Problems getting started with nix

md:~ maarten$ nix-channel --update
downloading Nix expressions from `http://nixos.org/releases/nixpkgs/channels/nixpkgs-unstable//nixexprs.tar.bz2'...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 3465k  100 3465k    0     0   857k      0  0:00:04  0:00:04 --:--:--  942k
error: creating directory `/nix/var/nix/db/info': Permission denied
cannot fetch `http://nixos.org/releases/nixpkgs/channels/nixpkgs-unstable//nixexprs.tar.bz2' at /usr/local/bin/nix-channel line 114.






md:nix-0.16 maarten$ nix-env -i hello
installing `hello-2.7'
don't know how to build the following paths (may be caused by read-only store access):
  /nix/store/w5yi35kn33565lh7lgn3ldjxwg2sg2q8-hello-2.7.drv
error: cannot build derivation `/nix/store/w5yi35kn33565lh7lgn3ldjxwg2sg2q8-hello-2.7.drv' - no write access to the Nix store





md:nix-0.16 maarten$ sudo nix-env -i hello
Password:
installing `hello-2.7'
...lots of output...
checking whether mknod can create fifo without root privileges... configure: error: in `/private/tmp/nix-build-016anfy1ddnzsfxnnap7ff40ys3wbr48-gnutar-1.25.drv-0/tar-1.25':
configure: error: you should not run configure as root (set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)
See `config.log' for more details.
\e[q\e[qbuilder for `/nix/store/016anfy1ddnzsfxnnap7ff40ys3wbr48-gnutar-1.25.drv' failed with exit code 1
cannot build derivation `/nix/store/cwvjh9lcnnkprrlq0vqchcyfa58ipcni-stdenv-nix.drv': 1 dependencies couldn't be built
cannot build derivation `/nix/store/w5yi35kn33565lh7lgn3ldjxwg2sg2q8-hello-2.7.drv': 1 dependencies couldn't be built
error: build of `/nix/store/w5yi35kn33565lh7lgn3ldjxwg2sg2q8-hello-2.7.drv' failed







md:nix-0.16 maarten$ export FORCE_UNSAFE_CONFIGURE=1
md:nix-0.16 maarten$ sudo nix-env -i hello
Password:
installing `hello-2.7'
...lots of output...
checking whether mknod can create fifo without root privileges... configure: error: in `/private/tmp/nix-build-016anfy1ddnzsfxnnap7ff40ys3wbr48-gnutar-1.25.drv-0/tar-1.25':
configure: error: you should not run configure as root (set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)
See `config.log' for more details.
\e[q\e[qbuilder for `/nix/store/016anfy1ddnzsfxnnap7ff40ys3wbr48-gnutar-1.25.drv' failed with exit code 1
cannot build derivation `/nix/store/cwvjh9lcnnkprrlq0vqchcyfa58ipcni-stdenv-nix.drv': 1 dependencies couldn't be built
cannot build derivation `/nix/store/w5yi35kn33565lh7lgn3ldjxwg2sg2q8-hello-2.7.drv': 1 dependencies couldn't be built
error: build of `/nix/store/w5yi35kn33565lh7lgn3ldjxwg2sg2q8-hello-2.7.drv' failed