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o/devicestate, tests/nested/manual/component-recovery-system: support…
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… creating recovery systems with components from the store
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@andrewphelpsj
andrewphelpsj committed Dec 20, 2024
1 parent a5a78c7 commit 78fc1a6
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Showing 11 changed files with 1,335 additions and 108 deletions.
204 changes: 137 additions & 67 deletions overlord/devicestate/devicestate.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,7 @@ var (
snapstateSwitch = snapstate.Switch
snapstateUpdatePathWithDeviceContext = snapstate.UpdatePathWithDeviceContext
snapstateDownload = snapstate.Download
snapstateDownloadComponents = snapstate.DownloadComponents
)

// findModel returns the device model assertion.
Expand Down Expand Up @@ -1150,7 +1151,9 @@ func remodelTasks(ctx context.Context, st *state.State, current, new *asserts.Mo
}
// we don't pass in the list of local snaps here because they are
// already represented by snapSetupTasks
createRecoveryTasks, err := createRecoverySystemTasks(st, label, snapSetupTasks, CreateRecoverySystemOptions{

// TODO:COMPS - pass in the list of component setup tasks
createRecoveryTasks, err := createRecoverySystemTasks(st, label, snapSetupTasks, nil, CreateRecoverySystemOptions{
TestSystem: true,
})
if err != nil {
Expand Down Expand Up @@ -1498,10 +1501,14 @@ type recoverySystemSetup struct {
// SnapSetupTasks is a list of task IDs that carry snap setup information.
// Tasks could come from a remodel, or from downloading snaps that were
// required by a validation set.
SnapSetupTasks []string `json:"snap-setup-tasks"`
SnapSetupTasks []string `json:"snap-setup-tasks,omitempty"`
// LocalSnaps is a list of snaps that should be used to create the recovery
// system.
LocalSnaps []LocalSnap `json:"local-snaps,omitempty"`
// ComponentSetupTasks is a list of task IDs that carry component setup
// information. Tasks could come from a remodel, or from downloading
// components that were required by a validation set.
ComponentSetupTasks []string `json:"component-setup-tasks,omitempty"`
// TestSystem is set to true if the new recovery system should
// not be verified by rebooting into the new system. Once the system is
// created, it will immediately be considered a valid recovery system.
Expand Down Expand Up @@ -1553,7 +1560,7 @@ func removeRecoverySystemTasks(st *state.State, label string) (*state.TaskSet, e
return state.NewTaskSet(remove), nil
}

func createRecoverySystemTasks(st *state.State, label string, snapSetupTasks []string, opts CreateRecoverySystemOptions) (*state.TaskSet, error) {
func createRecoverySystemTasks(st *state.State, label string, snapSetupTasks, compSetupTasks []string, opts CreateRecoverySystemOptions) (*state.TaskSet, error) {
// precondition check, the directory should not exist yet
systemDirectory := filepath.Join(boot.InitramfsUbuntuSeedDir, "systems", label)
exists, _, err := osutil.DirExists(systemDirectory)
Expand All @@ -1570,10 +1577,11 @@ func createRecoverySystemTasks(st *state.State, label string, snapSetupTasks []s
Label: label,
Directory: systemDirectory,
// IDs of the tasks carrying snap-setup
SnapSetupTasks: snapSetupTasks,
LocalSnaps: opts.LocalSnaps,
TestSystem: opts.TestSystem,
MarkDefault: opts.MarkDefault,
SnapSetupTasks: snapSetupTasks,
ComponentSetupTasks: compSetupTasks,
LocalSnaps: opts.LocalSnaps,
TestSystem: opts.TestSystem,
MarkDefault: opts.MarkDefault,
})

ts := state.NewTaskSet(create)
Expand Down Expand Up @@ -1705,11 +1713,6 @@ func CreateRecoverySystem(st *state.State, label string, opts CreateRecoverySyst
return nil, err
}

revisions, err := valsets.Revisions()
if err != nil {
return nil, err
}

// TODO: this restriction should be lifted eventually (in the case that we
// have a dangerous model), and we should fall back to using snap names in
// places that IDs are used
Expand All @@ -1722,72 +1725,122 @@ func CreateRecoverySystem(st *state.State, label string, opts CreateRecoverySyst
return nil, err
}

// TODO: check that all snaps and components that are required by validation
// sets are also required in the model. this matches the behavior of
// remodeling.

tracker := snap.NewSelfContainedSetPrereqTracker()

validRevision := func(current snap.Revision, constraints snapasserts.PresenceConstraint) bool {
return constraints.Revision.Unset() || current == constraints.Revision
}

var downloadTSS []*state.TaskSet
for _, sn := range model.AllSnaps() {
rev := revisions[sn.Name]
constraints, err := valsets.Presence(sn)
if err != nil {
return nil, err
}

needsInstall, err := snapNeedsInstall(st, sn.Name, rev)
installed, currentRevision, err := installedSnapRevision(st, sn.Name)
if err != nil {
return nil, err
}

if !needsInstall {
info, err := snapstate.CurrentInfo(st, sn.Name)
if err != nil {
return nil, err
}
tracker.Add(info)
// if the snap is installed, then we must either download it from the
// store, have it provided locally, or it must be installed at the
// correct revision.
//
// TODO: in the case that the snap is installed at the wrong revision,
// we must provide it either from the store or locally. this is because
// doCreateRecoverySystem will install any optional snaps that are
// present on the system.
required := constraints.Presence == asserts.PresenceRequired || sn.Presence == "required" || installed
if !required {
continue
}

if sn.Presence != "required" {
pres, err := valsets.Presence(sn)
compsToDownload := make([]string, 0, len(sn.Components))
for name, comp := range sn.Components {
compInstalled, currentCompRevision, err := installedComponentRevision(st, sn.Name, name)
if err != nil {
return nil, err
}

// snap isn't already installed, and it isn't required by model or
// any validation sets, so we should skip it
if pres.Presence != asserts.PresenceRequired {
compConstraints := constraints.Component(name)

required := comp.Presence == "required" || constraints.Component(name).Presence == asserts.PresenceRequired || compInstalled

// same deal as with snaps, same TODO as well
if !required {
continue
}

switch {
case compInstalled && validRevision(currentCompRevision, compConstraints):
// nothing to do!
case opts.Offline:
// TODO: verify that we have the offline component
default:
compsToDownload = append(compsToDownload, name)
}
}

if opts.Offline {
info, err := offlineSnapInfo(sn, rev, opts)
switch {
case installed && validRevision(currentRevision, constraints.PresenceConstraint):
info, err := snapstate.CurrentInfo(st, sn.Name)
if err != nil {
return nil, err
}
tracker.Add(info)
case opts.Offline:
info, err := offlineSnapInfo(sn, constraints.Revision, opts)
if err != nil {
return nil, err
}
tracker.Add(info)
default:
// TODO: this respects the passed in validation sets, but does not
// currently respect refresh-control style of constraining snap
// revisions.
//
// TODO: download somewhere other than the default snap blob dir.
ts, _, err := snapstateDownload(context.TODO(), st, sn.Name, compsToDownload, dirs.SnapBlobDir, snapstate.RevisionOptions{
Channel: sn.DefaultChannel,
ValidationSets: valsets,
}, snapstate.Options{
PrereqTracker: tracker,
})
if err != nil {
return nil, err
}
downloadTSS = append(downloadTSS, ts)

// if we go in this branch, then we'll handle downloading snaps and
// components at the same time.
continue
}

// TODO: this respects the passed in validation sets, but does not
// currently respect refresh-control style of constraining snap
// revisions.
//
// TODO: download somewhere other than the default snap blob dir.
ts, info, err := snapstateDownload(context.TODO(), st, sn.Name, nil, dirs.SnapBlobDir, snapstate.RevisionOptions{
Channel: sn.DefaultChannel,
Revision: rev,
ValidationSets: valsets,
}, snapstate.Options{})
if err != nil {
return nil, err
if len(compsToDownload) > 0 {
// TODO: download somewhere other than the default snap blob dir.
ts, err := snapstateDownloadComponents(context.TODO(), st, sn.Name, compsToDownload, dirs.SnapBlobDir, snapstate.RevisionOptions{
Channel: sn.DefaultChannel,
ValidationSets: valsets,
}, snapstate.Options{
PrereqTracker: tracker,
})
if err != nil {
return nil, err
}
downloadTSS = append(downloadTSS, ts)
}

tracker.Add(info)
downloadTSS = append(downloadTSS, ts)
}

warnings, errs := tracker.Check()
for _, w := range warnings {
logger.Noticef("create recovery system prerequisites warning: %v", w)
}

// TODO: use function from other branch
if len(errs) > 0 {
var builder strings.Builder
builder.WriteString("cannot create recovery system from model that is not self-contained:")
Expand All @@ -1800,16 +1853,13 @@ func CreateRecoverySystem(st *state.State, label string, opts CreateRecoverySyst
return nil, errors.New(builder.String())
}

var snapsupTaskIDs []string
if len(downloadTSS) > 0 {
snapsupTaskIDs, err = extractSnapSetupTaskIDs(downloadTSS)
if err != nil {
return nil, err
}
snapsupTaskIDs, compsupTaskIDs, err := extractSnapSetupTaskIDs(downloadTSS)
if err != nil {
return nil, err
}

chg = st.NewChange("create-recovery-system", fmt.Sprintf("Create new recovery system with label %q", label))
createTS, err := createRecoverySystemTasks(st, label, snapsupTaskIDs, opts)
createTS, err := createRecoverySystemTasks(st, label, snapsupTaskIDs, compsupTaskIDs, opts)
if err != nil {
return nil, err
}
Expand Down Expand Up @@ -1870,39 +1920,59 @@ func offlineSnapInfo(sn *asserts.ModelSnap, rev snap.Revision, opts CreateRecove
return snap.ReadInfoFromSnapFile(s, localSnap.SideInfo)
}

func snapNeedsInstall(st *state.State, name string, rev snap.Revision) (bool, error) {
info, err := snapstate.CurrentInfo(st, name)
if err != nil {
if isNotInstalled(err) {
return true, nil
func installedSnapRevision(st *state.State, name string) (bool, snap.Revision, error) {
var snapst snapstate.SnapState
if err := snapstate.Get(st, name, &snapst); err != nil {
if errors.Is(err, state.ErrNoState) {
return false, snap.Revision{}, nil
}
return false, err
return false, snap.Revision{}, err
}
return true, snapst.Current, nil
}

if rev.Unset() {
return false, nil
func installedComponentRevision(st *state.State, snapName, compName string) (bool, snap.Revision, error) {
var snapst snapstate.SnapState
if err := snapstate.Get(st, snapName, &snapst); err != nil {
if errors.Is(err, state.ErrNoState) {
return false, snap.Revision{}, nil
}
return false, snap.Revision{}, err
}

return rev != info.Revision, nil
for _, comp := range snapst.CurrentComponentSideInfos() {
if comp.Component.ComponentName == compName {
return true, comp.Revision, nil
}
}

return false, snap.Revision{}, nil
}

func extractSnapSetupTaskIDs(tss []*state.TaskSet) ([]string, error) {
var taskIDs []string
func extractSnapSetupTaskIDs(tss []*state.TaskSet) (snapsupTaskIDs, compsupTaskIDs []string, err error) {
for _, ts := range tss {
found := false
var snapsupTask *state.Task
for _, t := range ts.Tasks() {
if t.Has("snap-setup") {
taskIDs = append(taskIDs, t.ID())
found = true
snapsupTask = t
break
}
}

if !found {
return nil, errors.New("internal error: snap setup task missing from task set")
if snapsupTask == nil {
return nil, nil, errors.New("internal error: snap setup task missing from task set")
}

snapsupTaskIDs = append(snapsupTaskIDs, snapsupTask.ID())

var compsups []string
if err := snapsupTask.Get("component-setup-tasks", &compsups); err != nil && !errors.Is(err, state.ErrNoState) {
return nil, nil, err
}

compsupTaskIDs = append(compsupTaskIDs, compsups...)
}
return taskIDs, nil
return snapsupTaskIDs, compsupTaskIDs, nil
}

// OptionalContainers is used to define the snaps and components that are
Expand Down
14 changes: 6 additions & 8 deletions overlord/devicestate/devicestate_remodel_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -4282,10 +4282,9 @@ func (s *deviceMgrRemodelSuite) TestRemodelUC20EssentialSnapsTrackingDifferentCh
err = tCreateRecovery.Get("recovery-system-setup", &systemSetupData)
c.Assert(err, IsNil)
c.Assert(systemSetupData, DeepEquals, map[string]interface{}{
"label": expectedLabel,
"directory": filepath.Join(boot.InitramfsUbuntuSeedDir, "systems", expectedLabel),
"snap-setup-tasks": nil,
"test-system": true,
"label": expectedLabel,
"directory": filepath.Join(boot.InitramfsUbuntuSeedDir, "systems", expectedLabel),
"test-system": true,
})
}

Expand Down Expand Up @@ -4623,10 +4622,9 @@ func (s *deviceMgrRemodelSuite) TestRemodelUC20BaseNoDownloadSimpleChannelSwitch
err = tCreateRecovery.Get("recovery-system-setup", &systemSetupData)
c.Assert(err, IsNil)
c.Assert(systemSetupData, DeepEquals, map[string]interface{}{
"label": expectedLabel,
"directory": filepath.Join(boot.InitramfsUbuntuSeedDir, "systems", expectedLabel),
"snap-setup-tasks": nil,
"test-system": true,
"label": expectedLabel,
"directory": filepath.Join(boot.InitramfsUbuntuSeedDir, "systems", expectedLabel),
"test-system": true,
})
}

Expand Down
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