$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-gl-x11-sys.git /var/lib/mock/f39-build-1547198-36709/root/chroot_tmpdir/scmroot/rust-gstreamer-gl-x11-sys
Cloning into '/var/lib/mock/f39-build-1547198-36709/root/chroot_tmpdir/scmroot/rust-gstreamer-gl-x11-sys'...
$ git fetch origin f1c3a64e531039c5d491ce3642cea66ab69dddbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-gl-x11-sys
 * [new ref]         f1c3a64e531039c5d491ce3642cea66ab69dddbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1c3a64 Update to version 0.21.1; Fixes RHBZ#2245490