PREIN

/bin/sh

if ! getent group squid >/dev/null 2>&1; then
  /usr/sbin/groupadd -g 23 squid
fi

if ! getent passwd squid >/dev/null 2>&1 ; then
  /usr/sbin/useradd -g 23 -u 23 -d /var/spool/squid -r -s /sbin/nologin squid >/dev/null 2>&1 || exit 1 
fi

for i in /var/log/squid /var/spool/squid ; do
        if [ -d $i ] ; then
                for adir in `find $i -maxdepth 0 \! -user squid`; do
                        chown -R squid:squid $adir
                done
        fi
done

exit 0

PREUN

/bin/sh

if [ $1 = 0 ] ; then
        service squid stop >/dev/null 2>&1
        rm -f /var/log/squid/*
        /sbin/chkconfig --del squid
fi

POSTIN

/bin/sh

/sbin/chkconfig --add squid

POSTUN

/bin/sh

if [ "$1" -ge "1" ] ; then
        service squid condrestart >/dev/null 2>&1
fi

Triggers

samba-common

/bin/sh

if ! getent group wbpriv >/dev/null 2>&1 ; then
  /usr/sbin/groupadd -g 88 wbpriv >/dev/null 2>&1 || :
fi
/usr/sbin/usermod -a -G wbpriv squid >/dev/null 2>&1 || \
    chgrp squid /var/cache/samba/winbindd_privileged >/dev/null 2>&1 || :