$ git clone -n https://src.fedoraproject.org/rpms/mediawiki1.35.git /var/lib/mock/f38-build-side-42-init-devel-1073463-29796/root/chroot_tmpdir/scmroot/mediawiki1.35
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1073463-29796/root/chroot_tmpdir/scmroot/mediawiki1.35'...
$ git fetch origin 86686d7055be46bcf8617edfd8d4c8c1ebd51299:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mediawiki1.35
 * [new ref]         86686d7055be46bcf8617edfd8d4c8c1ebd51299 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86686d7 Added the README