Bug 196930

As mentioned on fedora-extras-list.

The mock package in Extras currently includes configuration files for building
packages for old (Legacy) distributions. However, most of them need changes due
to the way that the distribution has evolved over the years.

FC2 and older don't include "runuser" and so they need the following line adding
to each of their configs:
config_opts['runuser'] = '/bin/su'

I would like to see a buildsys-build spec file included in the package so that
people can more easily set up their own "groups" repo. The buildsys-build
package needs different dependencies for different distribution releases, as
follows:

* For all Fedora Core distributions before Fedora Core 5, and also Red
Hat Linux 9, an additional package, elfutils, is needed in the default
buildroot. It's needed because redhat-rpm-config turns on the creation
of debuginfo packages, and eu-strip from the elfutils package is needed
for this. In Fedora Core 5, elfutils is a dependency of rpm-build, so it
gets pulled in automatically, but this doesn't happen for earlier
distributions. There is disagreement about where the dependency should
really be (see Bug #111363, Bug #132633, and Bug #155129) so in the
meantime (and certainly for end-of-lifed distributions), it needs to be
a dependency of buildsys-build.

* Building for any Red Hat Linux target older than Red Hat Linux 9
requires file, fileutils, and findutils in the buildroot rather than
coreutils (these are needed for the post-build scripts).

* Red Hat Linux 7 does not include the redhat-rpm-config package, so it
must not be included in the buildroot.

I've attached a patch that illustrates one way of addressing this.

It would be nice if a Red Hat 8 config was supplied too. I realise that Fedora
Legacy doesn't support it but I know some people that use it because the CAD
software they use simply won't run properly on anything newer.

Links to the mock packages on the wiki would be useful to have in the README:
http://fedoraproject.org/wiki/Projects/Mock
http://fedoraproject.org/wiki/Legacy/Mock