$ git clone -n https://src.fedoraproject.org/rpms/rubygem-minitest5.git /var/lib/mock/f45-build-35084-693/root/chroot_tmpdir/scmroot/rubygem-minitest5
Cloning into '/var/lib/mock/f45-build-35084-693/root/chroot_tmpdir/scmroot/rubygem-minitest5'...
$ git fetch origin c20ff21e0a33782f731187d9cc456478c60e9049:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-minitest5
 * [new ref]         c20ff21e0a33782f731187d9cc456478c60e9049 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c20ff21 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild