Init libSass submodule when npm installing via git url

scripts/build.js

@@ -3,6 +3,7 @@
  */
 
 var eol = require('os').EOL,
+    pkg = require('../package.json'),
     fs = require('fs'),
     mkdir = require('mkdirp'),
     path = require('path'),
@@ -46,6 +47,49 @@ function afterBuild(options) {
 }
 
 /**
+ * initSubmodules
+ *
+ * @param {Function} cb
+ * @api private
+ */
+
+function initSubmodules(cb) {
+  var errorMsg = '';
+  var git = spawn(['LIBSASS_GIT_VERSION=', pkg.libsass, ' ./scripts/git.sh'].join());
+  git.stderr.on('data', function(data) {
+    errorMsg += data.toString();
+  });
+  git.on('close', function(code) {
+    var error;
+    if (code !== 0) {
+      error = { message: errorMsg + 'Unable to checkout the libSass submodule' };
+    }
+    cb(error);
+  });
+}
+
+/**
+ * installGitDependencies
+ *
+ * @param {Function} cb
+ * @api private
+ */
+
+function installGitDependencies(cb) {
+  var libsassPath = './src/libsass';
+
+  if (fs.access) { // node 0.12+, iojs 1.0.0+
+    fs.access(libsassPath, fs.R_OK, function(err) {
+      err && err.code === 'ENOENT' ? initSubmodules(cb) : cb();
+    });
+  } else { // node < 0.12
+    fs.exists(libsassPath, function(exists) {
+      exists ? cb() : initSubmodules(cb);
+    });
+  }
+}
+
+/**
  * Build
  *
  * @param {Object} options
@@ -53,6 +97,12 @@ function afterBuild(options) {
  */
 
 function build(options) {
+  installGitDependencies(function(err) {
+    if (err) {
+      console.error(err.message);
+      process.exit(1);
+    }
+
     var args = [path.join('node_modules', 'pangyp', 'bin', 'node-gyp'), 'rebuild'].concat(
       ['libsass_ext', 'libsass_cflags', 'libsass_ldflags', 'libsass_library'].map(function(subject) {
         return ['--', subject, '=', process.env[subject.toUpperCase()] || ''].join('');
@@ -72,6 +122,8 @@ function build(options) {
       }
 
       console.error(errorCode === 127 ? 'node-gyp not found!' : 'Build failed');
+      process.exit(1);
+    });
   });
 }
 

scripts/git.sh

+#!/bin/sh
+
+git clone --depth=1 git@github.com:sass/libsass.git ./src/libsass
+cd ./src/libsass
+git checkout $LIBSASS_GIT_VERSION