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// Copyright (C) 2014 Jakob Borg and other contributors. All rights reserved.
// Use of this source code is governed by an MIT-style license that can be
// found in the LICENSE file.
// +build !solaris,!windows
package main
import (
"archive/tar"
"compress/gzip"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path"
"path/filepath"
"runtime"
"strconv"
"strings"
"bytes"
"bitbucket.org/kardianos/osext"
)
type githubRelease struct {
Tag string `json:"tag_name"`
Prerelease bool `json:"prerelease"`
Assets []githubAsset `json:"assets"`
}
type githubAsset struct {
URL string `json:"url"`
Name string `json:"name"`
}
var GoArchExtra string // "", "v5", "v6", "v7"
func upgrade() error {
if runtime.GOOS == "windows" {
return errors.New("Upgrade currently unsupported on Windows")
}
path, err := osext.Executable()
if err != nil {
return err
}
resp, err := http.Get("https://api.github.com/repos/calmh/syncthing/releases?per_page=10")
if err != nil {
return err
}
var rels []githubRelease
json.NewDecoder(resp.Body).Decode(&rels)
resp.Body.Close()
var rel githubRelease
for _, trel := range rels {
if !trel.Prerelease {
rel = trel
break
}
}
if len(rel.Tag) == 0 {
return errors.New("no suitable release found")
}
switch compareVersions(rel.Tag, Version) {
case -1:
l.Okf("Current version %s is newer than latest release %s. Not upgrading.", Version, rel.Tag)
return nil
case 0:
l.Okf("Already running the latest version, %s. Not upgrading.", Version)
return nil
default:
l.Infof("Attempting upgrade to %s...", rel.Tag)
}
expectedRelease := fmt.Sprintf("syncthing-%s-%s%s-%s.", runtime.GOOS, runtime.GOARCH, GoArchExtra, rel.Tag)
for _, asset := range rel.Assets {
if strings.HasPrefix(asset.Name, expectedRelease) {
if strings.HasSuffix(asset.Name, ".tar.gz") {
l.Infof("Downloading %s...", asset.Name)
fname, err := readTarGZ(asset.URL, filepath.Dir(path))
if err != nil {
return err
}
old := path + "." + Version
err = os.Rename(path, old)
if err != nil {
return err
}
err = os.Rename(fname, path)
if err != nil {
return err
}
l.Okf("Upgraded %q to %s.", path, rel.Tag)
l.Okf("Previous version saved in %q.", old)
return nil
}
}
}
l.Warnf("Found no asset for %q", expectedRelease)
return nil
}
func readTarGZ(url string, dir string) (string, error) {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return "", err
}
req.Header.Add("Accept", "application/octet-stream")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
gr, err := gzip.NewReader(resp.Body)
if err != nil {
return "", err
}
tr := tar.NewReader(gr)
if err != nil {
return "", err
}
// Iterate through the files in the archive.
for {
hdr, err := tr.Next()
if err == io.EOF {
// end of tar archive
break
}
if err != nil {
return "", err
}
if path.Base(hdr.Name) == "syncthing" {
of, err := ioutil.TempFile(dir, "syncthing")
if err != nil {
return "", err
}
io.Copy(of, tr)
err = of.Close()
if err != nil {
os.Remove(of.Name())
return "", err
}
os.Chmod(of.Name(), os.FileMode(hdr.Mode))
return of.Name(), nil
}
}
return "", fmt.Errorf("No upgrade found")
}
func compareVersions(a, b string) int {
return bytes.Compare(versionParts(a), versionParts(b))
}
func versionParts(v string) []byte {
parts := strings.Split(v, "-")
fields := strings.Split(parts[0], ".")
res := make([]byte, len(fields))
for i, s := range fields {
v, _ := strconv.Atoi(s)
res[i] = byte(v)
}
return res
}
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