Run dbus-uuidgen on system startup (again).

src/scripts/customize_rootfs.sh

 #!/bin/bash
 
 # Copyright (c) 2009 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.
 
 # Script to customize the root file system after packages have been installed.
 #
 # NOTE: This script should be called by build_image.sh. Do not run this
 # on your own unless you know what you are doing.
@@ skipping 220 matching lines @@
 sudo rm -rf "${ROOT_FS_DIR}/var/lib/xkb"
 sudo ln -s /var/cache "${ROOT_FS_DIR}/var/lib/xkb"
 
 # This is needed so that devicekit-disks has a place to
 # put its sql lite database. Since we do not need to
 # retain this information across boots, we are just
 # putting it in /var/tmp
 sudo rm -rf "${ROOT_FS_DIR}/var/lib/DeviceKit-disks"
 sudo ln -s /var/tmp "${ROOT_FS_DIR}/var/lib/DeviceKit-disks"
 
+# dbus-uuidgen writes machine-id to /var/lib/dbus.
+sudo rm -f "${ROOT_FS_DIR}/var/lib/dbus/machine-id"
+sudo ln -s /var/cache/machine-id "${ROOT_FS_DIR}/var/lib/dbus/machine-id"
+
 # Remove pam-mount's default entry in common-auth and common-session
 sudo sed -i 's/^\(.*pam_mount.so.*\)/#\1/g' "${ROOT_FS_DIR}"/etc/pam.d/common-*
 
 # Clear the network settings.  This must be done last, since it prevents
 # any subsequent steps from accessing the network.
 cat <<EOF | sudo dd of="${ROOT_FS_DIR}/etc/network/interfaces"
 auto lo
 iface lo inet loopback
 EOF
 
 cat <<EOF | sudo dd of="${ROOT_FS_DIR}/etc/resolv.conf"
 # Use the connman dns proxy.
 nameserver 127.0.0.1
 EOF
 sudo chmod a-wx "${ROOT_FS_DIR}/etc/resolv.conf"