installer/chromeos-postinst

#!/bin/sh

# 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.

# This script is called after an AutoUpdate or USB install. This script is a
# simple wrapper to convert from the hardcoded command line to the new
# executable command line.

# NOTE: This script is called by installers like `chromeos-install` or
# `update_engine` from inside the mounted rootfs of the target image. So it is
# perfectly fine to modify this script without caring about backward/forward
# compatibility. But it can never be migrated to a non-shell script because it
# is being called by the original installer and that can break things badly.

INSTALL_ROOT=$(dirname "$0")

# Set up the mount points userland needs/expects.
MOUNTS="/proc /dev /sys /tmp /run /var /mnt/stateful_partition"

# Include chromeos-config, which is a submount of /run
MOUNTS="${MOUNTS} /run/chromeos-config/v1"

# Include efivarfs, which is a submount of /sys, if it's present.
# This will only exist on efi systems with the appropriate kernel module. On
# those systems this is needed for efi boot entry management.
EFIVARS="/sys/firmware/efi/efivars"
if [ -d "${EFIVARS}" ]; then
  MOUNTS="${MOUNTS} ${EFIVARS}"
fi

cleanup() {
  local d
  for d in ${MOUNTS}; do
    umount -lf "./${d}" || :
  done
}

main() {
  cd "${INSTALL_ROOT}" || exit 1

  if [ "${INSTALL_ROOT}" != "/" ]; then
    echo "Setting up mounts for chroot postinst"
    trap cleanup EXIT

    local d
    for d in ${MOUNTS}; do
      mount -n --bind "${d}" "./${d}"
      mount --make-slave "./${d}"
    done
  fi

  local install_dev="$1"
  shift
  chroot . /usr/bin/cros_installer --type="postinst" \
         --install_dev="${install_dev}" --install_dir="/" "$@"
}
main "$@"