#!/bin/sh
# generate a sysusers.d(5) file from Debian's static master passwd/group files
set -eu

echo '# generated from /usr/share/base-passwd/{passwd,group}.master'

# only take groups whose name+gid != the corresponding user in passwd.master
export IFS=:
while read name _ id _; do
    if ! grep -q "^$name:\*:$id:$id:" /usr/share/base-passwd/passwd.master; then
        printf "g %-10s %-5s -\n" $name $id
    fi
done < /usr/share/base-passwd/group.master

echo

# treat "nobody:nogroup" specially: same ID, but different name, so prevent creating a "nobody" group
awk -F:  '{ i = ($3 == $4 && $4 != 65534) ? $3 : $3":"$4; printf("u %-10s %-7s - %-20s %s\n", $1,i,$6,$7) }'  < /usr/share/base-passwd/passwd.master