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package git
import (
"bytes"
"errors"
"fmt"
"io"
"net/url"
"os"
"os/exec"
"path"
"regexp"
"runtime"
"strings"
"github.com/cli/cli/v2/internal/run"
"github.com/cli/safeexec"
)
// ErrNotOnAnyBranch indicates that the user is in detached HEAD state
var ErrNotOnAnyBranch = errors.New("git: not on any branch")
// Ref represents a git commit reference
type Ref struct {
Hash string
Name string
}
// TrackingRef represents a ref for a remote tracking branch
type TrackingRef struct {
RemoteName string
BranchName string
}
func (r TrackingRef) String() string {
return "refs/remotes/" + r.RemoteName + "/" + r.BranchName
}
// ShowRefs resolves fully-qualified refs to commit hashes
func ShowRefs(ref ...string) ([]Ref, error) {
args := append([]string{"show-ref", "--verify", "--"}, ref...)
showRef, err := GitCommand(args...)
if err != nil {
return nil, err
}
output, err := run.PrepareCmd(showRef).Output()
var refs []Ref
for _, line := range outputLines(output) {
parts := strings.SplitN(line, " ", 2)
if len(parts) < 2 {
continue
}
refs = append(refs, Ref{
Hash: parts[0],
Name: parts[1],
})
}
return refs, err
}
// CurrentBranch reads the checked-out branch for the git repository
func CurrentBranch() (string, error) {
refCmd, err := GitCommand("symbolic-ref", "--quiet", "HEAD")
if err != nil {
return "", err
}
stderr := bytes.Buffer{}
refCmd.Stderr = &stderr
output, err := run.PrepareCmd(refCmd).Output()
if err == nil {
// Found the branch name
return getBranchShortName(output), nil
}
if stderr.Len() == 0 {
// Detached head
return "", ErrNotOnAnyBranch
}
return "", fmt.Errorf("%sgit: %s", stderr.String(), err)
}
func listRemotesForPath(path string) ([]string, error) {
remoteCmd, err := GitCommand("-C", path, "remote", "-v")
if err != nil {
return nil, err
}
output, err := run.PrepareCmd(remoteCmd).Output()
return outputLines(output), err
}
func listRemotes() ([]string, error) {
remoteCmd, err := GitCommand("remote", "-v")
if err != nil {
return nil, err
}
output, err := run.PrepareCmd(remoteCmd).Output()
return outputLines(output), err
}
func Config(name string) (string, error) {
configCmd, err := GitCommand("config", name)
if err != nil {
return "", err
}
output, err := run.PrepareCmd(configCmd).Output()
if err != nil {
return "", fmt.Errorf("unknown config key: %s", name)
}
return firstLine(output), nil
}
type NotInstalled struct {
message string
error
}
func (e *NotInstalled) Error() string {
return e.message
}
func GitCommand(args ...string) (*exec.Cmd, error) {
gitExe, err := safeexec.LookPath("git")
if err != nil {
if errors.Is(err, exec.ErrNotFound) {
programName := "git"
if runtime.GOOS == "windows" {
programName = "Git for Windows"
}
return nil, &NotInstalled{
message: fmt.Sprintf("unable to find git executable in PATH; please install %s before retrying", programName),
error: err,
}
}
return nil, err
}
return exec.Command(gitExe, args...), nil
}
func UncommittedChangeCount() (int, error) {
statusCmd, err := GitCommand("status", "--porcelain")
if err != nil {
return 0, err
}
output, err := run.PrepareCmd(statusCmd).Output()
if err != nil {
return 0, err
}
lines := strings.Split(string(output), "\n")
count := 0
for _, l := range lines {
if l != "" {
count++
}
}
return count, nil
}
type Commit struct {
Sha string
Title string
}
func Commits(baseRef, headRef string) ([]*Commit, error) {
logCmd, err := GitCommand(
"-c", "log.ShowSignature=false",
"log", "--pretty=format:%H,%s",
"--cherry", fmt.Sprintf("%s...%s", baseRef, headRef))
if err != nil {
return nil, err
}
output, err := run.PrepareCmd(logCmd).Output()
if err != nil {
return []*Commit{}, err
}
commits := []*Commit{}
sha := 0
title := 1
for _, line := range outputLines(output) {
split := strings.SplitN(line, ",", 2)
if len(split) != 2 {
continue
}
commits = append(commits, &Commit{
Sha: split[sha],
Title: split[title],
})
}
if len(commits) == 0 {
return commits, fmt.Errorf("could not find any commits between %s and %s", baseRef, headRef)
}
return commits, nil
}
func lookupCommit(sha, format string) ([]byte, error) {
logCmd, err := GitCommand("-c", "log.ShowSignature=false", "show", "-s", "--pretty=format:"+format, sha)
if err != nil {
return nil, err
}
return run.PrepareCmd(logCmd).Output()
}
func LastCommit() (*Commit, error) {
output, err := lookupCommit("HEAD", "%H,%s")
if err != nil {
return nil, err
}
idx := bytes.IndexByte(output, ',')
return &Commit{
Sha: string(output[0:idx]),
Title: strings.TrimSpace(string(output[idx+1:])),
}, nil
}
func CommitBody(sha string) (string, error) {
output, err := lookupCommit(sha, "%b")
return string(output), err
}
// Push publishes a git ref to a remote and sets up upstream configuration
func Push(remote string, ref string, cmdOut, cmdErr io.Writer) error {
pushCmd, err := GitCommand("push", "--set-upstream", remote, ref)
if err != nil {
return err
}
pushCmd.Stdout = cmdOut
pushCmd.Stderr = cmdErr
return run.PrepareCmd(pushCmd).Run()
}
type BranchConfig struct {
RemoteName string
RemoteURL *url.URL
MergeRef string
}
// ReadBranchConfig parses the `branch.BRANCH.(remote|merge)` part of git config
func ReadBranchConfig(branch string) (cfg BranchConfig) {
prefix := regexp.QuoteMeta(fmt.Sprintf("branch.%s.", branch))
configCmd, err := GitCommand("config", "--get-regexp", fmt.Sprintf("^%s(remote|merge)$", prefix))
if err != nil {
return
}
output, err := run.PrepareCmd(configCmd).Output()
if err != nil {
return
}
for _, line := range outputLines(output) {
parts := strings.SplitN(line, " ", 2)
if len(parts) < 2 {
continue
}
keys := strings.Split(parts[0], ".")
switch keys[len(keys)-1] {
case "remote":
if strings.Contains(parts[1], ":") {
u, err := ParseURL(parts[1])
if err != nil {
continue
}
cfg.RemoteURL = u
} else if !isFilesystemPath(parts[1]) {
cfg.RemoteName = parts[1]
}
case "merge":
cfg.MergeRef = parts[1]
}
}
return
}
func DeleteLocalBranch(branch string) error {
branchCmd, err := GitCommand("branch", "-D", branch)
if err != nil {
return err
}
return run.PrepareCmd(branchCmd).Run()
}
func HasLocalBranch(branch string) bool {
configCmd, err := GitCommand("rev-parse", "--verify", "refs/heads/"+branch)
if err != nil {
return false
}
_, err = run.PrepareCmd(configCmd).Output()
return err == nil
}
func CheckoutBranch(branch string) error {
configCmd, err := GitCommand("checkout", branch)
if err != nil {
return err
}
return run.PrepareCmd(configCmd).Run()
}
// pull changes from remote branch without version history
func Pull(remote, branch string) error {
pullCmd, err := GitCommand("pull", "--ff-only", remote, branch)
if err != nil {
return err
}
pullCmd.Stdout = os.Stdout
pullCmd.Stderr = os.Stderr
pullCmd.Stdin = os.Stdin
return run.PrepareCmd(pullCmd).Run()
}
func parseCloneArgs(extraArgs []string) (args []string, target string) {
args = extraArgs
if len(args) > 0 {
if !strings.HasPrefix(args[0], "-") {
target, args = args[0], args[1:]
}
}
return
}
func RunClone(cloneURL string, args []string) (target string, err error) {
cloneArgs, target := parseCloneArgs(args)
cloneArgs = append(cloneArgs, cloneURL)
// If the args contain an explicit target, pass it to clone
// otherwise, parse the URL to determine where git cloned it to so we can return it
if target != "" {
cloneArgs = append(cloneArgs, target)
} else {
target = path.Base(strings.TrimSuffix(cloneURL, ".git"))
}
cloneArgs = append([]string{"clone"}, cloneArgs...)
cloneCmd, err := GitCommand(cloneArgs...)
if err != nil {
return "", err
}
cloneCmd.Stdin = os.Stdin
cloneCmd.Stdout = os.Stdout
cloneCmd.Stderr = os.Stderr
err = run.PrepareCmd(cloneCmd).Run()
return
}
func AddUpstreamRemote(upstreamURL, cloneDir string, branches []string) error {
args := []string{"-C", cloneDir, "remote", "add"}
for _, branch := range branches {
args = append(args, "-t", branch)
}
args = append(args, "-f", "upstream", upstreamURL)
cloneCmd, err := GitCommand(args...)
if err != nil {
return err
}
cloneCmd.Stdout = os.Stdout
cloneCmd.Stderr = os.Stderr
return run.PrepareCmd(cloneCmd).Run()
}
func isFilesystemPath(p string) bool {
return p == "." || strings.HasPrefix(p, "./") || strings.HasPrefix(p, "/")
}
// ToplevelDir returns the top-level directory path of the current repository
func ToplevelDir() (string, error) {
showCmd, err := GitCommand("rev-parse", "--show-toplevel")
if err != nil {
return "", err
}
output, err := run.PrepareCmd(showCmd).Output()
return firstLine(output), err
}
// ToplevelDirFromPath returns the top-level given path of the current repository
func GetDirFromPath(p string) (string, error) {
showCmd, err := GitCommand("-C", p, "rev-parse", "--git-dir")
if err != nil {
return "", err
}
output, err := run.PrepareCmd(showCmd).Output()
return firstLine(output), err
}
func PathFromRepoRoot() string {
showCmd, err := GitCommand("rev-parse", "--show-prefix")
if err != nil {
return ""
}
output, err := run.PrepareCmd(showCmd).Output()
if err != nil {
return ""
}
if path := firstLine(output); path != "" {
return path[:len(path)-1]
}
return ""
}
func outputLines(output []byte) []string {
lines := strings.TrimSuffix(string(output), "\n")
return strings.Split(lines, "\n")
}
func firstLine(output []byte) string {
if i := bytes.IndexAny(output, "\n"); i >= 0 {
return string(output)[0:i]
}
return string(output)
}
func getBranchShortName(output []byte) string {
branch := firstLine(output)
return strings.TrimPrefix(branch, "refs/heads/")
}