Mostly automatic incremental link enabling

tools/win/supalink/install_supalink.py

Index: tools/win/supalink/install_supalink.py
diff --git a/tools/win/supalink/install_supalink.py b/tools/win/supalink/install_supalink.py
new file mode 100644
index 0000000000000000000000000000000000000000..6aeaa064a7ee08444eef26102250510bfcae314d
--- /dev/null
+++ b/tools/win/supalink/install_supalink.py
@@ -0,0 +1,108 @@
+#!/usr/bin/env python
+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import shutil
+import subprocess
+import sys
+import tempfile
+import _winreg
+
+
+VSVARS_PATH = ('C:\\Program Files (x86)\\Microsoft Visual Studio 9.0\\'
+               'Common7\\Tools\\vsvars32.bat')
+
+
+def run_with_vsvars(cmd):
+  (fd, filename) = tempfile.mkstemp('.bat', text=True)
+  f = os.fdopen(fd, "w")
+  f.write('@echo off\n')
+  f.write('call "%s"\n' % VSVARS_PATH)
+  f.write(cmd + '\n')
+  f.close()
+  try:
+    p = subprocess.Popen([filename], shell=True, stdout=subprocess.PIPE,
+        universal_newlines=True)
+    out, err = p.communicate()
+    return p.returncode, out
+  finally:
+    os.unlink(filename)
+
+
+def get_vc_dir():
+  rc, out = run_with_vsvars('echo VCINSTALLDIR=%VCINSTALLDIR%')
+  for line in out.splitlines():
+    if line.startswith('VCINSTALLDIR='):
+      return line[len('VCINSTALLDIR='):]
+  return None
+
+
+def main():
+  vcdir = os.environ.get('VCINSTALLDIR')
+  if not vcdir:
+    vcdir = get_vc_dir()
+    if not vcdir:
+      print 'Couldn\'t get VCINSTALLDIR. Run vsvars32.bat?'
+      return 1
+    os.environ['PATH'] += (';' + os.path.join(vcdir, 'bin') +
+                           ';' + os.path.join(vcdir, '..\\Common7\\IDE'))
+
+  # Switch to our own dir.
+  os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+  # Verify that we can find link.exe.
+  link = os.path.join(vcdir, 'bin', 'link.exe')
+  link_backup = os.path.join(vcdir, 'bin', 'link.exe.supalink_orig.exe')
+  if not os.path.exists(link):
+    print 'link.exe not found at %s' % link
+    return 1
+
+  # Don't re-backup link.exe, so only copy link.exe to backup if it's
+  # not there already.
+  if not os.path.exists(link_backup):
+    try:
+      print 'Saving original link.exe...'
+      shutil.copyfile(link, link_backup)
+    except IOError:
+      print (('Wasn\'t able to back up %s to %s. '
+              'Not running with Administrator privileges?')
+              % (link, link_backup))
+      return 1
+
+  # Build supalink.exe but only if it's out of date.
+  cpptime = os.path.getmtime('supalink.cpp')
+  if (not os.path.exists('supalink.exe') or
+      cpptime > os.path.getmtime('supalink.exe')):
+    print 'Building supalink.exe...'
+    rc, out = run_with_vsvars('cl /nologo /Ox /Zi /W4 /WX /D_UNICODE /DUNICODE'
+                              ' /D_CRT_SECURE_NO_WARNINGS /EHsc supalink.cpp'
+                              ' /link /out:supalink.exe')
+    if rc:
+      print out
+      print 'Failed to build supalink.exe'
+      return 1
+
+  # Copy supalink into place if it's been updated since last time we ran.
+  exetime = os.path.getmtime('supalink.exe')
+  if exetime > os.path.getmtime(link):
+    print 'Copying supalink.exe over link.exe...'
+    try:
+      shutil.copyfile('supalink.exe', link)
+    except IOError:
+      print ('Wasn\'t able to copy supalink.exe over %s. '
+             'Not running with Administrator privileges?' % link)
+      return 1
+
+  _winreg.SetValue(_winreg.HKEY_CURRENT_USER,
+                   'Software\\Chromium\\supalink_installed',
+                   _winreg.REG_SZ,
+                   link_backup)
+
+  print 'Linker shim installed. Regenerate via gyp: "gclient runhooks".'
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())