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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016-2018 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 udev
import (
"fmt"
"os/exec"
)
// reloadRules runs three commands that reload udev rule database.
//
// The commands are: udevadm control --reload-rules
// udevadm trigger --subsystem-nomatch=input
// udevadm settle --timeout=3
// and optionally trigger other subsystems as defined in the interfaces. Eg:
// udevadm trigger --subsystem-match=input
// udevadm trigger --property-match=ID_INPUT_JOYSTICK=1
func (b *Backend) reloadRules(subsystemTriggers []string) error {
if b.preseed {
return nil
}
output, err := exec.Command("udevadm", "control", "--reload-rules").CombinedOutput()
if err != nil {
return fmt.Errorf("cannot reload udev rules: %s\nudev output:\n%s", err, string(output))
}
// By default, trigger for all events except the input subsystem since
// it can cause noticeable blocked input on, for example, classic
// desktop.
output, err = exec.Command("udevadm", "trigger", "--subsystem-nomatch=input").CombinedOutput()
if err != nil {
return fmt.Errorf("cannot run udev triggers: %s\nudev output:\n%s", err, string(output))
}
// FIXME: track if also should trigger the joystick property if it
// wasn't already since we are not able to detect interfaces that are
// removed and set subsystemTriggers correctly. When we can, remove
// this. Allows joysticks to be removed from the device cgroup on
// interface disconnect.
inputJoystickTriggered := false
for _, subsystem := range subsystemTriggers {
if subsystem == "input/joystick" {
// If one of the interfaces said it uses the input
// subsystem for joysticks, then trigger the joystick
// events in a way that is specific to joysticks to not
// block other inputs.
output, err = exec.Command("udevadm", "trigger", "--property-match=ID_INPUT_JOYSTICK=1").CombinedOutput()
if err != nil {
return fmt.Errorf("cannot run udev triggers for joysticks: %s\nudev output:\n%s", err, string(output))
}
inputJoystickTriggered = true
} else if subsystem == "input/key" {
// If one of the interfaces said it uses the input
// subsystem for input keys, then trigger the keys
// events in a way that is specific to input keys
// to not block other inputs.
output, err = exec.Command("udevadm", "trigger", "--property-match=ID_INPUT_KEY=1", "--property-match=ID_INPUT_KEYBOARD!=1").CombinedOutput()
if err != nil {
return fmt.Errorf("cannot run udev triggers for keys: %s\nudev output:\n%s", err, string(output))
}
} else if subsystem != "" {
// If one of the interfaces said it uses a subsystem,
// then do it too.
output, err = exec.Command("udevadm", "trigger", "--subsystem-match="+subsystem).CombinedOutput()
if err != nil {
return fmt.Errorf("cannot run udev triggers for %s subsystem: %s\nudev output:\n%s", subsystem, err, string(output))
}
if subsystem == "input" {
inputJoystickTriggered = true
}
}
}
// FIXME: if not already triggered, trigger the joystick property if it
// wasn't already since we are not able to detect interfaces that are
// removed and set subsystemTriggers correctly. When we can, remove
// this. Allows joysticks to be removed from the device cgroup on
// interface disconnect.
if !inputJoystickTriggered {
output, err = exec.Command("udevadm", "trigger", "--property-match=ID_INPUT_JOYSTICK=1").CombinedOutput()
if err != nil {
return fmt.Errorf("cannot run udev triggers for joysticks: %s\nudev output:\n%s", err, string(output))
}
}
// give our triggered events a chance to be handled before exiting.
// Ignore errors since we don't want to error on still pending events.
_ = exec.Command("udevadm", "settle", "--timeout=10").Run()
return nil
}
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