$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer.git /var/lib/mock/f40-build-2727423-73128/root/chroot_tmpdir/scmroot/rust-gstreamer
Cloning into '/var/lib/mock/f40-build-2727423-73128/root/chroot_tmpdir/scmroot/rust-gstreamer'...
$ git fetch origin a3c2bd54cdd4735b223245ef8a5c233cb40b24ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer
 * [new ref]         a3c2bd54cdd4735b223245ef8a5c233cb40b24ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3c2bd5 Update to version 0.22.3; Fixes RHBZ#2263347