/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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | # 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
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