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Refactor git.Command.Run*, introduce RunWithContextString and RunWithContextBytes (#19266)

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This follows 
* https://github.com/go-gitea/gitea/issues/18553

Introduce `RunWithContextString` and `RunWithContextBytes` to help the refactoring. Add related unit tests. They keep the same behavior to save stderr into err.Error() as `RunInXxx` before.

Remove `RunInDirTimeoutPipeline` `RunInDirTimeoutFullPipeline` `RunInDirTimeout` `RunInDirTimeoutEnv`  `RunInDirPipeline`  `RunInDirFullPipeline`  `RunTimeout`, `RunInDirTimeoutEnvPipeline`, `RunInDirTimeoutEnvFullPipeline`, `RunInDirTimeoutEnvFullPipelineFunc`.

Then remaining `RunInDir` `RunInDirBytes` `RunInDirWithEnv` can be easily refactored in next PR with a simple search & replace:
* before: `stdout, err := RunInDir(path)`
* next: `stdout, _, err := RunWithContextString(&git.RunContext{Dir:path})`

Other changes:
1. When `timeout <= 0`, use default. Because `timeout==0` is meaningless and could cause bugs. And now many functions becomes more simple, eg: `GitGcRepos` 9 lines to 1 line. `Fsck` 6 lines to 1 line.
2. Only set defaultCommandExecutionTimeout when the option `setting.Git.Timeout.Default > 0`
This commit is contained in:
wxiaoguang 2022-03-31 19:56:22 +08:00 committed by GitHub
parent d4f84f1c93
commit b877504b03
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
8 changed files with 129 additions and 129 deletions
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142
modules/git/command.go
View file

@ -14,6 +14,7 @@ import (
"os/exec"
"strings"
"time"
"unsafe"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/process"
@ -93,32 +94,6 @@ func (c *Command) AddArguments(args ...string) *Command {
return c
}
// RunInDirTimeoutEnvPipeline executes the command in given directory with given timeout,
// it pipes stdout and stderr to given io.Writer.
func (c *Command) RunInDirTimeoutEnvPipeline(env []string, timeout time.Duration, dir string, stdout, stderr io.Writer) error {
return c.RunInDirTimeoutEnvFullPipeline(env, timeout, dir, stdout, stderr, nil)
}
// RunInDirTimeoutEnvFullPipeline executes the command in given directory with given timeout,
// it pipes stdout and stderr to given io.Writer and passes in an io.Reader as stdin.
func (c *Command) RunInDirTimeoutEnvFullPipeline(env []string, timeout time.Duration, dir string, stdout, stderr io.Writer, stdin io.Reader) error {
return c.RunInDirTimeoutEnvFullPipelineFunc(env, timeout, dir, stdout, stderr, stdin, nil)
}
// RunInDirTimeoutEnvFullPipelineFunc executes the command in given directory with given timeout,
// it pipes stdout and stderr to given io.Writer and passes in an io.Reader as stdin. Between cmd.Start and cmd.Wait the passed in function is run.
func (c *Command) RunInDirTimeoutEnvFullPipelineFunc(env []string, timeout time.Duration, dir string, stdout, stderr io.Writer, stdin io.Reader, fn func(context.Context, context.CancelFunc) error) error {
return c.RunWithContext(&RunContext{
Env: env,
Timeout: timeout,
Dir: dir,
Stdout: stdout,
Stderr: stderr,
Stdin: stdin,
PipelineFunc: fn,
})
}
// RunContext represents parameters to run the command
type RunContext struct {
Env []string
@ -131,7 +106,7 @@ type RunContext struct {
// RunWithContext run the command with context
func (c *Command) RunWithContext(rc *RunContext) error {
if rc.Timeout == -1 {
if rc.Timeout <= 0 {
rc.Timeout = defaultCommandExecutionTimeout
}
@ -203,58 +178,73 @@ func (c *Command) RunWithContext(rc *RunContext) error {
return ctx.Err()
}
// RunInDirTimeoutPipeline executes the command in given directory with given timeout,
// it pipes stdout and stderr to given io.Writer.
func (c *Command) RunInDirTimeoutPipeline(timeout time.Duration, dir string, stdout, stderr io.Writer) error {
return c.RunInDirTimeoutEnvPipeline(nil, timeout, dir, stdout, stderr)
type RunError interface {
error
Stderr() string
}
// RunInDirTimeoutFullPipeline executes the command in given directory with given timeout,
// it pipes stdout and stderr to given io.Writer, and stdin from the given io.Reader
func (c *Command) RunInDirTimeoutFullPipeline(timeout time.Duration, dir string, stdout, stderr io.Writer, stdin io.Reader) error {
return c.RunInDirTimeoutEnvFullPipeline(nil, timeout, dir, stdout, stderr, stdin)
type runError struct {
err error
stderr string
errMsg string
}
// RunInDirTimeout executes the command in given directory with given timeout,
// and returns stdout in []byte and error (combined with stderr).
func (c *Command) RunInDirTimeout(timeout time.Duration, dir string) ([]byte, error) {
return c.RunInDirTimeoutEnv(nil, timeout, dir)
}
// RunInDirTimeoutEnv executes the command in given directory with given timeout,
// and returns stdout in []byte and error (combined with stderr).
func (c *Command) RunInDirTimeoutEnv(env []string, timeout time.Duration, dir string) ([]byte, error) {
stdout := new(bytes.Buffer)
stderr := new(bytes.Buffer)
if err := c.RunInDirTimeoutEnvPipeline(env, timeout, dir, stdout, stderr); err != nil {
return nil, ConcatenateError(err, stderr.String())
func (r *runError) Error() string {
// the stderr must be in the returned error text, some code only checks `strings.Contains(err.Error(), "git error")`
if r.errMsg == "" {
r.errMsg = ConcatenateError(r.err, r.stderr).Error()
}
if stdout.Len() > 0 && log.IsTrace() {
tracelen := stdout.Len()
if tracelen > 1024 {
tracelen = 1024
}
log.Trace("Stdout:\n %s", stdout.Bytes()[:tracelen])
return r.errMsg
}
func (r *runError) Unwrap() error {
return r.err
}
func (r *runError) Stderr() string {
return r.stderr
}
func bytesToString(b []byte) string {
return *(*string)(unsafe.Pointer(&b)) // that's what Golang's strings.Builder.String() does (go/src/strings/builder.go)
}
// RunWithContextString run the command with context and returns stdout/stderr as string. and store stderr to returned error (err combined with stderr).
func (c *Command) RunWithContextString(rc *RunContext) (stdout, stderr string, runErr RunError) {
stdoutBytes, stderrBytes, err := c.RunWithContextBytes(rc)
stdout = bytesToString(stdoutBytes)
stderr = bytesToString(stderrBytes)
if err != nil {
return stdout, stderr, &runError{err: err, stderr: stderr}
}
return stdout.Bytes(), nil
// even if there is no err, there could still be some stderr output, so we just return stdout/stderr as they are
return stdout, stderr, nil
}
// RunInDirPipeline executes the command in given directory,
// it pipes stdout and stderr to given io.Writer.
func (c *Command) RunInDirPipeline(dir string, stdout, stderr io.Writer) error {
return c.RunInDirFullPipeline(dir, stdout, stderr, nil)
}
// RunInDirFullPipeline executes the command in given directory,
// it pipes stdout and stderr to given io.Writer.
func (c *Command) RunInDirFullPipeline(dir string, stdout, stderr io.Writer, stdin io.Reader) error {
return c.RunInDirTimeoutFullPipeline(-1, dir, stdout, stderr, stdin)
// RunWithContextBytes run the command with context and returns stdout/stderr as bytes. and store stderr to returned error (err combined with stderr).
func (c *Command) RunWithContextBytes(rc *RunContext) (stdout, stderr []byte, runErr RunError) {
if rc.Stdout != nil || rc.Stderr != nil {
// we must panic here, otherwise there would be bugs if developers set Stdin/Stderr by mistake, and it would be very difficult to debug
panic("stdout and stderr field must be nil when using RunWithContextBytes")
}
stdoutBuf := &bytes.Buffer{}
stderrBuf := &bytes.Buffer{}
rc.Stdout = stdoutBuf
rc.Stderr = stderrBuf
err := c.RunWithContext(rc)
stderr = stderrBuf.Bytes()
if err != nil {
return nil, stderr, &runError{err: err, stderr: string(stderr)}
}
// even if there is no err, there could still be some stderr output
return stdoutBuf.Bytes(), stderr, nil
}
// RunInDirBytes executes the command in given directory
// and returns stdout in []byte and error (combined with stderr).
func (c *Command) RunInDirBytes(dir string) ([]byte, error) {
return c.RunInDirTimeout(-1, dir)
stdout, _, err := c.RunWithContextBytes(&RunContext{Dir: dir})
return stdout, err
}
// RunInDir executes the command in given directory
@ -266,27 +256,15 @@ func (c *Command) RunInDir(dir string) (string, error) {
// RunInDirWithEnv executes the command in given directory
// and returns stdout in string and error (combined with stderr).
func (c *Command) RunInDirWithEnv(dir string, env []string) (string, error) {
stdout, err := c.RunInDirTimeoutEnv(env, -1, dir)
if err != nil {
return "", err
}
return string(stdout), nil
}
// RunTimeout executes the command in default working directory with given timeout,
// and returns stdout in string and error (combined with stderr).
func (c *Command) RunTimeout(timeout time.Duration) (string, error) {
stdout, err := c.RunInDirTimeout(timeout, "")
if err != nil {
return "", err
}
return string(stdout), nil
stdout, _, err := c.RunWithContextString(&RunContext{Env: env, Dir: dir})
return stdout, err
}
// Run executes the command in default working directory
// and returns stdout in string and error (combined with stderr).
func (c *Command) Run() (string, error) {
return c.RunTimeout(-1)
stdout, _, err := c.RunWithContextString(&RunContext{})
return stdout, err
}
// AllowLFSFiltersArgs return globalCommandArgs with lfs filter, it should only be used for tests

40
modules/git/command_race_test.go Normal file
View file

@ -0,0 +1,40 @@
// Copyright 2017 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
//go:build race
// +build race
package git
import (
"context"
"testing"
"time"
)
func TestRunWithContextNoTimeout(t *testing.T) {
maxLoops := 10
// 'git --version' does not block so it must be finished before the timeout triggered.
cmd := NewCommand(context.Background(), "--version")
for i := 0; i < maxLoops; i++ {
if err := cmd.RunWithContext(&RunContext{}); err != nil {
t.Fatal(err)
}
}
}
func TestRunWithContextTimeout(t *testing.T) {
maxLoops := 10
// 'git hash-object --stdin' blocks on stdin so we can have the timeout triggered.
cmd := NewCommand(context.Background(), "hash-object", "--stdin")
for i := 0; i < maxLoops; i++ {
if err := cmd.RunWithContext(&RunContext{Timeout: 1 * time.Millisecond}); err != nil {
if err != context.DeadlineExceeded {
t.Fatalf("Testing %d/%d: %v", i, maxLoops, err)
}
}
}
}

43
modules/git/command_test.go
View file

@ -1,40 +1,29 @@
// Copyright 2017 The Gitea Authors. All rights reserved.
// Copyright 2022 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
//go:build race
// +build race
package git
import (
"context"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func TestRunInDirTimeoutPipelineNoTimeout(t *testing.T) {
maxLoops := 1000
// 'git --version' does not block so it must be finished before the timeout triggered.
func TestRunWithContextStd(t *testing.T) {
cmd := NewCommand(context.Background(), "--version")
for i := 0; i < maxLoops; i++ {
if err := cmd.RunInDirTimeoutPipeline(-1, "", nil, nil); err != nil {
t.Fatal(err)
}
}
}
func TestRunInDirTimeoutPipelineAlwaysTimeout(t *testing.T) {
maxLoops := 1000
// 'git hash-object --stdin' blocks on stdin so we can have the timeout triggered.
cmd := NewCommand(context.Background(), "hash-object", "--stdin")
for i := 0; i < maxLoops; i++ {
if err := cmd.RunInDirTimeoutPipeline(1*time.Microsecond, "", nil, nil); err != nil {
if err != context.DeadlineExceeded {
t.Fatalf("Testing %d/%d: %v", i, maxLoops, err)
}
}
stdout, stderr, err := cmd.RunWithContextString(&RunContext{})
assert.NoError(t, err)
assert.Empty(t, stderr)
assert.Contains(t, stdout, "git version")
cmd = NewCommand(context.Background(), "--no-such-arg")
stdout, stderr, err = cmd.RunWithContextString(&RunContext{})
if assert.Error(t, err) {
assert.Equal(t, stderr, err.Stderr())
assert.Contains(t, err.Stderr(), "unknown option:")
assert.Contains(t, err.Error(), "exit status 129 - unknown option:")
assert.Empty(t, stdout)
}
}

11
modules/git/git.go
View file

@ -124,7 +124,9 @@ func VersionInfo() string {
func Init(ctx context.Context) error {
DefaultContext = ctx
defaultCommandExecutionTimeout = time.Duration(setting.Git.Timeout.Default) * time.Second
if setting.Git.Timeout.Default > 0 {
defaultCommandExecutionTimeout = time.Duration(setting.Git.Timeout.Default) * time.Second
}
if err := SetExecutablePath(setting.Git.Path); err != nil {
return err
@ -295,10 +297,5 @@ func checkAndRemoveConfig(key, value string) error {
// Fsck verifies the connectivity and validity of the objects in the database
func Fsck(ctx context.Context, repoPath string, timeout time.Duration, args ...string) error {
// Make sure timeout makes sense.
if timeout <= 0 {
timeout = -1
}
_, err := NewCommand(ctx, "fsck").AddArguments(args...).RunInDirTimeout(timeout, repoPath)
return err
return NewCommand(ctx, "fsck").AddArguments(args...).RunWithContext(&RunContext{Timeout: timeout, Dir: repoPath})
}

6
modules/process/manager.go
View file

@ -86,6 +86,10 @@ func (pm *Manager) AddContext(parent context.Context, description string) (ctx c
// Most processes will not need to use the cancel function but there will be cases whereby you want to cancel the process but not immediately remove it from the
// process table.
func (pm *Manager) AddContextTimeout(parent context.Context, timeout time.Duration, description string) (ctx context.Context, cancel context.CancelFunc, finshed FinishedFunc) {
if timeout <= 0 {
// it's meaningless to use timeout <= 0, and it must be a bug! so we must panic here to tell developers to make the timeout correct
panic("the timeout must be greater than zero, otherwise the context will be cancelled immediately")
}
ctx, cancel = context.WithTimeout(parent, timeout)
ctx, pid, finshed := pm.Add(ctx, description, cancel)
@ -239,7 +243,7 @@ func (pm *Manager) ExecDirEnv(ctx context.Context, timeout time.Duration, dir, d
// Returns its complete stdout and stderr
// outputs and an error, if any (including timeout)
func (pm *Manager) ExecDirEnvStdIn(ctx context.Context, timeout time.Duration, dir, desc string, env []string, stdIn io.Reader, cmdName string, args ...string) (string, string, error) {
if timeout == -1 {
if timeout <= 0 {
timeout = 60 * time.Second
}

2
routers/web/repo/http.go
View file

@ -542,7 +542,7 @@ func GetInfoRefs(ctx *context.Context) {
}
h.environ = append(os.Environ(), h.environ...)
refs, err := git.NewCommand(ctx, service, "--stateless-rpc", "--advertise-refs", ".").RunInDirTimeoutEnv(h.environ, -1, h.dir)
refs, _, err := git.NewCommand(ctx, service, "--stateless-rpc", "--advertise-refs", ".").RunWithContextBytes(&git.RunContext{Env: h.environ, Dir: h.dir})
if err != nil {
log.Error(fmt.Sprintf("%v - %s", err, string(refs)))
}

10
services/repository/check.go
View file

@ -77,15 +77,7 @@ func GitGcRepos(ctx context.Context, timeout time.Duration, args ...string) erro
SetDescription(fmt.Sprintf("Repository Garbage Collection: %s", repo.FullName()))
var stdout string
var err error
if timeout > 0 {
var stdoutBytes []byte
stdoutBytes, err = command.RunInDirTimeout(
timeout,
repo.RepoPath())
stdout = string(stdoutBytes)
} else {
stdout, err = command.RunInDir(repo.RepoPath())
}
stdout, _, err = command.RunWithContextString(&git.RunContext{Timeout: timeout, Dir: repo.RepoPath()})
if err != nil {
log.Error("Repository garbage collection failed for %v. Stdout: %s\nError: %v", repo, stdout, err)

4
services/repository/fork.go
View file

@ -108,10 +108,10 @@ func ForkRepository(ctx context.Context, doer, owner *user_model.User, opts Fork
needsRollback = true
repoPath := repo_model.RepoPath(owner.Name, repo.Name)
if stdout, err := git.NewCommand(txCtx,
if stdout, _, err := git.NewCommand(txCtx,
"clone", "--bare", oldRepoPath, repoPath).
SetDescription(fmt.Sprintf("ForkRepository(git clone): %s to %s", opts.BaseRepo.FullName(), repo.FullName())).
RunInDirTimeout(10*time.Minute, ""); err != nil {
RunWithContextBytes(&git.RunContext{Timeout: 10 * time.Minute}); err != nil {
log.Error("Fork Repository (git clone) Failed for %v (from %v):\nStdout: %s\nError: %v", repo, opts.BaseRepo, stdout, err)
return fmt.Errorf("git clone: %v", err)
}