acprep

#!/usr/bin/env python

# acprep, version 3.0
#
# This script configures my ledger source tree on my Mac OS/X machine.  This
# is not necessary, however, since I keep all the files necessary for building
# checked in to the source tree.  Users can just type './configure && make'.
# This script simply sets up the compiler and linker flags for all the various
# build permutations I use for testing and profiling.

import inspect
import logging
import logging.handlers
import optparse
import os
import re
import shutil
import string
import sys
import time
import tempfile
import datetime

try:
    import hashlib
except:
    import md5

from os.path import *
from stat import *
from subprocess import Popen, PIPE, call

LEVELS = {'DEBUG':    logging.DEBUG,
          'INFO':     logging.INFO,
          'WARNING':  logging.WARNING,
          'ERROR':    logging.ERROR,
          'CRITICAL': logging.CRITICAL}

def which(program):
    def is_exe(fpath):
        return os.path.exists(fpath) and os.access(fpath, os.X_OK)

    def ext_candidates(fpath):
        yield fpath
        for ext in os.environ.get("PATHEXT", "").split(os.pathsep):
            yield fpath + ext

    fpath, fname = os.path.split(program)
    if fpath:
        if is_exe(program):
            return program
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            exe_file = os.path.join(path, program)
            for candidate in ext_candidates(exe_file):
                if is_exe(candidate):
                    return candidate

    return None

class BoostInfo(object):
    def dependencies(self, system):
        if system == 'darwin-homebrew':
            return [ 'boost' ]

        if system == 'darwin-macports':
            return [ 'boost-jam', 'boost', '+python27+universal' ]

        if system == 'centos':
            return [ 'boost-devel' ]

        elif system == 'ubuntu-trusty':
            return [ 'libboost-dev',
                     'libboost-date-time-dev',
                     'libboost-filesystem-dev',
                     'libboost-iostreams-dev',
                     'libboost-python-dev',
                     'libboost-regex-dev',
                     'libboost-system-dev',
                     'libboost-test-dev' ]

        elif system == 'ubuntu-saucy' or system == 'ubuntu-precise':
            return [ 'autopoint',
                     'libboost-dev',
                     'libboost-test-dev',
                     'libboost-regex-dev',
                     'libboost-date-time-dev',
                     'libboost-filesystem-dev',
                     'libboost-iostreams-dev',
                     'libboost-python-dev' ]

        elif system == 'ubuntu-lucid':
            return [ 'bjam', 'autopoint',
                     'libboost-dev',
                     'libboost-regex-dev',
                     'libboost-date-time-dev',
                     'libboost-filesystem-dev',
                     'libboost-iostreams-dev',
                     'libboost-python-dev' ]


class CommandLineApp(object):
    "Base class for building command line applications."

    force_exit    = True           # If true, always ends run() with sys.exit()
    log_handler   = None
    boost_major   = "1_52"

    def __init__(self):
        "Initialize CommandLineApp."
        # Create the logger
        self.log = logging.getLogger(os.path.basename(sys.argv[0]))
        ch = logging.StreamHandler()
        formatter = logging.Formatter("%(name)s: %(levelname)s: %(message)s")
        ch.setFormatter(formatter)
        self.log.addHandler(ch)
        self.log_handler = ch

        # Setup the options parser
        usage = 'usage: %prog [OPTIONS...] [ARGS...]'
        op = self.option_parser = optparse.OptionParser(usage = usage,
                                                        conflict_handler = 'resolve')
        op.add_option('', '--debug',
                      action='store_true', dest='debug',
                      default=False, help='show debug messages and pass exceptions')
        op.add_option('-v', '--verbose',
                      action='store_true', dest='verbose',
                      default=False, help='show informational messages')
        op.add_option('-q', '--quiet',
                      action='store_true', dest='quiet',
                      default=False, help='do not show log messages on console')
        op.add_option('', '--log', metavar='FILE',
                      type='string', action='store', dest='logfile',
                      default=False, help='append logging data to FILE')
        op.add_option('', '--loglevel', metavar='LEVEL',
                      type='string', action='store', dest='loglevel',
                      default=False, help='set log level: DEBUG, INFO, WARNING, ERROR, CRITICAL')

        self.options = op.get_default_values()

    def main(self, *args):
        """Main body of your application.

        This is the main portion of the app, and is run after all of the
        arguments are processed.  Override this method to implment the primary
        processing section of your application."""
        pass

    def handleInterrupt(self):
        """Called when the program is interrupted via Control-C or SIGINT.
        Returns exit code."""
        self.log.error('Canceled by user.')
        return 1

    def handleMainException(self):
        "Invoked when there is an error in the main() method."
        if not self.options.debug:
            self.log.exception('Caught exception')
        return 1

    ## INTERNALS (Subclasses should not need to override these methods)

    def run(self):
        """Entry point.

        Process options and execute callback functions as needed.  This method
        should not need to be overridden, if the main() method is defined."""
        # Process the options supported and given
        self.options, main_args = self.option_parser.parse_args(values=self.options)

        if self.options.logfile:
            fh = logging.handlers.RotatingFileHandler(self.options.logfile,
                                                      maxBytes = (1024 * 1024),
                                                      backupCount = 5)
            formatter = logging.Formatter("%(asctime)s - %(levelname)s: %(message)s")
            fh.setFormatter(formatter)
            self.log.addHandler(fh)

        if self.options.quiet:
            self.log.removeHandler(self.log_handler)
            ch = logging.handlers.SysLogHandler()
            formatter = logging.Formatter("%(name)s: %(levelname)s: %(message)s")
            ch.setFormatter(formatter)
            self.log.addHandler(ch)
            self.log_handler = ch

        if self.options.loglevel:
            self.log.setLevel(LEVELS[self.options.loglevel])
        elif self.options.debug:
            self.log.setLevel(logging.DEBUG)
        elif self.options.verbose:
            self.log.setLevel(logging.INFO)

        exit_code = 0
        try:
            # We could just call main() and catch a TypeError, but that would
            # not let us differentiate between application errors and a case
            # where the user has not passed us enough arguments.  So, we check
            # the argument count ourself.
            argspec = inspect.getargspec(self.main)
            expected_arg_count = len(argspec[0]) - 1

            if len(main_args) >= expected_arg_count:
                exit_code = self.main(*main_args)
            else:
                self.log.debug('Incorrect argument count (expected %d, got %d)' %
                               (expected_arg_count, len(main_args)))
                self.option_parser.print_help()
                exit_code = 1

        except KeyboardInterrupt:
            exit_code = self.handleInterrupt()

        except SystemExit as msg:
            exit_code = msg.args[0]

        except Exception:
            exit_code = self.handleMainException()
            if self.options.debug:
                raise

        if self.force_exit:
            sys.exit(exit_code)
        return exit_code


class PrepareBuild(CommandLineApp):
    #########################################################################
    # Initialization routines                                               #
    #########################################################################

    def initialize(self):
        self.log.debug('Initializing all state variables')

        self.should_clean    = False
        self.configured      = False
        self.current_ver     = None
        #self.current_flavor  = 'default'
        self.current_flavor  = 'debug'
        self.products_dir    = None
        self.configure_args  = []
        self.CXXFLAGS        = []
        self.LDFLAGS         = []

        self.envvars = {
            'CXX':      'g++',
            'CXXFLAGS': '',
            'LDFLAGS':  '',
        }

        for varname in self.envvars.keys():
            if varname in os.environ:
                self.envvars[varname] = os.environ[varname]

                if varname.endswith('FLAGS'):
                    self.__dict__[varname] = str.split(os.environ[varname])
                    self.envvars[varname]  = ''

        # If ~/Products/ or build/ exists, use them instead of the source tree
        # for building
        products = self.default_products_directory()
        if (exists(products) and isdir(products)) or \
           (exists('build') and isdir('build')):
            self.options.build_dir = None

    def __init__(self):
        CommandLineApp.__init__(self)
        self.log.setLevel(logging.INFO)

        self.source_dir = os.getcwd()

        op = self.option_parser

        op.add_option('', '--help', action="callback",
                      callback=self.option_help,
                      help='Show this help text')
        op.add_option('-j', '--jobs', metavar='N',
                      type='int', action='store', dest='jobs',
                      default=1, help='Allow N make jobs at once')

        op.add_option('', '--boost', metavar='BOOST_ROOT',
                      action="store", dest="boost_root",
                      help='Set Boost library root (ex: "--boost=/usr/local")')
        op.add_option('', '--boost-suffix', metavar='BOOST_SUFFIX',
                      action="store", dest="boost_suffix",
                      help='Set Boost library suffix (ex: "--boost-suffix=-mt")')
        op.add_option('', '--boost-include', metavar='BOOST_INCLUDE',
                      action="store", dest="boost_include",
                      help='Set Boost include path (ex: "--boost-include=DIR")')

        op.add_option('', '--compiler', metavar='COMPILER',
                      action="store", dest="compiler",
                      help='Use the Clang C++ compiler')
        op.add_option('', '--cxx', metavar='COMPILER',
                      action="store", dest="compiler",
                      help='Use the Clang C++ compiler')

        op.add_option('-N', '--ninja', action='store_true', dest='use_ninja',
                      default=False,
                      help='Use ninja to build, rather than make')
        op.add_option('', '--no-git', action='store_true', dest='no_git',
                      default=False,
                      help='Do not call out to Git; useful for offline builds')
        op.add_option('', '--doxygen', action='store_true',
                      dest='enable_doxygen', default=False,
                      help='Enable use of Doxygen to build ref manual ("make docs")')
        op.add_option('', '--python', action='store_true', dest='python',
                      default=False,
                      help='Enable Python support')
        op.add_option('', '--no-python', action='store_false', dest='python',
                      help='Disable python support (default)')
        op.add_option('', '--prefix', metavar='DIR', action="store",
                      dest="prefix_dir", help='Use custom installation prefix')
        op.add_option('', '--products', metavar='DIR', action="store",
                      dest="option_products",
                      help='Collect all build products in this directory')
        op.add_option('', '--output', metavar='DIR', action="store",
                      default=self.source_dir,
                      dest="build_dir", help='Build in the specified directory')
        op.add_option('', '--local', action="callback",
                      callback=self.option_local,
                      help='Build directly within the source tree (default)')

        self.options = op.get_default_values()

        self.initialize()

    def main(self, *args):
        if args and args[0] in ['default', 'debug', 'opt', 'gcov', 'gprof']:
            self.current_flavor = args[0]
            args = args[1:]

        if args:
            cmd = args[0]
            if 'phase_' + cmd not in PrepareBuild.__dict__:
                self.log.error("Unknown build phase: " + cmd + "\n")
                sys.exit(1)
            else:
                args = args[1:]
        else:
            cmd = 'config'

        self.log.info('Invoking primary phase: ' + cmd)
        PrepareBuild.__dict__['phase_' + cmd](self, *args)

    #########################################################################
    # General utility code                                                  #
    #########################################################################

    def execute(self, *args):
        try:
            self.log.debug('Executing command: ' + ' '.join(args))

            retcode = call(args, shell=False)
            if retcode < 0:
                self.log.error("Child was terminated by signal", -retcode)
                sys.exit(1)
            elif retcode != 0:
                self.log.error("Execution failed: " + ' '.join(args))
                sys.exit(1)
        except OSError as e:
            self.log.error("Execution failed: " + e)
            sys.exit(1)

    def get_stdout(self, *args):
        try:
            self.log.debug('Executing command: ' + ' '.join(args))

            proc    = Popen(args, shell=False, stdout=PIPE)
            stdout  = proc.stdout.read()
            retcode = proc.wait()
            if retcode < 0:
                self.log.error("Child was terminated by signal",
                               -retcode)
                sys.exit(1)
            elif retcode != 0:
                self.log.error("Execution failed: " + ' '.join(args))
                sys.exit(1)
            return stdout[:-1]
        except OSError as e:
            self.log.error("Execution failed:" + e)
            sys.exit(1)

    def isnewer(self, file1, file2):
        "Check if file1 is newer than file2."
        if not exists(file2):
            return True
        return os.stat(file1)[ST_MTIME] > os.stat(file2)[ST_MTIME]

    #########################################################################
    # Determine information about the surroundings                          #
    #########################################################################

    def prefix_directory(self):
        if self.options.prefix_dir:
            return self.options.prefix_dir
        else:
            return None

    def default_products_directory(self):
        return join(os.environ['HOME'], "Products")

    def products_directory(self):
        if not self.products_dir:
            products = self.default_products_directory()

            if not exists(products) or not isdir(products):
                products = join(self.source_dir, 'build')

            products = join(products, basename(self.source_dir))

            self.products_dir = products

        return self.products_dir

    def build_directory(self):
        if not self.options.build_dir:
            self.options.build_dir = join(self.products_directory(),
                                          self.current_flavor)
        return self.options.build_dir

    def ensure(self, dirname):
        if not exists(dirname):
            self.log.info('Making directory: ' + dirname)
            os.makedirs(dirname)
        elif not isdir(dirname):
            self.log.error('Directory is not a directory: ' + dirname)
            sys.exit(1)
        return dirname

    def git_working_tree(self):
        return exists('.git') and isdir('.git') and not self.options.no_git

    def current_version(self):
        if not self.current_ver:
            major, minor, patch, date = None, None, None, None

            version_m4 = open('CMakeLists.txt', 'r')
            for line in version_m4.readlines():
                match = re.match('^set\(Ledger_VERSION_MAJOR ([0-9]+)\)', line)
                if match:
                    major = match.group(1)
                match = re.match('^set\(Ledger_VERSION_MINOR ([0-9]+)\)', line)
                if match:
                    minor = match.group(1)
                match = re.match('^set\(Ledger_VERSION_PATCH ([0-9]+)\)', line)
                if match:
                    patch = match.group(1)
                match = re.match('^set\(Ledger_VERSION_DATE ([0-9]+)\)', line)
                if match:
                    date = match.group(1)
                    break
            self.current_ver = "%s.%s.%s%s" % (major, minor, patch,
                                               "-%s" % date if date else "")
            version_m4.close()
        return self.current_ver

    def phase_products(self, *args):
        self.log.info('Executing phase: products')
        print(self.products_directory())

    def phase_info(self, *args):
        self.log.info('Executing phase: info')

        environ, conf_args = self.configure_environment()

        self.log.info("Current version          => " + self.current_version())
        self.log.info("Current flavor           => " + self.current_flavor)
        self.log.info("Source directory         => " + self.source_dir)
        if self.prefix_directory():
            self.log.info("Installation prefix      => " + self.prefix_directory())
        self.log.info("Products directory       => " + self.products_directory())
        self.log.info("Build directory          => " + self.build_directory())

        self.log.debug('CMake environment =>')

        keys = environ.keys()
        keys.sort()
        for key in keys:
            if key in ['PATH', 'CXX'] or key.endswith('FLAGS'):
                self.log.debug('  %s=%s' % (key, environ[key]))

        self.log.debug('CMake arguments   =>')

        for arg in conf_args + list(args):
            self.log.debug('  %s' % arg)

    def phase_sloc(self, *args):
        self.log.info('Executing phase: sloc')
        self.execute('sloccount', 'src', 'python', 'lisp', 'test')

    #########################################################################
    # Update local files with the latest information                        #
    #########################################################################

    def phase_submodule(self, *args):
        self.log.info('Executing phase: submodule')
        if self.git_working_tree():
            self.execute('git', 'submodule', 'init')
            self.execute('git', 'submodule', 'update')

    def phase_pull(self, *args):
        self.log.info('Executing phase: pull')
        if self.git_working_tree():
            self.execute('git', 'pull')
            self.phase_submodule()

    #########################################################################
    # Automatic installation of build dependencies                          #
    #########################################################################

    def phase_dependencies(self, *args):
        self.log.info('Executing phase: dependencies')

        self.log.info("Installing Ledger's build dependencies ...")

        system = self.get_stdout('uname', '-s')

        if system == 'Darwin':
            if exists('/opt/local/bin/port'):
                self.log.info('Looks like you are using MacPorts on OS X')
                packages = [
                    'sudo', 'port', 'install', '-f',
                    'automake', 'autoconf', 'libtool',
                    'python27', '+universal',
                    'libiconv', '+universal',
                    'zlib', '+universal',
                    'gmp' ,'+universal', 'mpfr', '+universal',
                    'ncurses', '+universal', 'ncursesw', '+universal',
                    'gettext' ,'+universal',
                    'libedit' ,'+universal',
                    'texlive-xetex', 'doxygen', 'graphviz', 'texinfo',
                    'lcov', 'sloccount'
                ] + BoostInfo().dependencies('darwin-macports')
                self.log.info('Executing: ' + ' '.join(packages))
                self.execute(*packages)
            elif exists('/usr/local/bin/brew') or exists('/opt/local/bin/brew'):
                self.log.info('Looks like you are using Homebrew on OS X')
                packages = [
                    'brew', 'install',
                    'cmake', 'ninja',
                    'mpfr', 'gmp',
                ] + BoostInfo().dependencies('darwin-homebrew')
                self.log.info('Executing: ' + ' '.join(packages))
                self.execute(*packages)
            elif exists('/sw/bin/fink'):
                self.log.info('Looks like you are using Fink on OS X')
                self.log.error("I don't know the package names for Fink yet!")
                sys.exit(1)

        elif system == 'Linux':
            if exists('/etc/issue'):
                issue = open('/etc/issue')
                if issue.readline().startswith('Ubuntu'):
                    release = open('/etc/lsb-release')
                    info = release.read()
                    release.close()
                    if re.search('trusty', info):
                        self.log.info('Looks like you are using APT on Ubuntu Trusty')
                        packages = [
                            'sudo', 'apt-get', 'install',
                            'build-essential',
                            'doxygen',
                            'cmake',
                            'ninja-build',
                            'zlib1g-dev',
                            'libbz2-dev',
                            'python-dev',
                            'libgmp3-dev',
                            'libmpfr-dev',
                            'gettext',
                            'libedit-dev',
                            'texinfo',
                            'lcov',
                            'sloccount'
                        ] + BoostInfo().dependencies('ubuntu-trusty')
                    elif re.search('saucy', info):
                        self.log.info('Looks like you are using APT on Ubuntu Saucy')
                        packages = [
                            'sudo', 'apt-get', 'install',
                            'build-essential',
                            'libtool',
                            'cmake',
                            'ninja-build',
                            'zlib1g-dev',
                            'libbz2-dev',
                            'python-dev',
                            'libgmp-dev',
                            'libmpfr-dev',
                            'gettext',
                            'libedit-dev',
                            'texinfo',
                            'lcov',
                            'sloccount'
                        ] + BoostInfo().dependencies('ubuntu-saucy')
                    elif re.search('precise', info):
                        self.log.info('Looks like you are using APT on Ubuntu Precise')
                        packages = [
                            'sudo', 'apt-get', 'install',
                            'build-essential',
                            'libtool',
                            'cmake',
                            'zlib1g-dev',
                            'libbz2-dev',
                            'python-dev',
                            'libgmp-dev',
                            'libmpfr-dev',
                            'gettext',
                            'libedit-dev',
                            'texinfo',
                            'lcov',
                            'sloccount'
                        ] + BoostInfo().dependencies('ubuntu-precise')
                    else:
                        self.log.info('I do not recognize your version of Ubuntu!')
                        packages = None
                    if packages:
                        self.log.info('Executing: ' + ' '.join(packages))
                        self.execute(*packages)

            if exists('/etc/redhat-release'):
                release = open('/etc/redhat-release')
                if release.readline().startswith('CentOS'):
                    self.log.info('Looks like you are using YUM on CentOS')
                    packages = [
                        'sudo', 'yum', 'install',
                        'gcc',
                        'gcc-c++',
                        'compat-gcc-*',
                        'make',
                        'libtool',
                        'autoconf',
                        'automake',
                        'zlib-devel',
                        'bzip2-devel',
                        'python-devel',
                        'gmp-devel',
                        'gettext-devel',
                        #'mpfr-devel'
                        'libedit-devel',
                        #'texlive-full',
                        #'doxygen',
                        #'graphviz',
                        'texinfo',
                        #'lcov',
                        #'sloccount'
                    ]
                    self.log.info('Executing: ' + ' '.join(packages))
                    self.execute(*packages)

    #########################################################################
    # Determine the system's basic configuration                            #
    #########################################################################

    def setup_for_johnw(self):
        self.configure_args.append('-DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=ON')

        if not self.options.compiler:
            self.configure_args.append('-DCMAKE_CXX_COMPILER:PATH=/usr/local/bin/clang++')

            if self.current_flavor == 'opt':
                self.configure_args.append('-DCMAKE_CXX_FLAGS_RELEASE:STRING=-O3')
                self.configure_args.append('-DCMAKE_EXE_LINKER_FLAGS:STRING=-O3')
                self.configure_args.append('-DCMAKE_SHARED_LINKER_FLAGS:STRING=-O3')
                self.configure_args.append('-DCMAKE_MODULE_LINKER_FLAGS:STRING=-O3')
            #else:
            #    self.CXXFLAGS.append('-g -O1 -faddress-sanitizer')
            #    self.LDFLAGS.append('-g -O1 -faddress-sanitizer')

            self.configure_args.append(self.source_dir)

        else:
            self.configure_args.append('-DCMAKE_CXX_COMPILER:PATH=' + self.options.compiler)
            self.configure_args.append('-DCMAKE_INCLUDE_PATH:STRING=/usr/local/include')
            self.configure_args.append('-DCMAKE_LIBRARY_PATH:STRING=/usr/local/lib')
            self.configure_args.append('-DBOOST_ROOT=/usr/local')
            self.configure_args.append(self.source_dir)

    def setup_for_system(self):
        system = str(self.get_stdout('uname', '-s'))
        self.log.info('System type is => ' + system)

        if self.options.enable_doxygen:
            self.configure_args.append('-DUSE_DOXYGEN=1')
        if self.options.python:
            self.configure_args.append('-DUSE_PYTHON=1')

        if self.options.use_ninja:
            self.configure_args.append('-GNinja')

        if exists('/Users/johnw/Projects/ledger/plan/TODO'):
            self.setup_for_johnw()

    def setup_flavor(self):
        self.setup_for_system()

        if 'setup_flavor_' + self.current_flavor not in PrepareBuild.__dict__:
            self.log.error('Unknown build flavor "%s"' % self.current_flavor)
            sys.exit(1)

        self.log.info('Setting up build flavor => ' + self.current_flavor)
        PrepareBuild.__dict__['setup_flavor_' + self.current_flavor](self)

    def escape_string(self, data):
        return re.sub('(["\\\\])', '\\\\\\1', data)

    def finalize_config(self):
        self.setup_flavor()

        for var in ('CXXFLAGS', 'LDFLAGS'):
            value = self.__dict__[var]
            if value:
                first = not self.envvars[var]
                for member in value:
                    #escaped = self.escape_string(member)
                    #if member != escaped:
                    #    member = escaped
                    if first:
                        first = False
                    else:
                        self.envvars[var] += ' '
                    self.envvars[var] += member
                self.log.debug('Final value of %s: %s' %
                               (var, self.envvars[var]))

            elif var in self.envvars:
                del self.envvars[var]

    #########################################################################
    # Options that can modify any build flavor                              #
    #########################################################################

    def option_local(self, option=None, opt_str=None, value=None, parser=None):
        self.log.debug('Saw option --local')
        self.options.build_dir = self.source_dir

    def option_help(self, option=None, opt_str=None, value=None, parser=None):
        self.phase_help()

    #########################################################################
    # The various build flavors                                             #
    #########################################################################

    def setup_flavor_default(self):
        pass

    def setup_flavor_debug(self):
        self.configure_args.append('-DBUILD_DEBUG=1')

    def setup_flavor_opt(self):
        self.configure_args.append('-DNO_ASSERTS=1')

    def setup_flavor_gcov(self):
        # NO_ASSERTS is set so that branch coverage ignores the never-taken
        # else branch inside assert statements.
        self.configure_args.append('-DBUILD_DEBUG=1')
        self.configure_args.append('-DNO_ASSERTS=1')
        self.configure_args.append('-DCLANG_GCOV=1')

        self.CXXFLAGS.append('-fprofile-arcs')
        self.CXXFLAGS.append('-ftest-coverage')
        self.LDFLAGS.append('-fprofile-arcs')
        self.LDFLAGS.append('-ftest-coverage')

        if not self.options.compiler or self.options.compiler == "clang-3.1":
            self.LDFLAGS.append('-lgcov')

    def setup_flavor_gprof(self):
        self.configure_args.append('-DBUILD_DEBUG=1')

        self.CXXFLAGS.append('-pg')
        self.LDFLAGS.append('-pg')

    #########################################################################
    # Configure build tree using CMake                                      #
    #########################################################################

    def configure_environment(self):
        self.finalize_config()

        environ = dict(os.environ)
        for key, value in self.envvars.items():
            if value:
                environ[key] = value

        if self.build_directory() == self.source_dir:
            conf_args = ['cmake']
        else:
            conf_args = ['cmake', self.source_dir]

        if not which('cmake'):
            self.log.error("Cannot find CMake, please check your PATH")
            sys.exit(1)

        for var in ('CXX', 'CXXFLAGS', 'LDFLAGS'):
            if self.envvars.get(var) and (var.endswith('FLAGS')
                                          or exists(self.envvars[var])):
                if var == 'CXX':
                    conf_args.append('-DCMAKE_CXX_COMPILER=%s' %
                                     self.envvars[var])
                elif var == 'CXXFLAGS':
                    conf_args.append('-DCMAKE_CXX_FLAGS=%s' %
                                     self.envvars[var])
                elif var == 'LDFLAGS':
                    conf_args.append('-DCMAKE_EXE_LINKER_FLAGS=%s' % 
                                     self.envvars[var])

        if self.options.boost_root:
            conf_args.append('-DBOOST_ROOT=%s' %
                             self.options.boost_root)
            conf_args.append('-DBoost_NO_SYSTEM_PATHS=TRUE')
        if self.options.boost_suffix:
            conf_args.append('-DBoost_COMPILER=%s' %
                             self.options.boost_suffix)
        if self.options.boost_include:
            conf_args.append('-DBOOST_INCLUDEDIR=%s' %
                             self.options.boost_include)
        if self.options.build_dir:
            conf_args.append('-DBUILD_DIR=%s' %
                             self.options.build_dir)

        if self.prefix_directory():
            conf_args.append('-DCMAKE_INSTALL_PREFIX=%s' % self.prefix_directory())

        return (environ, conf_args + self.configure_args)

    def phase_configure(self, *args):
        self.log.info('Executing phase: configure')

        self.configured = True

        environ, conf_args = self.configure_environment()
        for arg in args:
            if arg: conf_args.append(arg)

        build_dir = self.ensure(self.build_directory())
        try:
            os.chdir(build_dir)

            need_to_config = not isfile('rules.ninja' if self.options.use_ninja else 'Makefile')
            if need_to_config:
                self.log.debug('Source => ' + self.source_dir)
                self.log.debug('Build  => ' + build_dir)
                self.log.debug('configure env  => ' + str(environ))
                self.log.debug('configure args => ' + str(conf_args))

                configure = Popen(conf_args, shell=False, env=environ)
                retcode = configure.wait()
                if retcode < 0:
                    self.log.error("Child was terminated by signal", -retcode)
                    sys.exit(1)
                elif retcode != 0:
                    self.log.error("Execution failed: " + ' '.join(conf_args))
                    sys.exit(1)
            else:
                self.log.debug('configure does not need to be run')

        finally:
            os.chdir(self.source_dir)

    def phase_config(self, *args):
        self.log.info('Executing phase: config')
        self.phase_submodule()
        self.phase_configure(*args)
        if self.should_clean:
            self.phase_clean()

    #########################################################################
    # Builds products from the sources                                      #
    #########################################################################

    def phase_make(self, *args):
        self.log.info('Executing phase: make')

        config_args = []
        make_args   = []

        for arg in args:
            if arg.startswith('--') or arg.startswith('-D'):
                config_args.append(arg)
            else:
                make_args.append(arg)

        if self.options.jobs > 1 and self.current_flavor != 'gcov':
            make_args.append('-j%d' % self.options.jobs)

        if self.options.verbose:
            make_args.append('-v' if self.options.use_ninja else 'VERBOSE=1')

        self.log.debug('Configure arguments => ' + str(config_args))
        self.log.debug('Makefile arguments  => ' + str(make_args))

        if not self.configured:
            self.phase_config(*config_args)

        build_dir = self.ensure(self.build_directory())
        try:
            self.log.debug('Changing directory to ' + build_dir)
            os.chdir(build_dir)

            self.execute(*(['ninja' if self.options.use_ninja else 'make'] + 
                           make_args))
        finally:
            os.chdir(self.source_dir)

    def phase_check(self, *args):
        self.log.info('Executing phase: check')
        build_dir = self.ensure(self.build_directory())
        try:
            self.log.debug('Changing directory to ' + build_dir)
            os.chdir(build_dir)

            make_args = list(args)
            if self.options.jobs > 1:
                make_args.append('-j%d' % self.options.jobs)

            self.execute(*(['ctest'] + list(make_args)))
        finally:
            os.chdir(self.source_dir)

    def phase_update(self, *args):
        self.log.info('Executing phase: update')
        self.phase_pull()
        self.phase_make(*args)

    #########################################################################
    # Build directory cleaning phases                                       #
    #########################################################################

    def phase_clean(self, *args):
        self.log.info('Executing phase: clean')
        self.phase_make('clean')

    def phase_gitclean(self, *args):
        self.log.info('Executing phase: gitclean')
        if self.git_working_tree():
            self.execute('git', 'clean', '-dfx')

    #########################################################################
    # Other build phases                                                    #
    #########################################################################

    def configure_flavor(self, flavor, reset=True):
        self.initialize()                  # reset everything
        self.current_flavor = flavor
        self.options.build_dir      = None # use the build/ tree
        self.options.prefix_dir     = None

        if reset and exists(self.build_directory()) and \
           isdir(self.build_directory()):
            self.log.info('=== Wiping build directory %s ===' %
                          self.build_directory())
            try:
                shutil.rmtree(self.build_directory())
            except:
                self.execute('chmod', '-R', 'u+w', self.build_directory())
                self.execute('rm', '-fr', self.build_directory())

    def phase_rsync(self, *args):
        self.log.info('Executing phase: rsync')

        proof_dir = 'ledger-proof'

        if self.options.python:
            proof_dir += "-python"
        if self.options.compiler:
            proof_dir += "-" + basename(self.options.compiler)

        source_copy_dir = join(self.ensure(self.products_directory()), proof_dir)

        self.execute('rsync', '-a', '--delete', '--exclude=/dist/',
                     '--exclude=.git/', '--exclude=b/',
                     '--exclude=/lib/boost-release/',
                     '--exclude=/archive/', '--exclude=/build/',
                     '%s/' % self.source_dir, '%s/' % source_copy_dir)

        self.source_dir = source_copy_dir

    def phase_proof(self, *args):
        self.log.info('Executing phase: proof')

        self.log.info('=== Copying source tree ===')
        self.phase_rsync()

        self.phase_makeall(reset=True, *args)

        self.configure_flavor('opt', reset=False)
        self.log.info('=== Testing opt ===')
        # jww (2012-05-20): Can't use fullcheck yet
        #self.phase_make('fullcheck')
        self.phase_make('test')

        self.configure_flavor('gcov', reset=False)
        self.log.info('=== Testing gcov ===')
        #self.phase_make('check')
        self.phase_make('test')

        self.configure_flavor('default', reset=False)
        self.log.info('=== Testing default ===')
        #self.phase_make('fullcheck')
        self.phase_make('test')
        # jww (2012-05-20): docs are not working yet
        #self.phase_make('docs')

        self.configure_flavor('debug', reset=False)
        self.log.info('=== Testing debug ===')
        #self.phase_make('fullcheck')
        self.phase_make('test')

    def phase_makeall(self, reset=False, *args):
        self.log.info('Executing phase: makeall')

        self.configure_flavor('opt', reset)
        self.log.info('=== Building opt ===')
        self.phase_make(*args)

        self.configure_flavor('gcov', reset)
        self.log.info('=== Building gcov ===')
        self.phase_make(*args)

        self.configure_flavor('default', reset)
        self.log.info('=== Building default ===')
        self.phase_make(*args)

        self.configure_flavor('debug', reset)
        self.log.info('=== Building debug ===')
        self.phase_make(*args)

    #########################################################################
    # Help                                                                  #
    #########################################################################

    def phase_help(self, *args):
        self.option_parser.print_help()

        print("""
Of the optional ARGS, the first is an optional build FLAVOR, with the default
being 'debug':

  default           Regular autoconf settings
  debug             Debugging and --verify support (default)
  opt               Full optimizations
  gcov              Coverage analysis
  gprof             Code profiling (for OS X, just use: 'shark -i ledger ...')

Next is the optional build PHASE, with 'config' being the default:

  clean             Runs 'make clean' in the build directory
  config            Configure the environment for building
  dependencies      Automatically install all necessary build dependencies
  gitclean          Runs 'git clean -dfx', which *really* cleans things
  help              Displays this help text
  info              Show information about the build environment
  make              Do a make in the build directory
  proof             Proves Ledger by building and testing every flavor
  pull              Pulls the latest, and updates local config if need be
  update            Does it all, updates your environment and re-make's

There are many other build phases, though most are not of interest to the
typical user:

  configure         Runs just cmake
  do_all            Runs makeall followed by proof
  gettext           Initialize gettext support
  makeall           Build every flavor there is
  products          Report the products directory path
  rsync             Rsync a copy of the source tree into Products
  sloc              Report total Source Lines Of Code
  submodule         Updates Git submodules (better to use 'pull')
  version           Output current HEAD version to version.m4

NOTE: If you wish to pass options to CMake or make, add "--" followed by
your options.  Those starting with "-D" or "--" will be passed on to CMake,
positional arguments and other options will be passed to make.
For the 'config' and 'configure' phase everything will be passed to CMake.

Here are some real-world examples:

  ./acprep
  ./acprep --python
  ./acprep opt make
  ./acprep make doc -- -DBUILD_WEB_DOCS=1""")
        sys.exit(0)

PrepareBuild().run()