/etc/system-image/writable-paths is in ubuntu-core-config 0.6.40.
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
#
# See writable-paths(5) for full details.
# --------------------------------------------------------------------
/home user-data persistent transition none
/snap auto persistent transition none
/tmp none temporary none defaults
/mnt none temporary none defaults
/var/crash auto persistent none none
/var/lib/AccountsService/users auto persistent none none
# snap data
/var/snap auto persistent transition none
# cloud-init
/var/lib/bluetooth auto persistent none none
/var/lib/cloud auto persistent none none
/var/lib/colord auto persistent transition none
/var/lib/dbus auto persistent none none
/var/lib/dhcp auto persistent none none
/var/lib/logrotate 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/lightdm auto persistent none none
/var/lib/lightdm-data auto persistent none none
/var/log auto persistent transition none
/var/lib/NetworkManager auto temporary none defaults
/var/lib/usermetrics auto persistent none none
/var/lib/ubuntu-location-service auto persistent none none
# for various clouds like GCE
/etc/sysctl.d 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 not pregenerated in the image builds
/etc/apparmor.d/cache auto persistent none none
# needed by apparmor - use transition since some core apps are
# pre-installed on the image
/var/cache/apparmor auto persistent transition none
/var/lib/apparmor auto persistent transition none
/var/lib/whoopsie auto persistent transition none
# required by update-initramfs
/var/tmp auto persistent transition 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
# required by update-initramfs
/var/lib/initramfs-tools auto persistent transition none
# systemd
/etc/systemd/system auto persistent transition none
# needed for usb tethering
/var/lib/misc auto persistent transition none
# walinuxagent
/var/lib/waagent auto persistent transition none
# ssh keys
/root auto persistent transition none
# passwordless sudo
/etc/sudoers.d auto persistent transition none
/etc/hosts auto persistent transition none
/var/lib/extrausers auto persistent transition none
/etc/network/interfaces.d auto persistent transition none
# needed to persist ntp enabled/disabled
/etc/network/if-up.d auto persistent transition none
/etc/NetworkManager/system-connections auto persistent none none
# snappy security policy, etc
/var/lib/snapd auto persistent transition none
# udev
/etc/udev/rules.d auto persistent transition none
# random seed
/var/lib/systemd/random-seed auto persistent transition none
# rfkill dir
/var/lib/systemd/rfkill auto persistent transition none
# dbus bus policy
/etc/dbus-1/system.d auto persistent transition none
/etc/modprobe.d/ auto persistent transition none
/etc/ppp auto persistent transition none
/var/lib/tpm auto persistent transition none
/var/lib/opencryptoki auto persistent transition none
/etc/modules-load.d auto persistent transition none
# LP: 1562784
/etc/systemd/network auto persistent transition none
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