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..d3712585e2b3ca9c0e4c9d07268753921469eff6
--- /dev/null
+++ b/tools/win/supalink/install_supalink.py
@@ -0,0 +1,90 @@
+# 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 _winreg
+
+VSVARS_PATH = 'C:\\Program Files (x86)\\Microsoft Visual Studio 9.0\
+\\Common7\\Tools\\vsvars32.bat'
+
+def run_with_vsvars(cmd):
+  f = open('temp.bat', 'w')
+  f.write('@echo off\n')
+  f.write('call "%s"\n' % VSVARS_PATH)
+  f.write(cmd + '\n')
+  f.close()
+  p = subprocess.Popen(['temp.bat'], shell=True, stdout=subprocess.PIPE)
+  out, err = p.communicate()
+  os.unlink('temp.bat')
+  out = out.replace('\r', '')
+  return p.returncode, out
+
+
+def get_vc_dir():
+  rc, out = run_with_vsvars('echo VCINSTALLDIR=%VCINSTALLDIR%')
+  for line in out.split('\n'):
+    if line.startswith('VCINSTALLDIR='):
+      return line[len('VCINSTALLDIR='):]
+  raise SystemExit('Couldn\'t get VCINSTALLDIR. Run vsvars32.bat?')
+
+def main():
+  if 'VCINSTALLDIR' not in os.environ:
+    vcdir = get_vc_dir()
+    os.environ['PATH'] += ';' + os.path.join(vcdir, 'bin') + \
+                ';' + os.path.join(vcdir, '../Common7/IDE')
+  else:
+    vcdir = os.environ['VCINSTALLDIR']
+
+  # 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):
+    raise SystemExit('link.exe not found at %s' % link)
+
+  # 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:
+      raise SystemExit('Wasn\'t able to back up %s to %s.\
+ Not running with Administrator privileges?' % (link, link_backup))
+
+  # Build supalink.exe but only if it's out of date.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_CRT_SECURE_NO_WARNINGS /EHsc supalink.cpp\
+        /link /out:supalink.exe')
+    if rc != 0:
+      print out
+      raise SystemExit('Failed to build supalink.exe')
+
+  # 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:
+      raise SystemExit('Wasn\'t able to copy supalink.exe over %s.\
+ Not running with Administrator privileges?' % link)
+
+  _winreg.SetValue(_winreg.HKEY_CURRENT_USER,
+           'Software\\Chromium\\supalink_installed',
+           _winreg.REG_SZ,
+           link_backup)
+
+  print 'Linker shim installed. Regenerate via gyp: "gclient runhooks".'
+
+if __name__ == '__main__':
+  main()