$ git clone -n https://src.fedoraproject.org/rpms/rubygem-minitest4.git /var/lib/mock/f45-build-35083-693/root/chroot_tmpdir/scmroot/rubygem-minitest4
Cloning into '/var/lib/mock/f45-build-35083-693/root/chroot_tmpdir/scmroot/rubygem-minitest4'...
$ git fetch origin 2b3c3988b4dd355e2173a9057342ed351332a40a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-minitest4
 * [new ref]         2b3c3988b4dd355e2173a9057342ed351332a40a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b3c398 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild