Hi, there's a new branch "wip-docker-test" which has a new (non-system) test tests/docker-inception.scm . You can run it via: make TESTS=tests/docker-inception.scm check Unfortunately, it fails with some inscrutable qemu error message: qemu-system-x86_64: -virtfs local,path=/home/dannym/src/guix-ns14/guix/test-tmp/store,security_model=none,mount_tag=TAGy5ajggutlpmxibmqfchkokzxuwid: cannot ini tialize fsdev 'TAGy5ajggutlpmxibmqfchkokzxuwid': failed to open '/home/dannym/src/guix-ns14/guix/test-tmp/store': No such file or directory Trying to fix it (setting NIX_STORE etc) made it worse, so I reverted that part. Help?