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reset.go
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reset.go
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/*
Copyright © 2022 SUSE LLC
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package action
import (
"fmt"
agentConfig "github.com/kairos-io/kairos-agent/v2/pkg/config"
"path/filepath"
"time"
cnst "github.com/kairos-io/kairos-agent/v2/pkg/constants"
"github.com/kairos-io/kairos-agent/v2/pkg/elemental"
v1 "github.com/kairos-io/kairos-agent/v2/pkg/types/v1"
"github.com/kairos-io/kairos-agent/v2/pkg/utils"
)
func (r *ResetAction) resetHook(hook string, chroot bool) error {
if chroot {
extraMounts := map[string]string{}
persistent := r.spec.Partitions.Persistent
if persistent != nil && persistent.MountPoint != "" {
extraMounts[persistent.MountPoint] = cnst.UsrLocalPath
}
oem := r.spec.Partitions.OEM
if oem != nil && oem.MountPoint != "" {
extraMounts[oem.MountPoint] = cnst.OEMPath
}
return ChrootHook(r.cfg, hook, r.spec.Active.MountPoint, extraMounts)
}
return Hook(r.cfg, hook)
}
type ResetAction struct {
cfg *agentConfig.Config
spec *v1.ResetSpec
}
func NewResetAction(cfg *agentConfig.Config, spec *v1.ResetSpec) *ResetAction {
return &ResetAction{cfg: cfg, spec: spec}
}
func (r *ResetAction) updateInstallState(e *elemental.Elemental, cleanup *utils.CleanStack, meta interface{}) error {
if r.spec.Partitions.Recovery == nil || r.spec.Partitions.State == nil {
return fmt.Errorf("undefined state or recovery partition")
}
installState := &v1.InstallState{
Date: time.Now().Format(time.RFC3339),
Partitions: map[string]*v1.PartitionState{
cnst.StatePartName: {
FSLabel: r.spec.Partitions.State.FilesystemLabel,
Images: map[string]*v1.ImageState{
cnst.ActiveImgName: {
Source: r.spec.Active.Source,
SourceMetadata: meta,
Label: r.spec.Active.Label,
FS: r.spec.Active.FS,
},
cnst.PassiveImgName: {
Source: r.spec.Active.Source,
SourceMetadata: meta,
Label: r.spec.Passive.Label,
FS: r.spec.Passive.FS,
},
},
},
},
}
if r.spec.Partitions.OEM != nil {
installState.Partitions[cnst.OEMPartName] = &v1.PartitionState{
FSLabel: r.spec.Partitions.OEM.FilesystemLabel,
}
}
if r.spec.Partitions.Persistent != nil {
installState.Partitions[cnst.PersistentPartName] = &v1.PartitionState{
FSLabel: r.spec.Partitions.Persistent.FilesystemLabel,
}
}
if r.spec.State != nil && r.spec.State.Partitions != nil {
installState.Partitions[cnst.RecoveryPartName] = r.spec.State.Partitions[cnst.RecoveryPartName]
}
umount, err := e.MountRWPartition(r.spec.Partitions.Recovery)
if err != nil {
return err
}
cleanup.Push(umount)
return r.cfg.WriteInstallState(
installState,
filepath.Join(r.spec.Partitions.State.MountPoint, cnst.InstallStateFile),
filepath.Join(r.spec.Partitions.Recovery.MountPoint, cnst.InstallStateFile),
)
}
// ResetRun will reset the cos system to by following several steps
func (r ResetAction) Run() (err error) {
e := elemental.NewElemental(r.cfg)
cleanup := utils.NewCleanStack()
defer func() { err = cleanup.Cleanup(err) }()
// Unmount partitions if any is already mounted before formatting
err = e.UnmountPartitions(r.spec.Partitions.PartitionsByMountPoint(true, r.spec.Partitions.Recovery))
if err != nil {
return err
}
// Reformat state partition
err = e.FormatPartition(r.spec.Partitions.State)
if err != nil {
return err
}
// Reformat persistent partition
if r.spec.FormatPersistent {
persistent := r.spec.Partitions.Persistent
if persistent != nil {
err = e.FormatPartition(persistent)
if err != nil {
return err
}
}
}
// Reformat OEM
if r.spec.FormatOEM {
oem := r.spec.Partitions.OEM
if oem != nil {
err = e.FormatPartition(oem)
if err != nil {
return err
}
}
}
// Mount configured partitions
err = e.MountPartitions(r.spec.Partitions.PartitionsByMountPoint(false, r.spec.Partitions.Recovery))
if err != nil {
return err
}
cleanup.Push(func() error {
return e.UnmountPartitions(r.spec.Partitions.PartitionsByMountPoint(true, r.spec.Partitions.Recovery))
})
// Before reset hook happens once partitions are aready and before deploying the OS image
err = r.resetHook(cnst.BeforeResetHook, false)
if err != nil {
return err
}
// Deploy active image
meta, err := e.DeployImage(&r.spec.Active, true)
if err != nil {
return err
}
cleanup.Push(func() error { return e.UnmountImage(&r.spec.Active) })
// Create extra dirs in rootfs as afterwards this will be impossible due to RO system
createExtraDirsInRootfs(r.cfg, r.spec.ExtraDirsRootfs, r.spec.Active.MountPoint)
// install grub
grub := utils.NewGrub(r.cfg)
err = grub.Install(
r.spec.Target,
r.spec.Active.MountPoint,
r.spec.Partitions.State.MountPoint,
r.spec.GrubConf,
r.spec.Tty,
r.spec.Efi,
r.spec.Partitions.State.FilesystemLabel,
)
if err != nil {
return err
}
// Relabel SELinux
// TODO probably relabelling persistent volumes should be an opt in feature, it could
// have undesired effects in case of failures
binds := map[string]string{}
if mnt, _ := utils.IsMounted(r.cfg, r.spec.Partitions.Persistent); mnt {
binds[r.spec.Partitions.Persistent.MountPoint] = cnst.UsrLocalPath
}
if mnt, _ := utils.IsMounted(r.cfg, r.spec.Partitions.OEM); mnt {
binds[r.spec.Partitions.OEM.MountPoint] = cnst.OEMPath
}
err = utils.ChrootedCallback(
r.cfg, r.spec.Active.MountPoint, binds,
func() error { return e.SelinuxRelabel("/", true) },
)
if err != nil {
return err
}
err = r.resetHook(cnst.AfterResetChrootHook, true)
if err != nil {
return err
}
// installation rebrand (only grub for now)
err = e.SetDefaultGrubEntry(
r.spec.Partitions.State.MountPoint,
r.spec.Active.MountPoint,
r.spec.GrubDefEntry,
)
if err != nil {
return err
}
// Unmount active image
err = e.UnmountImage(&r.spec.Active)
if err != nil {
return err
}
// Install Passive
_, err = e.DeployImage(&r.spec.Passive, false)
if err != nil {
return err
}
err = r.resetHook(cnst.AfterResetHook, false)
if err != nil {
return err
}
err = r.updateInstallState(e, cleanup, meta)
if err != nil {
return err
}
// Do not reboot/poweroff on cleanup errors
err = cleanup.Cleanup(err)
if err != nil {
return err
}
return err
}