[novikov@novikov novikov]$ rpm -q samba-common
samba-common-3.0.10-alt0.M24.1

[novikov@novikov novikov]$ rpm -q --scripts samba-common
preinstall scriptlet (through /bin/sh):
if [ $1 -gt 1 ] ; then
    smbstopped=$(/sbin/service smb status|grep stopped)
    wnbstopped=$(/sbin/service winbind status|grep stopped)
    [ -n "$smbstopped" ] || /sbin/service smb stop
    [ -n "$wnbstopped" ] || /sbin/service winbind stop
    [ -n "$smbstopped" ] || touch /var/lib/samba/smbstopped
    [ -n "$wnbstopped" ] || touch /var/lib/samba/wnbstopped
fi
/usr/sbin/groupadd -r -f winbind &>/dev/null
^^^^^^^^^^^^^^^^^^