diff --git a/tools/fs_config/Android.mk b/tools/fs_config/Android.mk
index fb4a0c4e4..7d4d2715b 100644
--- a/tools/fs_config/Android.mk
+++ b/tools/fs_config/Android.mk
@@ -84,7 +84,7 @@ ifneq ($(TARGET_FS_CONFIG_GEN),)
 gen := $(local-generated-sources-dir)/$(ANDROID_FS_CONFIG_H)
 $(gen): PRIVATE_LOCAL_PATH := $(LOCAL_PATH)
 $(gen): PRIVATE_TARGET_FS_CONFIG_GEN := $(TARGET_FS_CONFIG_GEN)
-$(gen): PRIVATE_CUSTOM_TOOL = $(PRIVATE_LOCAL_PATH)/fs_config_generator.py $(PRIVATE_TARGET_FS_CONFIG_GEN) > $@
+$(gen): PRIVATE_CUSTOM_TOOL = $(PRIVATE_LOCAL_PATH)/fs_config_generator.py fsconfig $(PRIVATE_TARGET_FS_CONFIG_GEN) > $@
 $(gen): $(TARGET_FS_CONFIG_GEN) $(LOCAL_PATH)/fs_config_generator.py
 	$(transform-generated-source)
 
diff --git a/tools/fs_config/fs_config_generator.py b/tools/fs_config/fs_config_generator.py
index 6a16feacb..749af89c6 100755
--- a/tools/fs_config/fs_config_generator.py
+++ b/tools/fs_config/fs_config_generator.py
@@ -1,294 +1,662 @@
 #!/usr/bin/env python
+"""Generates config files for Android file system properties.
 
+This script is used for generating configuration files for configuring
+Android filesystem properties. Internally, its composed of a plug-able
+interface to support the understanding of new input and output parameters.
+
+Run the help for a list of supported plugins and their capabilities.
+
+Further documentation can be found in the README.
+"""
+
+import argparse
 import ConfigParser
 import re
 import sys
+import textwrap
 
 
-GENERATED = '''
-/*
- * THIS IS AN AUTOGENERATED FILE! DO NOT MODIFY
- */
-'''
+# Lowercase generator used to be inline with @staticmethod.
+class generator(object):  # pylint: disable=invalid-name
+    """A decorator class to add commandlet plugins.
 
-INCLUDE = '#include <private/android_filesystem_config.h>'
+    Used as a decorator to classes to add them to
+    the internal plugin interface. Plugins added
+    with @generator() are automatically added to
+    the command line.
 
-DEFINE_NO_DIRS = '#define NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS\n'
-DEFINE_NO_FILES = '#define NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_FILES\n'
+    For instance, to add a new generator
+    called foo and have it added just do this:
 
-DEFAULT_WARNING = '#warning No device-supplied android_filesystem_config.h, using empty default.'
+        @generator("foo")
+        class FooGen(object):
+            ...
+    """
+    _generators = {}
 
-NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS_ENTRY = '{ 00000, AID_ROOT,      AID_ROOT,      0, "system/etc/fs_config_dirs" },'
-NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_FILES_ENTRY = '{ 00000, AID_ROOT,      AID_ROOT,      0, "system/etc/fs_config_files" },'
+    def __init__(self, gen):
+        """
+        Args:
+            gen (str): The name of the generator to add.
 
-IFDEF_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS = '#ifdef NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS'
-ENDIF = '#endif'
+        Raises:
+            ValueError: If there is a similarly named generator already added.
 
-OPEN_FILE_STRUCT = 'static const struct fs_path_config android_device_files[] = {'
-OPEN_DIR_STRUCT = 'static const struct fs_path_config android_device_dirs[] = {'
-CLOSE_FILE_STRUCT = '};'
+        """
+        self._gen = gen
 
-GENERIC_DEFINE = "#define %s\t%s"
+        if gen in generator._generators:
+            raise ValueError('Duplicate generator name: ' + gen)
 
-FILE_COMMENT = '// Defined in file: \"%s\"'
+        generator._generators[gen] = None
 
-# from system/core/include/private/android_filesystem_config.h
-AID_OEM_RESERVED_RANGES = [
-    (2900, 2999),
-    (5000, 5999),
-]
+    def __call__(self, cls):
+
+        generator._generators[self._gen] = cls()
+        return cls
+
+    @staticmethod
+    def get():
+        """Gets the list of generators.
+
+        Returns:
+           The list of registered generators.
+        """
+        return generator._generators
 
 
-AID_MATCH = re.compile('AID_[a-zA-Z]+')
+class AID(object):
+    """This class represents an Android ID or an AID.
 
-def handle_aid(file_name, section_name, config, aids, seen_aids):
-    value = config.get(section_name, 'value')
+    Attributes:
+        identifier (str): The identifier name for a #define.
+        value (str) The User Id (uid) of the associate define.
+        found (str) The file it was found in, can be None.
+        normalized_value (str): Same as value, but base 10.
+    """
 
-    errmsg = '%s for: \"' + section_name + '" file: \"' + file_name + '\"'
+    def __init__(self, identifier, value, found):
+        """
+        Args:
+            identifier: The identifier name for a #define <identifier>.
+            value: The value of the AID, aka the uid.
+            found (str): The file found in, not required to be specified.
 
-    if not value:
-        raise Exception(errmsg % 'Found specified but unset "value"')
-
-    v = convert_int(value)
-    if not v:
-        raise Exception(errmsg % ('Invalid "value", not a number, got: \"%s\"' % value))
-
-    # Values must be within OEM range
-    if not any(lower <= v <= upper for (lower, upper) in AID_OEM_RESERVED_RANGES):
-        s = '"value" not in valid range %s, got: %s'
-        s = s % (str(AID_OEM_RESERVED_RANGES), value)
-        raise Exception(errmsg % s)
-
-    # use the normalized int value in the dict and detect
-    # duplicate definitions of the same vallue
-    v = str(v)
-    if v in seen_aids[1]:
-        # map of value to aid name
-        a = seen_aids[1][v]
-
-        # aid name to file
-        f = seen_aids[0][a]
-
-        s = 'Duplicate AID value "%s" found on AID: "%s".' % (value, seen_aids[1][v])
-        s += ' Previous found in file: "%s."' % f
-        raise Exception(errmsg % s)
-
-    seen_aids[1][v] = section_name
-
-    # Append a tuple of (AID_*, base10(value), str(value))
-    # We keep the str version of value so we can print that out in the
-    # generated header so investigating parties can identify parts.
-    # We store the base10 value for sorting, so everything is ascending
-    # later.
-    aids.append((file_name, section_name, v, value))
-
-def convert_int(num):
-
-        try:
-            if num.startswith('0x'):
-                return int(num, 16)
-            elif num.startswith('0b'):
-                return int(num, 2)
-            elif num.startswith('0'):
-                return int(num, 8)
-            else:
-                return int(num, 10)
-        except ValueError:
-            pass
-        return None
-
-def handle_path(file_name, section_name, config, files, dirs):
-
-            mode = config.get(section_name, 'mode')
-            user = config.get(section_name, 'user')
-            group = config.get(section_name, 'group')
-            caps = config.get(section_name, 'caps')
-
-            errmsg = 'Found specified but unset option: \"%s" in file: \"' + file_name + '\"'
-
-            if not mode:
-                raise Exception(errmsg % 'mode')
-
-            if not user:
-                raise Exception(errmsg % 'user')
-
-            if not group:
-                raise Exception(errmsg % 'group')
-
-            if not caps:
-                raise Exception(errmsg % 'caps')
-
-            caps = caps.split()
-
-            tmp = []
-            for x in caps:
-                if convert_int(x):
-                    tmp.append('(' + x + ')')
-                else:
-                    tmp.append('(1ULL << CAP_' + x.upper() + ')')
-
-            caps = tmp
-
-            path = '"' + section_name + '"'
-
-            if len(mode) == 3:
-                mode = '0' + mode
-
-            try:
-                int(mode, 8)
-            except:
-                raise Exception('Mode must be octal characters, got: "' + mode + '"')
-
-            if len(mode) != 4:
-                raise Exception('Mode must be 3 or 4 characters, got: "' + mode + '"')
+        Raises:
+            ValueError: if value is not a valid string number as processed by
+                int(x, 0)
+        """
+        self.identifier = identifier
+        self.value = value
+        self.found = found
+        self.normalized_value = str(int(value, 0))
 
 
-            caps = '|'.join(caps)
+class FSConfig(object):
+    """Represents a filesystem config array entry.
 
-            x = [ mode, user, group, caps, section_name ]
-            if section_name[-1] == '/':
-                dirs.append((file_name, x))
-            else:
-                files.append((file_name, x))
+    Represents a file system configuration entry for specifying
+    file system capabilities.
 
-def handle_dup(name, file_name, section_name, seen):
-        if section_name in seen:
-            dups = '"' + seen[section_name] + '" and '
-            dups += file_name
-            raise Exception('Duplicate ' + name + ' "' + section_name + '" found in files: ' + dups)
+    Attributes:
+        mode (str): The mode of the file or directory.
+        user (str): The uid or #define identifier (AID_SYSTEM)
+        group (str): The gid or #define identifier (AID_SYSTEM)
+        caps (str): The capability set.
+        filename (str): The file it was found in.
+    """
 
-def parse(file_name, files, dirs, aids, seen_paths, seen_aids):
+    def __init__(self, mode, user, group, caps, path, filename):
+        """
+        Args:
+            mode (str): The mode of the file or directory.
+            user (str): The uid or #define identifier (AID_SYSTEM)
+            group (str): The gid or #define identifier (AID_SYSTEM)
+            caps (str): The capability set as a list.
+            filename (str): The file it was found in.
+        """
+        self.mode = mode
+        self.user = user
+        self.group = group
+        self.caps = caps
+        self.path = path
+        self.filename = filename
+
+
+class FSConfigFileParser(object):
+    """Parses a config.fs ini format file.
+
+    This class is responsible for parsing the config.fs ini format files.
+    It collects and checks all the data in these files and makes it available
+    for consumption post processed.
+    """
+    # from system/core/include/private/android_filesystem_config.h
+    _AID_OEM_RESERVED_RANGES = [
+        (2900, 2999),
+        (5000, 5999),
+    ]
+
+    _AID_MATCH = re.compile('AID_[a-zA-Z]+')
+
+    def __init__(self, config_files):
+        """
+        Args:
+            config_files ([str]): The list of config.fs files to parse.
+                Note the filename is not important.
+        """
+
+        self._files = []
+        self._dirs = []
+        self._aids = []
+
+        self._seen_paths = {}
+        # (name to file, value to aid)
+        self._seen_aids = ({}, {})
+
+        self._config_files = config_files
+
+        for config_file in self._config_files:
+            self._parse(config_file)
+
+    def _parse(self, file_name):
+        """Parses and verifies config.fs files. Internal use only.
+
+        Args:
+            file_name (str): The config.fs (PythonConfigParser file format)
+                file to parse.
+
+        Raises:
+            Anything raised by ConfigParser.read()
+        """
+
+        # Separate config parsers for each file found. If you use
+        # read(filenames...) later files can override earlier files which is
+        # not what we want. Track state across files and enforce with
+        # _handle_dup(). Note, strict ConfigParser is set to true in
+        # Python >= 3.2, so in previous versions same file sections can
+        # override previous
+        # sections.
 
         config = ConfigParser.ConfigParser()
         config.read(file_name)
 
-        for s in config.sections():
+        for section in config.sections():
 
-            if AID_MATCH.match(s) and config.has_option(s, 'value'):
-                handle_dup('AID', file_name, s, seen_aids[0])
-                seen_aids[0][s] = file_name
-                handle_aid(file_name, s, config, aids, seen_aids)
+            if FSConfigFileParser._AID_MATCH.match(
+                    section) and config.has_option(section, 'value'):
+                FSConfigFileParser._handle_dup('AID', file_name, section,
+                                               self._seen_aids[0])
+                self._seen_aids[0][section] = file_name
+                self._handle_aid(file_name, section, config)
             else:
-                handle_dup('path', file_name, s, seen_paths)
-                seen_paths[s] = file_name
-                handle_path(file_name, s, config, files, dirs)
+                FSConfigFileParser._handle_dup('path', file_name, section,
+                                               self._seen_paths)
+                self._seen_paths[section] = file_name
+                self._handle_path(file_name, section, config)
 
-def generate(files, dirs, aids):
-    print GENERATED
-    print INCLUDE
-    print
+            # sort entries:
+            # * specified path before prefix match
+            # ** ie foo before f*
+            # * lexicographical less than before other
+            # ** ie boo before foo
+            # Given these paths:
+            # paths=['ac', 'a', 'acd', 'an', 'a*', 'aa', 'ac*']
+            # The sort order would be:
+            # paths=['a', 'aa', 'ac', 'acd', 'an', 'ac*', 'a*']
+            # Thus the fs_config tools will match on specified paths before
+            # attempting prefix, and match on the longest matching prefix.
+            self._files.sort(key=FSConfigFileParser._file_key)
 
-    are_dirs = len(dirs) > 0
-    are_files = len(files) > 0
-    are_aids = len(aids) > 0
+            # sort on value of (file_name, name, value, strvalue)
+            # This is only cosmetic so AIDS are arranged in ascending order
+            # within the generated file.
+            self._aids.sort(key=lambda item: item.normalized_value)
 
-    if are_aids:
-        for a in aids:
-            # use the preserved str value
-            print FILE_COMMENT % a[0]
-            print GENERIC_DEFINE % (a[1], a[2])
+    def _handle_aid(self, file_name, section_name, config):
+        """Verifies an AID entry and adds it to the aid list.
 
+        Calls sys.exit() with a descriptive message of the failure.
+
+        Args:
+            file_name (str): The filename of the config file being parsed.
+            section_name (str): The section name currently being parsed.
+            config (ConfigParser): The ConfigParser section being parsed that
+                the option values will come from.
+        """
+
+        def error_message(msg):
+            """Creates an error message with current parsing state."""
+            return '{} for: "{}" file: "{}"'.format(msg, section_name,
+                                                    file_name)
+
+        value = config.get(section_name, 'value')
+
+        if not value:
+            sys.exit(error_message('Found specified but unset "value"'))
+
+        try:
+            aid = AID(section_name, value, file_name)
+        except ValueError:
+            sys.exit(
+                error_message('Invalid "value", not aid number, got: \"%s\"' %
+                              value))
+
+        # Values must be within OEM range.
+        if not any(lower <= int(aid.value, 0) <= upper
+                   for (lower, upper
+                       ) in FSConfigFileParser._AID_OEM_RESERVED_RANGES):
+            emsg = '"value" not in valid range %s, got: %s'
+            emsg = emsg % (str(FSConfigFileParser._AID_OEM_RESERVED_RANGES),
+                           value)
+            sys.exit(error_message(emsg))
+
+        # use the normalized int value in the dict and detect
+        # duplicate definitions of the same value
+        if aid.normalized_value in self._seen_aids[1]:
+            # map of value to aid name
+            aid = self._seen_aids[1][aid.normalized_value]
+
+            # aid name to file
+            file_name = self._seen_aids[0][aid]
+
+            emsg = 'Duplicate AID value "%s" found on AID: "%s".' % (
+                value, self._seen_aids[1][aid.normalized_value])
+            emsg += ' Previous found in file: "%s."' % file_name
+            sys.exit(error_message(emsg))
+
+        self._seen_aids[1][aid.normalized_value] = section_name
+
+        # Append aid tuple of (AID_*, base10(value), _path(value))
+        # We keep the _path version of value so we can print that out in the
+        # generated header so investigating parties can identify parts.
+        # We store the base10 value for sorting, so everything is ascending
+        # later.
+        self._aids.append(aid)
+
+    def _handle_path(self, file_name, section_name, config):
+        """Add a file capability entry to the internal list.
+
+        Handles a file capability entry, verifies it, and adds it to
+        to the internal dirs or files list based on path. If it ends
+        with a / its a dir. Internal use only.
+
+        Calls sys.exit() on any validation error with message set.
+
+        Args:
+            file_name (str): The current name of the file being parsed.
+            section_name (str): The name of the section to parse.
+            config (str): The config parser.
+        """
+
+        mode = config.get(section_name, 'mode')
+        user = config.get(section_name, 'user')
+        group = config.get(section_name, 'group')
+        caps = config.get(section_name, 'caps')
+
+        errmsg = ('Found specified but unset option: \"%s" in file: \"' +
+                  file_name + '\"')
+
+        if not mode:
+            sys.exit(errmsg % 'mode')
+
+        if not user:
+            sys.exit(errmsg % 'user')
+
+        if not group:
+            sys.exit(errmsg % 'group')
+
+        if not caps:
+            sys.exit(errmsg % 'caps')
+
+        caps = caps.split()
+
+        tmp = []
+        for cap in caps:
+            try:
+                # test if string is int, if it is, use as is.
+                int(cap, 0)
+                tmp.append('(' + cap + ')')
+            except ValueError:
+                tmp.append('(1ULL << CAP_' + cap.upper() + ')')
+
+        caps = tmp
+
+        if len(mode) == 3:
+            mode = '0' + mode
+
+        try:
+            int(mode, 8)
+        except ValueError:
+            sys.exit('Mode must be octal characters, got: "%s"' % mode)
+
+        if len(mode) != 4:
+            sys.exit('Mode must be 3 or 4 characters, got: "%s"' % mode)
+
+        caps_str = '|'.join(caps)
+
+        entry = FSConfig(mode, user, group, caps_str, section_name, file_name)
+        if section_name[-1] == '/':
+            self._dirs.append(entry)
+        else:
+            self._files.append(entry)
+
+    @property
+    def files(self):
+        """Get the list of FSConfig file entries.
+
+        Returns:
+             a list of FSConfig() objects for file paths.
+        """
+        return self._files
+
+    @property
+    def dirs(self):
+        """Get the list of FSConfig dir entries.
+
+        Returns:
+            a list of FSConfig() objects for directory paths.
+        """
+        return self._dirs
+
+    @property
+    def aids(self):
+        """Get the list of AID entries.
+
+        Returns:
+            a list of AID() objects.
+        """
+        return self._aids
+
+    @staticmethod
+    def _file_key(fs_config):
+        """Used as the key paramter to sort.
+
+        This is used as a the function to the key parameter of a sort.
+        it wraps the string supplied in a class that implements the
+        appropriate __lt__ operator for the sort on path strings. See
+        StringWrapper class for more details.
+
+        Args:
+            fs_config (FSConfig): A FSConfig entry.
+
+        Returns:
+            A StringWrapper object
+        """
+
+        # Wrapper class for custom prefix matching strings
+        class StringWrapper(object):
+            """Wrapper class used for sorting prefix strings.
+
+            The algorithm is as follows:
+              - specified path before prefix match
+                - ie foo before f*
+              - lexicographical less than before other
+                - ie boo before foo
+
+            Given these paths:
+            paths=['ac', 'a', 'acd', 'an', 'a*', 'aa', 'ac*']
+            The sort order would be:
+            paths=['a', 'aa', 'ac', 'acd', 'an', 'ac*', 'a*']
+            Thus the fs_config tools will match on specified paths before
+            attempting prefix, and match on the longest matching prefix.
+            """
+
+            def __init__(self, path):
+                """
+                Args:
+                    path (str): the path string to wrap.
+                """
+                self.is_prefix = path[-1] == '*'
+                if self.is_prefix:
+                    self.path = path[:-1]
+                else:
+                    self.path = path
+
+            def __lt__(self, other):
+
+                # if were both suffixed the smallest string
+                # is 'bigger'
+                if self.is_prefix and other.is_prefix:
+                    result = len(self.path) > len(other.path)
+                # If I am an the suffix match, im bigger
+                elif self.is_prefix:
+                    result = False
+                # If other is the suffix match, he's bigger
+                elif other.is_prefix:
+                    result = True
+                # Alphabetical
+                else:
+                    result = self.path < other.path
+                return result
+
+        return StringWrapper(fs_config.path)
+
+    @staticmethod
+    def _handle_dup(name, file_name, section_name, seen):
+        """Tracks and detects duplicates. Internal use only.
+
+        Calls sys.exit() on a duplicate.
+
+        Args:
+            name (str): The name to use in the error reporting. The pretty
+                name for the section.
+            file_name (str): The file currently being parsed.
+            section_name (str): The name of the section. This would be path
+                or identifier depending on what's being parsed.
+            seen (dict): The dictionary of seen things to check against.
+        """
+        if section_name in seen:
+            dups = '"' + seen[section_name] + '" and '
+            dups += file_name
+            sys.exit('Duplicate %s "%s" found in files: %s' %
+                     (name, section_name, dups))
+
+        seen[section_name] = file_name
+
+
+class BaseGenerator(object):
+    """Interface for Generators.
+
+    Base class for generators, generators should implement
+    these method stubs.
+    """
+
+    def add_opts(self, opt_group):
+        """Used to add per-generator options to the command line.
+
+        Args:
+            opt_group (argument group object): The argument group to append to.
+                See the ArgParse docs for more details.
+        """
+
+        raise NotImplementedError("Not Implemented")
+
+    def __call__(self, args):
+        """This is called to do whatever magic the generator does.
+
+        Args:
+            args (dict): The arguments from ArgParse as a dictionary.
+                ie if you specified an argument of foo in add_opts, access
+                it via args['foo']
+        """
+
+        raise NotImplementedError("Not Implemented")
+
+
+@generator('fsconfig')
+class FSConfigGen(BaseGenerator):
+    """Generates the android_filesystem_config.h file.
+
+    Output is  used in generating fs_config_files and fs_config_dirs.
+    """
+
+    _GENERATED = textwrap.dedent("""\
+        /*
+         * THIS IS AN AUTOGENERATED FILE! DO NOT MODIFY
+         */
+        """)
+
+    _INCLUDE = '#include <private/android_filesystem_config.h>'
+
+    _DEFINE_NO_DIRS = '#define NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS'
+    _DEFINE_NO_FILES = '#define NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_FILES'
+
+    _DEFAULT_WARNING = (
+        '#warning No device-supplied android_filesystem_config.h,'
+        ' using empty default.')
+
+    # Long names.
+    # pylint: disable=invalid-name
+    _NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS_ENTRY = (
+        '{ 00000, AID_ROOT, AID_ROOT, 0,'
+        '"system/etc/fs_config_dirs" },')
+
+    _NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_FILES_ENTRY = (
+        '{ 00000, AID_ROOT, AID_ROOT, 0,'
+        '"system/etc/fs_config_files" },')
+
+    _IFDEF_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS = (
+        '#ifdef NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS')
+    # pylint: enable=invalid-name
+
+    _ENDIF = '#endif'
+
+    _OPEN_FILE_STRUCT = (
+        'static const struct fs_path_config android_device_files[] = {')
+
+    _OPEN_DIR_STRUCT = (
+        'static const struct fs_path_config android_device_dirs[] = {')
+
+    _CLOSE_FILE_STRUCT = '};'
+
+    _GENERIC_DEFINE = "#define %s\t%s"
+
+    _FILE_COMMENT = '// Defined in file: \"%s\"'
+
+    def add_opts(self, opt_group):
+
+        opt_group.add_argument(
+            'fsconfig', nargs='+', help='The list of fsconfig files to parse')
+
+    def __call__(self, args):
+
+        parser = FSConfigFileParser(args['fsconfig'])
+        FSConfigGen._generate(parser.files, parser.dirs, parser.aids)
+
+    @staticmethod
+    def _to_fs_entry(fs_config):
+        """
+        Given an FSConfig entry, converts it to a proper
+        array entry for the array entry.
+
+        { mode, user, group, caps, "path" },
+
+        Args:
+            fs_config (FSConfig): The entry to convert to
+                a valid C array entry.
+        """
+
+        # Get some short names
+        mode = fs_config.mode
+        user = fs_config.user
+        group = fs_config.group
+        fname = fs_config.filename
+        caps = fs_config.caps
+        path = fs_config.path
+
+        fmt = '{ %s, %s, %s, %s, "%s" },'
+
+        expanded = fmt % (mode, user, group, caps, path)
+
+        print FSConfigGen._FILE_COMMENT % fname
+        print '    ' + expanded
+
+    @staticmethod
+    def _generate(files, dirs, aids):
+        """Generates an OEM android_filesystem_config.h header file to stdout.
+
+        Args:
+            files ([FSConfig]): A list of FSConfig objects for file entries.
+            dirs ([FSConfig]): A list of FSConfig objects for directory
+                entries.
+            aids ([AIDS]): A list of AID objects for Android Id entries.
+        """
+        print FSConfigGen._GENERATED
+        print FSConfigGen._INCLUDE
         print
 
-    if not are_dirs:
-        print DEFINE_NO_DIRS
+        are_dirs = len(dirs) > 0
+        are_files = len(files) > 0
+        are_aids = len(aids) > 0
 
-    if not are_files:
-        print DEFINE_NO_FILES
+        if are_aids:
+            for aid in aids:
+                # use the preserved _path value
+                print FSConfigGen._FILE_COMMENT % aid.found
+                print FSConfigGen._GENERIC_DEFINE % (aid.identifier, aid.value)
 
-    if not are_files and not are_dirs and not are_aids:
-        print DEFAULT_WARNING
-        return
-
-    if are_files:
-        print OPEN_FILE_STRUCT
-        for tup in files:
-            f = tup[0]
-            c = tup[1]
-            c[4] = '"' + c[4] + '"'
-            c = '{ ' + '    ,'.join(c) + ' },'
-            print FILE_COMMENT % f
-            print '    ' + c
+            print
 
         if not are_dirs:
-            print IFDEF_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS
-            print '    ' + NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS_ENTRY
-            print ENDIF
-        print CLOSE_FILE_STRUCT
+            print FSConfigGen._DEFINE_NO_DIRS + '\n'
 
-    if are_dirs:
-        print OPEN_DIR_STRUCT
-        for d in dirs:
-            f[4] = '"' + f[4] + '"'
-            d = '{ ' + '    ,'.join(d) + ' },'
-            print '    ' + d
+        if not are_files:
+            print FSConfigGen._DEFINE_NO_FILES + '\n'
 
-        print CLOSE_FILE_STRUCT
+        if not are_files and not are_dirs and not are_aids:
+            print FSConfigGen._DEFAULT_WARNING
+            return
 
-def file_key(x):
+        if are_files:
+            print FSConfigGen._OPEN_FILE_STRUCT
+            for fs_config in files:
+                FSConfigGen._to_fs_entry(fs_config)
 
-    # Wrapper class for custom prefix matching strings
-    class S(object):
-        def __init__(self, str):
+            if not are_dirs:
+                print FSConfigGen._IFDEF_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS
+                print(
+                    '    ' +
+                    FSConfigGen._NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS_ENTRY)
+                print FSConfigGen._ENDIF
+            print FSConfigGen._CLOSE_FILE_STRUCT
 
-            self.orig = str
-            self.is_prefix = str[-1] == '*'
-            if self.is_prefix:
-                self.str = str[:-1]
-            else:
-                self.str = str
+        if are_dirs:
+            print FSConfigGen._OPEN_DIR_STRUCT
+            for dir_entry in dirs:
+                FSConfigGen._to_fs_entry(dir_entry)
 
-        def __lt__(self, other):
+            print FSConfigGen._CLOSE_FILE_STRUCT
 
-            # if were both suffixed the smallest string
-            # is 'bigger'
-            if self.is_prefix and other.is_prefix:
-                b = len(self.str) > len(other.str)
-            # If I am an the suffix match, im bigger
-            elif self.is_prefix:
-                b = False
-            # If other is the suffix match, he's bigger
-            elif other.is_prefix:
-                b = True
-            # Alphabetical
-            else:
-                b = self.str < other.str
-            return b
-
-    return S(x[4])
 
 def main():
+    """Main entry point for execution."""
 
-    files = []
-    dirs = []
-    aids = []
-    seen_paths = {}
+    opt_parser = argparse.ArgumentParser(
+        description='A tool for parsing fsconfig config files and producing' +
+        'digestable outputs.')
+    subparser = opt_parser.add_subparsers(help='generators')
 
-    # (name to file, value to aid)
-    seen_aids = ({}, {})
+    gens = generator.get()
 
-    for x in sys.argv[1:]:
-        parse(x, files, dirs, aids, seen_paths, seen_aids)
+    # for each gen, instantiate and add them as an option
+    for name, gen in gens.iteritems():
 
-    # sort entries:
-    # * specified path before prefix match
-    # ** ie foo before f*
-    # * lexicographical less than before other
-    # ** ie boo before foo
-    # Given these paths:
-    # paths=['ac', 'a', 'acd', 'an', 'a*', 'aa', 'ac*']
-    # The sort order would be:
-    # paths=['a', 'aa', 'ac', 'acd', 'an', 'ac*', 'a*']
-    # Thus the fs_config tools will match on specified paths before attempting
-    # prefix, and match on the longest matching prefix.
-    files.sort(key= lambda x: file_key(x[1]))
+        generator_option_parser = subparser.add_parser(name, help=gen.__doc__)
+        generator_option_parser.set_defaults(which=name)
 
-    # sort on value of (file_name, name, value, strvalue)
-    # This is only cosmetic so AIDS are arranged in ascending order
-    # within the generated file.
-    aids.sort(key=lambda x: x[2])
+        opt_group = generator_option_parser.add_argument_group(name +
+                                                               ' options')
+        gen.add_opts(opt_group)
+
+    args = opt_parser.parse_args()
+
+    args_as_dict = vars(args)
+    which = args_as_dict['which']
+    del args_as_dict['which']
+
+    gens[which](args_as_dict)
 
-    generate(files, dirs, aids)
 
 if __name__ == '__main__':
     main()
diff --git a/tools/fs_config/pylintrc b/tools/fs_config/pylintrc
new file mode 100644
index 000000000..3e44870af
--- /dev/null
+++ b/tools/fs_config/pylintrc
@@ -0,0 +1,5 @@
+[MESSAGES CONTROL]
+disable=fixme,design,locally-disabled,too-many-lines
+
+[VARIABLES]
+dummy-variables-rgx=_|dummy