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handlers_gadget.go
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handlers_gadget.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016-2017 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 devicestate
import (
"fmt"
"os"
"path/filepath"
"gopkg.in/tomb.v2"
"github.com/snapcore/snapd/asserts"
"github.com/snapcore/snapd/boot"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/gadget"
"github.com/snapcore/snapd/logger"
"github.com/snapcore/snapd/overlord/snapstate"
"github.com/snapcore/snapd/overlord/state"
"github.com/snapcore/snapd/release"
"github.com/snapcore/snapd/snap"
)
func makeRollbackDir(name string) (string, error) {
rollbackDir := filepath.Join(dirs.SnapRollbackDir, name)
if err := os.MkdirAll(rollbackDir, 0750); err != nil {
return "", err
}
return rollbackDir, nil
}
func currentGadgetInfo(st *state.State, curDeviceCtx snapstate.DeviceContext) (*gadget.GadgetData, error) {
currentInfo, err := snapstate.GadgetInfo(st, curDeviceCtx)
if err != nil && err != state.ErrNoState {
return nil, err
}
if currentInfo == nil {
// no current yet
return nil, nil
}
ci, err := gadgetDataFromInfo(currentInfo, curDeviceCtx.Model())
if err != nil {
return nil, fmt.Errorf("cannot read current gadget snap details: %v", err)
}
return ci, nil
}
func pendingGadgetInfo(snapsup *snapstate.SnapSetup, pendingDeviceCtx snapstate.DeviceContext) (*gadget.GadgetData, error) {
info, err := snap.ReadInfo(snapsup.InstanceName(), snapsup.SideInfo)
if err != nil {
return nil, fmt.Errorf("cannot read candidate gadget snap details: %v", err)
}
gi, err := gadgetDataFromInfo(info, pendingDeviceCtx.Model())
if err != nil {
return nil, fmt.Errorf("cannot read candidate snap gadget metadata: %v", err)
}
return gi, nil
}
var (
gadgetUpdate = gadget.Update
)
func (m *DeviceManager) doUpdateGadgetAssets(t *state.Task, _ *tomb.Tomb) error {
if release.OnClassic {
return fmt.Errorf("cannot run update gadget assets task on a classic system")
}
st := t.State()
st.Lock()
defer st.Unlock()
snapsup, err := snapstate.TaskSnapSetup(t)
if err != nil {
return err
}
remodelCtx, err := DeviceCtx(st, t, nil)
if err != nil {
return err
}
isRemodel := remodelCtx.ForRemodeling()
groundDeviceCtx := remodelCtx.GroundContext()
model := groundDeviceCtx.Model()
if isRemodel {
model = remodelCtx.Model()
}
// be extra paranoid when checking we are installing the right gadget
var updateData *gadget.GadgetData
switch snapsup.Type {
case snap.TypeGadget:
expectedGadgetSnap := model.Gadget()
if snapsup.InstanceName() != expectedGadgetSnap {
return fmt.Errorf("cannot apply gadget assets update from non-model gadget snap %q, expected %q snap",
snapsup.InstanceName(), expectedGadgetSnap)
}
updateData, err = pendingGadgetInfo(snapsup, remodelCtx)
if err != nil {
return err
}
case snap.TypeKernel:
expectedKernelSnap := model.Kernel()
if snapsup.InstanceName() != expectedKernelSnap {
return fmt.Errorf("cannot apply kernel assets update from non-model kernel snap %q, expected %q snap",
snapsup.InstanceName(), expectedKernelSnap)
}
// now calculate the "update" data, it's the same gadget but
// argumented from a different kernel
updateData, err = currentGadgetInfo(t.State(), groundDeviceCtx)
if err != nil {
return err
}
default:
return fmt.Errorf("internal errror: doUpdateGadgetAssets called with snap type %v", snapsup.Type)
}
currentData, err := currentGadgetInfo(t.State(), groundDeviceCtx)
if err != nil {
return err
}
if currentData == nil {
// no updates during first boot & seeding
return nil
}
// add kernel directories
currentKernelInfo, err := snapstate.CurrentInfo(st, groundDeviceCtx.Model().Kernel())
// XXX: switch to the normal `if err != nil { return err }` pattern
// here once all tests are updated and have a kernel
if err == nil {
currentData.KernelRootDir = currentKernelInfo.MountDir()
updateData.KernelRootDir = currentKernelInfo.MountDir()
}
// if this is a gadget update triggered by an updated kernel we
// need to ensure "updateData.KernelRootDir" points to the new kernel
if snapsup.Type == snap.TypeKernel {
updateKernelInfo, err := snap.ReadInfo(snapsup.InstanceName(), snapsup.SideInfo)
if err != nil {
return fmt.Errorf("cannot read candidate kernel snap details: %v", err)
}
updateData.KernelRootDir = updateKernelInfo.MountDir()
}
snapRollbackDir, err := makeRollbackDir(fmt.Sprintf("%v_%v", snapsup.InstanceName(), snapsup.SideInfo.Revision))
if err != nil {
return fmt.Errorf("cannot prepare update rollback directory: %v", err)
}
var updatePolicy gadget.UpdatePolicyFunc = nil
// Even with a remodel a kernel refresh only updates the kernel assets
if snapsup.Type == snap.TypeKernel {
updatePolicy = gadget.KernelUpdatePolicy
} else if isRemodel {
// use the remodel policy which triggers an update of all
// structures
updatePolicy = gadget.RemodelUpdatePolicy
}
var updateObserver gadget.ContentUpdateObserver
observeTrustedBootAssets, err := boot.TrustedAssetsUpdateObserverForModel(model, updateData.RootDir)
if err != nil && err != boot.ErrObserverNotApplicable {
return fmt.Errorf("cannot setup asset update observer: %v", err)
}
if err == nil {
updateObserver = observeTrustedBootAssets
}
// do not release the state lock, the update observer may attempt to
// modify modeenv inside, which implicitly is guarded by the state lock;
// on top of that we do not expect the update to be moving large amounts
// of data
err = gadgetUpdate(*currentData, *updateData, snapRollbackDir, updatePolicy, updateObserver)
if err != nil {
if err == gadget.ErrNoUpdate {
// no update needed
t.Logf("No gadget assets update needed")
return nil
}
return err
}
t.SetStatus(state.DoneStatus)
if err := os.RemoveAll(snapRollbackDir); err != nil && !os.IsNotExist(err) {
logger.Noticef("failed to remove gadget update rollback directory %q: %v", snapRollbackDir, err)
}
// TODO: consider having the option to do this early via recovery in
// core20, have fallback code as well there
st.RequestRestart(state.RestartSystem)
return nil
}
func (m *DeviceManager) updateGadgetCommandLine(t *state.Task, st *state.State, isUndo bool) (updated bool, err error) {
snapsup, err := snapstate.TaskSnapSetup(t)
if err != nil {
return false, err
}
devCtx, err := DeviceCtx(st, t, nil)
if err != nil {
return false, err
}
if devCtx.Model().Grade() == asserts.ModelGradeUnset {
// pre UC20 system, do nothing
return false, nil
}
var gadgetData *gadget.GadgetData
if !isUndo {
// when updating, command line comes from the new gadget
gadgetData, err = pendingGadgetInfo(snapsup, devCtx)
} else {
// but when undoing, we use the current gadget which should have
// been restored
currentGadgetData, err := currentGadgetInfo(st, devCtx)
if err != nil {
return false, err
}
gadgetData = currentGadgetData
}
updated, err = boot.UpdateCommandLineForGadgetComponent(devCtx, gadgetData.RootDir)
if err != nil {
return false, fmt.Errorf("cannot update kernel command line from gadget: %v", err)
}
return updated, nil
}
func (m *DeviceManager) doUpdateGadgetCommandLine(t *state.Task, _ *tomb.Tomb) error {
if release.OnClassic {
return fmt.Errorf("internal error: cannot run update gadget kernel command line task on a classic system")
}
st := t.State()
st.Lock()
defer st.Unlock()
var seeded bool
err := st.Get("seeded", &seeded)
if err != nil && err != state.ErrNoState {
return err
}
if !seeded {
// do nothing during first boot & seeding
return nil
}
const isUndo = false
updated, err := m.updateGadgetCommandLine(t, st, isUndo)
if err != nil {
return err
}
if !updated {
logger.Debugf("no kernel command line update from gadget")
return nil
}
t.Logf("Updated kernel command line")
t.SetStatus(state.DoneStatus)
// TODO: consider optimization to avoid double reboot when the gadget
// snap carries an update to the gadget assets and a change in the
// kernel command line
// kernel command line was updated, request a reboot to make it effective
st.RequestRestart(state.RestartSystem)
return nil
}
func (m *DeviceManager) undoUpdateGadgetCommandLine(t *state.Task, _ *tomb.Tomb) error {
if release.OnClassic {
return fmt.Errorf("internal error: cannot run update gadget kernel command line task on a classic system")
}
st := t.State()
st.Lock()
defer st.Unlock()
var seeded bool
err := st.Get("seeded", &seeded)
if err != nil && err != state.ErrNoState {
return err
}
if !seeded {
// do nothing during first boot & seeding
return nil
}
const isUndo = true
updated, err := m.updateGadgetCommandLine(t, st, isUndo)
if err != nil {
return err
}
if !updated {
logger.Debugf("no kernel command line update to undo")
return nil
}
t.Logf("Reverted kernel command line change")
t.SetStatus(state.UndoneStatus)
// kernel command line was updated, request a reboot to make it effective
st.RequestRestart(state.RestartSystem)
return nil
}