Install link wrapper in runhooks, and turn incremental on by default

tools/supalink/install_supalink.py

Index: tools/supalink/install_supalink.py
diff --git a/tools/supalink/install_supalink.py b/tools/supalink/install_supalink.py
new file mode 100644
index 0000000000000000000000000000000000000000..621dea6bac77a1a4798521ba21361061b4765f89
--- /dev/null
+++ b/tools/supalink/install_supalink.py
@@ -0,0 +1,82 @@
+# 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
+
+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")

[bradn, 2011/09/06 23:56:19]

Please match the python style guide.

+    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)

[bradn, 2011/09/06 23:56:19]

The bots don't run with admin privs, so this won't work as a deploy strategy.

+        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\

[bradn, 2011/09/06 23:56:19]

Can we just check this program in?

+                /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)
+
+if __name__ == "__main__":
+    main()