$ git clone -n https://src.fedoraproject.org/rpms/rust-gst-plugin-fmp4.git /var/lib/mock/f42-build-side-1-3586547-46923/root/chroot_tmpdir/scmroot/rust-gst-plugin-fmp4
Cloning into '/var/lib/mock/f42-build-side-1-3586547-46923/root/chroot_tmpdir/scmroot/rust-gst-plugin-fmp4'...
$ git fetch origin 87d4754afd91c371f1c9d5ba20e034960d96c130:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gst-plugin-fmp4
 * [new ref]         87d4754afd91c371f1c9d5ba20e034960d96c130 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87d4754 Update to 0.13.6 (rhbz#2365928)