// Copyright 2015 The Gogs Authors. All rights reserved.// 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. package git import (	"context"	"fmt"	"os/exec"	"runtime"	"strings"	"time" 	"code.gitea.io/gitea/modules/process"	"code.gitea.io/gitea/modules/setting" 	"github.com/hashicorp/go-version") var (	// Prefix the log prefix	Prefix = "[git-module] "	// GitVersionRequired is the minimum Git version required	GitVersionRequired = "1.7.2" 	// GitExecutable is the command name of git	// Could be updated to an absolute path while initialization	GitExecutable = "git" 	// DefaultContext is the default context to run git commands in	// will be overwritten by Init with HammerContext	DefaultContext = context.Background() 	gitVersion *version.Version 	// will be checked on Init	goVersionLessThan115 = true 	// SupportProcReceive version >= 2.29.0	SupportProcReceive bool) // LocalVersion returns current Git version from shell.func LocalVersion() (*version.Version, error) {	if err := LoadGitVersion(); err != nil {		return nil, err	}	return gitVersion, nil} // LoadGitVersion returns current Git version from shell.func LoadGitVersion() error {	// doesn't need RWMutex because its exec by Init()	if gitVersion != nil {		return nil	} 	stdout, err := NewCommand("version").Run()	if err != nil {		return err	} 	fields := strings.Fields(stdout)	if len(fields) < 3 {		return fmt.Errorf("not enough output: %s", stdout)	} 	var versionString string 	// Handle special case on Windows.	i := strings.Index(fields[2], "windows")	if i >= 1 {		versionString = fields[2][:i-1]	} else {		versionString = fields[2]	} 	gitVersion, err = version.NewVersion(versionString)	return err} // SetExecutablePath changes the path of git executable and checks the file permission and version.func SetExecutablePath(path string) error {	// If path is empty, we use the default value of GitExecutable "git" to search for the location of git.	if path != "" {		GitExecutable = path	}	absPath, err := exec.LookPath(GitExecutable)	if err != nil {		return fmt.Errorf("Git not found: %v", err)	}	GitExecutable = absPath 	err = LoadGitVersion()	if err != nil {		return fmt.Errorf("Git version missing: %v", err)	} 	versionRequired, err := version.NewVersion(GitVersionRequired)	if err != nil {		return err	} 	if gitVersion.LessThan(versionRequired) {		return fmt.Errorf("Git version not supported. Requires version > %v", GitVersionRequired)	} 	return nil} // VersionInfo returns git version informationfunc VersionInfo() string {	var format = "Git Version: %s"	var args = []interface{}{gitVersion.Original()}	// Since git wire protocol has been released from git v2.18	if setting.Git.EnableAutoGitWireProtocol && CheckGitVersionAtLeast("2.18") == nil {		format += ", Wire Protocol %s Enabled"		args = append(args, "Version 2") // for focus color	} 	return fmt.Sprintf(format, args...)} // Init initializes git modulefunc Init(ctx context.Context) error {	DefaultContext = ctx 	defaultCommandExecutionTimeout = time.Duration(setting.Git.Timeout.Default) * time.Second 	if err := SetExecutablePath(setting.Git.Path); err != nil {		return err	} 	// force cleanup args	GlobalCommandArgs = []string{} 	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")	} 	// Save current git version on init to gitVersion otherwise it would require an RWMutex	if err := LoadGitVersion(); err != nil {		return err	} 	// Save if the go version used to compile gitea is greater or equal 1.15	runtimeVersion, err := version.NewVersion(strings.TrimPrefix(runtime.Version(), "go"))	if err != nil {		return err	}	version115, _ := version.NewVersion("1.15")	goVersionLessThan115 = runtimeVersion.LessThan(version115) 	// Git requires setting user.name and user.email in order to commit changes - if they're not set just add some defaults	for configKey, defaultValue := range map[string]string{"user.name": "Gitea", "user.email": "gitea@fake.local"} {		if err := checkAndSetConfig(configKey, defaultValue, false); err != nil {			return err		}	} 	// Set git some configurations - these must be set to these values for gitea to work correctly	if err := checkAndSetConfig("core.quotePath", "false", true); err != nil {		return err	} 	if CheckGitVersionAtLeast("2.10") == nil {		if err := checkAndSetConfig("receive.advertisePushOptions", "true", true); err != nil {			return err		}	} 	if CheckGitVersionAtLeast("2.18") == nil {		if err := checkAndSetConfig("core.commitGraph", "true", true); err != nil {			return err		}		if err := checkAndSetConfig("gc.writeCommitGraph", "true", true); err != nil {			return err		}	} 	if CheckGitVersionAtLeast("2.29") == nil {		// set support for AGit flow		if err := checkAndAddConfig("receive.procReceiveRefs", "refs/for"); err != nil {			return err		}		SupportProcReceive = true	} else {		if err := checkAndRemoveConfig("receive.procReceiveRefs", "refs/for"); err != nil {			return err		}		SupportProcReceive = false	} 	if runtime.GOOS == "windows" {		if err := checkAndSetConfig("core.longpaths", "true", true); err != nil {			return err		}	}	if setting.Git.DisableCoreProtectNTFS {		if err := checkAndSetConfig("core.protectntfs", "false", true); err != nil {			return err		}		GlobalCommandArgs = append(GlobalCommandArgs, "-c", "core.protectntfs=false")	}	return nil} // CheckGitVersionAtLeast check git version is at least the constraint versionfunc CheckGitVersionAtLeast(atLeast string) error {	if err := LoadGitVersion(); err != nil {		return err	}	atLeastVersion, err := version.NewVersion(atLeast)	if err != nil {		return err	}	if gitVersion.Compare(atLeastVersion) < 0 {		return fmt.Errorf("installed git binary version %s is not at least %s", gitVersion.Original(), atLeast)	}	return nil} func checkAndSetConfig(key, defaultValue string, forceToDefault bool) error {	stdout, stderr, err := process.GetManager().Exec("git.Init(get setting)", GitExecutable, "config", "--get", key)	if err != nil {		perr, ok := err.(*process.Error)		if !ok {			return fmt.Errorf("Failed to get git %s(%v) errType %T: %s", key, err, err, stderr)		}		eerr, ok := perr.Err.(*exec.ExitError)		if !ok || eerr.ExitCode() != 1 {			return fmt.Errorf("Failed to get git %s(%v) errType %T: %s", key, err, err, stderr)		}	} 	currValue := strings.TrimSpace(stdout) 	if currValue == defaultValue || (!forceToDefault && len(currValue) > 0) {		return nil	} 	if _, stderr, err = process.GetManager().Exec(fmt.Sprintf("git.Init(set %s)", key), "git", "config", "--global", key, defaultValue); err != nil {		return fmt.Errorf("Failed to set git %s(%s): %s", key, err, stderr)	} 	return nil} func checkAndAddConfig(key, value string) error {	_, stderr, err := process.GetManager().Exec("git.Init(get setting)", GitExecutable, "config", "--get", key, value)	if err != nil {		perr, ok := err.(*process.Error)		if !ok {			return fmt.Errorf("Failed to get git %s(%v) errType %T: %s", key, err, err, stderr)		}		eerr, ok := perr.Err.(*exec.ExitError)		if !ok || eerr.ExitCode() != 1 {			return fmt.Errorf("Failed to get git %s(%v) errType %T: %s", key, err, err, stderr)		}		if eerr.ExitCode() == 1 {			if _, stderr, err = process.GetManager().Exec(fmt.Sprintf("git.Init(set %s)", key), "git", "config", "--global", "--add", key, value); err != nil {				return fmt.Errorf("Failed to set git %s(%s): %s", key, err, stderr)			}			return nil		}	} 	return nil} func checkAndRemoveConfig(key, value string) error {	_, stderr, err := process.GetManager().Exec("git.Init(get setting)", GitExecutable, "config", "--get", key, value)	if err != nil {		perr, ok := err.(*process.Error)		if !ok {			return fmt.Errorf("Failed to get git %s(%v) errType %T: %s", key, err, err, stderr)		}		eerr, ok := perr.Err.(*exec.ExitError)		if !ok || eerr.ExitCode() != 1 {			return fmt.Errorf("Failed to get git %s(%v) errType %T: %s", key, err, err, stderr)		}		if eerr.ExitCode() == 1 {			return nil		}	} 	if _, stderr, err = process.GetManager().Exec(fmt.Sprintf("git.Init(set %s)", key), "git", "config", "--global", "--unset-all", key, value); err != nil {		return fmt.Errorf("Failed to set git %s(%s): %s", key, err, stderr)	} 	return nil} // Fsck verifies the connectivity and validity of the objects in the databasefunc Fsck(ctx context.Context, repoPath string, timeout time.Duration, args ...string) error {	// Make sure timeout makes sense.	if timeout <= 0 {		timeout = -1	}	_, err := NewCommandContext(ctx, "fsck").AddArguments(args...).RunInDirTimeout(timeout, repoPath)	return err}