$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-gl-sys.git /var/lib/mock/f42-build-side-1-3585384-46904/root/chroot_tmpdir/scmroot/rust-gstreamer-gl-sys
Cloning into '/var/lib/mock/f42-build-side-1-3585384-46904/root/chroot_tmpdir/scmroot/rust-gstreamer-gl-sys'...
$ git fetch origin d9584684209524d0b02ebdc640b6fc4e9244db7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-gl-sys
 * [new ref]         d9584684209524d0b02ebdc640b6fc4e9244db7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d958468 Update to version 0.23.6; Fixes RHBZ#2365901