First pass at a script for extracting licensing info from third_party.

tools/licenses.py

Index: tools/licenses.py
diff --git a/tools/licenses.py b/tools/licenses.py
new file mode 100755
index 0000000000000000000000000000000000000000..d2262ebc3f8602ceb65a80d7b9bcd5a1772f42a4
--- /dev/null
+++ b/tools/licenses.py
@@ -0,0 +1,98 @@
+#!/usr/bin/python
+# Copyright (c) 2010 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.
+
+"""
+Utilities for checking and processing licensing information in third_party
+directories.
+"""
+
+import os
+
+
+class LicenseError(Exception):
+    """We raise this exception when a directory's licensing info isn't
+    fully filled out."""
+    pass
+
+
+def ParseDir(path):
+    """Examine a third_party/foo component and extract its metadata."""
+
+    # Try to find README.chromium.
+    readme_path = os.path.join(path, 'README.chromium')
+    if not os.path.exists(readme_path):
+        raise LicenseError("missing README.chromium")
+
+    # Parse metadata fields out of README.chromium.
+    metadata = {
+        "License File": None,  # Relative path to license text.
+        "Name": None,          # Short name (for header on about:credits).
+        "URL": None,           # Project home page.
+        }
+    for line in open(readme_path):
+        line = line.strip()
+        for key in metadata.keys():
+            field = key + ": "
+            if line.startswith(field):
+                metadata[key] = line[len(field):]
+
+    # Check that all expected metadata is present.
+    for key, value in metadata.iteritems():
+        if not value:
+            raise LicenseError("couldn't find '" + key + "' line "
+                               "in README.chromium")
+
+    # Check that the license file exists.
+    license_file = metadata["License File"]
+    license_path = os.path.join(path, license_file)
+    if not os.path.exists(license_path):
+        raise LicenseError("README.chromium mentions license file '" +
+                           license_file + "' that doesn't exist")
+
+    return metadata
+
+
+def ScanThirdPartyDirs(third_party_dirs):
+    """Scan a list of directories and report on any problems we find."""
+    errors = []
+    for path in sorted(third_party_dirs):
+        try:
+            metadata = ParseDir(path)
+        except LicenseError, e:
+            errors.append((path, e.args[0]))
+            continue
+        print path, "OK:", metadata["License File"]
+
+    for path, error in sorted(errors):
+        print path + ": " + error
+
+
+def FindThirdPartyDirs():
+    """Find all third_party directories underneath the current directory."""
+    skip_dirs = ('.svn', '.git',             # VCS metadata

[agl, 2010/03/18 21:27:05]

This could be a set() these days. (Unimportant)

+                 'out', 'Debug', 'Release',  # build files
+                 'layout_tests')             # lots of subdirs
+
+    third_party_dirs = []
+    for path, dirs, files in os.walk('.'):
+        path = path[len('./'):]  # Pretty up the path.
+
+        # Prune out directories we want to skip.
+        for skip in skip_dirs:

[agl, 2010/03/18 21:27:05]

If you make it a set, the order of these loops should be reversed.

+            if skip in dirs:
+                dirs.remove(skip)
+
+        if os.path.basename(path) == 'third_party':
+            third_party_dirs.extend([os.path.join(path, dir) for dir in dirs])
+            # Don't recurse into any subdirs from here.
+            dirs[:] = []
+            continue
+
+    return third_party_dirs
+
+
+if __name__ == '__main__':
+    third_party_dirs = FindThirdPartyDirs()
+    ScanThirdPartyDirs(third_party_dirs)