$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-video.git /var/lib/mock/f42-build-side-1-3587631-46933/root/chroot_tmpdir/scmroot/rust-gstreamer-video
Cloning into '/var/lib/mock/f42-build-side-1-3587631-46933/root/chroot_tmpdir/scmroot/rust-gstreamer-video'...
$ git fetch origin f6439e8a04e12d39d03b2b285a8cc60b4e0db750:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-video
 * [new ref]         f6439e8a04e12d39d03b2b285a8cc60b4e0db750 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6439e8 Update to version 0.23.6; Fixes RHBZ#2365905