$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-gl-x11 /var/lib/mock/f42-build-3429009-45391/root/chroot_tmpdir/scmroot/rust-gstreamer-gl-x11
Cloning into '/var/lib/mock/f42-build-3429009-45391/root/chroot_tmpdir/scmroot/rust-gstreamer-gl-x11'...
$ git fetch origin 858a11138d08e0a24bf2f8bac1d00f62e11b1b92:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-gl-x11
 * [new ref]         858a11138d08e0a24bf2f8bac1d00f62e11b1b92 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 858a111 Update to version 0.23.5; Fixes RHBZ#2333673