ui.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   "Chrome OS user interface"
author        "chromium-os-dev@chromium.org"

# Note, the 'start on' line is modified by the chromeos-factoryinstall
# ebuild.  Please do not change it without also changing that
# reference.
#
# This job's post-stop script depends on cryptohomed being running;
# cryptohomed in turn depends on chapsd and dbus-daemon.  This job's
# stop condition uses a special stop job to keep those processes
# from terminating until after this job has cleaned up.  See the
# pre-shutdown job for more details.
# NB: Respawning is now handled by ui-respawn.conf, as the logic is
# more complex than upstart was designed to handle.
start on started boot-services
stop on starting pre-shutdown

# Enables chrome to renice background tabs (lower priority), and to set the
# priority of realtime threads to real time.
limit nice 20 20
limit rtprio 10 10

# Uncomment line below to output to VT02
#console output

# Directory where Chrome logs are written and prefix of files there.
env CHROME_LOG_DIR=/var/log/chrome
env CHROME_LOG_PREFIX=chrome

# Directory where session manager logs are written and prefix of files there.
env UI_LOG_DIR=/var/log/ui
env UI_LOG_FILE=ui.LATEST

pre-start script
  X_SOCKET_DIR=/tmp/.X11-unix
  X_ICE_DIR=/tmp/.ICE-unix
  mkdir -p $X_SOCKET_DIR $X_ICE_DIR
  chown root:root $X_SOCKET_DIR $X_ICE_DIR
  chmod 1777 $X_SOCKET_DIR $X_ICE_DIR

  # XKB writes keymaps here; otherwise things like Ctrl-Alt-Fx VT switching
  # don't work.
  mkdir -p /var/lib/xkb
  chown xorg:xorg /var/lib/xkb

  # Make sure we we can easily track UI state.
  rm -rf /var/run/state
  mkdir -p /var/run/state

  # Create a directory where the session manager can store a copy of the user
  # policy key, that will be readable by the chrome process as chronos.
  rm -rf /var/run/user_policy
  mkdir -m 0710 -p /var/run/user_policy
  chown root:chronos /var/run/user_policy

  # Create a directory where the chrome process can store a reboot request so
  # that it persists across browser crashes but is always removed on reboot.
  mkdir -m 0700 -p /var/run/chrome
  chown chronos:chronos /var/run/chrome

  # Ensure the existence of the directory in which the whitelist and other
  # Ownership-related state will live.  Yes, it should be owned by root.
  # The permissions are set such that the chronos user can see the content
  # of known files inside whitelist, but not anything else.
  mkdir -m 0710 -p /var/lib/whitelist
  chown root:chronos /var/lib/whitelist

  # Create the directory where external data referenced by policies is cached
  # for device-local accounts. This data is read and written by chronos.
  mkdir -m 0700 -p /var/cache/device_local_account_external_policy_data
  chown chronos:chronos /var/cache/device_local_account_external_policy_data

  # Create the directory where the AppPack extensions are cached.
  # These extensions are read and written by chronos.
  mkdir -m 0700 -p /var/cache/app_pack
  chown chronos:chronos /var/cache/app_pack

  # Create the directory where extensions for device-local accounts are cached.
  # These extensions are read and written by chronos.
  mkdir -m 0700 -p /var/cache/device_local_account_extensions
  chown chronos:chronos /var/cache/device_local_account_extensions

  # Enable us to keep track of the user's chosen TZ.
  # Default to Pacific timezone if we don't have one set
  TIMEZONE_DIR=/var/lib/timezone
  TIMEZONE_FILE=$TIMEZONE_DIR/localtime
  if [ ! -f $TIMEZONE_FILE ]; then
    mkdir -p $TIMEZONE_DIR
    ln -sf /usr/share/zoneinfo/US/Pacific ${TIMEZONE_FILE}
    chown -R chronos:chronos ${TIMEZONE_DIR}
  fi

  mkdir -p $CHROME_LOG_DIR
  chown chronos:chronos $CHROME_LOG_DIR

  mkdir -p $UI_LOG_DIR
  ln -sf ui.$(date +%Y%m%d-%H%M%S) $UI_LOG_DIR/$UI_LOG_FILE

  # Set up cgroups for chrome. We create two task groups, one for at most one
  # foreground renderer and one for all the background renderers and set the
  # background group to a very low priority. We specifically do not set it to
  # the lowest "2" such that other processes like the update-engine can be even
  # lower. The default value is 1024.
  CHROME_CGROUP_DIR=/sys/fs/cgroup/cpu/chrome_renderers
  if [ ! -d $CHROME_CGROUP_DIR ]; then
     mkdir -p ${CHROME_CGROUP_DIR}
     mkdir -p ${CHROME_CGROUP_DIR}/foreground
     mkdir -p ${CHROME_CGROUP_DIR}/background
     echo "10" > ${CHROME_CGROUP_DIR}/background/cpu.shares
     chown -R chronos ${CHROME_CGROUP_DIR}
  fi
end script  # pre-start

exec session_manager_setup.sh >$UI_LOG_DIR/$UI_LOG_FILE 2>&1

post-stop script
  bootstat ui-post-stop
  set +e
  . /sbin/killers

  # Terminate PKCS #11 services.
  cryptohome --action=pkcs11_terminate

  # Terminate any processes with files open on the mount point
  # TODO(wad) parallelize with VFS/PID namespaces.
  kill_with_open_files_on /home/chronos/u-*

  # Make sure everything is going down. No exceptions.
  # The loop is so that clever daemons can't evade the kill by
  # racing us and killing us first; we'll just try over and over
  # until we win the race, and kill with pid -1 is atomic with
  # respect to process creation.
  while ! sudo -u chronos kill -9 -- -1 ; do
    sleep .1
  done

  # Check for still-living chronos processes and log their status.
  ps -u chronos --no-headers -o pid,stat,args |
    logger -i -t "${UPSTART_JOB}-unkillable" -p crit

  bootstat other-processes-terminated

  term_process '^X$'
  bootstat x-terminated

  cryptohome --action=unmount
  bootstat cryptohome-unmounted
end script