$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-video-sys /var/lib/mock/f42-build-3429027-45391/root/chroot_tmpdir/scmroot/rust-gstreamer-video-sys
Cloning into '/var/lib/mock/f42-build-3429027-45391/root/chroot_tmpdir/scmroot/rust-gstreamer-video-sys'...
$ git fetch origin cc020e6a1340d0fc416526161ffc8b7c376afa25:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-video-sys
 * [new ref]         cc020e6a1340d0fc416526161ffc8b7c376afa25 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc020e6 Update to version 0.23.5; Fixes RHBZ#2333679