Description of problem:
In case of user squid cannot be added during installing RPM, many
things going wrong.

Version-Release number of selected component (if applicable):
squid-2.5.STABLE1-2

How reproducible:
Always

Steps to Reproduce:
1. Let passwd,group,shadow,gshadow in lock state (*.lock)
2. Install squid

    

Actual Results:  Problems, squid claim about user squid doesn't exist
on start



Expected Results:  Catching the fault

Additional info:

Problem is around here:

# rpm -q --scripts squid
preinstall scriptlet (through /bin/sh):
/usr/sbin/useradd -u 23 -d /var/spool/squid -r -s /dev/null squid
>/dev/null 2>&1

-> missing error catching if user cannot be created