OpenWRT installed package list creator

openwrt-list-installed.sh

#!/bin/sh
# Outputs a list of openwrt installed packages, in the same format as the one
# used by sysupgrade to create /etc/backup/installed_packages.txt.
# This can be useful to diff the currently installed packages with the packages
# installed during a upgrade.
#
# Based-off of sysupgrade code:
#   https://github.com/openwrt/openwrt/blob/master/package/base-files/files/sbin/sysupgrade
find_extra='(
    ( -exec test -f /rom/{} ; -exec echo {} rom ; )
    -o ( -exec test -f /overlay/upper/{} ; -exec echo {} overlay ; )
    -o  ( -exec echo {} unknown ; )
)
'
find /usr/lib/opkg/info -name "*.control" $find_extra | sed -e 's,.*/,,;s/\.control /\t/'