$ git clone -n https://src.fedoraproject.org/rpms/rubygem-prawn-svg.git /var/lib/mock/f45-build-35151-693/root/chroot_tmpdir/scmroot/rubygem-prawn-svg
Cloning into '/var/lib/mock/f45-build-35151-693/root/chroot_tmpdir/scmroot/rubygem-prawn-svg'...
$ git fetch origin 99487ebc8bb600499692673fe422469010d69a2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-prawn-svg
 * [new ref]         99487ebc8bb600499692673fe422469010d69a2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99487eb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild