$ git clone -n https://src.fedoraproject.org/rpms/vlc.git /var/lib/mock/f39-build-2367396-60386/root/chroot_tmpdir/scmroot/vlc
Cloning into '/var/lib/mock/f39-build-2367396-60386/root/chroot_tmpdir/scmroot/vlc'...
$ git fetch origin 9a3013c3494c8e441df4eccb471988a2738961b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vlc
 * [new ref]         9a3013c3494c8e441df4eccb471988a2738961b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a3013c Fix appstream data