$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-gl-x11-sys /var/lib/mock/f42-build-3429006-45391/root/chroot_tmpdir/scmroot/rust-gstreamer-gl-x11-sys
Cloning into '/var/lib/mock/f42-build-3429006-45391/root/chroot_tmpdir/scmroot/rust-gstreamer-gl-x11-sys'...
$ git fetch origin 12623689a657c42a306da12f8ca8a6dc4d4a8c8f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-gl-x11-sys
 * [new ref]         12623689a657c42a306da12f8ca8a6dc4d4a8c8f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1262368 Update to version 0.23.5; Fixes RHBZ#2333674