refactor how nix derivations are organized and built

Makefile

@@ -1,4 +1,25 @@
 
-install:
-	nix-build -A install
+all:
+	nix-build -A entrypoint --arg baseConfig '(import ./config.nix) // { staticProxyURL = ""; }'
+
+all.prod:
+	nix-build -A entrypoint --arg baseConfig '(import ./prod.config.nix)'
+
+install.prod:
+	nix-build -A install --arg baseConfig '(import ./prod.config.nix)'
 	./result
+
+srv.shell:
+	nix-shell -A srv.shell --command 'cd srv; return'
+
+static.shell:
+	nix-shell -A static.shell --command 'cd static; return'
+
+static.serve:
+	nix-shell -A static.shell --run 'cd static; static-serve'
+
+static.depShell:
+	nix-shell -A static.depShell --command 'cd static; return'
+
+static.lock:
+	nix-shell -A static.depShell  --run 'bundler lock; bundix; rm -rf .bundle vendor'

config.nix

@@ -1,10 +1,14 @@
 {
+    runDir = "/tmp/mediocre-blog/run";
+    dataDir = "/tmp/mediocre-blog/data";
+
     powSecret = "ssshhh";
     mlSMTPAddr = "";
     mlSMTPAuth = "";
-    dataDir = "/tmp/mediocre-blog-data";
     publicURL = "http://localhost:4000";
     listenProto = "tcp";
     listenAddr = ":4000";
-    redisListenPath = "/tmp/mediocre-blog-redis";
+
+    # If empty then a derived static directory is used
+    staticProxyURL = "http://127.0.0.1:4001";
 }

default.nix

@@ -1,28 +1,27 @@
-let
-    utils = (import ./nix) {};
-    pkgs = utils.pkgs;
-    system = utils.system;
-in
-    {config ? ./config.nix}: rec {
-        config = (import ./config.nix);
+{
 
-        static = (import ./static).build;
+    pkgs ? import (fetchTarball {
+        name = "nixpkgs-21-05";
+        url = "https://github.com/NixOS/nixpkgs/archive/7e9b0dff974c89e070da1ad85713ff3c20b0ca97.tar.gz";
+        sha256 = "1ckzhh24mgz6jd1xhfgx0i9mijk6xjqxwsshnvq789xsavrmsc36";
+    }) {},
 
-        srv = (import ./srv).build;
-        srvBin = pkgs.writeScript "mediocregopher-mediocre-blog-srvBin" ''
-            #!/bin/sh
-            exec ${srv}/bin/mediocre-blog \
-                -pow-secret   "${config.powSecret}" \
-                -ml-smtp-addr "${config.mlSMTPAddr}" \
-                -ml-smtp-auth "${config.mlSMTPAuth}" \
-                -data-dir     "${config.dataDir}" \
-                -public-url   "${config.publicURL}" \
-                -static-dir   "${static}" \
-                -listen-proto "${config.listenProto}" \
-                -listen-addr  "${config.listenAddr}"
-        '';
+    baseConfig ? import ./config.nix,
 
-        redisCfg = pkgs.writeText "mediocregopher-mediocre-blog-redisCfg" ''
+}: rec {
+
+    config = baseConfig // {
+        redisListenPath = "${config.runDir}/redis";
+    };
+
+    static = (import ./static) { inherit pkgs; };
+
+    srv = (import ./srv) {
+        inherit pkgs config;
+        staticBuild=static.build;
+    };
+
+    redisCfg = pkgs.writeText "mediocre-blog-redisCfg" ''
         port 0
         unixsocket ${config.redisListenPath}
         daemonize no
@@ -33,19 +32,19 @@ in
         dir ${config.dataDir}/redis
     '';
 
-        redisBin = pkgs.writeScript "mediocregopher-mediocre-blog-redisBin" ''
+    redisBin = pkgs.writeScript "mediocre-blog-redisBin" ''
         #!/bin/sh
         mkdir -p ${config.dataDir}/redis
         exec ${pkgs.redis}/bin/redis-server ${redisCfg}
     '';
 
-        circusCfg = pkgs.writeText "mediocregopher-mediocre-blog-circusCfg" ''
+    circusCfg = pkgs.writeText "mediocre-blog-circusCfg" ''
         [circus]
         endpoint = tcp://127.0.0.1:0
         pubsub_endpoint = tcp://127.0.0.1:0
 
         [watcher:srv]
-            cmd = ${srvBin}
+        cmd = ${srv.bin}
         numprocesses = 1
 
         [watcher:redis]
@@ -53,11 +52,14 @@ in
         numprocesses = 1
     '';
 
-        circusBin = pkgs.writeScript "mediocregopher-mediocre-blog-circusBin" ''
+    entrypoint = pkgs.writeScript "mediocre-blog-entrypoint" ''
+        #!/bin/sh
+        mkdir -p ${config.runDir}
+        mkdir -p ${config.dataDir}
         exec ${pkgs.circus}/bin/circusd ${circusCfg}
     '';
 
-        service = pkgs.writeText "mediocregopher-mediocre-blog" ''
+    service = pkgs.writeText "mediocre-blog" ''
         [Unit]
         Description=mediocregopher mediocre blog
         Requires=network.target
@@ -67,13 +69,13 @@ in
         Restart=always
         RestartSec=1s
         User=mediocregopher
-            ExecStart=${circusBin}
+        ExecStart=${entrypoint}
 
         [Install]
         WantedBy=multi-user.target
     '';
 
-        install = pkgs.writeScript "mediocregopher-mediocre-blog" ''
+    install = pkgs.writeScript "mediocre-blog" ''
         set -e -x
 
         sudo cp ${service} /etc/systemd/system/mediocregopher-mediocre-blog.service
@@ -81,4 +83,4 @@ in
         sudo systemctl enable mediocregopher-mediocre-blog.service
         sudo systemctl restart mediocregopher-mediocre-blog.service
     '';
-    }
+}

nix/default.nix

@@ -1,13 +0,0 @@
-{
-    pkgs ? import (fetchTarball {
-        name = "nixpkgs-21-05";
-        url = "https://github.com/NixOS/nixpkgs/archive/7e9b0dff974c89e070da1ad85713ff3c20b0ca97.tar.gz";
-        sha256 = "1ckzhh24mgz6jd1xhfgx0i9mijk6xjqxwsshnvq789xsavrmsc36";
-    }) {},
-    system ? builtins.currentSystem,
-}:
-    {
-        pkgs = pkgs;
-        system = system;
-    }
-

srv/Makefile

@@ -1,7 +0,0 @@
-build:
-	nix-build -A build
-
-shell:
-	nix-shell -A shell
-
-

srv/default.nix

@@ -1,9 +1,18 @@
-let
-    utils = (import ../nix) {};
-    pkgs = utils.pkgs;
-    system = utils.system;
-in
-    {
+{pkgs, config, staticBuild}: rec {
+
+    opts = [
+        "-pow-secret=${config.powSecret}"
+        "-ml-smtp-addr=${config.mlSMTPAddr}"
+        "-ml-smtp-auth='${config.mlSMTPAuth}'"
+        "-data-dir=${config.dataDir}"
+        "-public-url=${config.publicURL}"
+        "-listen-proto=${config.listenProto}"
+        "-listen-addr=${config.listenAddr}"
+    ] ++ (
+        if config.staticProxyURL == ""
+        then [ "-static-dir=${staticBuild}" ]
+        else [ "-static-proxy-url=${config.staticProxyURL}" ]
+    );
 
     build = pkgs.buildGoModule {
         pname = "mediocre-blog-srv";
@@ -12,9 +21,18 @@ in
         vendorSha256 = "08wv94yv2wmlxzmanw551gixc8v8nl6zq2m721ig9nl3r540x46f";
     };
 
+    bin = pkgs.writeScript "mediocre-blog-srv-bin" ''
+        #!/bin/sh
+        exec ${build}/bin/mediocre-blog ${toString opts}
+    '';
+
+    runScript = pkgs.writeScriptBin "run-mediocre-blog" ''
+        go run ./cmd/mediocre-blog/main.go ${toString opts}
+    '';
+
     shell = pkgs.stdenv.mkDerivation {
         name = "mediocre-blog-srv-shell";
-            buildInputs = [ pkgs.go ];
+        buildInputs = [ pkgs.go runScript ];
     };
 
-    }
+}

static/Makefile

@@ -1,18 +0,0 @@
-build:
-	nix-build -A build
-
-clean:
-	rm -f result
-	rm -rf _site
-
-dev:
-	nix-shell -A dev
-
-shell:
-	nix-shell -A shell
-
-lock:
-	nix-shell -A depShell --run 'bundler lock; bundix; rm -rf .bundle vendor'
-
-update:
-	nix-shell -A depShell --run 'bundler update; bundler lock; bundix; rm -rf .bundle vendor'

static/default.nix

@@ -1,53 +1,39 @@
-let
-    utils = (import ../nix) {};
-    pkgs = utils.pkgs;
-    system = utils.system;
+{pkgs}: rec {
 
-    jekyll_env = pkgs.bundlerEnv {
-        name = "jekyll_env";
+    depInputs = [ pkgs.imagemagick pkgs.exiftool pkgs.bundler pkgs.bundix ];
+
+    depShell = pkgs.stdenv.mkDerivation {
+        name = "mediocre-blog-static-dep-shell";
+        buildInputs = depInputs;
+    };
+
+    jekyllEnv = pkgs.bundlerEnv {
+        name = "jekyllEnv";
         ruby = pkgs.ruby;
         gemdir = ./.;
     };
 
-    dep_inputs = [ pkgs.imagemagick pkgs.exiftool pkgs.bundler pkgs.bundix ];
-    all_inputs = [ jekyll_env ] ++ dep_inputs;
-in
-    {
-        build = derivation {
-            inherit jekyll_env system;
 
+    build = pkgs.stdenv.mkDerivation {
         name = "mediocre-blog-static";
-            builder = "${pkgs.bash}/bin/bash";
-            args = [
-                (pkgs.writeTextFile {
-                    name = "mediocre-blog-static-buildsh";
-                    text = ''
-                        source ${pkgs.stdenv}/setup
-                        set -e
+        src = ./src;
+        buildPhase = "${jekyllEnv}/bin/jekyll build";
+        installPhase = "mv _site $out";
+    };
 
-                        mkdir -p "$out"
-                        $jekyll_env/bin/jekyll build -s "${./src}" -d "$out"
+    serve = pkgs.writeScriptBin "static-serve" ''
+        #!/bin/sh
+        exec ${jekyllEnv}/bin/jekyll serve \
+            -s ./src \
+            -d ./_site \
+            -w -I -D \
+            -P 4001
     '';
-                    executable = true;
-                })
-            ];
-        };
 
-        dev = pkgs.stdenv.mkDerivation {
-            name = "mediocre-blog-static-dev";
-            buildInputs = all_inputs;
-            shellHook = ''
-                exec ${jekyll_env}/bin/jekyll serve -s ./src -d ./_site -w -I -D -H 0.0.0.0 -P 4001
-            '';
-        };
-
-        depShell = pkgs.stdenv.mkDerivation {
-            name = "mediocre-blog-static-dep-shell";
-            buildInputs = dep_inputs;
-        };
+    allInputs = depInputs ++ [ jekyllEnv serve ];
 
     shell = pkgs.stdenv.mkDerivation {
         name = "mediocre-blog-static-shell";
-            buildInputs = all_inputs;
+        buildInputs = allInputs;
     };
-    }
+}