diff --git a/default.nix b/default.nix
index bb9d8f8..78a86fd 100644
--- a/default.nix
+++ b/default.nix
@@ -28,8 +28,6 @@
         staticBuild=static.build;
     };
 
-    srvBin = srv.bin;
-
     redisCfg = pkgs.writeText "mediocre-blog-redisCfg" ''
         port 0
         unixsocket ${config.redisListenPath}
diff --git a/srv/default.nix b/srv/default.nix
index 3037fd7..5510744 100644
--- a/srv/default.nix
+++ b/srv/default.nix
@@ -1,62 +1,66 @@
 {
+  bash,
+  go,
   buildGoModule,
   writeScript,
-  writeScriptBin,
+  writeText,
   stdenv,
 
   config,
   staticBuild,
 }: rec {
 
-    env = ''
+    init = writeText "mediocre-blog-srv-init" ''
 
-      export MEDIOCRE_BLOG_DATA_DIR=${config.dataDir}
+      export MEDIOCRE_BLOG_DATA_DIR="${config.dataDir}"
+      mkdir -p "${config.dataDir}"
 
       # mailing list
-      export MEDIOCRE_BLOG_ML_SMTP_ADDR=${config.mlSMTPAddr}
-      export MEDIOCRE_BLOG_ML_SMTP_AUTH='${config.mlSMTPAuth}'
-      export MEDIOCRE_BLOG_ML_PUBLIC_URL=${config.mlPublicURL}
+      export MEDIOCRE_BLOG_ML_SMTP_ADDR="${config.mlSMTPAddr}"
+      export MEDIOCRE_BLOG_ML_SMTP_AUTH="${config.mlSMTPAuth}"
+      export MEDIOCRE_BLOG_ML_PUBLIC_URL="${config.mlPublicURL}"
 
       # redis
       export MEDIOCRE_BLOG_REDIS_PROTO=unix
-      export MEDIOCRE_BLOG_REDIS_ADDR=${config.redisListenPath}
+      export MEDIOCRE_BLOG_REDIS_ADDR="${config.redisListenPath}"
 
       # pow
-      export MEDIOCRE_BLOG_POW_SECRET=${config.powSecret}
+      export MEDIOCRE_BLOG_POW_SECRET="${config.powSecret}"
 
       # static proxy
       if [ "${config.staticProxyURL}" == "" ]; then
-        export MEDIOCRE_BLOG_STATIC_DIR=${staticBuild}
+        export MEDIOCRE_BLOG_STATIC_DIR="${staticBuild}"
       else
-        export MEDIOCRE_BLOG_STATIC_URL=${config.staticProxyURL}
+        export MEDIOCRE_BLOG_STATIC_URL="${config.staticProxyURL}"
       fi
 
       # listening
-      export MEDIOCRE_BLOG_LISTEN_PROTO=${config.listenProto}
-      export MEDIOCRE_BLOG_LISTEN_ADDR=${config.listenAddr}
+      export MEDIOCRE_BLOG_LISTEN_PROTO="${config.listenProto}"
+      export MEDIOCRE_BLOG_LISTEN_ADDR="${config.listenAddr}"
     '';
 
     build = buildGoModule {
         pname = "mediocre-blog-srv";
         version = "dev";
-        src = ./.;
-        vendorSha256 = "02szg1lisfjk8pk9pflbyv97ykg9362r4fhd0w0p2a7c81kf9b8y";
+        src = ./src;
+        vendorSha256 = "sha256-/F62WVkI50woo5J0xZOAn0g0WWkDna4wIBeVvbhAGzs=";
 
         # disable tests
         checkPhase = '''';
     };
 
     bin = writeScript "mediocre-blog-srv-bin" ''
-        #!/bin/sh
-        mkdir -p "${config.dataDir}"
-        source ${env}
+        #!${bash}
+        source ${init}
         exec ${build}/bin/mediocre-blog
     '';
 
     shell = stdenv.mkDerivation {
         name = "mediocre-blog-srv-shell";
+        buildInputs = [ go build ];
         shellHook = ''
-          source ${env}
+          source ${init}
+          cd src
         '';
     };
 }
diff --git a/srv/api/api.go b/srv/src/api/api.go
similarity index 100%
rename from srv/api/api.go
rename to srv/src/api/api.go
diff --git a/srv/api/apiutils/apiutils.go b/srv/src/api/apiutils/apiutils.go
similarity index 100%
rename from srv/api/apiutils/apiutils.go
rename to srv/src/api/apiutils/apiutils.go
diff --git a/srv/api/chat.go b/srv/src/api/chat.go
similarity index 100%
rename from srv/api/chat.go
rename to srv/src/api/chat.go
diff --git a/srv/api/csrf.go b/srv/src/api/csrf.go
similarity index 100%
rename from srv/api/csrf.go
rename to srv/src/api/csrf.go
diff --git a/srv/api/mailinglist.go b/srv/src/api/mailinglist.go
similarity index 100%
rename from srv/api/mailinglist.go
rename to srv/src/api/mailinglist.go
diff --git a/srv/api/middleware.go b/srv/src/api/middleware.go
similarity index 100%
rename from srv/api/middleware.go
rename to srv/src/api/middleware.go
diff --git a/srv/api/pow.go b/srv/src/api/pow.go
similarity index 100%
rename from srv/api/pow.go
rename to srv/src/api/pow.go
diff --git a/srv/cfg/cfg.go b/srv/src/cfg/cfg.go
similarity index 100%
rename from srv/cfg/cfg.go
rename to srv/src/cfg/cfg.go
diff --git a/srv/cfg/cfg_test.go b/srv/src/cfg/cfg_test.go
similarity index 100%
rename from srv/cfg/cfg_test.go
rename to srv/src/cfg/cfg_test.go
diff --git a/srv/chat/chat.go b/srv/src/chat/chat.go
similarity index 100%
rename from srv/chat/chat.go
rename to srv/src/chat/chat.go
diff --git a/srv/chat/chat_test.go b/srv/src/chat/chat_test.go
similarity index 100%
rename from srv/chat/chat_test.go
rename to srv/src/chat/chat_test.go
diff --git a/srv/chat/user.go b/srv/src/chat/user.go
similarity index 100%
rename from srv/chat/user.go
rename to srv/src/chat/user.go
diff --git a/srv/chat/user_test.go b/srv/src/chat/user_test.go
similarity index 100%
rename from srv/chat/user_test.go
rename to srv/src/chat/user_test.go
diff --git a/srv/chat/util.go b/srv/src/chat/util.go
similarity index 100%
rename from srv/chat/util.go
rename to srv/src/chat/util.go
diff --git a/srv/cmd/mailinglist-cli/main.go b/srv/src/cmd/mailinglist-cli/main.go
similarity index 100%
rename from srv/cmd/mailinglist-cli/main.go
rename to srv/src/cmd/mailinglist-cli/main.go
diff --git a/srv/cmd/mediocre-blog/main.go b/srv/src/cmd/mediocre-blog/main.go
similarity index 100%
rename from srv/cmd/mediocre-blog/main.go
rename to srv/src/cmd/mediocre-blog/main.go
diff --git a/srv/cmd/userid-calc-cli/main.go b/srv/src/cmd/userid-calc-cli/main.go
similarity index 100%
rename from srv/cmd/userid-calc-cli/main.go
rename to srv/src/cmd/userid-calc-cli/main.go
diff --git a/srv/go.mod b/srv/src/go.mod
similarity index 100%
rename from srv/go.mod
rename to srv/src/go.mod
diff --git a/srv/go.sum b/srv/src/go.sum
similarity index 100%
rename from srv/go.sum
rename to srv/src/go.sum
diff --git a/srv/mailinglist/mailer.go b/srv/src/mailinglist/mailer.go
similarity index 100%
rename from srv/mailinglist/mailer.go
rename to srv/src/mailinglist/mailer.go
diff --git a/srv/mailinglist/mailinglist.go b/srv/src/mailinglist/mailinglist.go
similarity index 100%
rename from srv/mailinglist/mailinglist.go
rename to srv/src/mailinglist/mailinglist.go
diff --git a/srv/mailinglist/store.go b/srv/src/mailinglist/store.go
similarity index 100%
rename from srv/mailinglist/store.go
rename to srv/src/mailinglist/store.go
diff --git a/srv/mailinglist/store_test.go b/srv/src/mailinglist/store_test.go
similarity index 100%
rename from srv/mailinglist/store_test.go
rename to srv/src/mailinglist/store_test.go
diff --git a/srv/pow/pow.go b/srv/src/pow/pow.go
similarity index 100%
rename from srv/pow/pow.go
rename to srv/src/pow/pow.go
diff --git a/srv/pow/pow_test.go b/srv/src/pow/pow_test.go
similarity index 100%
rename from srv/pow/pow_test.go
rename to srv/src/pow/pow_test.go
diff --git a/srv/pow/store.go b/srv/src/pow/store.go
similarity index 100%
rename from srv/pow/store.go
rename to srv/src/pow/store.go
diff --git a/srv/pow/store_test.go b/srv/src/pow/store_test.go
similarity index 100%
rename from srv/pow/store_test.go
rename to srv/src/pow/store_test.go