$ git clone -n https://src.fedoraproject.org/rpms/rubygem-kramdown.git /var/lib/mock/f45-build-35034-693/root/chroot_tmpdir/scmroot/rubygem-kramdown
Cloning into '/var/lib/mock/f45-build-35034-693/root/chroot_tmpdir/scmroot/rubygem-kramdown'...
$ git fetch origin 26fcc1e8cc9f07656bd3628393abda63409b0bcd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-kramdown
 * [new ref]         26fcc1e8cc9f07656bd3628393abda63409b0bcd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26fcc1e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild