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manager.go
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348 lines (309 loc) · 8.29 KB
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package extension
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"runtime"
"strings"
"github.com/MakeNowJust/heredoc"
"github.com/cli/cli/v2/internal/config"
"github.com/cli/cli/v2/pkg/extensions"
"github.com/cli/cli/v2/pkg/findsh"
"github.com/cli/safeexec"
)
type Manager struct {
dataDir func() string
lookPath func(string) (string, error)
findSh func() (string, error)
newCommand func(string, ...string) *exec.Cmd
}
func NewManager() *Manager {
return &Manager{
dataDir: config.DataDir,
lookPath: safeexec.LookPath,
findSh: findsh.Find,
newCommand: exec.Command,
}
}
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)
for _, e := range exts {
if e.Name() == extName {
exe = e.Path()
break
}
}
if exe == "" {
return false, nil
}
var externalCmd *exec.Cmd
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...)
} else {
externalCmd = m.newCommand(exe, 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)
return exts
}
func (m *Manager) list(includeMetadata bool) ([]extensions.Extension, error) {
dir := m.installDir()
entries, err := ioutil.ReadDir(dir)
if err != nil {
return nil, err
}
var results []extensions.Extension
for _, f := range entries {
if !strings.HasPrefix(f.Name(), "gh-") {
continue
}
var remoteUrl string
updateAvailable := false
isLocal := false
exePath := filepath.Join(dir, f.Name(), f.Name())
if f.IsDir() {
if includeMetadata {
remoteUrl = m.getRemoteUrl(f.Name())
updateAvailable = m.checkUpdateAvailable(f.Name())
}
} else {
isLocal = true
if !isSymlink(f.Mode()) {
// if this is a regular file, its contents is the local directory of the extension
p, err := readPathFromFile(filepath.Join(dir, f.Name()))
if err != nil {
return nil, err
}
exePath = filepath.Join(p, f.Name())
}
}
results = append(results, &Extension{
path: exePath,
url: remoteUrl,
isLocal: isLocal,
updateAvailable: updateAvailable,
})
}
return results, nil
}
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) checkUpdateAvailable(extension string) bool {
gitExe, err := m.lookPath("git")
if err != nil {
return false
}
dir := m.installDir()
gitDir := "--git-dir=" + filepath.Join(dir, extension, ".git")
cmd := m.newCommand(gitExe, gitDir, "ls-remote", "origin", "HEAD")
lsRemote, err := cmd.Output()
if err != nil {
return false
}
remoteSha := bytes.SplitN(lsRemote, []byte("\t"), 2)[0]
cmd = m.newCommand(gitExe, gitDir, "rev-parse", "HEAD")
localSha, err := cmd.Output()
if err != nil {
return false
}
localSha = bytes.TrimSpace(localSha)
return !bytes.Equal(remoteSha, localSha)
}
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)
}
func (m *Manager) Install(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")
func (m *Manager) Upgrade(name string, force bool, stdout, stderr io.Writer) error {
exe, err := m.lookPath("git")
if err != nil {
return err
}
exts := m.List(false)
if len(exts) == 0 {
return errors.New("no extensions installed")
}
someUpgraded := false
for _, f := range exts {
if name == "" {
fmt.Fprintf(stdout, "[%s]: ", f.Name())
} else if f.Name() != name {
continue
}
if f.IsLocal() {
if name == "" {
fmt.Fprintf(stdout, "%s\n", localExtensionUpgradeError)
} else {
err = localExtensionUpgradeError
}
continue
}
var cmds []*exec.Cmd
dir := filepath.Dir(f.Path())
if force {
fetchCmd := m.newCommand(exe, "-C", dir, "--git-dir="+filepath.Join(dir, ".git"), "fetch", "origin", "HEAD")
resetCmd := m.newCommand(exe, "-C", dir, "--git-dir="+filepath.Join(dir, ".git"), "reset", "--hard", "origin/HEAD")
cmds = []*exec.Cmd{fetchCmd, resetCmd}
} else {
pullCmd := m.newCommand(exe, "-C", dir, "--git-dir="+filepath.Join(dir, ".git"), "pull", "--ff-only")
cmds = []*exec.Cmd{pullCmd}
}
if e := runCmds(cmds, stdout, stderr); e != nil {
err = e
}
someUpgraded = true
}
if err == nil && !someUpgraded {
err = fmt.Errorf("no extension matched %q", name)
}
return err
}
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")
}
func (m *Manager) Create(name string) error {
exe, err := m.lookPath("git")
if err != nil {
return err
}
err = os.Mkdir(name, 0755)
if err != nil {
return err
}
initCmd := m.newCommand(exe, "init", "--quiet", name)
err = initCmd.Run()
if err != nil {
return err
}
fileTmpl := heredoc.Docf(`
#!/usr/bin/env bash
set -e
echo "Hello %[1]s!"
# Snippets to help get started:
# Determine if an executable is in the PATH
# if ! type -p ruby >/dev/null; then
# echo "Ruby not found on the system" >&2
# exit 1
# fi
# Pass arguments through to another command
# gh issue list "$@" -R cli/cli
# Using the gh api command to retrieve and format information
# QUERY='
# query($endCursor: String) {
# viewer {
# repositories(first: 100, after: $endCursor) {
# nodes {
# nameWithOwner
# stargazerCount
# }
# }
# }
# }
# '
# TEMPLATE='
# {{- range $repo := .data.viewer.repositories.nodes -}}
# {{- printf "name: %[2]s - stargazers: %[3]s\n" $repo.nameWithOwner $repo.stargazerCount -}}
# {{- end -}}
# '
# exec gh api graphql -f query="${QUERY}" --paginate --template="${TEMPLATE}"
`, name, "%s", "%v")
filePath := filepath.Join(name, name)
err = ioutil.WriteFile(filePath, []byte(fileTmpl), 0755)
if err != nil {
return err
}
wd, err := os.Getwd()
if err != nil {
return err
}
dir := filepath.Join(wd, name)
addCmd := m.newCommand(exe, "-C", dir, "--git-dir="+filepath.Join(dir, ".git"), "add", name, "--chmod=+x")
err = addCmd.Run()
return err
}
func runCmds(cmds []*exec.Cmd, stdout, stderr io.Writer) error {
for _, cmd := range cmds {
cmd.Stdout = stdout
cmd.Stderr = stderr
if err := cmd.Run(); err != nil {
return err
}
}
return nil
}
func isSymlink(m os.FileMode) bool {
return m&os.ModeSymlink != 0
}
// 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
}