tools: add genboardscfg.py

Now the primary data for each board is in Kconfig, defconfig and
MAINTAINERS.

It is true boards.cfg is needed for MAKEALL and buildman and might be
useful to brouse all the supported boards in a single database.
But it would be painful to maintain the boards.cfg in sync.

So, this is the solution.
Add a tool to generate the equivalent boards.cfg file based on
the latest Kconfig, defconfig and MAINTAINERS.

We can keep all the functions of MAKEALL and buildman with it.

The best thing would be to change MAKEALL and buildman for not
depending on boards.cfg in the future, but it would take some time.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>

tools/genboardscfg.py

@@ -0,0 +1,504 @@
+#!/usr/bin/env python
+#
+# Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+"""
+Converter from Kconfig and MAINTAINERS to boards.cfg
+
+Run 'tools/genboardscfg.py' to create boards.cfg file.
+
+Run 'tools/genboardscfg.py -h' for available options.
+"""
+
+import errno
+import fnmatch
+import glob
+import optparse
+import os
+import re
+import shutil
+import subprocess
+import sys
+import tempfile
+import time
+
+BOARD_FILE = 'boards.cfg'
+CONFIG_DIR = 'configs'
+REFORMAT_CMD = [os.path.join('tools', 'reformat.py'),
+                '-i', '-d', '-', '-s', '8']
+SHOW_GNU_MAKE = 'scripts/show-gnu-make'
+SLEEP_TIME=0.03
+
+COMMENT_BLOCK = '''#
+# List of boards
+#   Automatically generated by %s: don't edit
+#
+# Status, Arch, CPU(:SPLCPU), SoC, Vendor, Board, Target, Options, Maintainers
+
+''' % __file__
+
+### helper functions ###
+def get_terminal_columns():
+    """Get the width of the terminal.
+
+    Returns:
+      The width of the terminal, or zero if the stdout is not
+      associated with tty.
+    """
+    try:
+        return shutil.get_terminal_size().columns # Python 3.3~
+    except AttributeError:
+        import fcntl
+        import termios
+        import struct
+        arg = struct.pack('hhhh', 0, 0, 0, 0)
+        try:
+            ret = fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ, arg)
+        except IOError as exception:
+            if exception.errno != errno.ENOTTY:
+                raise
+            # If 'Inappropriate ioctl for device' error occurs,
+            # stdout is probably redirected. Return 0.
+            return 0
+        return struct.unpack('hhhh', ret)[1]
+
+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):
+            print >> sys.stderr, 'Please run at the top of source directory.'
+            sys.exit(1)
+
+def get_make_cmd():
+    """Get the command name of GNU Make."""
+    process = subprocess.Popen([SHOW_GNU_MAKE], stdout=subprocess.PIPE)
+    ret = process.communicate()
+    if process.returncode:
+        print >> sys.stderr, 'GNU Make not found'
+        sys.exit(1)
+    return ret[0].rstrip()
+
+### classes ###
+class MaintainersDatabase:
+
+    """The database of board status and maintainers."""
+
+    def __init__(self):
+        """Create an empty database."""
+        self.database = {}
+
+    def get_status(self, target):
+        """Return the status of the given board.
+
+        Returns:
+          Either 'Active' or 'Orphan'
+        """
+        tmp = self.database[target][0]
+        if tmp.startswith('Maintained'):
+            return 'Active'
+        elif tmp.startswith('Orphan'):
+            return 'Orphan'
+        else:
+            print >> sys.stderr, 'Error: %s: unknown status' % tmp
+
+    def get_maintainers(self, target):
+        """Return the maintainers of the given board.
+
+        If the board has two or more maintainers, they are separated
+        with colons.
+        """
+        return ':'.join(self.database[target][1])
+
+    def parse_file(self, file):
+        """Parse the given MAINTAINERS file.
+
+        This method parses MAINTAINERS and add board status and
+        maintainers information to the database.
+
+        Arguments:
+          file: MAINTAINERS file to be parsed
+        """
+        targets = []
+        maintainers = []
+        status = '-'
+        for line in open(file):
+            tag, rest = line[:2], line[2:].strip()
+            if tag == 'M:':
+                maintainers.append(rest)
+            elif tag == 'F:':
+                # expand wildcard and filter by 'configs/*_defconfig'
+                for f in glob.glob(rest):
+                    front, match, rear = f.partition('configs/')
+                    if not front and match:
+                        front, match, rear = rear.rpartition('_defconfig')
+                        if match and not rear:
+                            targets.append(front)
+            elif tag == 'S:':
+                status = rest
+            elif line == '\n' and targets:
+                for target in targets:
+                    self.database[target] = (status, maintainers)
+                targets = []
+                maintainers = []
+                status = '-'
+        if targets:
+            for target in targets:
+                self.database[target] = (status, maintainers)
+
+class DotConfigParser:
+
+    """A parser of .config file.
+
+    Each line of the output should have the form of:
+    Status, Arch, CPU, SoC, Vendor, Board, Target, Options, Maintainers
+    Most of them are extracted from .config file.
+    MAINTAINERS files are also consulted for Status and Maintainers fields.
+    """
+
+    re_arch = re.compile(r'CONFIG_SYS_ARCH="(.*)"')
+    re_cpu = re.compile(r'CONFIG_SYS_CPU="(.*)"')
+    re_soc = re.compile(r'CONFIG_SYS_SOC="(.*)"')
+    re_vendor = re.compile(r'CONFIG_SYS_VENDOR="(.*)"')
+    re_board = re.compile(r'CONFIG_SYS_BOARD="(.*)"')
+    re_config = re.compile(r'CONFIG_SYS_CONFIG_NAME="(.*)"')
+    re_options = re.compile(r'CONFIG_SYS_EXTRA_OPTIONS="(.*)"')
+    re_list = (('arch', re_arch), ('cpu', re_cpu), ('soc', re_soc),
+               ('vendor', re_vendor), ('board', re_board),
+               ('config', re_config), ('options', re_options))
+    must_fields = ('arch', 'config')
+
+    def __init__(self, build_dir, output, maintainers_database):
+        """Create a new .config perser.
+
+        Arguments:
+          build_dir: Build directory where .config is located
+          output: File object which the result is written to
+          maintainers_database: An instance of class MaintainersDatabase
+        """
+        self.dotconfig = os.path.join(build_dir, '.config')
+        self.output = output
+        self.database = maintainers_database
+
+    def parse(self, defconfig):
+        """Parse .config file and output one-line database for the given board.
+
+        Arguments:
+          defconfig: Board (defconfig) name
+        """
+        fields = {}
+        for line in open(self.dotconfig):
+            if not line.startswith('CONFIG_SYS_'):
+                continue
+            for (key, pattern) in self.re_list:
+                m = pattern.match(line)
+                if m and m.group(1):
+                    fields[key] = m.group(1)
+                    break
+
+        # sanity check of '.config' file
+        for field in self.must_fields:
+            if not field in fields:
+                print >> sys.stderr, 'Error: %s is not defined in %s' % \
+                                                            (field, defconfig)
+                sys.exit(1)
+
+        # fix-up for aarch64 and tegra
+        if fields['arch'] == 'arm' and 'cpu' in fields:
+            if fields['cpu'] == 'armv8':
+                fields['arch'] = 'aarch64'
+            if 'soc' in fields and re.match('tegra[0-9]*$', fields['soc']):
+                fields['cpu'] += ':arm720t'
+
+        target, match, rear = defconfig.partition('_defconfig')
+        assert match and not rear, \
+                                '%s : invalid defconfig file name' % defconfig
+
+        fields['status'] = self.database.get_status(target)
+        fields['maintainers'] = self.database.get_maintainers(target)
+
+        if 'options' in fields:
+            options = fields['config'] + ':' + \
+                      fields['options'].replace(r'\"', '"')
+        elif fields['config'] != target:
+            options = fields['config']
+        else:
+            options = '-'
+
+        self.output.write((' '.join(['%s'] * 9) + '\n')  %
+                          (fields['status'],
+                           fields['arch'],
+                           fields.get('cpu', '-'),
+                           fields.get('soc', '-'),
+                           fields.get('vendor', '-'),
+                           fields.get('board', '-'),
+                           target,
+                           options,
+                           fields['maintainers']))
+
+class Slot:
+
+    """A slot to store a subprocess.
+
+    Each instance of this class handles one subprocess.
+    This class is useful to control multiple processes
+    for faster processing.
+    """
+
+    def __init__(self, output, maintainers_database, devnull, make_cmd):
+        """Create a new slot.
+
+        Arguments:
+          output: File object which the result is written to
+          maintainers_database: An instance of class MaintainersDatabase
+        """
+        self.occupied = False
+        self.build_dir = tempfile.mkdtemp()
+        self.devnull = devnull
+        self.make_cmd = make_cmd
+        self.parser = DotConfigParser(self.build_dir, output,
+                                      maintainers_database)
+
+    def __del__(self):
+        """Delete the working directory"""
+        shutil.rmtree(self.build_dir)
+
+    def add(self, defconfig):
+        """Add a new subprocess to the slot.
+
+        Fails if the slot is occupied, that is, the current subprocess
+        is still running.
+
+        Arguments:
+          defconfig: Board (defconfig) name
+
+        Returns:
+          Return True on success or False on fail
+        """
+        if self.occupied:
+            return False
+        o = 'O=' + self.build_dir
+        self.ps = subprocess.Popen([self.make_cmd, o, defconfig],
+                                   stdout=self.devnull)
+        self.defconfig = defconfig
+        self.occupied = True
+        return True
+
+    def poll(self):
+        """Check if the subprocess is running and invoke the .config
+        parser if the subprocess is terminated.
+
+        Returns:
+          Return True if the subprocess is terminated, False otherwise
+        """
+        if not self.occupied:
+            return True
+        if self.ps.poll() == None:
+            return False
+        self.parser.parse(self.defconfig)
+        self.occupied = False
+        return True
+
+class Slots:
+
+    """Controller of the array of subprocess slots."""
+
+    def __init__(self, jobs, output, maintainers_database):
+        """Create a new slots controller.
+
+        Arguments:
+          jobs: A number of slots to instantiate
+          output: File object which the result is written to
+          maintainers_database: An instance of class MaintainersDatabase
+        """
+        self.slots = []
+        devnull = get_devnull()
+        make_cmd = get_make_cmd()
+        for i in range(jobs):
+            self.slots.append(Slot(output, maintainers_database,
+                                   devnull, make_cmd))
+
+    def add(self, defconfig):
+        """Add a new subprocess if a vacant slot is available.
+
+        Arguments:
+          defconfig: Board (defconfig) name
+
+        Returns:
+          Return True on success or False on fail
+        """
+        for slot in self.slots:
+            if slot.add(defconfig):
+                return True
+        return False
+
+    def available(self):
+        """Check if there is a vacant slot.
+
+        Returns:
+          Return True if a vacant slot is found, False if all slots are full
+        """
+        for slot in self.slots:
+            if slot.poll():
+                return True
+        return False
+
+    def empty(self):
+        """Check if all slots are vacant.
+
+        Returns:
+          Return True if all slots are vacant, False if at least one slot
+          is running
+        """
+        ret = True
+        for slot in self.slots:
+            if not slot.poll():
+                ret = False
+        return ret
+
+class Indicator:
+
+    """A class to control the progress indicator."""
+
+    MIN_WIDTH = 15
+    MAX_WIDTH = 70
+
+    def __init__(self, total):
+        """Create an instance.
+
+        Arguments:
+          total: A number of boards
+        """
+        self.total = total
+        self.cur = 0
+        width = get_terminal_columns()
+        width = min(width, self.MAX_WIDTH)
+        width -= self.MIN_WIDTH
+        if width > 0:
+            self.enabled = True
+        else:
+            self.enabled = False
+        self.width = width
+
+    def inc(self):
+        """Increment the counter and show the progress bar."""
+        if not self.enabled:
+            return
+        self.cur += 1
+        arrow_len = self.width * self.cur // self.total
+        msg = '%4d/%d [' % (self.cur, self.total)
+        msg += '=' * arrow_len + '>' + ' ' * (self.width - arrow_len) + ']'
+        sys.stdout.write('\r' + msg)
+        sys.stdout.flush()
+
+def __gen_boards_cfg(jobs):
+    """Generate boards.cfg file.
+
+    Arguments:
+      jobs: The number of jobs to run simultaneously
+
+    Note:
+      The incomplete boards.cfg is left over when an error (including 
+      the termination by the keyboard interrupt) occurs on the halfway.
+    """
+    check_top_directory()
+    print 'Generating %s ...  (jobs: %d)' % (BOARD_FILE, jobs)
+
+    # All the defconfig files to be processed
+    defconfigs = []
+    for (dirpath, dirnames, filenames) in os.walk(CONFIG_DIR):
+        dirpath = dirpath[len(CONFIG_DIR) + 1:]
+        for filename in fnmatch.filter(filenames, '*_defconfig'):
+            defconfigs.append(os.path.join(dirpath, filename))
+
+    # Parse all the MAINTAINERS files
+    maintainers_database = MaintainersDatabase()
+    for (dirpath, dirnames, filenames) in os.walk('.'):
+        if 'MAINTAINERS' in filenames:
+            maintainers_database.parse_file(os.path.join(dirpath,
+                                                         'MAINTAINERS'))
+
+    # Output lines should be piped into the reformat tool
+    reformat_process = subprocess.Popen(REFORMAT_CMD, stdin=subprocess.PIPE,
+                                        stdout=open(BOARD_FILE, 'w'))
+    pipe = reformat_process.stdin
+    pipe.write(COMMENT_BLOCK)
+
+    indicator = Indicator(len(defconfigs))
+    slots = Slots(jobs, pipe, maintainers_database)
+
+    # Main loop to process defconfig files:
+    #  Add a new subprocess into a vacant slot.
+    #  Sleep if there is no available slot.
+    for defconfig in defconfigs:
+        while not slots.add(defconfig):
+            while not slots.available():
+                # No available slot: sleep for a while
+                time.sleep(SLEEP_TIME)
+        indicator.inc()
+
+    # wait until all the subprocesses finish
+    while not slots.empty():
+        time.sleep(SLEEP_TIME)
+    print ''
+
+    # wait until the reformat tool finishes
+    reformat_process.communicate()
+    if reformat_process.returncode != 0:
+        print >> sys.stderr, '"%s" failed' % REFORMAT_CMD[0]
+        sys.exit(1)
+
+def gen_boards_cfg(jobs):
+    """Generate boards.cfg file.
+
+    The incomplete boards.cfg is deleted if an error (including
+    the termination by the keyboard interrupt) occurs on the halfway.
+
+    Arguments:
+      jobs: The number of jobs to run simultaneously
+    """
+    try:
+        __gen_boards_cfg(jobs)
+    except:
+        # We should remove incomplete boards.cfg
+        try:
+            os.remove(BOARD_FILE)
+        except OSError as exception:
+            # Ignore 'No such file or directory' error
+            if exception.errno != errno.ENOENT:
+                raise
+        raise
+
+def main():
+    parser = optparse.OptionParser()
+    # Add options here
+    parser.add_option('-j', '--jobs',
+                      help='the number of jobs to run simultaneously')
+    (options, args) = parser.parse_args()
+    if options.jobs:
+        try:
+            jobs = int(options.jobs)
+        except ValueError:
+            print >> sys.stderr, 'Option -j (--jobs) takes a number'
+            sys.exit(1)
+    else:
+        try:
+            jobs = int(subprocess.Popen(['getconf', '_NPROCESSORS_ONLN'],
+                                     stdout=subprocess.PIPE).communicate()[0])
+        except (OSError, ValueError):
+            print 'info: failed to get the number of CPUs. Set jobs to 1'
+            jobs = 1
+    gen_boards_cfg(jobs)
+
+if __name__ == '__main__':
+    main()