$ git clone -n https://src.fedoraproject.org/rpms/xsnow.git /var/lib/mock/f42-build-3427060-45201/root/chroot_tmpdir/scmroot/xsnow
Cloning into '/var/lib/mock/f42-build-3427060-45201/root/chroot_tmpdir/scmroot/xsnow'...
$ git fetch origin 8a2571030ad013fa4a7207f35fb19d8c4f5cb443:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xsnow
 * [new ref]         8a2571030ad013fa4a7207f35fb19d8c4f5cb443 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a25710 Updated to new upstream release