Change the nix-bitcoin deployment from forking this repo to importing the module

Instead of forking this repo, it is now recommended that users simply import the
nix-bitcoin module. This commit adds an example directory that contains the
network/ examples and a shell.nix for deployment with nixops.

.gitignore

@@ -1 +1 @@
-/secrets/
+/example/secrets/

examples/configuration.nix

@@ -4,8 +4,6 @@
 
 { config, pkgs, lib, ... }: {
   imports = [
-    ./modules/nix-bitcoin.nix
-
     # Use hardened kernel profile. See
     # https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/profiles/hardened.nix
     # for the enabled options.

examples/nixops/node.nix

@@ -3,7 +3,7 @@
 
   bitcoin-node =
     { config, pkgs, lib, ... }: {
-      imports = [ ../configuration.nix ];
+      imports = [ ../configuration.nix <nix-bitcoin/modules/nix-bitcoin.nix> ];
 
       deployment.keys = builtins.mapAttrs (n: v: {
         keyFile = "${toString ../secrets}/${n}";

examples/shell.nix

@@ -0,0 +1,29 @@
+let
+  # TODO:
+  # nix-bitcoin-path = builtins.fetchTarball {
+  #   url = "https://github.com/fort-nix/nix-bitcoin/archive/master.tar.gz";
+  #   sha256 = "1mlvfakjgbl67k4k9mgafp5gvi2gb2p57xwxwffqr4chx8g848n7";
+  # };
+  nix-bitcoin-path = ../.;
+  nixpkgs-path = (import "${toString nix-bitcoin-path}/pkgs/nixpkgs-pinned.nix").nixpkgs;
+  nixpkgs = import nixpkgs-path {};
+  nix-bitcoin = nixpkgs.callPackage nix-bitcoin-path {};
+in
+with nixpkgs;
+
+stdenv.mkDerivation rec {
+  name = "nix-bitcoin-environment";
+
+  buildInputs = [ nix-bitcoin.nixops19_09 figlet ];
+
+  shellHook = ''
+    export NIX_PATH="nixpkgs=${nixpkgs-path}:nix-bitcoin=${toString nix-bitcoin-path}:."
+    # ssh-agent and nixops don't play well together (see
+    # https://github.com/NixOS/nixops/issues/256). I'm getting `Received disconnect
+    # from 10.1.1.200 port 22:2: Too many authentication failures` if I have a few
+    # keys already added to my ssh-agent.
+    export SSH_AUTH_SOCK=""
+    figlet "nix-bitcoin"
+    (mkdir -p secrets; cd secrets; ${nix-bitcoin.generate-secrets})
+  '';
+}

shell.nix

@@ -7,7 +7,6 @@ stdenv.mkDerivation rec {
   name = "nix-bitcoin-environment";
 
   nixops19_09 = callPackage ./pkgs/nixops {};
-  make-secrets = callPackage ./pkgs/generate-secrets/update-and-generate.nix {};
 
   buildInputs = [ nixops19_09 figlet ];
 
@@ -18,7 +17,6 @@ stdenv.mkDerivation rec {
     # from 10.1.1.200 port 22:2: Too many authentication failures` if I have a few
     # keys already added to my ssh-agent.
     export SSH_AUTH_SOCK=""
-    figlet "nix-bitcoin"
+    figlet "nix-bitcoin dev shell"
-    (mkdir -p secrets; cd secrets; ${make-secrets})
   '';
 }