$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-video-sys.git /var/lib/mock/f38-build-side-43-rust-devel-1400490-31151/root/chroot_tmpdir/scmroot/rust-gstreamer-video-sys
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1400490-31151/root/chroot_tmpdir/scmroot/rust-gstreamer-video-sys'...
$ git fetch origin 4d4cfc05e4e4a1cdb3a2f05e333fd7d778ad7be3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-video-sys
 * [new ref]         4d4cfc05e4e4a1cdb3a2f05e333fd7d778ad7be3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d4cfc0 Update to 0.21.0