forked from syncthing/syncthing
/
upgrade_unix.go
146 lines (123 loc) · 2.79 KB
/
upgrade_unix.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
// +build !windows
package main
import (
"archive/tar"
"compress/gzip"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path"
"path/filepath"
"runtime"
"strings"
"bitbucket.org/kardianos/osext"
)
type githubRelease struct {
Tag string `json:"tag_name"`
Prelease bool `json:"prerelease"`
Assets []githubAsset `json:"assets"`
}
type githubAsset struct {
URL string `json:"url"`
Name string `json:"name"`
}
func upgrade() error {
path, err := osext.Executable()
if err != nil {
return err
}
resp, err := http.Get("https://api.github.com/repos/calmh/syncthing/releases?per_page=1")
if err != nil {
return err
}
var rels []githubRelease
json.NewDecoder(resp.Body).Decode(&rels)
resp.Body.Close()
if len(rels) != 1 {
return fmt.Errorf("Unexpected number of releases: %d", len(rels))
}
rel := rels[0]
if rel.Tag > Version {
infof("Attempting upgrade to %s...", rel.Tag)
} else if rel.Tag == Version {
okf("Already running the latest version, %s. Not upgrading.", Version)
return nil
} else {
okf("Current version %s is newer than latest release %s. Not upgrading.", Version, rel.Tag)
return nil
}
expectedRelease := fmt.Sprintf("syncthing-%s-%s-%s.", runtime.GOOS, runtime.GOARCH, rel.Tag)
for _, asset := range rel.Assets {
if strings.HasPrefix(asset.Name, expectedRelease) {
if strings.HasSuffix(asset.Name, ".tar.gz") {
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
}
okf("Upgraded %q to %s.", path, rel.Tag)
okf("Previous version saved in %q.", old)
return nil
}
}
}
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")
}