postinst 19 lines (14 with data), 386 Bytes
#! /bin/sh
# postinst for upmpdcli
set -e
if [ "$1" = configure ]; then
if ! getent passwd upmpdcli > /dev/null; then
adduser --disabled-password --quiet --system \
--home /nonexistent --no-create-home --shell /bin/false upmpdcli
fi
if ! groups upmpdcli | cut -d' ' -f 3- | grep -q -w audio ; then
usermod -a -G audio upmpdcli
fi
fi
#DEBHELPER#
exit 0