From-scratch CentOS 4.9 Docker image

As-minimal-as-possible CentOS 4.9 image using yum and some chroot magic. The idea of checking in a large, opaque binary file makes me itch, but the Docker model doesn't currently allow for more control over image creation. This is hopefully the only time I'll have to do this…

Ok, this also contains the EPEL repo configs. But it's still pretty minimal.

Even so, it's too big to put into GitHub:

remote: error: GH001: Large files detected.
remote: error: Trace: 12b8141feda3e55a3296427b879875da
remote: error: See http://git.io/iEPt8g for more information.
remote: error: File centos49.tar.xz is 134.86 MB; this exceeds GitHub's file size limit of 100 MB

So, no automated builds.

generating filesystem image

docker run --privileged -i -t -v $PWD:/srv centos:centos6 /srv/build.sh