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gitea/modules/git/command.go
wxiaoguang 4734d43e14
Support repo code search without setting up an indexer ()
By using git's ability, end users (especially small instance users) do
not need to enable the indexer, they could also benefit from the code
searching feature.

Fix 


![image](https://github.com/go-gitea/gitea/assets/2114189/11b7e458-88a4-480d-b4d7-72ee59406dd1)


![image](https://github.com/go-gitea/gitea/assets/2114189/0fe777d5-c95c-4288-a818-0427680805b6)

---------

Co-authored-by: silverwind <me@silverwind.io>
2024-03-24 17:05:00 +01:00

461 lines
15 KiB
Go

// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2016 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package git
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"os"
"os/exec"
"runtime"
"strings"
"time"
"code.gitea.io/gitea/modules/git/internal" //nolint:depguard // only this file can use the internal type CmdArg, other files and packages should use AddXxx functions
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/process"
"code.gitea.io/gitea/modules/util"
)
// TrustedCmdArgs returns the trusted arguments for git command.
// It's mainly for passing user-provided and trusted arguments to git command
// In most cases, it shouldn't be used. Use AddXxx function instead
type TrustedCmdArgs []internal.CmdArg
var (
// globalCommandArgs global command args for external package setting
globalCommandArgs TrustedCmdArgs
// defaultCommandExecutionTimeout default command execution timeout duration
defaultCommandExecutionTimeout = 360 * time.Second
)
// DefaultLocale is the default LC_ALL to run git commands in.
const DefaultLocale = "C"
// Command represents a command with its subcommands or arguments.
type Command struct {
prog string
args []string
parentContext context.Context
desc string
globalArgsLength int
brokenArgs []string
}
func (c *Command) String() string {
return c.toString(false)
}
func (c *Command) toString(sanitizing bool) string {
// WARNING: this function is for debugging purposes only. It's much better than old code (which only joins args with space),
// It's impossible to make a simple and 100% correct implementation of argument quoting for different platforms.
debugQuote := func(s string) string {
if strings.ContainsAny(s, " `'\"\t\r\n") {
return fmt.Sprintf("%q", s)
}
return s
}
a := make([]string, 0, len(c.args)+1)
a = append(a, debugQuote(c.prog))
for _, arg := range c.args {
if sanitizing && (strings.Contains(arg, "://") && strings.Contains(arg, "@")) {
a = append(a, debugQuote(util.SanitizeCredentialURLs(arg)))
} else {
a = append(a, debugQuote(arg))
}
}
return strings.Join(a, " ")
}
// NewCommand creates and returns a new Git Command based on given command and arguments.
// Each argument should be safe to be trusted. User-provided arguments should be passed to AddDynamicArguments instead.
func NewCommand(ctx context.Context, args ...internal.CmdArg) *Command {
// Make an explicit copy of globalCommandArgs, otherwise append might overwrite it
cargs := make([]string, 0, len(globalCommandArgs)+len(args))
for _, arg := range globalCommandArgs {
cargs = append(cargs, string(arg))
}
for _, arg := range args {
cargs = append(cargs, string(arg))
}
return &Command{
prog: GitExecutable,
args: cargs,
parentContext: ctx,
globalArgsLength: len(globalCommandArgs),
}
}
// 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
// Each argument should be safe to be trusted. User-provided arguments should be passed to AddDynamicArguments instead.
func NewCommandContextNoGlobals(ctx context.Context, args ...internal.CmdArg) *Command {
cargs := make([]string, 0, len(args))
for _, arg := range args {
cargs = append(cargs, string(arg))
}
return &Command{
prog: GitExecutable,
args: cargs,
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
}
// isSafeArgumentValue checks if the argument is safe to be used as a value (not an option)
func isSafeArgumentValue(s string) bool {
return s == "" || s[0] != '-'
}
// isValidArgumentOption checks if the argument is a valid option (starting with '-').
// It doesn't check whether the option is supported or not
func isValidArgumentOption(s string) bool {
return s != "" && s[0] == '-'
}
// AddArguments adds new git arguments (option/value) to the command. It only accepts string literals, or trusted CmdArg.
// Type CmdArg is in the internal package, so it can not be used outside of this package directly,
// it makes sure that user-provided arguments won't cause RCE risks.
// User-provided arguments should be passed by other AddXxx functions
func (c *Command) AddArguments(args ...internal.CmdArg) *Command {
for _, arg := range args {
c.args = append(c.args, string(arg))
}
return c
}
// AddOptionValues adds a new option with a list of non-option values
// For example: AddOptionValues("--opt", val) means 2 arguments: {"--opt", val}.
// The values are treated as dynamic argument values. It equals to: AddArguments("--opt") then AddDynamicArguments(val).
func (c *Command) AddOptionValues(opt internal.CmdArg, args ...string) *Command {
if !isValidArgumentOption(string(opt)) {
c.brokenArgs = append(c.brokenArgs, string(opt))
return c
}
c.args = append(c.args, string(opt))
c.AddDynamicArguments(args...)
return c
}
// AddOptionFormat adds a new option with a format string and arguments
// For example: AddOptionFormat("--opt=%s %s", val1, val2) means 1 argument: {"--opt=val1 val2"}.
func (c *Command) AddOptionFormat(opt string, args ...any) *Command {
if !isValidArgumentOption(opt) {
c.brokenArgs = append(c.brokenArgs, opt)
return c
}
// a quick check to make sure the format string matches the number of arguments, to find low-level mistakes ASAP
if strings.Count(strings.ReplaceAll(opt, "%%", ""), "%") != len(args) {
c.brokenArgs = append(c.brokenArgs, opt)
return c
}
s := fmt.Sprintf(opt, args...)
c.args = append(c.args, s)
return c
}
// AddDynamicArguments adds new dynamic argument values to the command.
// The arguments may come from user input and can not be trusted, so no leading '-' is allowed to avoid passing options.
// TODO: in the future, this function can be renamed to AddArgumentValues
func (c *Command) AddDynamicArguments(args ...string) *Command {
for _, arg := range args {
if !isSafeArgumentValue(arg) {
c.brokenArgs = append(c.brokenArgs, arg)
}
}
if len(c.brokenArgs) != 0 {
return c
}
c.args = append(c.args, args...)
return c
}
// AddDashesAndList adds the "--" and then add the list as arguments, it's usually for adding file list
// At the moment, this function can be only called once, maybe in future it can be refactored to support multiple calls (if necessary)
func (c *Command) AddDashesAndList(list ...string) *Command {
c.args = append(c.args, "--")
// Some old code also checks `arg != ""`, IMO it's not necessary.
// If the check is needed, the list should be prepared before the call to this function
c.args = append(c.args, list...)
return c
}
// ToTrustedCmdArgs converts a list of strings (trusted as argument) to TrustedCmdArgs
// In most cases, it shouldn't be used. Use NewCommand().AddXxx() function instead
func ToTrustedCmdArgs(args []string) TrustedCmdArgs {
ret := make(TrustedCmdArgs, len(args))
for i, arg := range args {
ret[i] = internal.CmdArg(arg)
}
return ret
}
// RunOpts represents parameters to run the command. If UseContextTimeout is specified, then Timeout is ignored.
type RunOpts struct {
Env []string
Timeout time.Duration
UseContextTimeout bool
// Dir is the working dir for the git command, however:
// FIXME: this could be incorrect in many cases, for example:
// * /some/path/.git
// * /some/path/.git/gitea-data/data/repositories/user/repo.git
// If "user/repo.git" is invalid/broken, then running git command in it will use "/some/path/.git", and produce unexpected results
// The correct approach is to use `--git-dir" global argument
Dir string
Stdout, Stderr io.Writer
// Stdin is used for passing input to the command
// The caller must make sure the Stdin writer is closed properly to finish the Run function.
// Otherwise, the Run function may hang for long time or forever, especially when the Git's context deadline is not the same as the caller's.
// Some common mistakes:
// * `defer stdinWriter.Close()` then call `cmd.Run()`: the Run() would never return if the command is killed by timeout
// * `go { case <- parentContext.Done(): stdinWriter.Close() }` with `cmd.Run(DefaultTimeout)`: the command would have been killed by timeout but the Run doesn't return until stdinWriter.Close()
// * `go { if stdoutReader.Read() err != nil: stdinWriter.Close() }` with `cmd.Run()`: the stdoutReader may never return error if the command is killed by timeout
// In the future, ideally the git module itself should have full control of the stdin, to avoid such problems and make it easier to refactor to a better architecture.
Stdin io.Reader
PipelineFunc func(context.Context, context.CancelFunc) error
}
func commonBaseEnvs() []string {
// at the moment, do not set "GIT_CONFIG_NOSYSTEM", users may have put some configs like "receive.certNonceSeed" in it
envs := []string{
"HOME=" + HomeDir(), // make Gitea use internal git config only, to prevent conflicts with user's git config
"GIT_NO_REPLACE_OBJECTS=1", // ignore replace references (https://git-scm.com/docs/git-replace)
}
// some environment variables should be passed to git command
passThroughEnvKeys := []string{
"GNUPGHOME", // git may call gnupg to do commit signing
}
for _, key := range passThroughEnvKeys {
if val, ok := os.LookupEnv(key); ok {
envs = append(envs, key+"="+val)
}
}
return envs
}
// CommonGitCmdEnvs returns the common environment variables for a "git" command.
func CommonGitCmdEnvs() []string {
return append(commonBaseEnvs(), []string{
"LC_ALL=" + DefaultLocale,
"GIT_TERMINAL_PROMPT=0", // avoid prompting for credentials interactively, supported since git v2.3
}...)
}
// CommonCmdServEnvs is like CommonGitCmdEnvs, but it only returns minimal required environment variables for the "gitea serv" command
func CommonCmdServEnvs() []string {
return commonBaseEnvs()
}
var ErrBrokenCommand = errors.New("git command is broken")
// Run runs the command with the RunOpts
func (c *Command) Run(opts *RunOpts) error {
if len(c.brokenArgs) != 0 {
log.Error("git command is broken: %s, broken args: %s", c.String(), strings.Join(c.brokenArgs, " "))
return ErrBrokenCommand
}
if opts == nil {
opts = &RunOpts{}
}
// We must not change the provided options
timeout := opts.Timeout
if timeout <= 0 {
timeout = defaultCommandExecutionTimeout
}
if len(opts.Dir) == 0 {
log.Debug("git.Command.Run: %s", c)
} else {
log.Debug("git.Command.RunDir(%s): %s", opts.Dir, c)
}
desc := c.desc
if desc == "" {
if opts.Dir == "" {
desc = fmt.Sprintf("git: %s", c.toString(true))
} else {
desc = fmt.Sprintf("git(dir:%s): %s", opts.Dir, c.toString(true))
}
}
var ctx context.Context
var cancel context.CancelFunc
var finished context.CancelFunc
if opts.UseContextTimeout {
ctx, cancel, finished = process.GetManager().AddContext(c.parentContext, desc)
} else {
ctx, cancel, finished = process.GetManager().AddContextTimeout(c.parentContext, timeout, desc)
}
defer finished()
startTime := time.Now()
cmd := exec.CommandContext(ctx, c.prog, c.args...)
if opts.Env == nil {
cmd.Env = os.Environ()
} else {
cmd.Env = opts.Env
}
process.SetSysProcAttribute(cmd)
cmd.Env = append(cmd.Env, CommonGitCmdEnvs()...)
cmd.Dir = opts.Dir
cmd.Stdout = opts.Stdout
cmd.Stderr = opts.Stderr
cmd.Stdin = opts.Stdin
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
}
}
err := cmd.Wait()
elapsed := time.Since(startTime)
if elapsed > time.Second {
log.Debug("slow git.Command.Run: %s (%s)", c, elapsed)
}
// We need to check if the context is canceled by the program on Windows.
// This is because Windows does not have signal checking when terminating the process.
// It always returns exit code 1, unlike Linux, which has many exit codes for signals.
if runtime.GOOS == "windows" &&
err != nil &&
err.Error() == "" &&
cmd.ProcessState.ExitCode() == 1 &&
ctx.Err() == context.Canceled {
return ctx.Err()
}
if err != nil && ctx.Err() != context.DeadlineExceeded {
return err
}
return ctx.Err()
}
type RunStdError interface {
error
Unwrap() error
Stderr() string
}
type runStdError struct {
err error
stderr string
errMsg string
}
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
}
func (r *runStdError) Unwrap() error {
return r.err
}
func (r *runStdError) Stderr() string {
return r.stderr
}
func IsErrorExitCode(err error, code int) bool {
var exitError *exec.ExitError
if errors.As(err, &exitError) {
return exitError.ExitCode() == code
}
return false
}
// 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 = util.UnsafeBytesToString(stdoutBytes)
stderr = util.UnsafeBytesToString(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{}
// We must not change the provided options as it could break future calls - therefore make a copy.
newOpts := &RunOpts{
Env: opts.Env,
Timeout: opts.Timeout,
UseContextTimeout: opts.UseContextTimeout,
Dir: opts.Dir,
Stdout: stdoutBuf,
Stderr: stderrBuf,
Stdin: opts.Stdin,
PipelineFunc: opts.PipelineFunc,
}
err := c.Run(newOpts)
stderr = stderrBuf.Bytes()
if err != nil {
return nil, stderr, &runStdError{err: err, stderr: util.UnsafeBytesToString(stderr)}
}
// even if there is no err, there could still be some stderr output
return stdoutBuf.Bytes(), stderr, nil
}
// AllowLFSFiltersArgs return globalCommandArgs with lfs filter, it should only be used for tests
func AllowLFSFiltersArgs() TrustedCmdArgs {
// Now here we should explicitly allow lfs filters to run
filteredLFSGlobalArgs := make(TrustedCmdArgs, len(globalCommandArgs))
j := 0
for _, arg := range globalCommandArgs {
if strings.Contains(string(arg), "lfs") {
j--
} else {
filteredLFSGlobalArgs[j] = arg
j++
}
}
return filteredLFSGlobalArgs[:j]
}