Allow Ghost to run using sockets

Closes #887
- Adds getSocket function > Returns the socket location if sockets are enabled or false
- Adds startGhost function > Callback for server.listen

core/server.js

@@ -4,6 +4,7 @@ var express     = require('express'),
     _           = require('underscore'),
     colors      = require('colors'),
     semver      = require('semver'),
+    fs          = require('fs'),
     slashes     = require('connect-slashes'),
     errors      = require('./server/errorHandling'),
     admin       = require('./server/controllers/admin'),
@@ -360,14 +361,15 @@ when(ghost.init()).then(function () {
     server.get('/:slug/', frontend.single);
     server.get('/', frontend.homepage);
 
+    // Are we using sockets? Custom socket or the default?
+    function getSocket() {
+        if (ghost.config().server.hasOwnProperty('socket')) {
+            return _.isString(ghost.config().server.socket) ? ghost.config().server.socket : path.join(__dirname, '../content/', process.env.NODE_ENV + '.socket');
+        }
+        return false;
+    }
 
-
+    function startGhost() {
-    // ## Start Ghost App
-    server.listen(
-        ghost.config().server.port,
-        ghost.config().server.host,
-        function () {
-
         // Tell users if their node version is not supported, and exit
         if (!semver.satisfies(process.versions.node, packageInfo.engines.node)) {
             console.log(
@@ -403,7 +405,7 @@ when(ghost.init()).then(function () {
             console.log(
                 "Ghost is running...".green,
                 "\nListening on",
-                    ghost.config().server.host + ':' + ghost.config().server.port,
+                getSocket() || ghost.config().server.host + ':' + ghost.config().server.port,
                 "\nUrl configured as:",
                 ghost.config().url,
                 "\nCtrl+C to shut down".grey
@@ -423,5 +425,23 @@ when(ghost.init()).then(function () {
         // Let everyone know we have finished loading
         loading.resolve();
     }
+
+    // ## Start Ghost App
+    if (getSocket()) {
+        // Make sure the socket is gone before trying to create another
+        fs.unlink(getSocket(), function (err) {
+            server.listen(
+                getSocket(),
+                startGhost
             );
+            fs.chmod(getSocket(), '0744');
+        });
+
+    } else {
+        server.listen(
+            ghost.config().server.port,
+            ghost.config().server.host,
+            startGhost
+        );
+    }
 }, errors.logAndThrowError);