-
Notifications
You must be signed in to change notification settings - Fork 458
/
main.go
254 lines (196 loc) · 6.62 KB
/
main.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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
// 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 init implements booting process.
package main
import (
"errors"
"fmt"
"log"
"os"
"os/signal"
"path/filepath"
"runtime"
"strings"
"syscall"
"time"
"github.com/freddierice/go-losetup/v2"
"github.com/klauspost/cpuid/v2"
"github.com/siderolabs/go-kmsg"
"github.com/siderolabs/go-procfs/procfs"
"golang.org/x/sys/unix"
"github.com/siderolabs/talos/internal/pkg/mount"
"github.com/siderolabs/talos/internal/pkg/mount/switchroot"
"github.com/siderolabs/talos/internal/pkg/rng"
"github.com/siderolabs/talos/internal/pkg/secureboot"
"github.com/siderolabs/talos/internal/pkg/secureboot/tpm2"
"github.com/siderolabs/talos/pkg/machinery/constants"
"github.com/siderolabs/talos/pkg/machinery/extensions"
"github.com/siderolabs/talos/pkg/machinery/version"
)
func init() {
// Explicitly disable memory profiling to save around 1.4MiB of memory.
runtime.MemProfileRate = 0
}
func run() (err error) {
// Mount the pseudo devices.
pseudo, err := mount.PseudoMountPoints()
if err != nil {
return err
}
if err = mount.Mount(pseudo); err != nil {
return err
}
// Setup logging to /dev/kmsg.
err = kmsg.SetupLogger(nil, "[talos] [initramfs]", nil)
if err != nil {
return err
}
// Seed RNG.
if err = rng.TPMSeed(); err != nil {
// not making this fatal error
log.Printf("failed to seed from the TPM: %s", err)
}
// extend PCR 11 with enter-initrd
if err = tpm2.PCRExtent(secureboot.UKIPCR, []byte(secureboot.EnterInitrd)); err != nil {
return fmt.Errorf("failed to extend PCR %d with enter-initrd: %v", secureboot.UKIPCR, err)
}
log.Printf("booting Talos %s", version.Tag)
cpuInfo()
// Mount the rootfs.
if err = mountRootFS(); err != nil {
return err
}
// Bind mount the lib/firmware if needed.
if err = bindMountFirmware(); err != nil {
return err
}
// Bind mount /.extra if needed.
if err = bindMountExtra(); err != nil {
return err
}
// Switch into the new rootfs.
log.Println("entering the rootfs")
return switchroot.Switch(constants.NewRoot, pseudo)
}
func recovery() {
// If panic is set in the kernel flags, we'll hang instead of rebooting.
// But we still allow users to hit CTRL+ALT+DEL to try and restart when they're ready.
// Listening for these signals also keep us from deadlocking the goroutine.
if r := recover(); r != nil {
log.Printf("recovered from: %+v\n", r)
p := procfs.ProcCmdline().Get(constants.KernelParamPanic).First()
if p != nil && *p == "0" {
log.Printf("panic=0 kernel flag found. sleeping forever")
exitSignal := make(chan os.Signal, 1)
signal.Notify(exitSignal, syscall.SIGINT, syscall.SIGTERM)
<-exitSignal
}
for i := 10; i >= 0; i-- {
log.Printf("rebooting in %d seconds\n", i)
time.Sleep(1 * time.Second)
}
}
//nolint:errcheck
unix.Reboot(unix.LINUX_REBOOT_CMD_RESTART)
}
//nolint:gocyclo
func mountRootFS() error {
log.Println("mounting the rootfs")
var extensionsConfig extensions.Config
if err := extensionsConfig.Read(constants.ExtensionsConfigFile); err != nil {
if !os.IsNotExist(err) {
return err
}
}
// if no extensions found use plain squashfs mount
if len(extensionsConfig.Layers) == 0 {
squashfs, err := mount.SquashfsMountPoints(constants.NewRoot)
if err != nil {
return err
}
return mount.Mount(squashfs)
}
// otherwise compose overlay mounts
type layer struct {
name string
image string
}
layers := []layer{}
squashfs := mount.NewMountPoints()
// going in the inverse order as earlier layers are overlayed on top of the latter ones
for i := len(extensionsConfig.Layers) - 1; i >= 0; i-- {
layers = append(layers, layer{
name: fmt.Sprintf("layer%d", i),
image: extensionsConfig.Layers[i].Image,
})
log.Printf("enabling system extension %s %s", extensionsConfig.Layers[i].Metadata.Name, extensionsConfig.Layers[i].Metadata.Version)
}
layers = append(layers, layer{
name: "root",
image: "/" + constants.RootfsAsset,
})
overlays := make([]string, 0, len(layers))
for _, layer := range layers {
dev, err := losetup.Attach(layer.image, 0, true)
if err != nil {
return err
}
p := mount.NewMountPoint(dev.Path(), "/"+layer.name, "squashfs", unix.MS_RDONLY|unix.MS_I_VERSION, "", mount.WithPrefix(constants.ExtensionLayers), mount.WithFlags(mount.ReadOnly|mount.Shared))
overlays = append(overlays, p.Target())
squashfs.Set(layer.name, p)
}
if err := mount.Mount(squashfs); err != nil {
return err
}
overlay := mount.NewMountPoints()
overlay.Set(constants.NewRoot, mount.NewMountPoint(strings.Join(overlays, ":"), constants.NewRoot, "", unix.MS_I_VERSION, "", mount.WithFlags(mount.ReadOnly|mount.ReadonlyOverlay|mount.Shared)))
if err := mount.Mount(overlay); err != nil {
return err
}
if err := mount.Unmount(squashfs); err != nil {
return err
}
return unix.Mount(constants.ExtensionsConfigFile, filepath.Join(constants.NewRoot, constants.ExtensionsRuntimeConfigFile), "", unix.MS_BIND|unix.MS_RDONLY, "")
}
func bindMountFirmware() error {
if _, err := os.Stat(constants.FirmwarePath); err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
log.Printf("bind mounting %s", constants.FirmwarePath)
return unix.Mount(constants.FirmwarePath, filepath.Join(constants.NewRoot, constants.FirmwarePath), "", unix.MS_BIND|unix.MS_RDONLY, "")
}
func bindMountExtra() error {
if _, err := os.Stat(constants.SDStubDynamicInitrdPath); err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
log.Printf("bind mounting %s", constants.SDStubDynamicInitrdPath)
return unix.Mount(constants.SDStubDynamicInitrdPath, filepath.Join(constants.NewRoot, constants.SDStubDynamicInitrdPath), "", unix.MS_BIND|unix.MS_RDONLY, "")
}
func cpuInfo() {
log.Printf("CPU: %s, %d core(s), %d thread(s) per core", cpuid.CPU.BrandName, cpuid.CPU.PhysicalCores, cpuid.CPU.ThreadsPerCore)
if runtime.GOARCH == "amd64" {
log.Printf("x86_64 microarchitecture level: %d", cpuid.CPU.X64Level())
if cpuid.CPU.X64Level() < constants.MinimumGOAMD64Level {
if cpuid.CPU.VM() {
log.Printf("it might be that the VM is configured with an older CPU model, please check the VM configuration")
}
log.Printf("x86_64 microarchitecture level %d or higher is required, halting", constants.MinimumGOAMD64Level)
time.Sleep(365 * 24 * time.Hour)
}
}
}
func main() {
defer recovery()
if err := run(); err != nil {
panic(fmt.Errorf("early boot failed: %w", err))
}
// We should never reach this point if things are working as intended.
panic(errors.New("unknown error"))
}