$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer.git /var/lib/mock/f41-build-side-110780-59086111-6570987/root/chroot_tmpdir/scmroot/rust-gstreamer
Cloning into '/var/lib/mock/f41-build-side-110780-59086111-6570987/root/chroot_tmpdir/scmroot/rust-gstreamer'...
$ git fetch origin a98b8e55b6ca29ede3394901f96bc6162d6336e7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer
 * [new ref]         a98b8e55b6ca29ede3394901f96bc6162d6336e7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a98b8e5 Update to ron 0.10