syncthing/internal/upgrade/upgrade_supported.go

168 lines
3.6 KiB
Go

// Copyright (C) 2014 The Syncthing Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
// +build !windows,!noupgrade
package upgrade
import (
"archive/tar"
"compress/gzip"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path"
"path/filepath"
"strings"
)
// Upgrade to the given release, saving the previous binary with a ".old" extension.
func upgradeTo(path string, rel Release) error {
expectedRelease := releaseName(rel.Tag)
if debug {
l.Debugf("expected release asset %q", expectedRelease)
}
for _, asset := range rel.Assets {
if debug {
l.Debugln("considering release", asset)
}
if strings.HasPrefix(asset.Name, expectedRelease) {
if strings.HasSuffix(asset.Name, ".tar.gz") {
fname, err := readTarGZ(asset.URL, filepath.Dir(path))
if err != nil {
return err
}
old := path + ".old"
err = os.Rename(path, old)
if err != nil {
return err
}
err = os.Rename(fname, path)
if err != nil {
return err
}
return nil
}
}
}
return ErrVersionUnknown
}
// Returns the latest release, including prereleases or not depending on the argument
func LatestRelease(prerelease bool) (Release, error) {
resp, err := http.Get("https://api.github.com/repos/syncthing/syncthing/releases?per_page=10")
if err != nil {
return Release{}, err
}
if resp.StatusCode > 299 {
return Release{}, fmt.Errorf("API call returned HTTP error: %s", resp.Status)
}
var rels []Release
json.NewDecoder(resp.Body).Decode(&rels)
resp.Body.Close()
if len(rels) == 0 {
return Release{}, ErrVersionUnknown
}
if prerelease {
// We are a beta version. Use the latest.
return rels[0], nil
}
// We are a regular release. Only consider non-prerelease versions for upgrade.
for _, rel := range rels {
if !rel.Prerelease {
return rel, nil
}
}
return Release{}, ErrVersionUnknown
}
func readTarGZ(url string, dir string) (string, error) {
if debug {
l.Debugf("loading %q", url)
}
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)
// 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 debug {
l.Debugf("considering file %q", hdr.Name)
}
if path.Base(hdr.Name) == "syncthing" {
of, err := ioutil.TempFile(dir, "syncthing")
if err != nil {
return "", err
}
_, err = io.Copy(of, tr)
if err != nil {
os.Remove(of.Name())
return "", err
}
err = of.Close()
if err != nil {
os.Remove(of.Name())
return "", err
}
err = os.Chmod(of.Name(), os.FileMode(hdr.Mode))
if err != nil {
os.Remove(of.Name())
return "", err
}
return of.Name(), nil
}
}
return "", fmt.Errorf("No upgrade found")
}