$ git clone -n https://src.fedoraproject.org/rpms/vlc.git /var/lib/mock/f40-build-796265-140592/root/chroot_tmpdir/scmroot/vlc
Cloning into '/var/lib/mock/f40-build-796265-140592/root/chroot_tmpdir/scmroot/vlc'...
$ git fetch origin edb9dbcde08183bc947009a8a8758a9cdd8ef7ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vlc
 * [new ref]         edb9dbcde08183bc947009a8a8758a9cdd8ef7ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at edb9dbc Rebuild for libvpx 1.14.x