$ git clone -n https://src.fedoraproject.org/rpms/ruby-romkan.git /var/lib/mock/f45-build-34746-691/root/chroot_tmpdir/scmroot/ruby-romkan
Cloning into '/var/lib/mock/f45-build-34746-691/root/chroot_tmpdir/scmroot/ruby-romkan'...
$ git fetch origin 9c56a9eb175f17c932c7a268c9f9d618a9f9afc1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ruby-romkan
 * [new ref]         9c56a9eb175f17c932c7a268c9f9d618a9f9afc1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9c56a9e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild