$ git clone -n https://src.fedoraproject.org/rpms/rubygem-prawn-icon.git /var/lib/mock/f45-build-35156-693/root/chroot_tmpdir/scmroot/rubygem-prawn-icon
Cloning into '/var/lib/mock/f45-build-35156-693/root/chroot_tmpdir/scmroot/rubygem-prawn-icon'...
$ git fetch origin 83a23ce86241a399eeeb8610ee2df54a640f43bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-prawn-icon
 * [new ref]         83a23ce86241a399eeeb8610ee2df54a640f43bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83a23ce Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild