/
backend.go
206 lines (191 loc) · 5.31 KB
/
backend.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
package internal
import (
"crypto/rand"
"encoding/base64"
"fmt"
"net/url"
"os"
"strings"
"github.com/cupcakearmy/autorestic/internal/colors"
"github.com/cupcakearmy/autorestic/internal/flags"
)
type BackendRest struct {
User string `mapstructure:"user,omitempty"`
Password string `mapstructure:"password,omitempty"`
}
type Backend struct {
name string
Type string `mapstructure:"type,omitempty"`
Path string `mapstructure:"path,omitempty"`
Key string `mapstructure:"key,omitempty"`
Env map[string]string `mapstructure:"env,omitempty"`
Rest BackendRest `mapstructure:"rest,omitempty"`
Options Options `mapstructure:"options,omitempty"`
}
func GetBackend(name string) (Backend, bool) {
b, ok := GetConfig().Backends[name]
b.name = name
return b, ok
}
func (b Backend) generateRepo() (string, error) {
switch b.Type {
case "local":
return GetPathRelativeToConfig(b.Path)
case "rest":
parsed, err := url.Parse(os.ExpandEnv(b.Path))
if err != nil {
return "", err
}
if b.Rest.User != "" {
if b.Rest.Password == "" {
parsed.User = url.User(b.Rest.User)
} else {
parsed.User = url.UserPassword(b.Rest.User, b.Rest.Password)
}
}
return fmt.Sprintf("%s:%s", b.Type, parsed.String()), nil
case "b2", "azure", "gs", "s3", "sftp", "rclone":
return fmt.Sprintf("%s:%s", b.Type, b.Path), nil
default:
return "", fmt.Errorf("backend type \"%s\" is invalid", b.Type)
}
}
func (b Backend) getEnv() (map[string]string, error) {
env := make(map[string]string)
// Key
if b.Key != "" {
env["RESTIC_PASSWORD"] = b.Key
}
// From config file
repo, err := b.generateRepo()
env["RESTIC_REPOSITORY"] = repo
for key, value := range b.Env {
env[strings.ToUpper(key)] = value
}
// From Envfile and passed as env
var prefix = "AUTORESTIC_" + strings.ToUpper(b.name) + "_"
for _, variable := range os.Environ() {
var splitted = strings.SplitN(variable, "=", 2)
if strings.HasPrefix(splitted[0], prefix) {
env[strings.TrimPrefix(splitted[0], prefix)] = splitted[1]
}
}
return env, err
}
func generateRandomKey() string {
b := make([]byte, 64)
rand.Read(b)
key := base64.StdEncoding.EncodeToString(b)
key = strings.ReplaceAll(key, "=", "")
key = strings.ReplaceAll(key, "+", "")
key = strings.ReplaceAll(key, "/", "")
return key
}
func (b Backend) validate() error {
if b.Type == "" {
return fmt.Errorf(`Backend "%s" has no "type"`, b.name)
}
if b.Path == "" {
return fmt.Errorf(`Backend "%s" has no "path"`, b.name)
}
if b.Key == "" {
// Check if key is set in environment
env, _ := b.getEnv()
if _, found := env["RESTIC_PASSWORD"]; !found {
// No key set in config file or env => generate random key and save file
key := generateRandomKey()
b.Key = key
c := GetConfig()
tmp := c.Backends[b.name]
tmp.Key = key
c.Backends[b.name] = tmp
if err := c.SaveConfig(); err != nil {
return err
}
}
}
env, err := b.getEnv()
if err != nil {
return err
}
options := ExecuteOptions{Envs: env, Silent: true}
// Check if already initialized
cmd := []string{"check"}
cmd = append(cmd, combineBackendOptions("check", b)...)
_, _, err = ExecuteResticCommand(options, cmd...)
if err == nil {
return nil
} else {
// If not initialize
colors.Body.Printf("Initializing backend \"%s\"...\n", b.name)
cmd := []string{"init"}
cmd = append(cmd, combineBackendOptions("init", b)...)
_, _, err := ExecuteResticCommand(options, cmd...)
return err
}
}
func (b Backend) Exec(args []string) error {
env, err := b.getEnv()
if err != nil {
return err
}
options := ExecuteOptions{Envs: env}
args = append(args, combineBackendOptions("exec", b)...)
_, out, err := ExecuteResticCommand(options, args...)
if err != nil {
colors.Error.Println(out)
return err
}
return nil
}
func (b Backend) ExecDocker(l Location, args []string) (int, string, error) {
env, err := b.getEnv()
if err != nil {
return -1, "", err
}
volume := l.From[0]
options := ExecuteOptions{
Command: "docker",
Envs: env,
}
dir := "/data"
args = append([]string{"restic"}, args...)
docker := []string{
"run", "--rm",
"--entrypoint", "ash",
"--workdir", dir,
"--volume", volume + ":" + dir,
}
// Use of docker host, not the container host
if hostname, err := os.Hostname(); err == nil {
docker = append(docker, "--hostname", hostname)
}
switch b.Type {
case "local":
actual := env["RESTIC_REPOSITORY"]
docker = append(docker, "--volume", actual+":"+"/repo")
env["RESTIC_REPOSITORY"] = "/repo"
case "b2":
case "s3":
case "azure":
case "gs":
case "rest":
// No additional setup needed
case "rclone":
// Read host rclone config and mount it into the container
code, configFile, err := ExecuteCommand(ExecuteOptions{Command: "rclone"}, "config", "file")
if err != nil {
return code, "", err
}
splitted := strings.Split(strings.TrimSpace(configFile), "\n")
configFilePath := splitted[len(splitted)-1]
docker = append(docker, "--volume", configFilePath+":"+"/root/.config/rclone/rclone.conf:ro")
default:
return -1, "", fmt.Errorf("Backend type \"%s\" is not supported as volume endpoint", b.Type)
}
for key, value := range env {
docker = append(docker, "--env", key+"="+value)
}
docker = append(docker, flags.DOCKER_IMAGE, "-c", strings.Join(args, " "))
return ExecuteCommand(options, docker...)
}