/
hooks.go
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/
hooks.go
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/*
* Copyright (C) 2017-2022 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 hookstate
import (
"fmt"
"regexp"
"time"
"github.com/snapcore/snapd/cmd/snaplock"
"github.com/snapcore/snapd/cmd/snaplock/runinhibit"
"github.com/snapcore/snapd/features"
"github.com/snapcore/snapd/i18n"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/overlord/configstate/config"
"github.com/snapcore/snapd/overlord/snapstate"
"github.com/snapcore/snapd/overlord/state"
)
func init() {
snapstate.SetupInstallHook = SetupInstallHook
snapstate.SetupPreRefreshHook = SetupPreRefreshHook
snapstate.SetupPostRefreshHook = SetupPostRefreshHook
snapstate.SetupRemoveHook = SetupRemoveHook
snapstate.SetupGateAutoRefreshHook = SetupGateAutoRefreshHook
}
func SetupInstallHook(st *state.State, snapName string) *state.Task {
hooksup := &HookSetup{
Snap: snapName,
Hook: "install",
Optional: true,
}
summary := fmt.Sprintf(i18n.G("Run install hook of %q snap if present"), hooksup.Snap)
task := HookTask(st, summary, hooksup, nil)
return task
}
func SetupPostRefreshHook(st *state.State, snapName string) *state.Task {
hooksup := &HookSetup{
Snap: snapName,
Hook: "post-refresh",
Optional: true,
}
summary := fmt.Sprintf(i18n.G("Run post-refresh hook of %q snap if present"), hooksup.Snap)
return HookTask(st, summary, hooksup, nil)
}
func SetupPreRefreshHook(st *state.State, snapName string) *state.Task {
hooksup := &HookSetup{
Snap: snapName,
Hook: "pre-refresh",
Optional: true,
}
summary := fmt.Sprintf(i18n.G("Run pre-refresh hook of %q snap if present"), hooksup.Snap)
task := HookTask(st, summary, hooksup, nil)
return task
}
type gateAutoRefreshHookHandler struct {
context *Context
refreshAppAwareness bool
}
func (h *gateAutoRefreshHookHandler) Before() error {
st := h.context.State()
st.Lock()
defer st.Unlock()
tr := config.NewTransaction(st)
experimentalRefreshAppAwareness, err := features.Flag(tr, features.RefreshAppAwareness)
if err != nil && !config.IsNoOption(err) {
return err
}
if !experimentalRefreshAppAwareness {
return nil
}
h.refreshAppAwareness = true
snapName := h.context.InstanceName()
snapInfo, err := snapstate.CurrentInfo(st, snapName)
if err != nil {
return err
}
snapRev := snapInfo.SnapRevision()
// obtain snap lock before manipulating runinhibit lock.
lock, err := snaplock.OpenLock(snapName)
if err != nil {
return err
}
if err := lock.Lock(); err != nil {
return err
}
defer lock.Unlock()
inhibitInfo := runinhibit.InhibitInfo{Previous: snapRev}
if err := runinhibit.LockWithHint(snapName, runinhibit.HintInhibitedGateRefresh, inhibitInfo); err != nil {
return err
}
return nil
}
func (h *gateAutoRefreshHookHandler) Done() (err error) {
ctx := h.context
st := ctx.State()
ctx.Lock()
defer ctx.Unlock()
snapName := ctx.InstanceName()
var action snapstate.GateAutoRefreshAction
a := ctx.Cached("action")
// obtain snap lock before manipulating runinhibit lock.
var lock *osutil.FileLock
if h.refreshAppAwareness {
lock, err = snaplock.OpenLock(snapName)
if err != nil {
return err
}
if err := lock.Lock(); err != nil {
return err
}
defer lock.Unlock()
}
// default behavior if action is not set
if a == nil {
// action is not set if the gate-auto-refresh hook exits 0 without
// invoking --hold/--proceed; this means proceed (except for respecting
// refresh inhibit).
if h.refreshAppAwareness {
if err := runinhibit.Unlock(snapName); err != nil {
return fmt.Errorf("cannot unlock inhibit lock for snap %s: %v", snapName, err)
}
}
return snapstate.ProceedWithRefresh(st, snapName, nil)
} else {
var ok bool
action, ok = a.(snapstate.GateAutoRefreshAction)
if !ok {
return fmt.Errorf("internal error: unexpected action type %T", a)
}
}
// action is set if snapctl refresh --hold/--proceed was called from the hook.
switch action {
case snapstate.GateAutoRefreshHold:
// for action=hold the ctlcmd calls HoldRefresh; only unlock runinhibit.
if h.refreshAppAwareness {
if err := runinhibit.Unlock(snapName); err != nil {
return fmt.Errorf("cannot unlock inhibit lock of snap %s: %v", snapName, err)
}
}
case snapstate.GateAutoRefreshProceed:
// for action=proceed the ctlcmd doesn't call ProceedWithRefresh
// immediately, do it here.
if err := snapstate.ProceedWithRefresh(st, snapName, nil); err != nil {
return err
}
if h.refreshAppAwareness {
// we have HintInhibitedGateRefresh lock already when running the hook, change
// it to HintInhibitedForRefresh.
// Also let's reuse inhibit info that was saved in Before().
_, inhibitInfo, err := runinhibit.IsLocked(snapName)
if err != nil {
return err
}
if err := runinhibit.LockWithHint(snapName, runinhibit.HintInhibitedForRefresh, inhibitInfo); err != nil {
return fmt.Errorf("cannot set inhibit lock for snap %s: %v", snapName, err)
}
}
default:
return fmt.Errorf("internal error: unexpected action %v", action)
}
return nil
}
// Error handles gate-auto-refresh hook failure; it assumes hold.
func (h *gateAutoRefreshHookHandler) Error(hookErr error) (ignoreHookErr bool, err error) {
ctx := h.context
st := h.context.State()
ctx.Lock()
defer ctx.Unlock()
snapName := h.context.InstanceName()
var lock *osutil.FileLock
// the refresh is going to be held, release runinhibit lock.
if h.refreshAppAwareness {
// obtain snap lock before manipulating runinhibit lock.
lock, err = snaplock.OpenLock(snapName)
if err != nil {
return false, err
}
if err := lock.Lock(); err != nil {
return false, err
}
defer lock.Unlock()
if err := runinhibit.Unlock(snapName); err != nil {
return false, fmt.Errorf("cannot release inhibit lock of snap %s: %v", snapName, err)
}
}
if a := ctx.Cached("action"); a != nil {
action, ok := a.(snapstate.GateAutoRefreshAction)
if !ok {
return false, fmt.Errorf("internal error: unexpected action type %T", a)
}
// nothing to do if the hook already requested hold.
if action == snapstate.GateAutoRefreshHold {
ctx.Errorf("ignoring hook error: %v", hookErr)
// tell hook manager to ignore hook error.
return true, nil
}
}
// the hook didn't request --hold, or it was --proceed. since the hook
// errored out, assume hold.
affecting, err := snapstate.AffectingSnapsForAffectedByRefreshCandidates(st, snapName)
if err != nil {
// becomes error of the handler
return false, err
}
// no duration specified, use maximum allowed for this gating snap.
var holdDuration time.Duration
if _, err := snapstate.HoldRefresh(st, snapstate.HoldAutoRefresh, snapName, holdDuration, affecting...); err != nil {
// log the original hook error as we either ignore it or error out from
// this handler, in both cases hookErr won't be logged by hook manager.
h.context.Errorf("error: %v (while handling previous hook error: %v)", err, hookErr)
if _, ok := err.(*snapstate.HoldError); ok {
// TODO: consider delaying for another hour.
return true, nil
}
// anything other than HoldError becomes an error of the handler.
return false, err
}
// TODO: consider assigning a special health state for the snap.
ctx.Errorf("ignoring hook error: %v", hookErr)
// tell hook manager to ignore hook error.
return true, nil
}
func NewGateAutoRefreshHookHandler(context *Context) *gateAutoRefreshHookHandler {
return &gateAutoRefreshHookHandler{
context: context,
}
}
func SetupGateAutoRefreshHook(st *state.State, snapName string) *state.Task {
hookSup := &HookSetup{
Snap: snapName,
Hook: "gate-auto-refresh",
Optional: true,
}
summary := fmt.Sprintf(i18n.G("Run hook %s of snap %q"), hookSup.Hook, hookSup.Snap)
task := HookTask(st, summary, hookSup, nil)
return task
}
type snapHookHandler struct {
}
func (h *snapHookHandler) Before() error {
return nil
}
func (h *snapHookHandler) Done() error {
return nil
}
func (h *snapHookHandler) Error(err error) (bool, error) {
return false, nil
}
func SetupRemoveHook(st *state.State, snapName string) *state.Task {
hooksup := &HookSetup{
Snap: snapName,
Hook: "remove",
Optional: true,
IgnoreError: true,
}
summary := fmt.Sprintf(i18n.G("Run remove hook of %q snap if present"), hooksup.Snap)
task := HookTask(st, summary, hooksup, nil)
return task
}
func setupHooks(hookMgr *HookManager) {
handlerGenerator := func(context *Context) Handler {
return &snapHookHandler{}
}
gateAutoRefreshHandlerGenerator := func(context *Context) Handler {
return NewGateAutoRefreshHookHandler(context)
}
hookMgr.Register(regexp.MustCompile("^install$"), handlerGenerator)
hookMgr.Register(regexp.MustCompile("^post-refresh$"), handlerGenerator)
hookMgr.Register(regexp.MustCompile("^pre-refresh$"), handlerGenerator)
hookMgr.Register(regexp.MustCompile("^remove$"), handlerGenerator)
hookMgr.Register(regexp.MustCompile("^gate-auto-refresh$"), gateAutoRefreshHandlerGenerator)
}