A user trying to update from openSUSE 12.3 to Tumbleweed runs into an issue
that squid's pretrans script wants to change a user account that does not
exist.

the pretrans script should be a bit more resilient in this case.

During the upgrade, yast shows the error:

Subprocess failed. Error: RPM failed: usermod: group 'squid' does not exist.
error: %pretrans(squid-3.5.10-2.1)

The script


The group is being created in %pre
# we need this group for /usr/sbin/pinger
if [[ -z $(%{_bindir}/getent group %{name} 2>/dev/null) ]]; then
  %{_sbindir}/groupadd -g 31 -r %{name} 2>/dev/null
fi

but %pretrans runs before that, and executes:
# update mode?
if [ "$1" -gt "1" ]; then
  if [ -e %{_sysconfdir}/%{name}.conf -a ! -L %{_sysconfdir}/%{name}.conf -a !
-e %{_sysconfdir}/%{name}/%{name}.conf ]; then
    echo "moving %{_sysconfdir}/%{name}.conf to
%{_sysconfdir}/%{name}/%{name}.conf"
    mv /%{_sysconfdir}/%{name}.conf /%{_sysconfdir}/%{name}/%{name}.conf
  fi
  # default group changed from nogroup to squid
  %{_sbindir}/usermod -g %{name} %{name}
fi