$ git clone -n https://src.fedoraproject.org/rpms/xsnow.git /var/lib/mock/f45-build-39127-732/root/chroot_tmpdir/scmroot/xsnow
Cloning into '/var/lib/mock/f45-build-39127-732/root/chroot_tmpdir/scmroot/xsnow'...
$ git fetch origin 5172db95b70250cb008a533c91e06ea71d112d7f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xsnow
 * [new ref]         5172db95b70250cb008a533c91e06ea71d112d7f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5172db9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild