$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-player.git /var/lib/mock/f38-build-side-43-rust-devel-1402294-31187/root/chroot_tmpdir/scmroot/rust-gstreamer-player
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1402294-31187/root/chroot_tmpdir/scmroot/rust-gstreamer-player'...
$ git fetch origin a1f49707f01eacd50758db78d9599f4ef9589961:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-player
 * [new ref]         a1f49707f01eacd50758db78d9599f4ef9589961 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1f4970 Update to 0.21.0