$ git clone -n https://src.fedoraproject.org/rpms/miracle-wm.git /var/lib/mock/f42-build-side-1-3586903-46926/root/chroot_tmpdir/scmroot/miracle-wm
Cloning into '/var/lib/mock/f42-build-side-1-3586903-46926/root/chroot_tmpdir/scmroot/miracle-wm'...
$ git fetch origin 63a3b64bfc6e77e6732c4a89b503b69710ba9b97:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/miracle-wm
 * [new ref]         63a3b64bfc6e77e6732c4a89b503b69710ba9b97 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63a3b64 Update to 0.6.1