Installing an RPM from stdin

[John Dallaway <jld ecoscentric com>]

I need a script to install an RPM package presented on the standard
input. I can _query_ a package as follows:

   cat mypackage.rpm | rpm -qpl /dev/stdin

But attempts to _install_ a package in this way fail silently.

Are there any workarounds (other than saving the stream to a temporary
file)?

John Dallaway