webkit: expose webkit branch and revision number in about pages

webkit/build/webkit_version.py

 #!/usr/bin/python
 # Copyright (c) 2006-2008 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.
 
 '''Reads the Webkit Version.xcconfig file looking for MAJOR_VERSION and
 MINOR_VERSION, emitting them into a webkit_version.h header file as
 WEBKIT_MAJOR_VERSION and WEBKIT_MINOR_VERSION macros.
 '''
 
 import os
 import re
 import sys
 
+sys.path.insert(0, '../../build/util')
+import lastchange
+
 def ReadVersionFile(fname):
   '''Reads the Webkit Version.xcconfig file looking for MAJOR_VERSION and
      MINOR_VERSION.  This function doesn't attempt to support the full syntax
      of xcconfig files.'''
   re_major = re.compile('MAJOR_VERSION\s*=\s*(\d+).*')
   re_minor = re.compile('MINOR_VERSION\s*=\s*(\d+).*')
   major = -1
   minor = -1
   f = open(fname, 'rb')
   line = "not empty"
   while line and not (major >= 0 and minor >= 0):
     line = f.readline()
     if major == -1:
       match = re_major.match(line)
       if match:
         major = int(match.group(1))
         continue
     if minor == -1:
       match = re_minor.match(line)
       if match:
         minor = int(match.group(1))
         continue
   assert(major >= 0 and minor >= 0)
   return (major, minor)
 
-def EmitVersionHeader(version_file, output_dir):
+def GetWebKitRevision(webkit_dir, version_file):
+  """Get the WebKit revision, in the form 'trunk@1234'."""
+
+  # "svn info" tells us what we want, but third_party/WebKit does *not*
+  # point at the upstream repo.  So instead we run svn info on the directory
+  # containing the versioning file (which is some subdirectory of WebKit),
+  # then strip that path back off of the resulting URL.
+  version_file_dir = os.path.dirname(version_file)
+  version_info = lastchange.FetchVersionInfo(
+      default_lastchange=None,
+      directory=os.path.join(webkit_dir, version_file_dir))
+
+  # Now compute the real WebKit URL by stripping off the version file
+  # directory from the URL we get out of version_info.
+  # Further, we want to strip off the "http://svn..." from the left.
+  # This is the root URL from the repository.
+  assert version_info.url.startswith(version_info.root)
+  assert version_info.url.endswith(version_file_dir)
+  webkit_url = version_info.url[len(version_info.root):-len(version_file_dir)]
+  webkit_url = webkit_url.strip('/')
+
+  return "%s@%s" % (webkit_url, version_info.revision)
+
+
+def EmitVersionHeader(webkit_dir, version_file, output_dir):
   '''Given webkit's version file, emit a header file that we can use from
   within webkit_glue.cc.
   '''
-  (major, minor) = ReadVersionFile(version_file)
+
+  # See .gypi file for discussion of this workaround for the version file.
+  assert version_file[0] == '/'
+  version_file = version_file[1:]
+
+  major, minor = ReadVersionFile(os.path.join(webkit_dir, version_file))
+
+  webkit_revision = GetWebKitRevision(webkit_dir, version_file)
+
   fname = os.path.join(output_dir, "webkit_version.h")
   f = open(fname, 'wb')
   template = """// webkit_version.h
 // generated from %s
 
 #define WEBKIT_VERSION_MAJOR %d
 #define WEBKIT_VERSION_MINOR %d
-""" % (version_file, major, minor)
+#define WEBKIT_SVN_REVISION "%s"
+""" % (version_file, major, minor, webkit_revision)
   f.write(template)
   f.close()
 
 def main():
-  EmitVersionHeader(sys.argv[1], sys.argv[2])
+  EmitVersionHeader(*sys.argv[1:])
 
 
 if __name__ == "__main__":
   main()