$ git clone -n https://src.fedoraproject.org/rpms/xsnow.git /var/lib/mock/f39-build-1595589-38327/root/chroot_tmpdir/scmroot/xsnow
Cloning into '/var/lib/mock/f39-build-1595589-38327/root/chroot_tmpdir/scmroot/xsnow'...
$ git fetch origin 371dd467ad2eed8f651132caad1aa14793c733e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xsnow
 * [new ref]         371dd467ad2eed8f651132caad1aa14793c733e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 371dd46 Updated to new upstream release