$ git clone -n https://src.fedoraproject.org/rpms/vlc.git /var/lib/mock/f42-build-3361267-41426/root/chroot_tmpdir/scmroot/vlc
Cloning into '/var/lib/mock/f42-build-3361267-41426/root/chroot_tmpdir/scmroot/vlc'...
$ git fetch origin e8bf78f81c669e5957f68771fb8e012dfccd3d9e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vlc
 * [new ref]         e8bf78f81c669e5957f68771fb8e012dfccd3d9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8bf78f Rebuilt for aom 3.11.0