bash script to trick rpm

I need to install an app into CentOS that is checking to see if it is RedHat.

The way it does its checks is via rpm;

vendorstr=`rpm -q --queryformat '%{vendor}' rpm 2` vendorstr2=`echo $vendorstr cut -f2 -d ":" cut -f1 -d","` LINUXDIST2=`echo $vendorstr cut -f1 -d" "tr 'A-Z' 'a-z'`

this returns the following three variables on CentOS

CentOSpackage 2 is not installed CentOSpackage 2 is not installed centospackage

and on RedHat RHEL 3

Red Hat, Inc.package 2 is not installed Red Hat red

The only variable I need to worry about is the first, the rest are derived from its result. So...

The above variables are set in a script which is called from an installer. It in turns expands packages on the fly. I cannot modify the original script, its embeded in the binary installer.

So, I need to trick rpm (or something else..). One way I was thinking was to write a small shell script that stated "if rpm is called with rpm -q --queryformat then return "Red Hat, Inc." I'm not sure how I would do this. I can rename the rpm binary to rpm.orig and call the script rpm, if the call doesn't fit the if then the original rpm is called.

Given the above scenario does anyone have any ideas on how I may do this?

Thanks for an and all help.

Cheers.

xscousr