Doing a preinstallation check

["Joe Van Dyk" <joevandyk gmail com>]

Hi,

Say I want to run a command before installing an RPM.  If the command
fails, the RPM should not install.  If I was installing multiple RPMs
at the same time and that command inside that RPM failed, none of the
RPMs would install.

Is that an appropriate use of the %preinstall (or is is %pre) section?

Joe