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install_lib.py8.2 KB · 218 lines
"""distutils.command.install_lib Implements the Distutils 'install_lib' command(install all Python modules).""" import osimport importlib.utilimport sys from distutils.core import Commandfrom distutils.errors import DistutilsOptionError  # Extension for Python source files.PYTHON_SOURCE_EXTENSION = ".py" class install_lib(Command):     description = "install all Python modules (extensions and pure Python)"     # The byte-compilation options are a tad confusing.  Here are the    # possible scenarios:    #   1) no compilation at all (--no-compile --no-optimize)    #   2) compile .pyc only (--compile --no-optimize; default)    #   3) compile .pyc and "opt-1" .pyc (--compile --optimize)    #   4) compile "opt-1" .pyc only (--no-compile --optimize)    #   5) compile .pyc and "opt-2" .pyc (--compile --optimize-more)    #   6) compile "opt-2" .pyc only (--no-compile --optimize-more)    #    # The UI for this is two options, 'compile' and 'optimize'.    # 'compile' is strictly boolean, and only decides whether to    # generate .pyc files.  'optimize' is three-way (0, 1, or 2), and    # decides both whether to generate .pyc files and what level of    # optimization to use.     user_options = [        ('install-dir=', 'd', "directory to install to"),        ('build-dir=','b', "build directory (where to install from)"),        ('force', 'f', "force installation (overwrite existing files)"),        ('compile', 'c', "compile .py to .pyc [default]"),        ('no-compile', None, "don't compile .py files"),        ('optimize=', 'O',         "also compile with optimization: -O1 for \"python -O\", "         "-O2 for \"python -OO\", and -O0 to disable [default: -O0]"),        ('skip-build', None, "skip the build steps"),        ]     boolean_options = ['force', 'compile', 'skip-build']    negative_opt = {'no-compile' : 'compile'}     def initialize_options(self):        # let the 'install' command dictate our installation directory        self.install_dir = None        self.build_dir = None        self.force = 0        self.compile = None        self.optimize = None        self.skip_build = None     def finalize_options(self):        # Get all the information we need to install pure Python modules        # from the umbrella 'install' command -- build (source) directory,        # install (target) directory, and whether to compile .py files.        self.set_undefined_options('install',                                   ('build_lib', 'build_dir'),                                   ('install_lib', 'install_dir'),                                   ('force', 'force'),                                   ('compile', 'compile'),                                   ('optimize', 'optimize'),                                   ('skip_build', 'skip_build'),                                  )         if self.compile is None:            self.compile = True        if self.optimize is None:            self.optimize = False         if not isinstance(self.optimize, int):            try:                self.optimize = int(self.optimize)                if self.optimize not in (0, 1, 2):                    raise AssertionError            except (ValueError, AssertionError):                raise DistutilsOptionError("optimize must be 0, 1, or 2")     def run(self):        # Make sure we have built everything we need first        self.build()         # Install everything: simply dump the entire contents of the build        # directory to the installation directory (that's the beauty of        # having a build directory!)        outfiles = self.install()         # (Optionally) compile .py to .pyc        if outfiles is not None and self.distribution.has_pure_modules():            self.byte_compile(outfiles)     # -- Top-level worker functions ------------------------------------    # (called from 'run()')     def build(self):        if not self.skip_build:            if self.distribution.has_pure_modules():                self.run_command('build_py')            if self.distribution.has_ext_modules():                self.run_command('build_ext')     def install(self):        if os.path.isdir(self.build_dir):            outfiles = self.copy_tree(self.build_dir, self.install_dir)        else:            self.warn("'%s' does not exist -- no Python modules to install" %                      self.build_dir)            return        return outfiles     def byte_compile(self, files):        if sys.dont_write_bytecode:            self.warn('byte-compiling is disabled, skipping.')            return         from distutils.util import byte_compile         # Get the "--root" directory supplied to the "install" command,        # and use it as a prefix to strip off the purported filename        # encoded in bytecode files.  This is far from complete, but it        # should at least generate usable bytecode in RPM distributions.        install_root = self.get_finalized_command('install').root         if self.compile:            byte_compile(files, optimize=0,                         force=self.force, prefix=install_root,                         dry_run=self.dry_run)        if self.optimize > 0:            byte_compile(files, optimize=self.optimize,                         force=self.force, prefix=install_root,                         verbose=self.verbose, dry_run=self.dry_run)      # -- Utility methods -----------------------------------------------     def _mutate_outputs(self, has_any, build_cmd, cmd_option, output_dir):        if not has_any:            return []         build_cmd = self.get_finalized_command(build_cmd)        build_files = build_cmd.get_outputs()        build_dir = getattr(build_cmd, cmd_option)         prefix_len = len(build_dir) + len(os.sep)        outputs = []        for file in build_files:            outputs.append(os.path.join(output_dir, file[prefix_len:]))         return outputs     def _bytecode_filenames(self, py_filenames):        bytecode_files = []        for py_file in py_filenames:            # Since build_py handles package data installation, the            # list of outputs can contain more than just .py files.            # Make sure we only report bytecode for the .py files.            ext = os.path.splitext(os.path.normcase(py_file))[1]            if ext != PYTHON_SOURCE_EXTENSION:                continue            if self.compile:                bytecode_files.append(importlib.util.cache_from_source(                    py_file, optimization=''))            if self.optimize > 0:                bytecode_files.append(importlib.util.cache_from_source(                    py_file, optimization=self.optimize))         return bytecode_files      # -- External interface --------------------------------------------    # (called by outsiders)     def get_outputs(self):        """Return the list of files that would be installed if this command        were actually run.  Not affected by the "dry-run" flag or whether        modules have actually been built yet.        """        pure_outputs = \            self._mutate_outputs(self.distribution.has_pure_modules(),                                 'build_py', 'build_lib',                                 self.install_dir)        if self.compile:            bytecode_outputs = self._bytecode_filenames(pure_outputs)        else:            bytecode_outputs = []         ext_outputs = \            self._mutate_outputs(self.distribution.has_ext_modules(),                                 'build_ext', 'build_lib',                                 self.install_dir)         return pure_outputs + bytecode_outputs + ext_outputs     def get_inputs(self):        """Get the list of files that are input to this command, ie. the        files that get installed as they are named in the build tree.        The files in this list correspond one-to-one to the output        filenames returned by 'get_outputs()'.        """        inputs = []         if self.distribution.has_pure_modules():            build_py = self.get_finalized_command('build_py')            inputs.extend(build_py.get_outputs())         if self.distribution.has_ext_modules():            build_ext = self.get_finalized_command('build_ext')            inputs.extend(build_ext.get_outputs())         return inputs