fs_config: android_id header generator

Implement an android_id generator that takes the data
acquired from parsing private/android_filesystem_config.h
and generates the android_id friendly name to uid mapping
for consumption in Bionic.

Test: That ls, ps, mkdir, chown, chgrp and services for built
in names work.
Change-Id: I1e55a401be0fca0ad162f8dc1e072e6afde7b927
Signed-off-by: William Roberts <william.c.roberts@intel.com>

tools/fs_config/fs_config_generator.py

@@ -16,6 +16,9 @@ import re
 import sys
 import textwrap
 
+# Keep the tool in one file to make it easy to run.
+# pylint: disable=too-many-lines
+
 
 # Lowercase generator used to be inline with @staticmethod.
 class generator(object):  # pylint: disable=invalid-name
@@ -360,7 +363,7 @@ class AIDHeaderParser(object):
         Returns:
             A list of AID() objects.
         """
-        return self._aid_name_to_value.values()
+        return self._aid_name_to_value
 
     @staticmethod
     def _convert_lst_to_tup(name, lst):
@@ -942,6 +945,58 @@ class FSConfigGen(BaseGenerator):
             print FSConfigGen._CLOSE_FILE_STRUCT
 
 
+@generator('aidarray')
+class AIDArrayGen(BaseGenerator):
+    """Generates the android_id static array."""
+
+    _GENERATED = ('/*\n'
+                  ' * THIS IS AN AUTOGENERATED FILE! DO NOT MODIFY!\n'
+                  ' */')
+
+    _INCLUDE = '#include <private/android_filesystem_config.h>'
+
+    _STRUCT_FS_CONFIG = textwrap.dedent("""
+                         struct android_id_info {
+                             const char *name;
+                             unsigned aid;
+                         };""")
+
+    _OPEN_ID_ARRAY = 'static const struct android_id_info android_ids[] = {'
+
+    _ID_ENTRY = '    { "%s", %s },'
+
+    _CLOSE_FILE_STRUCT = '};'
+
+    _COUNT = ('#define android_id_count \\\n'
+              '    (sizeof(android_ids) / sizeof(android_ids[0]))')
+
+    def add_opts(self, opt_group):
+
+        opt_group.add_argument(
+            'hdrfile', help='The android_filesystem_config.h'
+            'file to parse')
+
+    def __call__(self, args):
+
+        hdr = AIDHeaderParser(args['hdrfile'])
+
+        print AIDArrayGen._GENERATED
+        print
+        print AIDArrayGen._INCLUDE
+        print
+        print AIDArrayGen._STRUCT_FS_CONFIG
+        print
+        print AIDArrayGen._OPEN_ID_ARRAY
+
+        for name, aid in hdr.aids.iteritems():
+            print AIDArrayGen._ID_ENTRY % (name, aid.identifier)
+
+        print AIDArrayGen._CLOSE_FILE_STRUCT
+        print
+        print AIDArrayGen._COUNT
+        print
+
+
 def main():
     """Main entry point for execution."""