init/upstart/mount-encrypted.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   "Chrome OS post-mount-encrypted cleanup"
author        "chromium-os-dev@chromium.org"

# This job handles delayed copying of the mount-encrypted log file into
# /var/log. Since mount-encrypted forks a filesystem resizing process
# into the background, give it a chance to at least start running before
# copying the log. Waiting until after system-services seems sufficient,
# and additionally does not add any delay to chromeos_startup itself.
start on started system-services

oom score -100

script
  # Copy the log (not through symlinks), and retain permissions but use
  # the default SELinux label for the target. The target should always
  # be removed since we don't want to follow symlinks on the target.
  # Use a trailing slash to require that "log" is a directory.
  #
  # This is done with cp because it's difficult to precisely replicate this
  # operation via tmpfiles.d. While using cp can be somewhat dangerous the
  # use here should be protected from attacks by the fact that it uses -P to
  # avoid following symlinks, and it's copying only a single file between two
  # root-owned directories. This means that subvertiting this operation would
  # require you to already have root access.
  cp -aPZ --remove-destination /run/mount_encrypted/mount-encrypted.log \
      /var/log/ || true  # croslint: disable

  # Dump the log in syslog to preserve mount-encrypted info over reboots.
  logger -t mount-encrypted -f /var/log/mount-encrypted.log || true
end script