$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-gl.git /var/lib/mock/f42-build-side-1-3572308-46757/root/chroot_tmpdir/scmroot/rust-gstreamer-gl
Cloning into '/var/lib/mock/f42-build-side-1-3572308-46757/root/chroot_tmpdir/scmroot/rust-gstreamer-gl'...
$ git fetch origin e77dc6f16f43a06ef800a09c0d4d02361e6c8417:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-gl
 * [new ref]         e77dc6f16f43a06ef800a09c0d4d02361e6c8417 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e77dc6f Update to version 0.23.6; Fixes RHBZ#2365899