$ git clone -n https://src.fedoraproject.org/rpms/libvlcpp.git /var/lib/mock/f45-build-17229-497/root/chroot_tmpdir/scmroot/libvlcpp
Cloning into '/var/lib/mock/f45-build-17229-497/root/chroot_tmpdir/scmroot/libvlcpp'...
$ git fetch origin 57888218499735bedfdac325a7587f9ea7a8a881:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libvlcpp
 * [new ref]         57888218499735bedfdac325a7587f9ea7a8a881 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5788821 update to 3.0.0 (resolves rhbz#2495868)