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
|
// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2019 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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/>.
*
*/
package main
import (
"fmt"
"io"
"os"
"path/filepath"
"github.com/jessevdk/go-flags"
"github.com/snapcore/snapd/image/preseed"
// for SanitizePlugsSlots
"github.com/snapcore/snapd/interfaces/builtin"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/snap"
)
const (
shortHelp = "Prerun the first boot seeding of snaps in an image filesystem chroot with a snapd seed."
longHelp = `
The snap-preseed command takes a directory containing an image, including seed
snaps (at /var/lib/snapd/seed), and runs through the snapd first-boot process
up to hook execution. No boot actions unrelated to snapd are performed.
It creates systemd units for seeded snaps, makes any connections, and generates
security profiles. The image is updated and consequently optimised to reduce
first-boot startup time`
)
type options struct {
Reset bool `long:"reset"`
ResetChroot bool `long:"reset-chroot" hidden:"1"`
PreseedSignKey string `long:"preseed-sign-key"`
AppArmorFeaturesDir string `long:"apparmor-features-dir"`
SysfsOverlay string `long:"sysfs-overlay"`
}
var (
osGetuid = os.Getuid
// unused currently, left in place for consistency for when it is needed
// Stdout io.Writer = os.Stdout
Stderr io.Writer = os.Stderr
preseedCore20 = preseed.Core20
preseedClassic = preseed.Classic
preseedClassicReset = preseed.ClassicReset
preseedResetPreseededChroot = preseed.ResetPreseededChroot
opts options
)
func Parser() *flags.Parser {
opts = options{}
parser := flags.NewParser(&opts, flags.HelpFlag|flags.PassDoubleDash|flags.PassAfterNonOption)
parser.ShortDescription = shortHelp
parser.LongDescription = longHelp
return parser
}
func probeCore20ImageDir(dir string) bool {
sysDir := filepath.Join(dir, "system-seed")
_, isDir, _ := osutil.DirExists(sysDir)
return isDir
}
func main() {
parser := Parser()
if err := run(parser, os.Args[1:]); err != nil {
fmt.Fprintf(Stderr, "error: %v\n", err)
os.Exit(1)
}
}
func run(parser *flags.Parser, args []string) (err error) {
// real validation of plugs and slots; needs to be set
// for processing of seeds with gadget because of readInfo().
snap.SanitizePlugsSlots = builtin.SanitizePlugsSlots
rest, err := parser.ParseArgs(args)
if err != nil {
return err
}
if osGetuid() != 0 {
return fmt.Errorf("must be run as root")
}
var chrootDir string
if opts.ResetChroot {
chrootDir = "/"
} else {
if len(rest) == 0 {
return fmt.Errorf("need chroot path as argument")
}
chrootDir, err = filepath.Abs(rest[0])
if err != nil {
return err
}
// safety check
if chrootDir == "/" {
return fmt.Errorf("cannot run snap-preseed against /")
}
}
if probeCore20ImageDir(chrootDir) {
if opts.Reset || opts.ResetChroot {
return fmt.Errorf("cannot snap-preseed --reset for Ubuntu Core")
}
coreOpts := &preseed.CoreOptions{
PrepareImageDir: chrootDir,
PreseedSignKey: opts.PreseedSignKey,
AppArmorKernelFeaturesDir: opts.AppArmorFeaturesDir,
SysfsOverlay: opts.SysfsOverlay,
}
return preseedCore20(coreOpts)
}
if opts.ResetChroot {
return preseedResetPreseededChroot(chrootDir)
}
if opts.Reset {
return preseedClassicReset(chrootDir)
}
return preseedClassic(chrootDir)
}
|
