forked from syncthing/syncthing
/
upgrade_common.go
227 lines (202 loc) · 4.84 KB
/
upgrade_common.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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
// Package upgrade downloads and compares releases, and upgrades the running binary.
package upgrade
import (
"errors"
"fmt"
"runtime"
"strconv"
"strings"
"github.com/kardianos/osext"
)
type Release struct {
Tag string `json:"tag_name"`
Prerelease bool `json:"prerelease"`
Assets []Asset `json:"assets"`
}
type Asset struct {
URL string `json:"url"`
Name string `json:"name"`
}
var (
ErrVersionUpToDate = errors.New("current version is up to date")
ErrVersionUnknown = errors.New("couldn't fetch release information")
ErrUpgradeUnsupported = errors.New("upgrade unsupported")
ErrUpgradeInProgress = errors.New("upgrade already in progress")
upgradeUnlocked = make(chan bool, 1)
)
func init() {
upgradeUnlocked <- true
}
func To(rel Release) error {
select {
case <-upgradeUnlocked:
path, err := osext.Executable()
if err != nil {
upgradeUnlocked <- true
return err
}
err = upgradeTo(path, rel)
// If we've failed to upgrade, unlock so that another attempt could be made
if err != nil {
upgradeUnlocked <- true
}
return err
default:
return ErrUpgradeInProgress
}
}
func ToURL(url string) error {
select {
case <-upgradeUnlocked:
path, err := osext.Executable()
if err != nil {
upgradeUnlocked <- true
return err
}
err = upgradeToURL(path, url)
// If we've failed to upgrade, unlock so that another attempt could be made
if err != nil {
upgradeUnlocked <- true
}
return err
default:
return ErrUpgradeInProgress
}
}
type Relation int
const (
MajorOlder Relation = -2 // Older by a major version (x in x.y.z or 0.x.y).
Older = -1 // Older by a minor version (y or z in x.y.z, or y in 0.x.y)
Equal = 0 // Versions are semantically equal
Newer = 1 // Newer by a minor version (y or z in x.y.z, or y in 0.x.y)
MajorNewer = 2 // Newer by a major version (x in x.y.z or 0.x.y).
)
// CompareVersions returns a relation describing how a compares to b.
func CompareVersions(a, b string) Relation {
arel, apre := versionParts(a)
brel, bpre := versionParts(b)
minlen := len(arel)
if l := len(brel); l < minlen {
minlen = l
}
// First compare major-minor-patch versions
for i := 0; i < minlen; i++ {
if arel[i] < brel[i] {
if i == 0 {
return MajorOlder
}
if i == 1 && arel[0] == 0 {
return MajorOlder
}
return Older
}
if arel[i] > brel[i] {
if i == 0 {
return MajorNewer
}
if i == 1 && arel[0] == 0 {
return MajorNewer
}
return Newer
}
}
// Longer version is newer, when the preceding parts are equal
if len(arel) < len(brel) {
return Older
}
if len(arel) > len(brel) {
return Newer
}
// Prerelease versions are older, if the versions are the same
if len(apre) == 0 && len(bpre) > 0 {
return Newer
}
if len(apre) > 0 && len(bpre) == 0 {
return Older
}
minlen = len(apre)
if l := len(bpre); l < minlen {
minlen = l
}
// Compare prerelease strings
for i := 0; i < minlen; i++ {
switch av := apre[i].(type) {
case int:
switch bv := bpre[i].(type) {
case int:
if av < bv {
return Older
}
if av > bv {
return Newer
}
case string:
return Older
}
case string:
switch bv := bpre[i].(type) {
case int:
return Newer
case string:
if av < bv {
return Older
}
if av > bv {
return Newer
}
}
}
}
// If all else is equal, longer prerelease string is newer
if len(apre) < len(bpre) {
return Older
}
if len(apre) > len(bpre) {
return Newer
}
// Looks like they're actually the same
return Equal
}
// Split a version into parts.
// "1.2.3-beta.2" -> []int{1, 2, 3}, []interface{}{"beta", 2}
func versionParts(v string) ([]int, []interface{}) {
if strings.HasPrefix(v, "v") || strings.HasPrefix(v, "V") {
// Strip initial 'v' or 'V' prefix if present.
v = v[1:]
}
parts := strings.SplitN(v, "+", 2)
parts = strings.SplitN(parts[0], "-", 2)
fields := strings.Split(parts[0], ".")
release := make([]int, len(fields))
for i, s := range fields {
v, _ := strconv.Atoi(s)
release[i] = v
}
var prerelease []interface{}
if len(parts) > 1 {
fields = strings.Split(parts[1], ".")
prerelease = make([]interface{}, len(fields))
for i, s := range fields {
v, err := strconv.Atoi(s)
if err == nil {
prerelease[i] = v
} else {
prerelease[i] = s
}
}
}
return release, prerelease
}
func releaseName(tag string) string {
switch runtime.GOOS {
case "darwin":
return fmt.Sprintf("syncthing-macosx-%s-%s.", runtime.GOARCH, tag)
default:
return fmt.Sprintf("syncthing-%s-%s-%s.", runtime.GOOS, runtime.GOARCH, tag)
}
}