$ git clone -n https://src.fedoraproject.org/rpms/gnubg.git /var/lib/mock/f40-build-790045-136250/root/chroot_tmpdir/scmroot/gnubg
Cloning into '/var/lib/mock/f40-build-790045-136250/root/chroot_tmpdir/scmroot/gnubg'...
$ git fetch origin ab6e817950e3871dc4f47619db414d47db6001cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnubg
 * [new ref]         ab6e817950e3871dc4f47619db414d47db6001cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab6e817 1.08.002