initial commit
This commit is contained in:
klein panic
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"""distutils.cmd
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Provides the Command class, the base class for the command classes
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in the distutils.command package.
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"""
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import sys
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import os
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import re
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import logging
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from .errors import DistutilsOptionError
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from . import util, dir_util, file_util, archive_util, dep_util
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from ._log import log
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class Command:
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"""Abstract base class for defining command classes, the "worker bees"
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of the Distutils. A useful analogy for command classes is to think of
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them as subroutines with local variables called "options". The options
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are "declared" in 'initialize_options()' and "defined" (given their
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final values, aka "finalized") in 'finalize_options()', both of which
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must be defined by every command class. The distinction between the
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two is necessary because option values might come from the outside
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world (command line, config file, ...), and any options dependent on
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other options must be computed *after* these outside influences have
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been processed -- hence 'finalize_options()'. The "body" of the
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subroutine, where it does all its work based on the values of its
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options, is the 'run()' method, which must also be implemented by every
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command class.
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"""
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# 'sub_commands' formalizes the notion of a "family" of commands,
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# eg. "install" as the parent with sub-commands "install_lib",
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# "install_headers", etc. The parent of a family of commands
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# defines 'sub_commands' as a class attribute; it's a list of
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# (command_name : string, predicate : unbound_method | string | None)
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# tuples, where 'predicate' is a method of the parent command that
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# determines whether the corresponding command is applicable in the
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# current situation. (Eg. we "install_headers" is only applicable if
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# we have any C header files to install.) If 'predicate' is None,
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# that command is always applicable.
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#
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# 'sub_commands' is usually defined at the *end* of a class, because
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# predicates can be unbound methods, so they must already have been
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# defined. The canonical example is the "install" command.
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sub_commands = []
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# -- Creation/initialization methods -------------------------------
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def __init__(self, dist):
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"""Create and initialize a new Command object. Most importantly,
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invokes the 'initialize_options()' method, which is the real
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initializer and depends on the actual command being
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instantiated.
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"""
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# late import because of mutual dependence between these classes
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from distutils.dist import Distribution
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if not isinstance(dist, Distribution):
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raise TypeError("dist must be a Distribution instance")
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if self.__class__ is Command:
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raise RuntimeError("Command is an abstract class")
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self.distribution = dist
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self.initialize_options()
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# Per-command versions of the global flags, so that the user can
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# customize Distutils' behaviour command-by-command and let some
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# commands fall back on the Distribution's behaviour. None means
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# "not defined, check self.distribution's copy", while 0 or 1 mean
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# false and true (duh). Note that this means figuring out the real
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# value of each flag is a touch complicated -- hence "self._dry_run"
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# will be handled by __getattr__, below.
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# XXX This needs to be fixed.
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self._dry_run = None
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# verbose is largely ignored, but needs to be set for
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# backwards compatibility (I think)?
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self.verbose = dist.verbose
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# Some commands define a 'self.force' option to ignore file
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# timestamps, but methods defined *here* assume that
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# 'self.force' exists for all commands. So define it here
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# just to be safe.
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self.force = None
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# The 'help' flag is just used for command-line parsing, so
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# none of that complicated bureaucracy is needed.
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self.help = 0
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# 'finalized' records whether or not 'finalize_options()' has been
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# called. 'finalize_options()' itself should not pay attention to
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# this flag: it is the business of 'ensure_finalized()', which
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# always calls 'finalize_options()', to respect/update it.
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self.finalized = 0
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# XXX A more explicit way to customize dry_run would be better.
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def __getattr__(self, attr):
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if attr == 'dry_run':
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myval = getattr(self, "_" + attr)
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if myval is None:
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return getattr(self.distribution, attr)
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else:
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return myval
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else:
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raise AttributeError(attr)
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def ensure_finalized(self):
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if not self.finalized:
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self.finalize_options()
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self.finalized = 1
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# Subclasses must define:
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# initialize_options()
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# provide default values for all options; may be customized by
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# setup script, by options from config file(s), or by command-line
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# options
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# finalize_options()
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# decide on the final values for all options; this is called
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# after all possible intervention from the outside world
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# (command-line, option file, etc.) has been processed
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# run()
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# run the command: do whatever it is we're here to do,
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# controlled by the command's various option values
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def initialize_options(self):
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"""Set default values for all the options that this command
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supports. Note that these defaults may be overridden by other
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commands, by the setup script, by config files, or by the
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command-line. Thus, this is not the place to code dependencies
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between options; generally, 'initialize_options()' implementations
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are just a bunch of "self.foo = None" assignments.
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This method must be implemented by all command classes.
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"""
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raise RuntimeError(
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"abstract method -- subclass %s must override" % self.__class__
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)
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def finalize_options(self):
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"""Set final values for all the options that this command supports.
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This is always called as late as possible, ie. after any option
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assignments from the command-line or from other commands have been
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done. Thus, this is the place to code option dependencies: if
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'foo' depends on 'bar', then it is safe to set 'foo' from 'bar' as
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long as 'foo' still has the same value it was assigned in
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'initialize_options()'.
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This method must be implemented by all command classes.
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"""
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raise RuntimeError(
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"abstract method -- subclass %s must override" % self.__class__
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)
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def dump_options(self, header=None, indent=""):
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from distutils.fancy_getopt import longopt_xlate
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if header is None:
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header = "command options for '%s':" % self.get_command_name()
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self.announce(indent + header, level=logging.INFO)
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indent = indent + " "
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for (option, _, _) in self.user_options:
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option = option.translate(longopt_xlate)
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if option[-1] == "=":
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option = option[:-1]
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value = getattr(self, option)
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self.announce(indent + "{} = {}".format(option, value), level=logging.INFO)
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def run(self):
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"""A command's raison d'etre: carry out the action it exists to
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perform, controlled by the options initialized in
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'initialize_options()', customized by other commands, the setup
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script, the command-line, and config files, and finalized in
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'finalize_options()'. All terminal output and filesystem
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interaction should be done by 'run()'.
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This method must be implemented by all command classes.
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"""
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raise RuntimeError(
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"abstract method -- subclass %s must override" % self.__class__
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)
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def announce(self, msg, level=logging.DEBUG):
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log.log(level, msg)
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def debug_print(self, msg):
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"""Print 'msg' to stdout if the global DEBUG (taken from the
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DISTUTILS_DEBUG environment variable) flag is true.
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"""
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from distutils.debug import DEBUG
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if DEBUG:
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print(msg)
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sys.stdout.flush()
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# -- Option validation methods -------------------------------------
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# (these are very handy in writing the 'finalize_options()' method)
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#
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# NB. the general philosophy here is to ensure that a particular option
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# value meets certain type and value constraints. If not, we try to
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# force it into conformance (eg. if we expect a list but have a string,
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# split the string on comma and/or whitespace). If we can't force the
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# option into conformance, raise DistutilsOptionError. Thus, command
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# classes need do nothing more than (eg.)
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# self.ensure_string_list('foo')
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# and they can be guaranteed that thereafter, self.foo will be
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# a list of strings.
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def _ensure_stringlike(self, option, what, default=None):
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val = getattr(self, option)
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if val is None:
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setattr(self, option, default)
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return default
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elif not isinstance(val, str):
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raise DistutilsOptionError(
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"'{}' must be a {} (got `{}`)".format(option, what, val)
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)
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return val
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def ensure_string(self, option, default=None):
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"""Ensure that 'option' is a string; if not defined, set it to
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'default'.
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"""
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self._ensure_stringlike(option, "string", default)
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def ensure_string_list(self, option):
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r"""Ensure that 'option' is a list of strings. If 'option' is
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currently a string, we split it either on /,\s*/ or /\s+/, so
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"foo bar baz", "foo,bar,baz", and "foo, bar baz" all become
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["foo", "bar", "baz"].
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"""
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val = getattr(self, option)
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if val is None:
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return
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elif isinstance(val, str):
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setattr(self, option, re.split(r',\s*|\s+', val))
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else:
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if isinstance(val, list):
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ok = all(isinstance(v, str) for v in val)
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else:
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ok = False
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if not ok:
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raise DistutilsOptionError(
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"'{}' must be a list of strings (got {!r})".format(option, val)
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)
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def _ensure_tested_string(self, option, tester, what, error_fmt, default=None):
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val = self._ensure_stringlike(option, what, default)
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if val is not None and not tester(val):
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raise DistutilsOptionError(
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("error in '%s' option: " + error_fmt) % (option, val)
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)
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def ensure_filename(self, option):
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"""Ensure that 'option' is the name of an existing file."""
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self._ensure_tested_string(
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option, os.path.isfile, "filename", "'%s' does not exist or is not a file"
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)
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def ensure_dirname(self, option):
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self._ensure_tested_string(
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option,
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os.path.isdir,
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"directory name",
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"'%s' does not exist or is not a directory",
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)
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# -- Convenience methods for commands ------------------------------
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def get_command_name(self):
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if hasattr(self, 'command_name'):
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return self.command_name
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else:
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return self.__class__.__name__
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def set_undefined_options(self, src_cmd, *option_pairs):
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"""Set the values of any "undefined" options from corresponding
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option values in some other command object. "Undefined" here means
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"is None", which is the convention used to indicate that an option
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has not been changed between 'initialize_options()' and
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'finalize_options()'. Usually called from 'finalize_options()' for
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options that depend on some other command rather than another
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option of the same command. 'src_cmd' is the other command from
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which option values will be taken (a command object will be created
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for it if necessary); the remaining arguments are
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'(src_option,dst_option)' tuples which mean "take the value of
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'src_option' in the 'src_cmd' command object, and copy it to
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'dst_option' in the current command object".
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"""
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# Option_pairs: list of (src_option, dst_option) tuples
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src_cmd_obj = self.distribution.get_command_obj(src_cmd)
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src_cmd_obj.ensure_finalized()
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for (src_option, dst_option) in option_pairs:
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if getattr(self, dst_option) is None:
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setattr(self, dst_option, getattr(src_cmd_obj, src_option))
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def get_finalized_command(self, command, create=1):
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"""Wrapper around Distribution's 'get_command_obj()' method: find
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(create if necessary and 'create' is true) the command object for
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'command', call its 'ensure_finalized()' method, and return the
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finalized command object.
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"""
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cmd_obj = self.distribution.get_command_obj(command, create)
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cmd_obj.ensure_finalized()
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return cmd_obj
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# XXX rename to 'get_reinitialized_command()'? (should do the
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# same in dist.py, if so)
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def reinitialize_command(self, command, reinit_subcommands=0):
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return self.distribution.reinitialize_command(command, reinit_subcommands)
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def run_command(self, command):
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"""Run some other command: uses the 'run_command()' method of
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Distribution, which creates and finalizes the command object if
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necessary and then invokes its 'run()' method.
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"""
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self.distribution.run_command(command)
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def get_sub_commands(self):
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"""Determine the sub-commands that are relevant in the current
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distribution (ie., that need to be run). This is based on the
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'sub_commands' class attribute: each tuple in that list may include
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a method that we call to determine if the subcommand needs to be
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run for the current distribution. Return a list of command names.
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"""
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commands = []
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for (cmd_name, method) in self.sub_commands:
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if method is None or method(self):
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commands.append(cmd_name)
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return commands
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# -- External world manipulation -----------------------------------
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def warn(self, msg):
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log.warning("warning: %s: %s\n", self.get_command_name(), msg)
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def execute(self, func, args, msg=None, level=1):
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util.execute(func, args, msg, dry_run=self.dry_run)
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def mkpath(self, name, mode=0o777):
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dir_util.mkpath(name, mode, dry_run=self.dry_run)
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def copy_file(
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self, infile, outfile, preserve_mode=1, preserve_times=1, link=None, level=1
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):
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"""Copy a file respecting verbose, dry-run and force flags. (The
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former two default to whatever is in the Distribution object, and
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the latter defaults to false for commands that don't define it.)"""
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return file_util.copy_file(
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infile,
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outfile,
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preserve_mode,
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preserve_times,
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not self.force,
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link,
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dry_run=self.dry_run,
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)
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def copy_tree(
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self,
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infile,
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outfile,
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preserve_mode=1,
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preserve_times=1,
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preserve_symlinks=0,
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level=1,
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):
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"""Copy an entire directory tree respecting verbose, dry-run,
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and force flags.
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"""
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return dir_util.copy_tree(
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infile,
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outfile,
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preserve_mode,
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preserve_times,
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preserve_symlinks,
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not self.force,
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dry_run=self.dry_run,
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)
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def move_file(self, src, dst, level=1):
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"""Move a file respecting dry-run flag."""
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return file_util.move_file(src, dst, dry_run=self.dry_run)
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def spawn(self, cmd, search_path=1, level=1):
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"""Spawn an external command respecting dry-run flag."""
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from distutils.spawn import spawn
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spawn(cmd, search_path, dry_run=self.dry_run)
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def make_archive(
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self, base_name, format, root_dir=None, base_dir=None, owner=None, group=None
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):
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return archive_util.make_archive(
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base_name,
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format,
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root_dir,
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base_dir,
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dry_run=self.dry_run,
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owner=owner,
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group=group,
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)
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def make_file(
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self, infiles, outfile, func, args, exec_msg=None, skip_msg=None, level=1
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):
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"""Special case of 'execute()' for operations that process one or
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more input files and generate one output file. Works just like
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'execute()', except the operation is skipped and a different
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message printed if 'outfile' already exists and is newer than all
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files listed in 'infiles'. If the command defined 'self.force',
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and it is true, then the command is unconditionally run -- does no
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timestamp checks.
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"""
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if skip_msg is None:
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skip_msg = "skipping %s (inputs unchanged)" % outfile
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# Allow 'infiles' to be a single string
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if isinstance(infiles, str):
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infiles = (infiles,)
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elif not isinstance(infiles, (list, tuple)):
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raise TypeError("'infiles' must be a string, or a list or tuple of strings")
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if exec_msg is None:
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exec_msg = "generating {} from {}".format(outfile, ', '.join(infiles))
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# If 'outfile' must be regenerated (either because it doesn't
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# exist, is out-of-date, or the 'force' flag is true) then
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# perform the action that presumably regenerates it
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if self.force or dep_util.newer_group(infiles, outfile):
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self.execute(func, args, exec_msg, level)
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# Otherwise, print the "skip" message
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else:
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log.debug(skip_msg)
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