$ git clone -n https://src.fedoraproject.org/forks/hursand/rpms/git-cola.git /var/lib/mock/f41-build-side-1-3128500-39567/root/chroot_tmpdir/scmroot/git-cola
Cloning into '/var/lib/mock/f41-build-side-1-3128500-39567/root/chroot_tmpdir/scmroot/git-cola'...
$ git fetch origin a684f5a93a4762dd177bdcc7adc07a6ea0882d69:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/hursand/rpms/git-cola
 * [new ref]         a684f5a93a4762dd177bdcc7adc07a6ea0882d69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a684f5a Bump version