$ git clone -n https://src.fedoraproject.org/rpms/rubygem-webrobots.git /var/lib/mock/f45-build-35414-695/root/chroot_tmpdir/scmroot/rubygem-webrobots
Cloning into '/var/lib/mock/f45-build-35414-695/root/chroot_tmpdir/scmroot/rubygem-webrobots'...
$ git fetch origin a83ac8e349742a8a59449b4e8db47cc955aacda0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-webrobots
 * [new ref]         a83ac8e349742a8a59449b4e8db47cc955aacda0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a83ac8e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild