This file is indexed.

/etc/system-image/writable-paths is in lxc-android-config 0.230+16.04.20160328-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# 1st column: Mount point
# 2nd column: Path relative to root of persistent storage (or auto)
# 3rd column: type => persistent|synced|temporary
# 4th column: action => none|transition (transition requires persistent)
# 5th column: mount flags

/android/data                           android-data            persistent  none        none
/etc/NetworkManager/system-connections  auto                    persistent  none        none
/home                                   user-data               persistent  transition  none
/media                                  auto                    temporary   none        defaults
/opt/click.ubuntu.com                   auto                    persistent  transition  none
/tmp                                    none                    temporary   none        defaults
/var/crash                              auto                    persistent  none        none
/var/lib/AccountsService/users          auto                    persistent  none        none
/var/lib/dbus                           auto                    persistent  none        none
/var/lib/extrausers                     auto                    persistent  transition  none
/var/lib/logrotate                      auto                    persistent  none        none
/var/lib/NetworkManager                 auto                    persistent  none        none
/var/lib/ofono                          auto                    persistent  none        none
/var/lib/PackageKit                     auto                    persistent  none        none
/var/lib/bluetooth                      auto                    persistent  none        none
/var/lib/lightdm                        auto                    persistent  none        none
/var/lib/lightdm-data                   auto                    persistent  none        none
/var/lib/sudo                           auto                    temporary   none        defaults,mode=0700
/var/lib/system-image                   auto                    persistent  none        none
/var/lib/upower                         auto                    persistent  none        none
/var/lib/usermetrics                    auto                    persistent  none        none
/var/lib/ubuntu-location-service        auto                    persistent  none        none
/var/log                                auto                    persistent  transition  none
# ufw
/etc/default/ufw                        auto                    persistent  transition  none
/etc/ufw                                auto                    persistent  transition  none
/lib/ufw/user6.rules                    auto                    persistent  transition  none
/lib/ufw/user.rules                     auto                    persistent  transition  none
# apparmor cache is pregenerated in the image builds
/etc/apparmor.d/cache                   auto                    persistent  transition  none
# needed by click-apparmor - use transition since some core apps are
# pre-installed on the image
/var/cache/apparmor                     auto                    synced      none        none
/var/lib/apparmor                       auto                    synced      none        none
# for a writable dconf db used by customization
/custom/etc/dconf                       auto                    persistent  none        none
# ssh
/etc/ssh                                auto                    persistent  transition  none
/etc/init/ssh.override                  auto                    persistent  transition  none
# used for various writable files (timezone, localtime, ...)
/etc/writable                           auto                    synced      none        none
# ureadahead
/var/lib/ureadahead                     auto                    persistent  transition  none
# apport
/var/lib/apport                         auto                    persistent  transition  none
# allow us to disable apport as it slows down image
/etc/default/apport                     auto                    persistent  none        none
# needed for rfkill persistance
/var/lib/rfkill                         auto                    persistent  transition  none
# needed for urfkill persistance
/var/lib/urfkill                        auto                    persistent  transition  none
# needed for usb tethering
/var/lib/misc                           auto                    persistent  transition  none
# whoopsie
/var/lib/whoopsie                       auto                    persistent  transition  none
/etc/init/whoopsie.override             auto                    persistent  transition  none
# needed to persist ntp enabled/disabled
/etc/network/if-up.d                    auto                    persistent  transition  none