Fix node deploy path handling. (#49)

* Fix node deploy path handling.

This patch uses a temporary symlink to envs/APP/node_modules to force
node to install the modules into the right place even on older node
versions, like v4.2.6 which ships with Unbuntu 16.04.

Apps launching node servers will need to manually set
NODE_PATH="${VIRTUAL_ENV}/node_modules" to have it run correctly, and
in future we should consider setting this in spawn_app (though currently
spawn_app does not know what kind of app it's spawning).

* Add NODE_PATH to spawn env if node env present.

piku.py

@@ -415,26 +415,29 @@ def deploy_go(app, deltas={}):
 def deploy_node(app, deltas={}):
     """Deploy a Node  application"""
 
-    node_path = join(ENV_ROOT, app)
+    node_path = join(ENV_ROOT, app, "node_modules")
+    node_path_tmp = join(APP_ROOT, app, "node_modules")
     env_file = join(APP_ROOT, app, 'ENV')
-    deps = join(ENV_ROOT, app, 'lib', 'node_modules')
+    deps = join(APP_ROOT, app, 'package.json')
 
     first_time = False
-    if not exists(deps):
+    if not exists(node_path):
         echo("-----> Creating node_modules for '{}'".format(app), fg='green')
-        makedirs(deps)
+        makedirs(node_path)
         first_time = True
 
     if exists(deps):
         if first_time or getmtime(deps) > getmtime(node_path):
             echo("-----> Running npm for '{}'".format(app), fg='green')
             env = {
-                'NODE_PATH': '{}/lib/node_modules'.format(node_path),
-                'NPM_CONFIG_PREFIX': node_path,
+                'NODE_PATH': node_path,
+                'NPM_CONFIG_PREFIX': abspath(join(node_path, "..")),
             }
             if exists(env_file):
                 env.update(parse_settings(env_file, env))
+            symlink(node_path, node_path_tmp)
             call('npm install', cwd=join(APP_ROOT, app), env=env, shell=True)
+            unlink(node_path_tmp)
     spawn_app(app, deltas)
 
 
@@ -507,7 +510,12 @@ def spawn_app(app, deltas={}):
         'NGINX_IPV6_ADDRESS': '[::]',
         'BIND_ADDRESS': '127.0.0.1',
     }
-    
+
+    # add node path if present
+    node_path = join(virtualenv_path, "node_modules")
+    if exists(node_path):
+        env["NODE_PATH"] = node_path
+
     # Load environment variables shipped with repo (if any)
     if exists(env_file):
         env.update(parse_settings(env_file, env))