$ git clone -n https://src.fedoraproject.org/rpms/rubygem-RedCloth.git /var/lib/mock/f45-build-34734-691/root/chroot_tmpdir/scmroot/rubygem-RedCloth
Cloning into '/var/lib/mock/f45-build-34734-691/root/chroot_tmpdir/scmroot/rubygem-RedCloth'...
$ git fetch origin df6db27752e596348eaacae97f11ba663d95b1da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-RedCloth
 * [new ref]         df6db27752e596348eaacae97f11ba663d95b1da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df6db27 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild