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package extension
import (
"bytes"
_ "embed"
"errors"
"fmt"
"io"
"io/fs"
"io/ioutil"
"net/http"
"os"
"os/exec"
"path"
"path/filepath"
"runtime"
"strings"
"sync"
"github.com/cli/cli/v2/api"
"github.com/cli/cli/v2/git"
"github.com/cli/cli/v2/internal/config"
"github.com/cli/cli/v2/internal/ghrepo"
"github.com/cli/cli/v2/pkg/extensions"
"github.com/cli/cli/v2/pkg/findsh"
"github.com/cli/cli/v2/pkg/iostreams"
"github.com/cli/safeexec"
"gopkg.in/yaml.v3"
)
type Manager struct {
dataDir func() string
lookPath func(string) (string, error)
findSh func() (string, error)
newCommand func(string, ...string) *exec.Cmd
platform func() (string, string)
client *http.Client
config config.Config
io *iostreams.IOStreams
}
func NewManager(io *iostreams.IOStreams) *Manager {
return &Manager{
dataDir: config.DataDir,
lookPath: safeexec.LookPath,
findSh: findsh.Find,
newCommand: exec.Command,
platform: func() (string, string) {
ext := ""
if runtime.GOOS == "windows" {
ext = ".exe"
}
return fmt.Sprintf("%s-%s", runtime.GOOS, runtime.GOARCH), ext
},
io: io,
}
}
func (m *Manager) SetConfig(cfg config.Config) {
m.config = cfg
}
func (m *Manager) SetClient(client *http.Client) {
m.client = client
}
func (m *Manager) Dispatch(args []string, stdin io.Reader, stdout, stderr io.Writer) (bool, error) {
if len(args) == 0 {
return false, errors.New("too few arguments in list")
}
var exe string
extName := args[0]
forwardArgs := args[1:]
exts, _ := m.list(false)
var ext Extension
for _, e := range exts {
if e.Name() == extName {
ext = e
exe = ext.Path()
break
}
}
if exe == "" {
return false, nil
}
var externalCmd *exec.Cmd
if ext.IsBinary() || runtime.GOOS != "windows" {
externalCmd = m.newCommand(exe, forwardArgs...)
} else if runtime.GOOS == "windows" {
// Dispatch all extension calls through the `sh` interpreter to support executable files with a
// shebang line on Windows.
shExe, err := m.findSh()
if err != nil {
if errors.Is(err, exec.ErrNotFound) {
return true, errors.New("the `sh.exe` interpreter is required. Please install Git for Windows and try again")
}
return true, err
}
forwardArgs = append([]string{"-c", `command "$@"`, "--", exe}, forwardArgs...)
externalCmd = m.newCommand(shExe, forwardArgs...)
}
externalCmd.Stdin = stdin
externalCmd.Stdout = stdout
externalCmd.Stderr = stderr
return true, externalCmd.Run()
}
func (m *Manager) List(includeMetadata bool) []extensions.Extension {
exts, _ := m.list(includeMetadata)
r := make([]extensions.Extension, len(exts))
for i, v := range exts {
val := v
r[i] = &val
}
return r
}
func (m *Manager) list(includeMetadata bool) ([]Extension, error) {
dir := m.installDir()
entries, err := ioutil.ReadDir(dir)
if err != nil {
return nil, err
}
var results []Extension
for _, f := range entries {
if !strings.HasPrefix(f.Name(), "gh-") {
continue
}
var ext Extension
var err error
if f.IsDir() {
ext, err = m.parseExtensionDir(f)
if err != nil {
return nil, err
}
results = append(results, ext)
} else {
ext, err = m.parseExtensionFile(f)
if err != nil {
return nil, err
}
results = append(results, ext)
}
}
if includeMetadata {
m.populateLatestVersions(results)
}
return results, nil
}
func (m *Manager) parseExtensionFile(fi fs.FileInfo) (Extension, error) {
ext := Extension{isLocal: true}
id := m.installDir()
exePath := filepath.Join(id, fi.Name(), fi.Name())
if !isSymlink(fi.Mode()) {
// if this is a regular file, its contents is the local directory of the extension
p, err := readPathFromFile(filepath.Join(id, fi.Name()))
if err != nil {
return ext, err
}
exePath = filepath.Join(p, fi.Name())
}
ext.path = exePath
return ext, nil
}
func (m *Manager) parseExtensionDir(fi fs.FileInfo) (Extension, error) {
id := m.installDir()
if _, err := os.Stat(filepath.Join(id, fi.Name(), manifestName)); err == nil {
return m.parseBinaryExtensionDir(fi)
}
return m.parseGitExtensionDir(fi)
}
func (m *Manager) parseBinaryExtensionDir(fi fs.FileInfo) (Extension, error) {
id := m.installDir()
exePath := filepath.Join(id, fi.Name(), fi.Name())
ext := Extension{path: exePath, kind: BinaryKind}
manifestPath := filepath.Join(id, fi.Name(), manifestName)
manifest, err := os.ReadFile(manifestPath)
if err != nil {
return ext, fmt.Errorf("could not open %s for reading: %w", manifestPath, err)
}
var bm binManifest
err = yaml.Unmarshal(manifest, &bm)
if err != nil {
return ext, fmt.Errorf("could not parse %s: %w", manifestPath, err)
}
repo := ghrepo.NewWithHost(bm.Owner, bm.Name, bm.Host)
remoteURL := ghrepo.GenerateRepoURL(repo, "")
ext.url = remoteURL
ext.currentVersion = bm.Tag
return ext, nil
}
func (m *Manager) parseGitExtensionDir(fi fs.FileInfo) (Extension, error) {
id := m.installDir()
exePath := filepath.Join(id, fi.Name(), fi.Name())
remoteUrl := m.getRemoteUrl(fi.Name())
currentVersion := m.getCurrentVersion(fi.Name())
return Extension{
path: exePath,
url: remoteUrl,
isLocal: false,
currentVersion: currentVersion,
kind: GitKind,
}, nil
}
// getCurrentVersion determines the current version for non-local git extensions.
func (m *Manager) getCurrentVersion(extension string) string {
gitExe, err := m.lookPath("git")
if err != nil {
return ""
}
dir := m.installDir()
gitDir := "--git-dir=" + filepath.Join(dir, extension, ".git")
cmd := m.newCommand(gitExe, gitDir, "rev-parse", "HEAD")
localSha, err := cmd.Output()
if err != nil {
return ""
}
return string(bytes.TrimSpace(localSha))
}
// getRemoteUrl determines the remote URL for non-local git extensions.
func (m *Manager) getRemoteUrl(extension string) string {
gitExe, err := m.lookPath("git")
if err != nil {
return ""
}
dir := m.installDir()
gitDir := "--git-dir=" + filepath.Join(dir, extension, ".git")
cmd := m.newCommand(gitExe, gitDir, "config", "remote.origin.url")
url, err := cmd.Output()
if err != nil {
return ""
}
return strings.TrimSpace(string(url))
}
func (m *Manager) populateLatestVersions(exts []Extension) {
size := len(exts)
type result struct {
index int
version string
}
ch := make(chan result, size)
var wg sync.WaitGroup
wg.Add(size)
for idx, ext := range exts {
go func(i int, e Extension) {
defer wg.Done()
version, _ := m.getLatestVersion(e)
ch <- result{index: i, version: version}
}(idx, ext)
}
wg.Wait()
close(ch)
for r := range ch {
ext := &exts[r.index]
ext.latestVersion = r.version
}
}
func (m *Manager) getLatestVersion(ext Extension) (string, error) {
if ext.isLocal {
return "", localExtensionUpgradeError
}
if ext.IsBinary() {
repo, err := ghrepo.FromFullName(ext.url)
if err != nil {
return "", err
}
r, err := fetchLatestRelease(m.client, repo)
if err != nil {
return "", err
}
return r.Tag, nil
} else {
gitExe, err := m.lookPath("git")
if err != nil {
return "", err
}
extDir := filepath.Dir(ext.path)
gitDir := "--git-dir=" + filepath.Join(extDir, ".git")
cmd := m.newCommand(gitExe, gitDir, "ls-remote", "origin", "HEAD")
lsRemote, err := cmd.Output()
if err != nil {
return "", err
}
remoteSha := bytes.SplitN(lsRemote, []byte("\t"), 2)[0]
return string(remoteSha), nil
}
}
func (m *Manager) InstallLocal(dir string) error {
name := filepath.Base(dir)
targetLink := filepath.Join(m.installDir(), name)
if err := os.MkdirAll(filepath.Dir(targetLink), 0755); err != nil {
return err
}
return makeSymlink(dir, targetLink)
}
type binManifest struct {
Owner string
Name string
Host string
Tag string
// TODO I may end up not using this; just thinking ahead to local installs
Path string
}
func (m *Manager) Install(repo ghrepo.Interface) error {
isBin, err := isBinExtension(m.client, repo)
if err != nil {
return fmt.Errorf("could not check for binary extension: %w", err)
}
if isBin {
return m.installBin(repo)
}
hs, err := hasScript(m.client, repo)
if err != nil {
return err
}
if !hs {
return errors.New("extension is not installable: missing executable")
}
protocol, _ := m.config.GetOrDefault(repo.RepoHost(), "git_protocol")
return m.installGit(ghrepo.FormatRemoteURL(repo, protocol), m.io.Out, m.io.ErrOut)
}
func (m *Manager) installBin(repo ghrepo.Interface) error {
var r *release
r, err := fetchLatestRelease(m.client, repo)
if err != nil {
return err
}
platform, ext := m.platform()
var asset *releaseAsset
for _, a := range r.Assets {
if strings.HasSuffix(a.Name, platform+ext) {
asset = &a
break
}
}
if asset == nil {
return fmt.Errorf(
"%[1]s unsupported for %[2]s. Open an issue: `gh issue create -R %[3]s/%[1]s -t'Support %[2]s'`",
repo.RepoName(), platform, repo.RepoOwner())
}
name := repo.RepoName()
targetDir := filepath.Join(m.installDir(), name)
// TODO clean this up if function errs?
err = os.MkdirAll(targetDir, 0755)
if err != nil {
return fmt.Errorf("failed to create installation directory: %w", err)
}
binPath := filepath.Join(targetDir, name)
binPath += ext
err = downloadAsset(m.client, *asset, binPath)
if err != nil {
return fmt.Errorf("failed to download asset %s: %w", asset.Name, err)
}
manifest := binManifest{
Name: name,
Owner: repo.RepoOwner(),
Host: repo.RepoHost(),
Path: binPath,
Tag: r.Tag,
}
bs, err := yaml.Marshal(manifest)
if err != nil {
return fmt.Errorf("failed to serialize manifest: %w", err)
}
manifestPath := filepath.Join(targetDir, manifestName)
f, err := os.OpenFile(manifestPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return fmt.Errorf("failed to open manifest for writing: %w", err)
}
defer f.Close()
_, err = f.Write(bs)
if err != nil {
return fmt.Errorf("failed write manifest file: %w", err)
}
return nil
}
func (m *Manager) installGit(cloneURL string, stdout, stderr io.Writer) error {
exe, err := m.lookPath("git")
if err != nil {
return err
}
name := strings.TrimSuffix(path.Base(cloneURL), ".git")
targetDir := filepath.Join(m.installDir(), name)
externalCmd := m.newCommand(exe, "clone", cloneURL, targetDir)
externalCmd.Stdout = stdout
externalCmd.Stderr = stderr
return externalCmd.Run()
}
var localExtensionUpgradeError = errors.New("local extensions can not be upgraded")
var upToDateError = errors.New("already up to date")
var noExtensionsInstalledError = errors.New("no extensions installed")
func (m *Manager) Upgrade(name string, force bool) error {
// Fetch metadata during list only when upgrading all extensions.
// This is a performance improvement so that we don't make a
// bunch of unecessary network requests when trying to upgrade a single extension.
fetchMetadata := name == ""
exts, _ := m.list(fetchMetadata)
if len(exts) == 0 {
return noExtensionsInstalledError
}
if name == "" {
return m.upgradeExtensions(exts, force)
}
for _, f := range exts {
if f.Name() != name {
continue
}
var err error
// For single extensions manually retrieve latest version since we forgo
// doing it during list.
f.latestVersion, err = m.getLatestVersion(f)
if err != nil {
return err
}
return m.upgradeExtension(f, force)
}
return fmt.Errorf("no extension matched %q", name)
}
func (m *Manager) upgradeExtensions(exts []Extension, force bool) error {
var failed bool
for _, f := range exts {
fmt.Fprintf(m.io.Out, "[%s]: ", f.Name())
err := m.upgradeExtension(f, force)
if err != nil {
if !errors.Is(err, localExtensionUpgradeError) &&
!errors.Is(err, upToDateError) {
failed = true
}
fmt.Fprintf(m.io.Out, "%s\n", err)
continue
}
fmt.Fprintf(m.io.Out, "upgrade complete\n")
}
if failed {
return errors.New("some extensions failed to upgrade")
}
return nil
}
func (m *Manager) upgradeExtension(ext Extension, force bool) error {
if ext.isLocal {
return localExtensionUpgradeError
}
if !ext.UpdateAvailable() {
return upToDateError
}
var err error
if ext.IsBinary() {
err = m.upgradeBinExtension(ext)
} else {
// Check if git extension has changed to a binary extension
var isBin bool
repo, repoErr := repoFromPath(filepath.Join(ext.Path(), ".."))
if repoErr == nil {
isBin, _ = isBinExtension(m.client, repo)
}
if isBin {
err = m.Remove(ext.Name())
if err != nil {
return fmt.Errorf("failed to migrate to new precompiled extension format: %w", err)
}
return m.installBin(repo)
}
err = m.upgradeGitExtension(ext, force)
}
return err
}
func (m *Manager) upgradeGitExtension(ext Extension, force bool) error {
exe, err := m.lookPath("git")
if err != nil {
return err
}
dir := filepath.Dir(ext.path)
if force {
if err := m.newCommand(exe, "-C", dir, "fetch", "origin", "HEAD").Run(); err != nil {
return err
}
return m.newCommand(exe, "-C", dir, "reset", "--hard", "origin/HEAD").Run()
}
return m.newCommand(exe, "-C", dir, "pull", "--ff-only").Run()
}
func (m *Manager) upgradeBinExtension(ext Extension) error {
repo, err := ghrepo.FromFullName(ext.url)
if err != nil {
return fmt.Errorf("failed to parse URL %s: %w", ext.url, err)
}
return m.installBin(repo)
}
func (m *Manager) Remove(name string) error {
targetDir := filepath.Join(m.installDir(), "gh-"+name)
if _, err := os.Lstat(targetDir); os.IsNotExist(err) {
return fmt.Errorf("no extension found: %q", targetDir)
}
return os.RemoveAll(targetDir)
}
func (m *Manager) installDir() string {
return filepath.Join(m.dataDir(), "extensions")
}
//go:embed ext_tmpls/goBinMain.go.txt
var mainGoTmpl string
//go:embed ext_tmpls/goBinWorkflow.yml
var goBinWorkflow []byte
//go:embed ext_tmpls/otherBinWorkflow.yml
var otherBinWorkflow []byte
//go:embed ext_tmpls/script.sh
var scriptTmpl string
//go:embed ext_tmpls/buildScript.sh
var buildScript []byte
func (m *Manager) Create(name string, tmplType extensions.ExtTemplateType) error {
exe, err := m.lookPath("git")
if err != nil {
return err
}
if err := m.newCommand(exe, "init", "--quiet", name).Run(); err != nil {
return err
}
if tmplType == extensions.GoBinTemplateType {
return m.goBinScaffolding(exe, name)
} else if tmplType == extensions.OtherBinTemplateType {
return m.otherBinScaffolding(exe, name)
}
script := fmt.Sprintf(scriptTmpl, name)
if err := writeFile(filepath.Join(name, name), []byte(script), 0755); err != nil {
return err
}
return m.newCommand(exe, "-C", name, "add", name, "--chmod=+x").Run()
}
func (m *Manager) otherBinScaffolding(gitExe, name string) error {
if err := writeFile(filepath.Join(name, ".github", "workflows", "release.yml"), otherBinWorkflow, 0644); err != nil {
return err
}
buildScriptPath := filepath.Join("script", "build.sh")
if err := writeFile(filepath.Join(name, buildScriptPath), buildScript, 0755); err != nil {
return err
}
if err := m.newCommand(gitExe, "-C", name, "add", buildScriptPath, "--chmod=+x").Run(); err != nil {
return err
}
return m.newCommand(gitExe, "-C", name, "add", ".").Run()
}
func (m *Manager) goBinScaffolding(gitExe, name string) error {
goExe, err := m.lookPath("go")
if err != nil {
return fmt.Errorf("go is required for creating Go extensions: %w", err)
}
if err := writeFile(filepath.Join(name, ".github", "workflows", "release.yml"), goBinWorkflow, 0644); err != nil {
return err
}
mainGo := fmt.Sprintf(mainGoTmpl, name)
if err := writeFile(filepath.Join(name, "main.go"), []byte(mainGo), 0644); err != nil {
return err
}
host, err := m.config.DefaultHost()
if err != nil {
return err
}
currentUser, err := api.CurrentLoginName(api.NewClientFromHTTP(m.client), host)
if err != nil {
return err
}
goCmds := [][]string{
{"mod", "init", fmt.Sprintf("%s/%s/%s", host, currentUser, name)},
{"mod", "tidy"},
{"build"},
}
ignore := fmt.Sprintf("/%[1]s\n/%[1]s.exe\n", name)
if err := writeFile(filepath.Join(name, ".gitignore"), []byte(ignore), 0644); err != nil {
return err
}
for _, args := range goCmds {
goCmd := m.newCommand(goExe, args...)
goCmd.Dir = name
if err := goCmd.Run(); err != nil {
return fmt.Errorf("failed to set up go module: %w", err)
}
}
return m.newCommand(gitExe, "-C", name, "add", ".").Run()
}
func isSymlink(m os.FileMode) bool {
return m&os.ModeSymlink != 0
}
func writeFile(p string, contents []byte, mode os.FileMode) error {
if dir := filepath.Dir(p); dir != "." {
if err := os.MkdirAll(dir, 0755); err != nil {
return err
}
}
return os.WriteFile(p, contents, mode)
}
// reads the product of makeSymlink on Windows
func readPathFromFile(path string) (string, error) {
f, err := os.Open(path)
if err != nil {
return "", err
}
defer f.Close()
b := make([]byte, 1024)
n, err := f.Read(b)
return strings.TrimSpace(string(b[:n])), err
}
func isBinExtension(client *http.Client, repo ghrepo.Interface) (isBin bool, err error) {
var r *release
r, err = fetchLatestRelease(client, repo)
if err != nil {
httpErr, ok := err.(api.HTTPError)
if ok && httpErr.StatusCode == 404 {
err = nil
return
}
return
}
for _, a := range r.Assets {
dists := possibleDists()
for _, d := range dists {
suffix := d
if strings.HasPrefix(d, "windows") {
suffix += ".exe"
}
if strings.HasSuffix(a.Name, suffix) {
isBin = true
break
}
}
}
return
}
func repoFromPath(path string) (ghrepo.Interface, error) {
remotes, err := git.RemotesForPath(path)
if err != nil {
return nil, err
}
if len(remotes) == 0 {
return nil, fmt.Errorf("no remotes configured for %s", path)
}
var remote *git.Remote
for _, r := range remotes {
if r.Name == "origin" {
remote = r
break
}
}
if remote == nil {
remote = remotes[0]
}
return ghrepo.FromURL(remote.FetchURL)
}
func possibleDists() []string {
return []string{
"aix-ppc64",
"android-386",
"android-amd64",
"android-arm",
"android-arm64",
"darwin-amd64",
"darwin-arm64",
"dragonfly-amd64",
"freebsd-386",
"freebsd-amd64",
"freebsd-arm",
"freebsd-arm64",
"illumos-amd64",
"ios-amd64",
"ios-arm64",
"js-wasm",
"linux-386",
"linux-amd64",
"linux-arm",
"linux-arm64",
"linux-mips",
"linux-mips64",
"linux-mips64le",
"linux-mipsle",
"linux-ppc64",
"linux-ppc64le",
"linux-riscv64",
"linux-s390x",
"netbsd-386",
"netbsd-amd64",
"netbsd-arm",
"netbsd-arm64",
"openbsd-386",
"openbsd-amd64",
"openbsd-arm",
"openbsd-arm64",
"openbsd-mips64",
"plan9-386",
"plan9-amd64",
"plan9-arm",
"solaris-amd64",
"windows-386",
"windows-amd64",
"windows-arm",
}
}