gitea/modules/git/command.go

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// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2016 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package git
import (
"bytes"
"context"
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"fmt"
"io"
"os"
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"os/exec"
"strings"
"time"
"unsafe"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/process"
"code.gitea.io/gitea/modules/util"
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)
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var (
// globalCommandArgs global command args for external package setting
globalCommandArgs []string
// defaultCommandExecutionTimeout default command execution timeout duration
defaultCommandExecutionTimeout = 360 * time.Second
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)
// DefaultLocale is the default LC_ALL to run git commands in.
const DefaultLocale = "C"
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// Command represents a command with its subcommands or arguments.
type Command struct {
name string
args []string
parentContext context.Context
desc string
globalArgsLength int
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}
func (c *Command) String() string {
if len(c.args) == 0 {
return c.name
}
return fmt.Sprintf("%s %s", c.name, strings.Join(c.args, " "))
}
// NewCommand creates and returns a new Git Command based on given command and arguments.
func NewCommand(ctx context.Context, args ...string) *Command {
// Make an explicit copy of globalCommandArgs, otherwise append might overwrite it
cargs := make([]string, len(globalCommandArgs))
copy(cargs, globalCommandArgs)
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return &Command{
name: GitExecutable,
args: append(cargs, args...),
parentContext: ctx,
globalArgsLength: len(globalCommandArgs),
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}
}
// NewCommandNoGlobals creates and returns a new Git Command based on given command and arguments only with the specify args and don't care global command args
func NewCommandNoGlobals(args ...string) *Command {
return NewCommandContextNoGlobals(DefaultContext, args...)
}
// NewCommandContextNoGlobals creates and returns a new Git Command based on given command and arguments only with the specify args and don't care global command args
func NewCommandContextNoGlobals(ctx context.Context, args ...string) *Command {
return &Command{
name: GitExecutable,
args: args,
parentContext: ctx,
}
}
// SetParentContext sets the parent context for this command
func (c *Command) SetParentContext(ctx context.Context) *Command {
c.parentContext = ctx
return c
}
// SetDescription sets the description for this command which be returned on
// c.String()
func (c *Command) SetDescription(desc string) *Command {
c.desc = desc
return c
}
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// AddArguments adds new argument(s) to the command.
func (c *Command) AddArguments(args ...string) *Command {
c.args = append(c.args, args...)
return c
}
// RunOpts represents parameters to run the command
type RunOpts struct {
Env []string
Timeout time.Duration
Dir string
Stdout, Stderr io.Writer
Stdin io.Reader
PipelineFunc func(context.Context, context.CancelFunc) error
}
// Run runs the command with the RunOpts
func (c *Command) Run(opts *RunOpts) error {
if opts == nil {
opts = &RunOpts{}
}
if opts.Timeout <= 0 {
opts.Timeout = defaultCommandExecutionTimeout
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}
if len(opts.Dir) == 0 {
log.Debug("%s", c)
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} else {
log.Debug("%s: %v", opts.Dir, c)
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}
desc := c.desc
if desc == "" {
args := c.args[c.globalArgsLength:]
var argSensitiveURLIndexes []int
for i, arg := range c.args {
if strings.Contains(arg, "://") && strings.Contains(arg, "@") {
argSensitiveURLIndexes = append(argSensitiveURLIndexes, i)
}
}
if len(argSensitiveURLIndexes) > 0 {
args = make([]string, len(c.args))
copy(args, c.args)
for _, urlArgIndex := range argSensitiveURLIndexes {
args[urlArgIndex] = util.SanitizeCredentialURLs(args[urlArgIndex])
}
}
desc = fmt.Sprintf("%s %s [repo_path: %s]", c.name, strings.Join(args, " "), opts.Dir)
}
ctx, cancel, finished := process.GetManager().AddContextTimeout(c.parentContext, opts.Timeout, desc)
defer finished()
cmd := exec.CommandContext(ctx, c.name, c.args...)
if opts.Env == nil {
cmd.Env = os.Environ()
} else {
cmd.Env = opts.Env
}
Disable new signal-based asynchronous goroutine preemption from GO 1.14 in git env (#11237) As seen in trouble shooting #11032 the new feature of Go 1.14 is causing several second delays in startup in certain situations. Debugging shows it spending several seconds handling SIGURG commands during init: ``` 6922:04:51.984234 trace init() ./modules/queue/unique_queue_wrapped.go remote: ) = 69 <0.000012> remote: [pid 15984] 22:04:51 write(1, "\ttime taken: 236.761\302\265s\n\n", 25 time taken: 236.761µs remote: remote: ) = 25 <0.000011> remote: [pid 15984] 22:04:51 --- SIGURG {si_signo=SIGURG, si_code=SI_TKILL, si_pid=15984, si_uid=0} --- remote: [pid 15984] 22:04:52 --- SIGURG {si_signo=SIGURG, si_code=SI_TKILL, si_pid=15984, si_uid=0} --- remote: [pid 15984] 22:04:52 --- SIGURG {si_signo=SIGURG, si_code=SI_TKILL, si_pid=15984, si_uid=0} --- ``` This causes up to 20 seconds added to a push in some cases as it happens for each call of the gitea hook command. This is likely the cause of #10661 as well and would start to effect users once we release 1.12 which would be the first release compiled with Go 1.14. I suspect this is just a slight issue with the upstream implementatation as there have been a few very similar bugs fixed and reported: https://github.com/golang/go/issues/37741 https://github.com/golang/go/issues/37942 We should revisit this in the future and see if a newer version of Go has solved it, but for now disable this option in the environment that gitea hook runs in to avoid it.
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cmd.Env = append(
cmd.Env,
fmt.Sprintf("LC_ALL=%s", DefaultLocale),
// avoid prompting for credentials interactively, supported since git v2.3
"GIT_TERMINAL_PROMPT=0",
// ignore replace references (https://git-scm.com/docs/git-replace)
"GIT_NO_REPLACE_OBJECTS=1",
)
cmd.Dir = opts.Dir
cmd.Stdout = opts.Stdout
cmd.Stderr = opts.Stderr
cmd.Stdin = opts.Stdin
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if err := cmd.Start(); err != nil {
return err
}
if opts.PipelineFunc != nil {
err := opts.PipelineFunc(ctx, cancel)
if err != nil {
cancel()
_ = cmd.Wait()
return err
}
}
if err := cmd.Wait(); err != nil && ctx.Err() != context.DeadlineExceeded {
return err
}
return ctx.Err()
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}
type RunStdError interface {
error
Stderr() string
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}
type runStdError struct {
err error
stderr string
errMsg string
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}
func (r *runStdError) 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()
}
return r.errMsg
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}
func (r *runStdError) Unwrap() error {
return r.err
}
func (r *runStdError) Stderr() string {
return r.stderr
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}
func bytesToString(b []byte) string {
return *(*string)(unsafe.Pointer(&b)) // that's what Golang's strings.Builder.String() does (go/src/strings/builder.go)
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}
// RunStdString runs the command with options and returns stdout/stderr as string. and store stderr to returned error (err combined with stderr).
func (c *Command) RunStdString(opts *RunOpts) (stdout, stderr string, runErr RunStdError) {
stdoutBytes, stderrBytes, err := c.RunStdBytes(opts)
stdout = bytesToString(stdoutBytes)
stderr = bytesToString(stderrBytes)
if err != nil {
return stdout, stderr, &runStdError{err: err, stderr: stderr}
}
// 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
}
// RunStdBytes runs the command with options and returns stdout/stderr as bytes. and store stderr to returned error (err combined with stderr).
func (c *Command) RunStdBytes(opts *RunOpts) (stdout, stderr []byte, runErr RunStdError) {
if opts == nil {
opts = &RunOpts{}
}
if opts.Stdout != nil || opts.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 RunStdBytes")
}
stdoutBuf := &bytes.Buffer{}
stderrBuf := &bytes.Buffer{}
opts.Stdout = stdoutBuf
opts.Stderr = stderrBuf
err := c.Run(opts)
stderr = stderrBuf.Bytes()
if err != nil {
return nil, stderr, &runStdError{err: err, stderr: bytesToString(stderr)}
}
// even if there is no err, there could still be some stderr output
return stdoutBuf.Bytes(), stderr, nil
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}
// AllowLFSFiltersArgs return globalCommandArgs with lfs filter, it should only be used for tests
func AllowLFSFiltersArgs() []string {
// Now here we should explicitly allow lfs filters to run
filteredLFSGlobalArgs := make([]string, len(globalCommandArgs))
j := 0
for _, arg := range globalCommandArgs {
if strings.Contains(arg, "lfs") {
j--
} else {
filteredLFSGlobalArgs[j] = arg
j++
}
}
return filteredLFSGlobalArgs[:j]
}