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https://github.com/siderolabs/talos.git
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512c79e8d6
As of now, we're not using Go profiling, so it's safe to disable it to save some memory and CPU costs. Once we start using it, we can re-enable it conditionally. Each process allocates around 1.4MiB on amd64 for memory profiling buckets. Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
109 lines
2.5 KiB
Go
109 lines
2.5 KiB
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package main
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import (
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"errors"
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"fmt"
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"log"
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"os"
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"os/signal"
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"runtime"
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"syscall"
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"time"
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"github.com/talos-systems/go-procfs/procfs"
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"golang.org/x/sys/unix"
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"github.com/talos-systems/talos/internal/pkg/kmsg"
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"github.com/talos-systems/talos/internal/pkg/mount"
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"github.com/talos-systems/talos/internal/pkg/mount/switchroot"
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"github.com/talos-systems/talos/pkg/machinery/constants"
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"github.com/talos-systems/talos/pkg/version"
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)
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func init() {
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// Explicitly disable memory profiling to save around 1.4MiB of memory.
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runtime.MemProfileRate = 0
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}
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func run() (err error) {
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// Mount the pseudo devices.
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pseudo, err := mount.PseudoMountPoints()
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if err != nil {
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return err
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}
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if err = mount.Mount(pseudo); err != nil {
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return err
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}
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// Setup logging to /dev/kmsg.
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err = kmsg.SetupLogger(nil, "[talos] [initramfs]", nil)
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if err != nil {
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return err
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}
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log.Printf("booting Talos %s", version.Tag)
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// Mount the rootfs.
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log.Println("mounting the rootfs")
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squashfs, err := mount.SquashfsMountPoints(constants.NewRoot)
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if err != nil {
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return err
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}
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if err = mount.Mount(squashfs); err != nil {
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return err
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}
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// Switch into the new rootfs.
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log.Println("entering the rootfs")
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if err = switchroot.Switch(constants.NewRoot, pseudo); err != nil {
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return err
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}
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return nil
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}
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func recovery() {
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// If panic is set in the kernel flags, we'll hang instead of rebooting.
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// But we still allow users to hit CTRL+ALT+DEL to try and restart when they're ready.
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// Listening for these signals also keep us from deadlocking the goroutine.
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if r := recover(); r != nil {
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log.Printf("recovered from: %+v\n", r)
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p := procfs.ProcCmdline().Get(constants.KernelParamPanic).First()
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if p != nil && *p == "0" {
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log.Printf("panic=0 kernel flag found. sleeping forever")
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exitSignal := make(chan os.Signal, 1)
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signal.Notify(exitSignal, syscall.SIGINT, syscall.SIGTERM)
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<-exitSignal
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}
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for i := 10; i >= 0; i-- {
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log.Printf("rebooting in %d seconds\n", i)
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time.Sleep(1 * time.Second)
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}
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}
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// nolint: errcheck
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unix.Reboot(unix.LINUX_REBOOT_CMD_RESTART)
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}
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func main() {
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defer recovery()
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if err := run(); err != nil {
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panic(fmt.Errorf("early boot failed: %w", err))
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}
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// We should never reach this point if things are working as intended.
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panic(errors.New("unknown error"))
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}
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