$ git clone -n https://github.com/xcp-ng-rpms/ipxe.git /var/lib/mock/v8.1-base-1723-1203/root/chroot_tmpdir/scmroot/ipxe
Cloning into '/var/lib/mock/v8.1-base-1723-1203/root/chroot_tmpdir/scmroot/ipxe'...
$ git reset --hard fe0d1ac450779961cdd7cb4b659560da8d9f8c99
Downloading SOURCES/ipxe-20121005.tar.gz (2.8 MB)
HEAD is now at fe0d1ac Merge branch 'XS-8.1'