$ git clone -n https://src.fedoraproject.org/rpms/mediawiki-lastmodified.git /var/lib/mock/f45-build-18213-511/root/chroot_tmpdir/scmroot/mediawiki-lastmodified
Cloning into '/var/lib/mock/f45-build-18213-511/root/chroot_tmpdir/scmroot/mediawiki-lastmodified'...
$ git fetch origin b5b83c7fff75977326d563364ecacbae75300563:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mediawiki-lastmodified
 * [new ref]         b5b83c7fff75977326d563364ecacbae75300563 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5b83c7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild