webkit: expose webkit branch and revision number in about pages

- Change lastchange.py to work in other directories and to
  provide SVN URL.
- Use lastchange.py in place where we generate WebKit versioning
  info.
- Include branch@revision string in glue API.

BUG=41264
TEST=compiles

Review URL: http://codereview.chromium.org/6354014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72245 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 40 insertions, 4 deletions

diff --git a/webkit/build/webkit_version.py b/webkit/build/webkit_version.py
index 9f8fbab..5811072 100755
--- a/webkit/build/webkit_version.py
+++ b/webkit/build/webkit_version.py
@@ -12,6 +12,9 @@ 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
@@ -37,11 +40,43 @@ def ReadVersionFile(fname):
   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
@@ -49,12 +84,13 @@ def EmitVersionHeader(version_file, output_dir):
 
 #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__":