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refactor: improve installation reliability

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This change aims to make installations more unified and reliable. It
introduces the concept of a mountpoint manager that is capable of
mounting, unmounting, and moving a set of mountpoints in the correct
order.

Signed-off-by: Andrew Rynhard <andrew@andrewrynhard.com>
This commit is contained in:
Andrew Rynhard
2019-07-31 17:16:10 +00:00
parent 9c63f4ed0a
commit ca35b85300
54 changed files with 1378 additions and 1244 deletions
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49
internal/app/init/main.go
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@@ -6,22 +6,27 @@ package main
import (
"log"
"time"
"github.com/pkg/errors"
"github.com/talos-systems/talos/internal/app/init/internal/mount"
"github.com/talos-systems/talos/internal/pkg/constants"
"github.com/talos-systems/talos/internal/pkg/kmsg"
"github.com/talos-systems/talos/internal/pkg/mount/manager"
"github.com/talos-systems/talos/internal/pkg/mount/manager/squashfs"
"github.com/talos-systems/talos/internal/pkg/mount/manager/virtual"
"github.com/talos-systems/talos/internal/pkg/mount/switchroot"
"golang.org/x/sys/unix"
)
// nolint: gocyclo
func initram() (err error) {
var initializer *mount.Initializer
if initializer, err = mount.NewInitializer(constants.NewRoot); err != nil {
func run() (err error) {
// Mount the virtual devices.
mountpoints, err := virtual.MountPoints()
if err != nil {
return err
}
// Mount the special devices.
if err = initializer.InitSpecial(); err != nil {
virtual := manager.NewManager(mountpoints)
if err = virtual.MountAll(); err != nil {
return err
}
@@ -31,23 +36,43 @@ func initram() (err error) {
return err
}
// Perform the equivalent of switch_root.
// Mount the rootfs.
log.Println("mounting the rootfs")
if err = initializer.Rootfs(); err != nil {
mountpoints, err = squashfs.MountPoints(constants.NewRoot)
if err != nil {
return err
}
squashfs := manager.NewManager(mountpoints)
if err = squashfs.MountAll(); err != nil {
return err
}
// Perform the equivalent of switch_root.
// Switch into the new rootfs.
log.Println("entering the rootfs")
if err = initializer.Switch(); err != nil {
if err = switchroot.Switch(constants.NewRoot, virtual); err != nil {
return err
}
return nil
}
func recovery() {
if r := recover(); r != nil {
log.Printf("recovered from: %+v\n", r)
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)
}
func main() {
if err := initram(); err != nil {
defer recovery()
if err := run(); err != nil {
panic(errors.Wrap(err, "early boot failed"))
}