#! /bin/bash

[ -f /etc/subuid ] || exit
[ -f /etc/subgid ] || exit

users=$(getent group ipeusers | awk 'BEGIN { FS=":" } { print $4 }' | sed -e 's/,/\n/')
subuid=$(cat /etc/subuid | awk 'BEGIN { FS=":" } { print $1 }')
subgid=$(cat /etc/subgid | awk 'BEGIN { FS=":" } { print $1 }')

subuid=$(echo -e "$users\n$subuid\n$subuid" | sort | uniq -u)
subgid=$(echo -e "$users\n$subgid\n$subgid" | sort | uniq -u)

for user in $subuid; do
    grep -qxF "$user" /etc/subuid || sed -i'' -e "\$a$user:100000:65536" /etc/subuid
done

for user in $subgid; do
    grep -qxF "$user" /etc/subgid || sed -i'' -e "\$a$user:100000:65536" /etc/subgid
done