$ git clone -n https://src.fedoraproject.org/rpms/rust-cssparser-macros.git /var/lib/mock/f39-build-1466348-33663/root/chroot_tmpdir/scmroot/rust-cssparser-macros
Cloning into '/var/lib/mock/f39-build-1466348-33663/root/chroot_tmpdir/scmroot/rust-cssparser-macros'...
$ git fetch origin fcb589c2f5e60407aa4af7a3288f94dc090181a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cssparser-macros
 * [new ref]         fcb589c2f5e60407aa4af7a3288f94dc090181a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcb589c Update to 0.6.1