text: # Copyright 2016-2018 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import time
  import sys, stat
  import datetime
  import os.path
  import platform
  import cProfile as profile
  import argparse
  
  from . import environment, interpreter, mesonlib
  from . import build
  from . import mlog, coredata
  from .mesonlib import MesonException
  
  def add_arguments(parser):
      coredata.register_builtin_arguments(parser)
      parser.add_argument('--cross-file', default=None,
                          help='File describing cross compilation environment.')
      parser.add_argument('--native-file',
                          default=[],
                          action='append',
                          help='File containing overrides for native compilation environment.')
      parser.add_argument('-v', '--version', action='version',
                          version=coredata.version)
      parser.add_argument('--profile-self', action='store_true', dest='profile',
                          help=argparse.SUPPRESS)
      parser.add_argument('--fatal-meson-warnings', action='store_true', dest='fatal_warnings',
                          help='Make all Meson warnings fatal')
      parser.add_argument('--reconfigure', action='store_true',
                          help='Set options and reconfigure the project. Useful when new ' +
                               'options have been added to the project and the default value ' +
                               'is not working.')
      parser.add_argument('--wipe', action='store_true',
                          help='Wipe build directory and reconfigure using previous command line options. ' +
                               'Userful when build directory got corrupted, or when rebuilding with a ' +
                               'newer version of meson.')
      parser.add_argument('builddir', nargs='?', default=None)
      parser.add_argument('sourcedir', nargs='?', default=None)
  
  class MesonApp:
      def __init__(self, options):
          (self.source_dir, self.build_dir) = self.validate_dirs(options.builddir,
                                                                 options.sourcedir,
                                                                 options.reconfigure,
                                                                 options.wipe)
  
          if options.wipe:
              # Make a copy of the cmd line file to make sure we can always
              # restore that file if anything bad happens. For example if
              # configuration fails we need to be able to wipe again.
              filename = coredata.get_cmd_line_file(self.build_dir)
              try:
                  with open(filename, 'r') as f:
                      content = f.read()
              except FileNotFoundError:
                  raise MesonException(
                      'Cannot find cmd_line.txt. This is probably because this '
                      'build directory was configured with a meson version < 0.49.0.')
  
              coredata.read_cmd_line_file(self.build_dir, options)
  
              try:
                  # Don't delete the whole tree, just all of the files and
                  # folders in the tree. Otherwise calling wipe form the builddir
                  # will cause a crash
                  for l in os.listdir(self.build_dir):
                      l = os.path.join(self.build_dir, l)
                      if os.path.isdir(l):
                          mesonlib.windows_proof_rmtree(l)
                      else:
                          mesonlib.windows_proof_rm(l)
              finally:
                  # Restore the file
                  path = os.path.dirname(filename)
                  os.makedirs(path, exist_ok=True)
                  with open(filename, 'w') as f:
                      f.write(content)
  
          self.options = options
  
      def has_build_file(self, dirname):
          fname = os.path.join(dirname, environment.build_filename)
          return os.path.exists(fname)
  
      def validate_core_dirs(self, dir1, dir2):
          if dir1 is None:
              if dir2 is None:
                  if not os.path.exists('meson.build') and os.path.exists('../meson.build'):
                      dir2 = '..'
                  else:
                      raise MesonException('Must specify at least one directory name.')
              dir1 = os.getcwd()
          if dir2 is None:
              dir2 = os.getcwd()
          ndir1 = os.path.abspath(os.path.realpath(dir1))
          ndir2 = os.path.abspath(os.path.realpath(dir2))
          if not os.path.exists(ndir1):
              os.makedirs(ndir1)
          if not os.path.exists(ndir2):
              os.makedirs(ndir2)
          if not stat.S_ISDIR(os.stat(ndir1).st_mode):
              raise MesonException('%s is not a directory' % dir1)
          if not stat.S_ISDIR(os.stat(ndir2).st_mode):
              raise MesonException('%s is not a directory' % dir2)
          if os.path.samefile(dir1, dir2):
              raise MesonException('Source and build directories must not be the same. Create a pristine build directory.')
          if self.has_build_file(ndir1):
              if self.has_build_file(ndir2):
                  raise MesonException('Both directories contain a build file %s.' % environment.build_filename)
              return ndir1, ndir2
          if self.has_build_file(ndir2):
              return ndir2, ndir1
          raise MesonException('Neither directory contains a build file %s.' % environment.build_filename)
  
      def validate_dirs(self, dir1, dir2, reconfigure, wipe):
          (src_dir, build_dir) = self.validate_core_dirs(dir1, dir2)
          priv_dir = os.path.join(build_dir, 'meson-private/coredata.dat')
          if os.path.exists(priv_dir):
              if not reconfigure and not wipe:
                  print('Directory already configured.\n'
                        '\nJust run your build command (e.g. ninja) and Meson will regenerate as necessary.\n'
                        'If ninja fails, run "ninja reconfigure" or "meson --reconfigure"\n'
                        'to force Meson to regenerate.\n'
                        '\nIf build failures persist, run "meson setup --wipe" to rebuild from scratch\n'
                        'using the same options as passed when configuring the build.'
                        '\nTo change option values, run "meson configure" instead.')
                  sys.exit(0)
          else:
              has_cmd_line_file = os.path.exists(coredata.get_cmd_line_file(build_dir))
              if (wipe and not has_cmd_line_file) or (not wipe and reconfigure):
                  print('Directory does not contain a valid build tree:\n{}'.format(build_dir))
                  sys.exit(1)
          return src_dir, build_dir
  
      def check_pkgconfig_envvar(self, env):
          curvar = os.environ.get('PKG_CONFIG_PATH', '')
          if curvar != env.coredata.pkgconf_envvar:
              mlog.warning('PKG_CONFIG_PATH has changed between invocations from "%s" to "%s".' %
                           (env.coredata.pkgconf_envvar, curvar))
              env.coredata.pkgconf_envvar = curvar
  
      def generate(self):
          env = environment.Environment(self.source_dir, self.build_dir, self.options)
          mlog.initialize(env.get_log_dir(), self.options.fatal_warnings)
          if self.options.profile:
              mlog.set_timestamp_start(time.monotonic())
          with mesonlib.BuildDirLock(self.build_dir):
              self._generate(env)
  
      def _generate(self, env):
          mlog.debug('Build started at', datetime.datetime.now().isoformat())
          mlog.debug('Main binary:', sys.executable)
          mlog.debug('Python system:', platform.system())
          mlog.log(mlog.bold('The Meson build system'))
          self.check_pkgconfig_envvar(env)
          mlog.log('Version:', coredata.version)
          mlog.log('Source dir:', mlog.bold(self.source_dir))
          mlog.log('Build dir:', mlog.bold(self.build_dir))
          if env.is_cross_build():
              mlog.log('Build type:', mlog.bold('cross build'))
          else:
              mlog.log('Build type:', mlog.bold('native build'))
          b = build.Build(env)
  
          intr = interpreter.Interpreter(b)
          if env.is_cross_build():
              mlog.log('Host machine cpu family:', mlog.bold(intr.builtin['host_machine'].cpu_family_method([], {})))
              mlog.log('Host machine cpu:', mlog.bold(intr.builtin['host_machine'].cpu_method([], {})))
              mlog.log('Target machine cpu family:', mlog.bold(intr.builtin['target_machine'].cpu_family_method([], {})))
              mlog.log('Target machine cpu:', mlog.bold(intr.builtin['target_machine'].cpu_method([], {})))
          mlog.log('Build machine cpu family:', mlog.bold(intr.builtin['build_machine'].cpu_family_method([], {})))
          mlog.log('Build machine cpu:', mlog.bold(intr.builtin['build_machine'].cpu_method([], {})))
          if self.options.profile:
              fname = os.path.join(self.build_dir, 'meson-private', 'profile-interpreter.log')
              profile.runctx('intr.run()', globals(), locals(), filename=fname)
          else:
              intr.run()
          # Print all default option values that don't match the current value
          for def_opt_name, def_opt_value, cur_opt_value in intr.get_non_matching_default_options():
              mlog.log('Option', mlog.bold(def_opt_name), 'is:',
                       mlog.bold(str(cur_opt_value)),
                       '[default: {}]'.format(str(def_opt_value)))
          try:
              dumpfile = os.path.join(env.get_scratch_dir(), 'build.dat')
              # We would like to write coredata as late as possible since we use the existence of
              # this file to check if we generated the build file successfully. Since coredata
              # includes settings, the build files must depend on it and appear newer. However, due
              # to various kernel caches, we cannot guarantee that any time in Python is exactly in
              # sync with the time that gets applied to any files. Thus, we dump this file as late as
              # possible, but before build files, and if any error occurs, delete it.
              cdf = env.dump_coredata()
              if self.options.profile:
                  fname = 'profile-{}-backend.log'.format(intr.backend.name)
                  fname = os.path.join(self.build_dir, 'meson-private', fname)
                  profile.runctx('intr.backend.generate(intr)', globals(), locals(), filename=fname)
              else:
                  intr.backend.generate(intr)
              build.save(b, dumpfile)
              # Post-conf scripts must be run after writing coredata or else introspection fails.
              intr.backend.run_postconf_scripts()
              if env.first_invocation:
                  coredata.write_cmd_line_file(self.build_dir, self.options)
              else:
                  coredata.update_cmd_line_file(self.build_dir, self.options)
          except:
              if 'cdf' in locals():
                  old_cdf = cdf + '.prev'
                  if os.path.exists(old_cdf):
                      os.replace(old_cdf, cdf)
                  else:
                      os.unlink(cdf)
              raise
  
  def run(options):
      coredata.parse_cmd_line_options(options)
      app = MesonApp(options)
      app.generate()
      return 0
  