Update README

README.md

@@ -65,17 +65,10 @@ https://git.sr.ht/~ehmry/dhall-genode/tree/master/Boot/package.dhall
 # Nix Flakes
 
 This repository is structured as a Nix flake, which is an experimental extension
-of Nix tooling. The flakes capable Nix frontend is available from Nixpkgs as
-`nixFlakes`.
+of Nix tooling. See https://www.tweag.io/posts/2020-05-25-flakes.html for an 
+introduction and tutorial.
 
-## Switching to flakes
-
-Non-NixOS users may install Nix using the following shell commands:
-
-```sh
-$ curl https://nixos.org/nix/install | sh
-$ nix-env -iA nixpkgs.nixFlakes
-```
+## Build Caching
 
 Those with IPv6 will want to the following to their */etc/nix/nix.conf* file:
 
@@ -85,13 +78,11 @@ trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDS
 ```
 
 
-NixOS users may switch to flakes using the following configuration:
+NixOS users may alternatively using the following configuration:
 
 ```nix
 { pkgs, ... }:
 {
-  nix.package = pkgs.nixFlakes;
-
   # The following enables the use of a binary cache (IPv6 only)
   nix.binaryCaches = [ "https://cache.server7.hq.c3d2.de" ];
   nix.binaryCachePublicKeys = [
@@ -100,27 +91,8 @@ NixOS users may switch to flakes using the following configuration:
 }
 ```
 
-All users regardless of distro must add the following to
-*~/.config/nix/nix.conf* to enable flakes:
-
-```
-experimental-features = nix-command flakes ca-references
-```
-
 ## Building from flakes
 
-### As a user
-
-```sh
-$ nix flake add genodepkgs git+https://git.sr.ht/~ehmry/genodepkgs
-$ nix build genodepkgs#checks.x86_64-linux.nova-x86
-
-# View the log if the result is already cached:
-$ nix log genodepkgs#checks.x86_64-linux.nova-x86
-```
-
-### As a hacker
-
 ```sh
 $ git clone https://git.sr.ht/~ehmry/genodepkgs
 $ cd genodepkgs
@@ -136,6 +108,14 @@ The Genode Labs toolchain is available here only for Linux and in binary form.
 However, an experimental LLVM cross-compiler is provided here. Bootstrapping GCC
 has not been practical due to its recursive autotools build system.
 
+The enter a shell with the toolchain:
+
+```shell
+nix run .#legacyPackages.x86_64-linux-x86_64-genode.stdenv.cc
+
+x86_64-unknown-genode-clang++ -v
+```
+
 # Building
 
 Bootstrapping the build tooling can take several hours on a laptop, therefore it
@@ -146,9 +126,7 @@ Hydra.
 
 # Testing
 
-Tests are performed using QEMU and a test driver similar to what is used by
-NixOS (ours has not been ported to Python however). The test artifacts are built
-as follows:
+Tests are performed using QEMU, the test artifacts are built as follows:
 
 ```shell
 # Build a test log from a QEMU test run:
@@ -157,6 +135,9 @@ nix build .#checks.x86_64-linux.nova-x86
 # Build an ISO of the test run:
 nix build .#checks.x86_64-linux.nova-x86.iso
 
+# Build a tarball of the Nix store internal to a test:
+nix build .#checks.x86_64-linux.nova-x86.store
+
 # Build the Dhall boot description of the test run:
 nix build .#checks.x86_64-linux.nova-x86.config
 ```
@@ -295,9 +276,9 @@ Others are simply introduced as an aid to the reader:
 
 # Legal
 
-This repository is for trivial packaging algebra and metadata that exists only
-for the sake of richer and more meaningful code in external repositories. All
-works committed to this repository, unless otherwise noted, shall be implicitly
+This repository is for trivial packaging and metadata that exists only for the 
+sake of richer and more meaningful code in external repositories. All works 
+committed to this repository, unless otherwise noted, shall be implicitly 
 licensed under a [CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/deed)
 public domain dedication.