init/upstart/boot-splash.conf

# Copyright 2012 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

description    "Displays an animation while the system is booting"
author         "chromium-os-dev@chromium.org"

# UI should still be able to come up even if we fail.
oom score -100
export fork

# boot-splash depends on udev-trigger-early because frecon does need
# graphics device to be ready to display splash screen and tty (ptmx)
# device to create terminals, it also uses input devices (though they
# can also be hotplugged).

start on stopped udev-trigger-early and started cros_configfs

# If no assets are available to show, assume "embedded".
# If a specific embedded device needs different parameters, see:
#   http://upstart.ubuntu.com/cookbook/#separating-variables-from-the-job
env ASSETLESS_ARGS="--enable-osc --enable-vts --pre-create-vts"

# Script stanzas can only execute one program,
# and that program needs to be frecon.
pre-start script
  # Do not change backlight if the display was already
  # initialized in firmware (brightness is set in firmware).
  if [ "$(cros_config /firmware has-splash-screen)" != "true" ] ||
     ! grep -qsF "active=1" /sys/kernel/debug/dri/0/state; then
    # Set the backlight to 40% of its maximum level.
    BACKLIGHT_DIR=/sys/class/backlight
    if [ -d ${BACKLIGHT_DIR} ] &&
       [ -n "$(find ${BACKLIGHT_DIR} -maxdepth 0 ! -empty)" ]; then
      backlight_tool --set_brightness_percent=40.0 || true
    fi
  fi
end script

script
  BACKGROUND=0xfffefefe
  ARGS=""
  BOOT_IMAGES=""

  if [ "$(cros_config /firmware has-splash-screen)" != "true" ] ||
     ! grep -qsF "active=1" /sys/kernel/debug/dri/0/state; then
    ASSETS=/usr/share/chromeos-assets
    ASSETS_200=${ASSETS}/images_200_percent
    ASSETS_100=${ASSETS}/images_100_percent

    if [ "$(feature_check  --feature_name=FeatureManagementOobeSimon)" -eq "1" ]
    then
      ASSETS_200=${ASSETS}/animated_splash_screen/splash_200_percent
      ASSETS_100=${ASSETS}/animated_splash_screen/splash_100_percent
    fi

    if [ -f "${ASSETS}/splash_background" ]; then
      BACKGROUND=$(cat "${ASSETS}/splash_background")
    fi

    # Use differently-sized images depending on the framebuffer width.
    if [ -e "${ASSETS_200}/boot_splash_frame01.png" ]; then
      ARGS="--frame-interval 25"
      BOOT_IMAGES=""

      for image in "${ASSETS_200}"/boot_splash_frame*.png; do
        BOOT_IMAGES="${BOOT_IMAGES} --image-hires ${image}"
      done
      for image in "${ASSETS_100}"/boot_splash_frame*.png; do
        BOOT_IMAGES="${BOOT_IMAGES} --image ${image}"
      done
    elif [ -d "${ASSETS_100}" ]; then
      ARGS="--frame-interval 25"
      BOOT_IMAGES="${ASSETS_100}"/boot_splash_frame*.png
    else
      ARGS="${ASSETLESS_ARGS}"
    fi
  fi

  if is_developer_end_user; then
    ARGS="${ARGS} --dev-mode --enable-osc --enable-vts --pre-create-vts"
  fi

  # Run as 'frecon' group, to give created files/folders the correct ownership.
  # TODO(b/193068531): Sandbox frecon and run as user:group frecon:frecon.
  minijail0 -g frecon --no-fs-restrictions --no-default-runtime-environment -i \
      -- /sbin/frecon --daemon --clear "${BACKGROUND}" ${ARGS} ${BOOT_IMAGES}
end script