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
|
// -*- 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 boot
import (
"fmt"
"io"
"github.com/snapcore/snapd/bootloader"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/osutil"
)
// DumpBootVars writes a dump of the snapd bootvars to the given writer
func DumpBootVars(w io.Writer, dir string, uc20 bool) error {
opts := &bootloader.Options{
NoSlashBoot: dir != "" && dir != "/",
}
switch dir {
// is it any of the well-known UC20 boot partition mount locations?
case InitramfsUbuntuBootDir:
opts.Role = bootloader.RoleRunMode
uc20 = true
case InitramfsUbuntuSeedDir:
opts.Role = bootloader.RoleRecovery
uc20 = true
}
if !opts.NoSlashBoot && !uc20 {
// this may still be a UC20 system
if osutil.FileExists(dirs.SnapModeenvFile) {
uc20 = true
}
}
allKeys := []string{
"snap_mode",
"snap_core",
"snap_try_core",
"snap_kernel",
"snap_try_kernel",
}
if uc20 {
if !opts.NoSlashBoot {
// no root directory set, default ot run mode
opts.Role = bootloader.RoleRunMode
}
// keys relevant to all uc20 bootloader implementations
allKeys = []string{
"snapd_recovery_mode",
"snapd_recovery_system",
"snapd_recovery_kernel",
"snap_kernel",
"kernel_status",
}
}
bloader, err := bootloader.Find(dir, opts)
if err != nil {
return err
}
bootVars, err := bloader.GetBootVars(allKeys...)
if err != nil {
return err
}
for _, k := range allKeys {
fmt.Fprintf(w, "%s=%s\n", k, bootVars[k])
}
return nil
}
|
