablePartialClone && CheckGitVersionAtLeast("2.22") == nil {
globalCommandArgs = append(globalCommandArgs, "-c", "uploadpack.allowfilter=true", "-c", "uploadpack.allowAnySHA1InWant=true")
}
// Git requires setting user.name and user.email in order to commit changes - old comment: "if they're not set just add some defaults"
// TODO: need to confirm whether users really need to change these values manually. It seems that these values are dummy only and not really used.
// If these values are not really used, then they can be set (overwritten) directly without considering about existence.
@ -235,17 +233,15 @@ func InitWithConfigSync(ctx context.Context) error {
}
}
if CheckGitVersionAtLeast("2.29") == nil {
if SupportProcReceive {
// set support for AGit flow
if err := configAddNonExist("receive.procReceiveRefs", "refs/for"); err != nil {
return err
}
SupportProcReceive = true
} else {
if err := configUnsetAll("receive.procReceiveRefs", "refs/for"); err != nil {
return err
}
SupportProcReceive = false
}
if runtime.GOOS == "windows" {