dbus.conf

# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

description     "D-Bus message bus daemon"
author          "chromium-os-dev@chromium.org"

# Stop conditions for this job deliberately omitted:  D-Bus clients
# routinely terminate with crashes when dbus-daemon terminates before
# them.  Ordering process termination with upstart is hard, so we
# simply leave dbus-daemon running to ensure the rest of the system
# can shut down cleanly.
start on starting boot-services
respawn

# Sets up the D-Bus environment.
pre-start script
  mkdir -p /var/run/dbus
  chown messagebus:messagebus /var/run/dbus
  mkdir -p /var/lib/dbus

  #
  # The following ensures that there is a valid machine-id for dbus.  Just
  # running dbus-uuidgen --ensure is not enough if there is an invalid
  # machine-id.  For instance if machine-id is not a 33 byte file
  # dbus-uuidgen will fail without regenerating a UUID.  The operation of
  # generating a new UUID takes 4ms on CortexA9, so the boot performance
  # impact is minimal.
  #
  # Only generate a new id if dbus-uuidgen fails, otherwise a new id is
  # generated every reboot, which confuses code that expects it to remain
  # constant (e.g. PulseAudio).
  #
  if ! dbus-uuidgen --ensure; then
    rm -f /var/lib/dbus/machine-id
    dbus-uuidgen --ensure
  fi
end script

expect fork
exec dbus-daemon --system --fork

# The post-stop script will clean up after d-dbus. It's better to put this
# here rather than in pre-start since post-stop is always guaranteed to run
# while pre-start can exit pre-maturely.
post-stop script
  rm -rf /var/run/dbus
end script