moveconfig.py

#!/usr/bin/env python2
#
# Author: Masahiro Yamada <yamada.masahiro@socionext.com>
#
# SPDX-License-Identifier:	GPL-2.0+
#

"""
Move config options from headers to defconfig files.

Since Kconfig was introduced to U-Boot, we have worked on moving
config options from headers to Kconfig (defconfig).

This tool intends to help this tremendous work.


Usage
-----

First, you must edit the Kconfig to add the menu entries for the configs
you are moving.

And then run this tool giving CONFIG names you want to move.
For example, if you want to move CONFIG_CMD_USB and CONFIG_SYS_TEXT_BASE,
simply type as follows:

  $ tools/moveconfig.py CONFIG_CMD_USB CONFIG_SYS_TEXT_BASE

The tool walks through all the defconfig files and move the given CONFIGs.

The log is also displayed on the terminal.

The log is printed for each defconfig as follows:

<defconfig_name>
    <action1>
    <action2>
    <action3>
    ...

<defconfig_name> is the name of the defconfig.

<action*> shows what the tool did for that defconfig.
It looks like one of the following:

 - Move 'CONFIG_... '
   This config option was moved to the defconfig

 - CONFIG_... is not defined in Kconfig.  Do nothing.
   The entry for this CONFIG was not found in Kconfig.  The option is not
   defined in the config header, either.  So, this case can be just skipped.

 - CONFIG_... is not defined in Kconfig (suspicious).  Do nothing.
   This option is defined in the config header, but its entry was not found
   in Kconfig.
   There are two common cases:
     - You forgot to create an entry for the CONFIG before running
       this tool, or made a typo in a CONFIG passed to this tool.
     - The entry was hidden due to unmet 'depends on'.
   The tool does not know if the result is reasonable, so please check it
   manually.

 - 'CONFIG_...' is the same as the define in Kconfig.  Do nothing.
   The define in the config header matched the one in Kconfig.
   We do not need to touch it.

 - Compiler is missing.  Do nothing.
   The compiler specified for this architecture was not found
   in your PATH environment.
   (If -e option is passed, the tool exits immediately.)

 - Failed to process.
   An error occurred during processing this defconfig.  Skipped.
   (If -e option is passed, the tool exits immediately on error.)

Finally, you will be asked, Clean up headers? [y/n]:

If you say 'y' here, the unnecessary config defines are removed
from the config headers (include/configs/*.h).
It just uses the regex method, so you should not rely on it.
Just in case, please do 'git diff' to see what happened.


How does it work?
-----------------

This tool runs configuration and builds include/autoconf.mk for every
defconfig.  The config options defined in Kconfig appear in the .config
file (unless they are hidden because of unmet dependency.)
On the other hand, the config options defined by board headers are seen
in include/autoconf.mk.  The tool looks for the specified options in both
of them to decide the appropriate action for the options.  If the given
config option is found in the .config, but its value does not match the
one from the board header, the config option in the .config is replaced
with the define in the board header.  Then, the .config is synced by
"make savedefconfig" and the defconfig is updated with it.

For faster processing, this tool handles multi-threading.  It creates
separate build directories where the out-of-tree build is run.  The
temporary build directories are automatically created and deleted as
needed.  The number of threads are chosen based on the number of the CPU
cores of your system although you can change it via -j (--jobs) option.


Toolchains
----------

Appropriate toolchain are necessary to generate include/autoconf.mk
for all the architectures supported by U-Boot.  Most of them are available
at the kernel.org site, some are not provided by kernel.org. This tool uses
the same tools as buildman, so see that tool for setup (e.g. --fetch-arch).


Tips and trips
--------------

To sync only X86 defconfigs:

   ./tools/moveconfig.py -s -d <(grep -l X86 configs/*)

or:

   grep -l X86 configs/* | ./tools/moveconfig.py -s -d -

To process CONFIG_CMD_FPGAD only for a subset of configs based on path match:

   ls configs/{hrcon*,iocon*,strider*} | \
       ./tools/moveconfig.py -Cy CONFIG_CMD_FPGAD -d -


Finding implied CONFIGs
-----------------------

Some CONFIG options can be implied by others and this can help to reduce
the size of the defconfig files. For example, CONFIG_X86 implies
CONFIG_CMD_IRQ, so we can put 'imply CMD_IRQ' under 'config X86' and
all x86 boards will have that option, avoiding adding CONFIG_CMD_IRQ to
each of the x86 defconfig files.

This tool can help find such configs. To use it, first build a database:

    ./tools/moveconfig.py -b

Then try to query it:

    ./tools/moveconfig.py -i CONFIG_CMD_IRQ
    CONFIG_CMD_IRQ found in 311/2384 defconfigs
    44 : CONFIG_SYS_FSL_ERRATUM_IFC_A002769
    41 : CONFIG_SYS_FSL_ERRATUM_A007075
    31 : CONFIG_SYS_FSL_DDR_VER_44
    28 : CONFIG_ARCH_P1010
    28 : CONFIG_SYS_FSL_ERRATUM_P1010_A003549
    28 : CONFIG_SYS_FSL_ERRATUM_SEC_A003571
    28 : CONFIG_SYS_FSL_ERRATUM_IFC_A003399
    25 : CONFIG_SYS_FSL_ERRATUM_A008044
    22 : CONFIG_ARCH_P1020
    21 : CONFIG_SYS_FSL_DDR_VER_46
    20 : CONFIG_MAX_PIRQ_LINKS
    20 : CONFIG_HPET_ADDRESS
    20 : CONFIG_X86
    20 : CONFIG_PCIE_ECAM_SIZE
    20 : CONFIG_IRQ_SLOT_COUNT
    20 : CONFIG_I8259_PIC
    20 : CONFIG_CPU_ADDR_BITS
    20 : CONFIG_RAMBASE
    20 : CONFIG_SYS_FSL_ERRATUM_A005871
    20 : CONFIG_PCIE_ECAM_BASE
    20 : CONFIG_X86_TSC_TIMER
    20 : CONFIG_I8254_TIMER
    20 : CONFIG_CMD_GETTIME
    19 : CONFIG_SYS_FSL_ERRATUM_A005812
    18 : CONFIG_X86_RUN_32BIT
    17 : CONFIG_CMD_CHIP_CONFIG
    ...

This shows a list of config options which might imply CONFIG_CMD_EEPROM along
with how many defconfigs they cover. From this you can see that CONFIG_X86
implies CONFIG_CMD_EEPROM. Therefore, instead of adding CONFIG_CMD_EEPROM to
the defconfig of every x86 board, you could add a single imply line to the
Kconfig file:

    config X86
        bool "x86 architecture"
        ...
        imply CMD_EEPROM

That will cover 20 defconfigs. Many of the options listed are not suitable as
they are not related. E.g. it would be odd for CONFIG_CMD_GETTIME to imply
CMD_EEPROM.

Using this search you can reduce the size of moveconfig patches.

You can automatically add 'imply' statements in the Kconfig with the -a
option:

    ./tools/moveconfig.py -s -i CONFIG_SCSI \
            -a CONFIG_ARCH_LS1021A,CONFIG_ARCH_LS1043A

This will add 'imply SCSI' to the two CONFIG options mentioned, assuming that
the database indicates that they do actually imply CONFIG_SCSI and do not
already have an 'imply SCSI'.

The output shows where the imply is added:

   18 : CONFIG_ARCH_LS1021A       arch/arm/cpu/armv7/ls102xa/Kconfig:1
   13 : CONFIG_ARCH_LS1043A       arch/arm/cpu/armv8/fsl-layerscape/Kconfig:11
   12 : CONFIG_ARCH_LS1046A       arch/arm/cpu/armv8/fsl-layerscape/Kconfig:31

The first number is the number of boards which can avoid having a special
CONFIG_SCSI option in their defconfig file if this 'imply' is added.
The location at the right is the Kconfig file and line number where the config
appears. For example, adding 'imply CONFIG_SCSI' to the 'config ARCH_LS1021A'
in arch/arm/cpu/armv7/ls102xa/Kconfig at line 1 will help 18 boards to reduce
the size of their defconfig files.

If you want to add an 'imply' to every imply config in the list, you can use

    ./tools/moveconfig.py -s -i CONFIG_SCSI -a all

To control which ones are displayed, use -I <list> where list is a list of
options (use '-I help' to see possible options and their meaning).

To skip showing you options that already have an 'imply' attached, use -A.

When you have finished adding 'imply' options you can regenerate the
defconfig files for affected boards with something like:

    git show --stat | ./tools/moveconfig.py -s -d -

This will regenerate only those defconfigs changed in the current commit.
If you start with (say) 100 defconfigs being changed in the commit, and add
a few 'imply' options as above, then regenerate, hopefully you can reduce the
number of defconfigs changed in the commit.


Available options
-----------------

 -c, --color
   Surround each portion of the log with escape sequences to display it
   in color on the terminal.

 -C, --commit
   Create a git commit with the changes when the operation is complete. A
   standard commit message is used which may need to be edited.

 -d, --defconfigs
  Specify a file containing a list of defconfigs to move.  The defconfig
  files can be given with shell-style wildcards. Use '-' to read from stdin.

 -n, --dry-run
   Perform a trial run that does not make any changes.  It is useful to
   see what is going to happen before one actually runs it.

 -e, --exit-on-error
   Exit immediately if Make exits with a non-zero status while processing
   a defconfig file.

 -s, --force-sync
   Do "make savedefconfig" forcibly for all the defconfig files.
   If not specified, "make savedefconfig" only occurs for cases
   where at least one CONFIG was moved.

 -S, --spl
   Look for moved config options in spl/include/autoconf.mk instead of
   include/autoconf.mk.  This is useful for moving options for SPL build
   because SPL related options (mostly prefixed with CONFIG_SPL_) are
   sometimes blocked by CONFIG_SPL_BUILD ifdef conditionals.

 -H, --headers-only
   Only cleanup the headers; skip the defconfig processing

 -j, --jobs
   Specify the number of threads to run simultaneously.  If not specified,
   the number of threads is the same as the number of CPU cores.

 -r, --git-ref
   Specify the git ref to clone for building the autoconf.mk. If unspecified
   use the CWD. This is useful for when changes to the Kconfig affect the
   default values and you want to capture the state of the defconfig from
   before that change was in effect. If in doubt, specify a ref pre-Kconfig
   changes (use HEAD if Kconfig changes are not committed). Worst case it will
   take a bit longer to run, but will always do the right thing.

 -v, --verbose
   Show any build errors as boards are built

 -y, --yes
   Instead of prompting, automatically go ahead with all operations. This
   includes cleaning up headers, CONFIG_SYS_EXTRA_OPTIONS, the config whitelist
   and the README.

To see the complete list of supported options, run

  $ tools/moveconfig.py -h

"""

import collections
import copy
import difflib
import filecmp
import fnmatch
import glob
import multiprocessing
import optparse
import os
import Queue
import re
import shutil
import subprocess
import sys
import tempfile
import threading
import time

sys.path.append(os.path.join(os.path.dirname(__file__), 'buildman'))
sys.path.append(os.path.join(os.path.dirname(__file__), 'patman'))
import bsettings
import kconfiglib
import toolchain

SHOW_GNU_MAKE = 'scripts/show-gnu-make'
SLEEP_TIME=0.03

STATE_IDLE = 0
STATE_DEFCONFIG = 1
STATE_AUTOCONF = 2
STATE_SAVEDEFCONFIG = 3

ACTION_MOVE = 0
ACTION_NO_ENTRY = 1
ACTION_NO_ENTRY_WARN = 2
ACTION_NO_CHANGE = 3

COLOR_BLACK        = '0;30'
COLOR_RED          = '0;31'
COLOR_GREEN        = '0;32'
COLOR_BROWN        = '0;33'
COLOR_BLUE         = '0;34'
COLOR_PURPLE       = '0;35'
COLOR_CYAN         = '0;36'
COLOR_LIGHT_GRAY   = '0;37'
COLOR_DARK_GRAY    = '1;30'
COLOR_LIGHT_RED    = '1;31'
COLOR_LIGHT_GREEN  = '1;32'
COLOR_YELLOW       = '1;33'
COLOR_LIGHT_BLUE   = '1;34'
COLOR_LIGHT_PURPLE = '1;35'
COLOR_LIGHT_CYAN   = '1;36'
COLOR_WHITE        = '1;37'

AUTO_CONF_PATH = 'include/config/auto.conf'
CONFIG_DATABASE = 'moveconfig.db'

CONFIG_LEN = len('CONFIG_')

### helper functions ###
def get_devnull():
    """Get the file object of '/dev/null' device."""
    try:
        devnull = subprocess.DEVNULL # py3k
    except AttributeError:
        devnull = open(os.devnull, 'wb')
    return devnull

def check_top_directory():
    """Exit if we are not at the top of source directory."""
    for f in ('README', 'Licenses'):
        if not os.path.exists(f):
            sys.exit('Please run at the top of source directory.')

def check_clean_directory():
    """Exit if the source tree is not clean."""
    for f in ('.config', 'include/config'):
        if os.path.exists(f):
            sys.exit("source tree is not clean, please run 'make mrproper'")

def get_make_cmd():
    """Get the command name of GNU Make.

    U-Boot needs GNU Make for building, but the command name is not
    necessarily "make". (for example, "gmake" on FreeBSD).
    Returns the most appropriate command name on your system.
    """
    process = subprocess.Popen([SHOW_GNU_MAKE], stdout=subprocess.PIPE)
    ret = process.communicate()
    if process.returncode:
        sys.exit('GNU Make not found')
    return ret[0].rstrip()

def get_matched_defconfig(line):
    """Get the defconfig files that match a pattern

    Args:
        line: Path or filename to match, e.g. 'configs/snow_defconfig' or
            'k2*_defconfig'. If no directory is provided, 'configs/' is
            prepended

    Returns:
        a list of matching defconfig files
    """
    dirname = os.path.dirname(line)
    if dirname:
        pattern = line
    else:
        pattern = os.path.join('configs', line)
    return glob.glob(pattern) + glob.glob(pattern + '_defconfig')

def get_matched_defconfigs(defconfigs_file):
    """Get all the defconfig files that match the patterns in a file.

    Args:
        defconfigs_file: File containing a list of defconfigs to process, or
            '-' to read the list from stdin

    Returns:
        A list of paths to defconfig files, with no duplicates
    """
    defconfigs = []
    if defconfigs_file == '-':
        fd = sys.stdin
        defconfigs_file = 'stdin'
    else:
        fd = open(defconfigs_file)
    for i, line in enumerate(fd):
        line = line.strip()
        if not line:
            continue # skip blank lines silently
        if ' ' in line:
            line = line.split(' ')[0]  # handle 'git log' input
        matched = get_matched_defconfig(line)
        if not matched:
            print >> sys.stderr, "warning: %s:%d: no defconfig matched '%s'" % \
                                                 (defconfigs_file, i + 1, line)

        defconfigs += matched

    # use set() to drop multiple matching
    return [ defconfig[len('configs') + 1:]  for defconfig in set(defconfigs) ]

def get_all_defconfigs():
    """Get all the defconfig files under the configs/ directory."""
    defconfigs = []
    for (dirpath, dirnames, filenames) in os.walk('configs'):
        dirpath = dirpath[len('configs') + 1:]
        for filename in fnmatch.filter(filenames, '*_defconfig'):
            defconfigs.append(os.path.join(dirpath, filename))

    return defconfigs

def color_text(color_enabled, color, string):
    """Return colored string."""
    if color_enabled:
        # LF should not be surrounded by the escape sequence.
        # Otherwise, additional whitespace or line-feed might be printed.
        return '\n'.join([ '\033[' + color + 'm' + s + '\033[0m' if s else ''
                           for s in string.split('\n') ])
    else:
        return string

def show_diff(a, b, file_path, color_enabled):
    """Show unidified diff.

    Arguments:
      a: A list of lines (before)
      b: A list of lines (after)
      file_path: Path to the file
      color_enabled: Display the diff in color
    """

    diff = difflib.unified_diff(a, b,
                                fromfile=os.path.join('a', file_path),
                                tofile=os.path.join('b', file_path))

    for line in diff:
        if line[0] == '-' and line[1] != '-':
            print color_text(color_enabled, COLOR_RED, line),
        elif line[0] == '+' and line[1] != '+':
            print color_text(color_enabled, COLOR_GREEN, line),
        else:
            print line,

def extend_matched_lines(lines, matched, pre_patterns, post_patterns, extend_pre,
                         extend_post):
    """Extend matched lines if desired patterns are found before/after already
    matched lines.

    Arguments:
      lines: A list of lines handled.
      matched: A list of line numbers that have been already matched.
               (will be updated by this function)
      pre_patterns: A list of regular expression that should be matched as
                    preamble.
      post_patterns: A list of regular expression that should be matched as
                     postamble.
      extend_pre: Add the line number of matched preamble to the matched list.
      extend_post: Add the line number of matched postamble to the matched list.
    """
    extended_matched = []

    j = matched[0]

    for i in matched:
        if i == 0 or i < j:
            continue
        j = i
        while j in matched:
            j += 1
        if j >= len(lines):
            break

        for p in pre_patterns:
            if p.search(lines[i - 1]):
                break
        else:
            # not matched
            continue

        for p in post_patterns:
            if p.search(lines[j]):
                break
        else:
            # not matched
            continue

        if extend_pre:
            extended_matched.append(i - 1)
        if extend_post:
            extended_matched.append(j)

    matched += extended_matched
    matched.sort()

def confirm(options, prompt):
    if not options.yes:
        while True:
            choice = raw_input('{} [y/n]: '.format(prompt))
            choice = choice.lower()
            print choice
            if choice == 'y' or choice == 'n':
                break

        if choice == 'n':
            return False

    return True

def cleanup_one_header(header_path, patterns, options):
    """Clean regex-matched lines away from a file.

    Arguments:
      header_path: path to the cleaned file.
      patterns: list of regex patterns.  Any lines matching to these
                patterns are deleted.
      options: option flags.
    """
    with open(header_path) as f:
        lines = f.readlines()

    matched = []
    for i, line in enumerate(lines):
        if i - 1 in matched and lines[i - 1][-2:] == '\\\n':
            matched.append(i)
            continue
        for pattern in patterns:
            if pattern.search(line):
                matched.append(i)
                break

    if not matched:
        return

    # remove empty #ifdef ... #endif, successive blank lines
    pattern_if = re.compile(r'#\s*if(def|ndef)?\W') #  #if, #ifdef, #ifndef
    pattern_elif = re.compile(r'#\s*el(if|se)\W')   #  #elif, #else
    pattern_endif = re.compile(r'#\s*endif\W')      #  #endif
    pattern_blank = re.compile(r'^\s*$')            #  empty line

    while True:
        old_matched = copy.copy(matched)
        extend_matched_lines(lines, matched, [pattern_if],
                             [pattern_endif], True, True)
        extend_matched_lines(lines, matched, [pattern_elif],
                             [pattern_elif, pattern_endif], True, False)
        extend_matched_lines(lines, matched, [pattern_if, pattern_elif],
                             [pattern_blank], False, True)
        extend_matched_lines(lines, matched, [pattern_blank],
                             [pattern_elif, pattern_endif], True, False)
        extend_matched_lines(lines, matched, [pattern_blank],
                             [pattern_blank], True, False)
        if matched == old_matched:
            break

    tolines = copy.copy(lines)

    for i in reversed(matched):
        tolines.pop(i)

    show_diff(lines, tolines, header_path, options.color)

    if options.dry_run:
        return

    with open(header_path, 'w') as f:
        for line in tolines:
            f.write(line)

def cleanup_headers(configs, options):
    """Delete config defines from board headers.

    Arguments:
      configs: A list of CONFIGs to remove.
      options: option flags.
    """
    if not confirm(options, 'Clean up headers?'):
        return

    patterns = []
    for config in configs:
        patterns.append(re.compile(r'#\s*define\s+%s\W' % config))
        patterns.append(re.compile(r'#\s*undef\s+%s\W' % config))

    for dir in 'include', 'arch', 'board':
        for (dirpath, dirnames, filenames) in os.walk(dir):
            if dirpath == os.path.join('include', 'generated'):
                continue
            for filename in filenames:
                if not fnmatch.fnmatch(filename, '*~'):
                    cleanup_one_header(os.path.join(dirpath, filename),
                                       patterns, options)

def cleanup_one_extra_option(defconfig_path, configs, options):
    """Delete config defines in CONFIG_SYS_EXTRA_OPTIONS in one defconfig file.

    Arguments:
      defconfig_path: path to the cleaned defconfig file.
      configs: A list of CONFIGs to remove.
      options: option flags.
    """

    start = 'CONFIG_SYS_EXTRA_OPTIONS="'
    end = '"\n'

    with open(defconfig_path) as f:
        lines = f.readlines()

    for i, line in enumerate(lines):
        if line.startswith(start) and line.endswith(end):
            break
    else:
        # CONFIG_SYS_EXTRA_OPTIONS was not found in this defconfig
        return

    old_tokens = line[len(start):-len(end)].split(',')
    new_tokens = []

    for token in old_tokens:
        pos = token.find('=')
        if not (token[:pos] if pos >= 0 else token) in configs:
            new_tokens.append(token)

    if new_tokens == old_tokens:
        return

    tolines = copy.copy(lines)

    if new_tokens:
        tolines[i] = start + ','.join(new_tokens) + end
    else:
        tolines.pop(i)

    show_diff(lines, tolines, defconfig_path, options.color)

    if options.dry_run:
        return

    with open(defconfig_path, 'w') as f:
        for line in tolines:
            f.write(line)

def cleanup_extra_options(configs, options):
    """Delete config defines in CONFIG_SYS_EXTRA_OPTIONS in defconfig files.

    Arguments:
      configs: A list of CONFIGs to remove.
      options: option flags.
    """
    if not confirm(options, 'Clean up CONFIG_SYS_EXTRA_OPTIONS?'):
        return

    configs = [ config[len('CONFIG_'):] for config in configs ]

    defconfigs = get_all_defconfigs()

    for defconfig in defconfigs:
        cleanup_one_extra_option(os.path.join('configs', defconfig), configs,
                                 options)

def cleanup_whitelist(configs, options):
    """Delete config whitelist entries

    Arguments:
      configs: A list of CONFIGs to remove.
      options: option flags.
    """
    if not confirm(options, 'Clean up whitelist entries?'):
        return

    with open(os.path.join('scripts', 'config_whitelist.txt')) as f:
        lines = f.readlines()

    lines = [x for x in lines if x.strip() not in configs]

    with open(os.path.join('scripts', 'config_whitelist.txt'), 'w') as f:
        f.write(''.join(lines))

def find_matching(patterns, line):
    for pat in patterns:
        if pat.search(line):
            return True
    return False

def cleanup_readme(configs, options):
    """Delete config description in README

    Arguments:
      configs: A list of CONFIGs to remove.
      options: option flags.
    """
    if not confirm(options, 'Clean up README?'):
        return

    patterns = []
    for config in configs:
        patterns.append(re.compile(r'^\s+%s' % config))

    with open('README') as f:
        lines = f.readlines()

    found = False
    newlines = []
    for line in lines:
        if not found:
            found = find_matching(patterns, line)
            if found:
                continue

        if found and re.search(r'^\s+CONFIG', line):
            found = False

        if not found:
            newlines.append(line)

    with open('README', 'w') as f:
        f.write(''.join(newlines))


### classes ###
class Progress:

    """Progress Indicator"""

    def __init__(self, total):
        """Create a new progress indicator.

        Arguments:
          total: A number of defconfig files to process.
        """
        self.current = 0
        self.total = total

    def inc(self):
        """Increment the number of processed defconfig files."""

        self.current += 1

    def show(self):
        """Display the progress."""
        print ' %d defconfigs out of %d\r' % (self.current, self.total),
        sys.stdout.flush()


class KconfigScanner:
    """Kconfig scanner."""

    def __init__(self):
        """Scan all the Kconfig files and create a Config object."""
        # Define environment variables referenced from Kconfig
        os.environ['srctree'] = os.getcwd()
        os.environ['UBOOTVERSION'] = 'dummy'
        os.environ['KCONFIG_OBJDIR'] = ''
        self.conf = kconfiglib.Config()


class KconfigParser:

    """A parser of .config and include/autoconf.mk."""

    re_arch = re.compile(r'CONFIG_SYS_ARCH="(.*)"')
    re_cpu = re.compile(r'CONFIG_SYS_CPU="(.*)"')

    def __init__(self, configs, options, build_dir):
        """Create a new parser.

        Arguments:
          configs: A list of CONFIGs to move.
          options: option flags.
          build_dir: Build directory.
        """
        self.configs = configs
        self.options = options
        self.dotconfig = os.path.join(build_dir, '.config')
        self.autoconf = os.path.join(build_dir, 'include', 'autoconf.mk')
        self.spl_autoconf = os.path.join(build_dir, 'spl', 'include',
                                         'autoconf.mk')
        self.config_autoconf = os.path.join(build_dir, AUTO_CONF_PATH)
        self.defconfig = os.path.join(build_dir, 'defconfig')

    def get_arch(self):
        """Parse .config file and return the architecture.

        Returns:
          Architecture name (e.g. 'arm').
        """
        arch = ''
        cpu = ''
        for line in open(self.dotconfig):
            m = self.re_arch.match(line)
            if m:
                arch = m.group(1)
                continue
            m = self.re_cpu.match(line)
            if m:
                cpu = m.group(1)

        if not arch:
            return None

        # fix-up for aarch64
        if arch == 'arm' and cpu == 'armv8':
            arch = 'aarch64'

        return arch

    def parse_one_config(self, config, dotconfig_lines, autoconf_lines):
        """Parse .config, defconfig, include/autoconf.mk for one config.

        This function looks for the config options in the lines from
        defconfig, .config, and include/autoconf.mk in order to decide
        which action should be taken for this defconfig.

        Arguments:
          config: CONFIG name to parse.
          dotconfig_lines: lines from the .config file.
          autoconf_lines: lines from the include/autoconf.mk file.

        Returns:
          A tupple of the action for this defconfig and the line
          matched for the config.
        """
        not_set = '# %s is not set' % config

        for line in autoconf_lines:
            line = line.rstrip()
            if line.startswith(config + '='):
                new_val = line
                break
        else:
            new_val = not_set

        for line in dotconfig_lines:
            line = line.rstrip()
            if line.startswith(config + '=') or line == not_set:
                old_val = line
                break
        else:
            if new_val == not_set:
                return (ACTION_NO_ENTRY, config)
            else:
                return (ACTION_NO_ENTRY_WARN, config)

        # If this CONFIG is neither bool nor trisate
        if old_val[-2:] != '=y' and old_val[-2:] != '=m' and old_val != not_set:
            # tools/scripts/define2mk.sed changes '1' to 'y'.
            # This is a problem if the CONFIG is int type.
            # Check the type in Kconfig and handle it correctly.
            if new_val[-2:] == '=y':
                new_val = new_val[:-1] + '1'

        return (ACTION_NO_CHANGE if old_val == new_val else ACTION_MOVE,
                new_val)

    def update_dotconfig(self):
        """Parse files for the config options and update the .config.

        This function parses the generated .config and include/autoconf.mk
        searching the target options.
        Move the config option(s) to the .config as needed.

        Arguments:
          defconfig: defconfig name.

        Returns:
          Return a tuple of (updated flag, log string).
          The "updated flag" is True if the .config was updated, False
          otherwise.  The "log string" shows what happend to the .config.
        """

        results = []
        updated = False
        suspicious = False
        rm_files = [self.config_autoconf, self.autoconf]

        if self.options.spl:
            if os.path.exists(self.spl_autoconf):
                autoconf_path = self.spl_autoconf
                rm_files.append(self.spl_autoconf)
            else:
                for f in rm_files:
                    os.remove(f)
                return (updated, suspicious,
                        color_text(self.options.color, COLOR_BROWN,
                                   "SPL is not enabled.  Skipped.") + '\n')
        else:
            autoconf_path = self.autoconf

        with open(self.dotconfig) as f:
            dotconfig_lines = f.readlines()

        with open(autoconf_path) as f:
            autoconf_lines = f.readlines()

        for config in self.configs:
            result = self.parse_one_config(config, dotconfig_lines,
                                           autoconf_lines)
            results.append(result)

        log = ''

        for (action, value) in results:
            if action == ACTION_MOVE:
                actlog = "Move '%s'" % value
                log_color = COLOR_LIGHT_GREEN
            elif action == ACTION_NO_ENTRY:
                actlog = "%s is not defined in Kconfig.  Do nothing." % value
                log_color = COLOR_LIGHT_BLUE
            elif action == ACTION_NO_ENTRY_WARN:
                actlog = "%s is not defined in Kconfig (suspicious).  Do nothing." % value
                log_color = COLOR_YELLOW
                suspicious = True
            elif action == ACTION_NO_CHANGE:
                actlog = "'%s' is the same as the define in Kconfig.  Do nothing." \
                         % value
                log_color = COLOR_LIGHT_PURPLE
            elif action == ACTION_SPL_NOT_EXIST:
                actlog = "SPL is not enabled for this defconfig.  Skip."
                log_color = COLOR_PURPLE
            else:
                sys.exit("Internal Error. This should not happen.")

            log += color_text(self.options.color, log_color, actlog) + '\n'

        with open(self.dotconfig, 'a') as f:
            for (action, value) in results:
                if action == ACTION_MOVE:
                    f.write(value + '\n')
                    updated = True

        self.results = results
        for f in rm_files:
            os.remove(f)

        return (updated, suspicious, log)

    def check_defconfig(self):
        """Check the defconfig after savedefconfig

        Returns:
          Return additional log if moved CONFIGs were removed again by
          'make savedefconfig'.
        """

        log = ''

        with open(self.defconfig) as f:
            defconfig_lines = f.readlines()

        for (action, value) in self.results:
            if action != ACTION_MOVE:
                continue
            if not value + '\n' in defconfig_lines:
                log += color_text(self.options.color, COLOR_YELLOW,
                                  "'%s' was removed by savedefconfig.\n" %
                                  value)

        return log


class DatabaseThread(threading.Thread):