$ git clone -n https://src.fedoraproject.org/rpms/mediawiki.git /var/lib/mock/f40-build-1967866-25215/root/chroot_tmpdir/scmroot/mediawiki
Cloning into '/var/lib/mock/f40-build-1967866-25215/root/chroot_tmpdir/scmroot/mediawiki'...
$ git fetch origin a75ac4a9ad24daf8435c3f25365b85061ceca91c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mediawiki
 * [new ref]         a75ac4a9ad24daf8435c3f25365b85061ceca91c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a75ac4a Fix RELEASE-NOTES version