win: fix delay-load hook for electron 4

PR-URL: #1566
Reviewed-By: Refael Ackermann <refack@gmail.com>

addon.gypi

@@ -1,6 +1,7 @@
 {
   'variables' : {
     'node_engine_include_dir%': 'deps/v8/include',
+    'node_host_binary%': 'node'
   },
   'target_defaults': {
     'type': 'loadable_module',
@@ -70,12 +71,13 @@
         # is named node.exe, iojs.exe, or something else.
         'conditions': [
           [ 'OS=="win"', {
+            'defines': [ 'HOST_BINARY=\"<(node_host_binary)<(EXECUTABLE_SUFFIX)\"', ],
             'sources': [
               '<(node_gyp_dir)/src/win_delay_load_hook.cc',
             ],
             'msvs_settings': {
               'VCLinkerTool': {
-                'DelayLoadDLLs': [ 'iojs.exe', 'node.exe' ],
+                'DelayLoadDLLs': [ '<(node_host_binary)<(EXECUTABLE_SUFFIX)' ],
                 # Don't print a linker warning when no imports from either .exe
                 # are used.
                 'AdditionalOptions': [ '/ignore:4199' ],

src/win_delay_load_hook.cc

@@ -1,10 +1,10 @@
 /*
  * When this file is linked to a DLL, it sets up a delay-load hook that
- * intervenes when the DLL is trying to load 'node.exe' or 'iojs.exe'
- * dynamically. Instead of trying to locate the .exe file it'll just return
- * a handle to the process image.
+ * intervenes when the DLL is trying to load the host executable
+ * dynamically. Instead of trying to locate the .exe file it'll just
+ * return a handle to the process image.
  *
- * This allows compiled addons to work when node.exe or iojs.exe is renamed.
+ * This allows compiled addons to work when the host executable is renamed.
  */
 
 #ifdef _MSC_VER
@@ -23,8 +23,7 @@ static FARPROC WINAPI load_exe_hook(unsigned int event, DelayLoadInfo* info) {
   if (event != dliNotePreLoadLibrary)
     return NULL;
 
-  if (_stricmp(info->szDll, "iojs.exe") != 0 &&
-      _stricmp(info->szDll, "node.exe") != 0)
+  if (_stricmp(info->szDll, HOST_BINARY) != 0)
     return NULL;
 
   m = GetModuleHandle(NULL);

test/test-addon.js

@@ -4,14 +4,19 @@ var test = require('tape')
 var path = require('path')
 var fs = require('graceful-fs')
 var child_process = require('child_process')
+var os = require('os')
 var addonPath = path.resolve(__dirname, 'node_modules', 'hello_world')
 var nodeGyp = path.resolve(__dirname, '..', 'bin', 'node-gyp.js')
 var execFileSync = child_process.execFileSync || require('./process-exec-sync')
 var execFile = child_process.execFile
 
-function runHello() {
+function runHello(hostProcess) {
+  if (!hostProcess) {
+    hostProcess = process.execPath
+  }
   var testCode = "console.log(require('hello_world').hello())"
-  return execFileSync(process.execPath, ['-e', testCode], { cwd: __dirname }).toString()
+  console.log('running ', hostProcess);
+  return execFileSync(hostProcess, ['-e', testCode], { cwd: __dirname }).toString()
 }
 
 function getEncoding() {
@@ -111,3 +116,29 @@ test('build simple addon in path with non-ascii characters', function (t) {
   proc.stdout.setEncoding('utf-8')
   proc.stderr.setEncoding('utf-8')
 })
+
+test('addon works with renamed host executable', function (t) {
+  // No `fs.copyFileSync` before node8.
+  if (process.version.substr(1).split('.')[0] < 8) {
+    t.skip("skipping test for old node version");
+    t.end();
+    return;
+  }
+
+  t.plan(3)
+
+  var notNodePath = path.join(os.tmpdir(), 'notnode' + path.extname(process.execPath))
+  fs.copyFileSync(process.execPath, notNodePath)
+
+  var cmd = [nodeGyp, 'rebuild', '-C', addonPath, '--loglevel=verbose']
+  var proc = execFile(process.execPath, cmd, function (err, stdout, stderr) {
+    var logLines = stderr.toString().trim().split(/\r?\n/)
+    var lastLine = logLines[logLines.length-1]
+    t.strictEqual(err, null)
+    t.strictEqual(lastLine, 'gyp info ok', 'should end in ok')
+    t.strictEqual(runHello(notNodePath).trim(), 'world')
+    fs.unlinkSync(notNodePath)
+  })
+  proc.stdout.setEncoding('utf-8')
+  proc.stderr.setEncoding('utf-8')
+})