// package goupdate provides tooling to auto-update binary releases
|
// from GitHub based on the user's current version and operating system.
|
package goupdate
|
|
import (
|
"fmt"
|
"io"
|
"io/ioutil"
|
"net/http"
|
"os"
|
"path/filepath"
|
"runtime"
|
"strconv"
|
"strings"
|
"time"
|
|
"github.com/apex/log"
|
"github.com/c4milo/unpackit"
|
"github.com/pkg/errors"
|
)
|
|
// Proxy is used to proxy a reader, for example
|
// using https://github.com/cheggaaa/pb to provide
|
// progress updates.
|
type Proxy func(int, io.ReadCloser) io.ReadCloser
|
|
// NopProxy does nothing.
|
var NopProxy = func(size int, r io.ReadCloser) io.ReadCloser {
|
return r
|
}
|
|
// Manager is the update manager.
|
type Manager struct {
|
Store // Store for releases such as Github or a custom private store.
|
Command string // Command is the executable's name.
|
}
|
|
// Release represents a project release.
|
type Release struct {
|
Version string // Version is the release version.
|
Notes string // Notes is the markdown release notes.
|
URL string // URL is the notes url.
|
PublishedAt time.Time // PublishedAt is the publish time.
|
Assets []*Asset // Assets is the release assets.
|
}
|
|
// Asset represents a project release asset.
|
type Asset struct {
|
Name string // Name of the asset.
|
Size int // Size of the asset.
|
URL string // URL of the asset.
|
Downloads int // Downloads count.
|
}
|
|
// InstallTo binary to the given dir.
|
func (m *Manager) InstallTo(path, dir string) error {
|
log.Debugf("unpacking %q", path)
|
|
f, err := os.Open(path)
|
if err != nil {
|
return errors.Wrap(err, "opening tarball")
|
}
|
|
err = unpackit.Unpack(f, "")
|
if err != nil {
|
f.Close()
|
return errors.Wrap(err, "unpacking tarball")
|
}
|
|
if err := f.Close(); err != nil {
|
return errors.Wrap(err, "closing tarball")
|
}
|
|
bin := filepath.Join(path, m.Command)
|
|
if err := os.Chmod(bin, 0755); err != nil {
|
return errors.Wrap(err, "chmod")
|
}
|
|
dst := filepath.Join(dir, m.Command)
|
tmp := dst + ".tmp"
|
|
log.Debugf("copy %q to %q", bin, tmp)
|
if err := copyFile(tmp, bin); err != nil {
|
return errors.Wrap(err, "copying")
|
}
|
|
if runtime.GOOS == "windows" {
|
old := dst + ".old"
|
log.Debugf("windows workaround renaming %q to %q", dst, old)
|
if err := os.Rename(dst, old); err != nil {
|
return errors.Wrap(err, "windows renaming")
|
}
|
}
|
|
log.Debugf("renaming %q to %q", tmp, dst)
|
if err := os.Rename(tmp, dst); err != nil {
|
return errors.Wrap(err, "renaming")
|
}
|
|
return nil
|
}
|
|
// Install binary to replace the current version.
|
func (m *Manager) Install(path string) error {
|
bin, err := os.Executable()
|
if err != nil {
|
return errors.Wrapf(err, "looking up path of %q", m.Command)
|
}
|
|
dir := filepath.Dir(bin)
|
return m.InstallTo(path, dir)
|
}
|
|
// FindTarball returns a tarball matching os and arch, or nil.
|
func (r *Release) FindTarball(os, arch string) *Asset {
|
s := fmt.Sprintf("%s_%s", os, arch)
|
for _, a := range r.Assets {
|
ext := filepath.Ext(a.Name)
|
if strings.Contains(a.Name, s) && ext == ".gz" {
|
return a
|
}
|
}
|
|
return nil
|
}
|
|
// FindZip returns a zipfile matching os and arch, or nil.
|
func (r *Release) FindZip(os, arch string) *Asset {
|
s := fmt.Sprintf("%s_%s", os, arch)
|
for _, a := range r.Assets {
|
ext := filepath.Ext(a.Name)
|
if strings.Contains(a.Name, s) && ext == ".zip" {
|
return a
|
}
|
}
|
|
return nil
|
}
|
|
// Download the asset to a tmp directory and return its path.
|
func (a *Asset) Download() (string, error) {
|
return a.DownloadProxy(NopProxy)
|
}
|
|
// DownloadProxy the asset to a tmp directory and return its path.
|
func (a *Asset) DownloadProxy(proxy Proxy) (string, error) {
|
f, err := ioutil.TempFile(os.TempDir(), "update-")
|
if err != nil {
|
return "", errors.Wrap(err, "creating temp file")
|
}
|
|
log.Debugf("fetch %q", a.URL)
|
res, err := http.Get(a.URL)
|
if err != nil {
|
return "", errors.Wrap(err, "fetching asset")
|
}
|
|
kind := res.Header.Get("Content-Type")
|
size, _ := strconv.Atoi(res.Header.Get("Content-Length"))
|
log.Debugf("response %s – %s (%d KiB)", res.Status, kind, size/1024)
|
|
body := proxy(size, res.Body)
|
|
if res.StatusCode >= 400 {
|
body.Close()
|
return "", errors.Wrap(err, res.Status)
|
}
|
|
log.Debugf("copy to %q", f.Name())
|
if _, err := io.Copy(f, body); err != nil {
|
body.Close()
|
return "", errors.Wrap(err, "copying body")
|
}
|
|
if err := body.Close(); err != nil {
|
return "", errors.Wrap(err, "closing body")
|
}
|
|
if err := f.Close(); err != nil {
|
return "", errors.Wrap(err, "closing file")
|
}
|
|
log.Debugf("copied")
|
return f.Name(), nil
|
}
|
|
// copyFile copies the contents of the file named src to the file named
|
// by dst. The file will be created if it does not already exist. If the
|
// destination file exists, all it's contents will be replaced by the contents
|
// of the source file. The file mode will be copied from the source and
|
// the copied data is synced/flushed to stable storage.
|
func copyFile(dst, src string) (err error) {
|
in, err := os.Open(src)
|
if err != nil {
|
return
|
}
|
defer in.Close()
|
|
out, err := os.Create(dst)
|
if err != nil {
|
return
|
}
|
|
defer func() {
|
if e := out.Close(); e != nil {
|
err = e
|
}
|
}()
|
|
_, err = io.Copy(out, in)
|
if err != nil {
|
return
|
}
|
|
err = out.Sync()
|
if err != nil {
|
return
|
}
|
|
si, err := os.Stat(src)
|
if err != nil {
|
return
|
}
|
|
err = os.Chmod(dst, si.Mode())
|
if err != nil {
|
return
|
}
|
|
return
|
}
|
