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If you think what we're doing to tweak topdir is weird, be assured that
we're at least in good company:
http://mailman.cs.uchicago.edu/pipermail/swig/2000-August/001736.html
The problem is as follows: RPM really wants to use directories in
/usr/src/redhat/, which means that the build would probably require
privileges and exclusive access to this part of the machine. This is
more or less exactly was one would consider a bad idea.
In order to redirect topdir to a local directory, one can simply
change the spec file to contain %define _topdir /local/directory
This works great and everything, but it has the nasty little drawback
that any SRPM generated with this spec file will also expect to find
things in general, and the TAR file with the source in particular, at
this location. Since, in our case, the location is created after
unpacking the TAR bundle, we have a neat catch-22 problem.
So the backup solution is to override _topdir outside of the spec
file. "Maximum RPM" claims that it is sufficient to put a line saying
topdir: /local/directory into a new rpmrc file to and use this rpmrc
file, e.g. with --rcfile. Unfortunately, recent versions of RPM don't
seem to support this option anymore.
So this work-around uses a macro definitions file instead. This file
can override topdir (the internal variable is called "_topdir"), and
it can in turn be sourced from an rpmrc using the macrofiles
directive.
The only thing left to do is to make sure that all other macro files
are also sourced (they contain several vital macros), because
"macrofiles" resets the list of macro files on each use.
Since there is no construct like foo=$foo:newstuff for rpmrc files,
we have to grab the original definition and insert it into our own
rpmrc file.
Carpe diem.
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