/
firstboot.go
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/
firstboot.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2020 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 (
"errors"
"fmt"
"sort"
"github.com/snapcore/snapd/asserts"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/i18n"
"github.com/snapcore/snapd/overlord/assertstate"
"github.com/snapcore/snapd/overlord/devicestate/internal"
"github.com/snapcore/snapd/overlord/snapstate"
"github.com/snapcore/snapd/overlord/state"
"github.com/snapcore/snapd/release"
"github.com/snapcore/snapd/seed"
"github.com/snapcore/snapd/snap"
"github.com/snapcore/snapd/timings"
)
var errNothingToDo = errors.New("nothing to do")
func installSeedSnap(st *state.State, sn *seed.Snap, flags snapstate.Flags) (*state.TaskSet, *snap.Info, error) {
if sn.Required {
flags.Required = true
}
if sn.Classic {
flags.Classic = true
}
if sn.DevMode {
flags.DevMode = true
}
return snapstate.InstallPath(st, sn.SideInfo, sn.Path, "", sn.Channel, flags)
}
func criticalTaskEdges(ts *state.TaskSet) (beginEdge, beforeHooksEdge, hooksEdge *state.Task, err error) {
// we expect all three edges, or none (the latter is the case with config tasksets).
beginEdge, err = ts.Edge(snapstate.BeginEdge)
if err != nil {
return nil, nil, nil, nil
}
beforeHooksEdge, err = ts.Edge(snapstate.BeforeHooksEdge)
if err != nil {
return nil, nil, nil, err
}
hooksEdge, err = ts.Edge(snapstate.HooksEdge)
if err != nil {
return nil, nil, nil, err
}
return beginEdge, beforeHooksEdge, hooksEdge, nil
}
func markSeededTask(st *state.State) *state.Task {
return st.NewTask("mark-seeded", i18n.G("Mark system seeded"))
}
func trivialSeeding(st *state.State) []*state.TaskSet {
// give the internal core config a chance to run (even if core is
// not used at all we put system configuration there)
configTs := snapstate.ConfigureSnap(st, "core", 0)
markSeeded := markSeededTask(st)
markSeeded.WaitAll(configTs)
return []*state.TaskSet{configTs, state.NewTaskSet(markSeeded)}
}
type populateStateFromSeedOptions struct {
Label string
Mode string
Preseed bool
}
func populateStateFromSeedImpl(st *state.State, opts *populateStateFromSeedOptions, tm timings.Measurer) ([]*state.TaskSet, error) {
mode := "run"
sysLabel := ""
preseed := false
if opts != nil {
if opts.Mode != "" {
mode = opts.Mode
}
sysLabel = opts.Label
preseed = opts.Preseed
}
// check that the state is empty
var seeded bool
err := st.Get("seeded", &seeded)
if err != nil && err != state.ErrNoState {
return nil, err
}
if seeded {
return nil, fmt.Errorf("cannot populate state: already seeded")
}
deviceSeed, err := seed.Open(dirs.SnapSeedDir, sysLabel)
if err != nil {
return nil, err
}
var model *asserts.Model
// ack all initial assertions
timings.Run(tm, "import-assertions", "import assertions from seed", func(nested timings.Measurer) {
model, err = importAssertionsFromSeed(st, deviceSeed)
})
if err != nil && err != errNothingToDo {
return nil, err
}
if err == errNothingToDo {
return trivialSeeding(st), nil
}
err = deviceSeed.LoadMeta(tm)
if release.OnClassic && err == seed.ErrNoMeta {
if preseed {
return nil, fmt.Errorf("no snaps to preseed")
}
// on classic it is ok to not seed any snaps
return trivialSeeding(st), nil
}
if err != nil {
return nil, err
}
essentialSeedSnaps := deviceSeed.EssentialSnaps()
seedSnaps, err := deviceSeed.ModeSnaps(mode)
if err != nil {
return nil, err
}
tsAll := []*state.TaskSet{}
configTss := []*state.TaskSet{}
var lastBeforeHooksTask *state.Task
var chainTs func(all []*state.TaskSet, ts *state.TaskSet) []*state.TaskSet
var preseedDoneTask *state.Task
if preseed {
preseedDoneTask = st.NewTask("mark-preseeded", i18n.G("Mark system pre-seeded"))
}
chainTsPreseeding := func(all []*state.TaskSet, ts *state.TaskSet) []*state.TaskSet {
// mark-preseeded task needs to be inserted between preliminary setup and hook tasks
beginTask, beforeHooksTask, hooksTask, err := criticalTaskEdges(ts)
if err != nil {
// XXX: internal error?
panic(err)
}
// we either have all edges or none
if beginTask != nil {
// hooks must wait for mark-preseeded
hooksTask.WaitFor(preseedDoneTask)
if n := len(all); n > 0 {
// the first hook of the snap waits for all tasks of previous snap
hooksTask.WaitAll(all[n-1])
}
if lastBeforeHooksTask != nil {
beginTask.WaitFor(lastBeforeHooksTask)
}
preseedDoneTask.WaitFor(beforeHooksTask)
lastBeforeHooksTask = beforeHooksTask
} else {
n := len(all)
// no edges: it is a configure snap taskset for core/gadget/kernel
if n != 0 {
ts.WaitAll(all[n-1])
}
}
return append(all, ts)
}
chainTsFullSeeding := func(all []*state.TaskSet, ts *state.TaskSet) []*state.TaskSet {
n := len(all)
if n != 0 {
ts.WaitAll(all[n-1])
}
return append(all, ts)
}
if preseed {
chainTs = chainTsPreseeding
} else {
chainTs = chainTsFullSeeding
}
chainSorted := func(infos []*snap.Info, infoToTs map[*snap.Info]*state.TaskSet) {
sort.Stable(snap.ByType(infos))
for _, info := range infos {
ts := infoToTs[info]
tsAll = chainTs(tsAll, ts)
}
}
// collected snap infos
infos := make([]*snap.Info, 0, len(essentialSeedSnaps)+len(seedSnaps))
infoToTs := make(map[*snap.Info]*state.TaskSet, len(essentialSeedSnaps))
if len(essentialSeedSnaps) != 0 {
// we *always* configure "core" here even if bases are used
// for booting. "core" is where the system config lives.
configTss = chainTs(configTss, snapstate.ConfigureSnap(st, "core", snapstate.UseConfigDefaults))
}
for _, seedSnap := range essentialSeedSnaps {
flags := snapstate.Flags{
SkipConfigure: true,
// for dangerous models, allow all devmode snaps
// XXX: eventually we may need to allow specific snaps to be devmode for
// non-dangerous models, we can do that here since that information will
// probably be in the model assertion which we have here
ApplySnapDevMode: model.Grade() == asserts.ModelDangerous,
}
ts, info, err := installSeedSnap(st, seedSnap, flags)
if err != nil {
return nil, err
}
if info.Type() == snap.TypeKernel || info.Type() == snap.TypeGadget {
configTs := snapstate.ConfigureSnap(st, info.SnapName(), snapstate.UseConfigDefaults)
// wait for the previous configTss
configTss = chainTs(configTss, configTs)
}
infos = append(infos, info)
infoToTs[info] = ts
}
// now add/chain the tasksets in the right order based on essential
// snap types
chainSorted(infos, infoToTs)
// chain together configuring core, kernel, and gadget after
// installing them so that defaults are availabble from gadget
if len(configTss) > 0 {
if preseed {
configTss[0].WaitFor(preseedDoneTask)
}
configTss[0].WaitAll(tsAll[len(tsAll)-1])
tsAll = append(tsAll, configTss...)
}
// ensure we install in the right order
infoToTs = make(map[*snap.Info]*state.TaskSet, len(seedSnaps))
for _, seedSnap := range seedSnaps {
flags := snapstate.Flags{
// for dangerous models, allow all devmode snaps
// XXX: eventually we may need to allow specific snaps to be devmode for
// non-dangerous models, we can do that here since that information will
// probably be in the model assertion which we have here
ApplySnapDevMode: model.Grade() == asserts.ModelDangerous,
}
ts, info, err := installSeedSnap(st, seedSnap, flags)
if err != nil {
return nil, err
}
infos = append(infos, info)
infoToTs[info] = ts
}
// validate that all snaps have bases
errs := snap.ValidateBasesAndProviders(infos)
if errs != nil {
// only report the first error encountered
return nil, errs[0]
}
// now add/chain the tasksets in the right order, note that we
// only have tasksets that we did not already seeded
chainSorted(infos[len(essentialSeedSnaps):], infoToTs)
if len(tsAll) == 0 {
return nil, fmt.Errorf("cannot proceed, no snaps to seed")
}
// ts is the taskset of the last snap
ts := tsAll[len(tsAll)-1]
endTs := state.NewTaskSet()
markSeeded := markSeededTask(st)
if preseed {
endTs.AddTask(preseedDoneTask)
markSeeded.WaitFor(preseedDoneTask)
}
whatSeeds := &seededSystem{
System: sysLabel,
Model: model.Model(),
BrandID: model.BrandID(),
Revision: model.Revision(),
Timestamp: model.Timestamp(),
}
markSeeded.Set("seed-system", whatSeeds)
// mark-seeded waits for the taskset of last snap
markSeeded.WaitAll(ts)
endTs.AddTask(markSeeded)
tsAll = append(tsAll, endTs)
return tsAll, nil
}
func importAssertionsFromSeed(st *state.State, deviceSeed seed.Seed) (*asserts.Model, error) {
// TODO: use some kind of context fo Device/SetDevice?
device, err := internal.Device(st)
if err != nil {
return nil, err
}
// collect and
// set device,model from the model assertion
commitTo := func(batch *asserts.Batch) error {
return assertstate.AddBatch(st, batch, nil)
}
err = deviceSeed.LoadAssertions(assertstate.DB(st), commitTo)
if err == seed.ErrNoAssertions && release.OnClassic {
// on classic seeding is optional
// set the fallback model
err := setClassicFallbackModel(st, device)
if err != nil {
return nil, err
}
return nil, errNothingToDo
}
if err != nil {
return nil, err
}
modelAssertion := deviceSeed.Model()
classicModel := modelAssertion.Classic()
if release.OnClassic != classicModel {
var msg string
if classicModel {
msg = "cannot seed an all-snaps system with a classic model"
} else {
msg = "cannot seed a classic system with an all-snaps model"
}
return nil, fmt.Errorf(msg)
}
// set device,model from the model assertion
if err := setDeviceFromModelAssertion(st, device, modelAssertion); err != nil {
return nil, err
}
return modelAssertion, nil
}