$ git clone -n https://src.fedoraproject.org/rpms/xsnow.git /var/lib/mock/f40-build-795491-140206/root/chroot_tmpdir/scmroot/xsnow
Cloning into '/var/lib/mock/f40-build-795491-140206/root/chroot_tmpdir/scmroot/xsnow'...
$ git fetch origin 527023280daf27e107b9458965bf8f673923eefa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xsnow
 * [new ref]         527023280daf27e107b9458965bf8f673923eefa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5270232 Updated to new upstream release