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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2021 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 ctlcmd
import (
"fmt"
"github.com/snapcore/snapd/i18n"
"github.com/snapcore/snapd/overlord/devicestate"
)
var (
shortRebootHelp = i18n.G("Control the reboot behavior of the system")
longRebootHelp = i18n.G(`
The reboot command can used from allowed hooks to control the reboot behavior of the system.
Currently it can only be invoked from gadget install-device during UC20 install mode. After invoking it from install-device with --halt or --poweroff the device will not reboot into run mode after finishing install mode but will instead either halt or power off. From install-device the effect is therefore not immediate but delayed until the end of installation itself.
`)
)
func init() {
addCommand("reboot", shortRebootHelp, longRebootHelp, func() command { return &rebootCommand{} })
}
type rebootCommand struct {
baseCommand
Halt bool `long:"halt"`
Poweroff bool `long:"poweroff"`
}
func (c *rebootCommand) Execute([]string) error {
ctx, err := c.ensureContext()
if err != nil {
return err
}
if ctx.HookName() != "install-device" {
return fmt.Errorf("cannot use reboot command outside of gadget install-device hook")
}
task, ok := ctx.Task()
if !ok {
return fmt.Errorf("internal error: inside gadget install-device hook but no task")
}
if !c.Halt && !c.Poweroff {
return fmt.Errorf("either --halt or --poweroff must be specified")
}
if c.Halt && c.Poweroff {
return fmt.Errorf("cannot specify both --halt and --poweroff")
}
ctx.Lock()
defer ctx.Unlock()
st := ctx.State()
var restartTaskID string
err = task.Get("restart-task", &restartTaskID)
if err != nil {
return fmt.Errorf("internal error: cannot get restart-task following install-device hook: %v", err)
}
restartTask := st.Task(restartTaskID)
if restartTask == nil {
// same error as TaskSnapSetup
return fmt.Errorf("internal error: tasks are being pruned")
}
var op string
if c.Halt {
op = devicestate.RebootHaltOp
} else if c.Poweroff {
op = devicestate.RebootPoweroffOp
}
restartTask.Set("reboot", devicestate.RebootOptions{
Op: op,
})
return nil
}
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