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375 lines
14 KiB
Python
375 lines
14 KiB
Python
"""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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# created 2000/04/03, Greg Ward
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# (extricated from core.py; actually dates back to the beginning)
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__revision__ = "$Id$"
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import sys, os, string
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from types import *
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from distutils.errors import *
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from distutils import util
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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
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think of them as subroutines with local variables called
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"options". The options are "declared" in 'initialize_options()'
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and "defined" (given their final values, aka "finalized") in
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'finalize_options()', both of which must be defined by every
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command class. The distinction between the two is necessary
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because option values might come from the outside world (command
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line, option file, ...), and any options dependent on other
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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
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every command class."""
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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
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real initializer and depends on the actual command being
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instantiated."""
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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 fallback 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 complicatd -- hence "self.verbose"
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# (etc.) will be handled by __getattr__, below.
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self._verbose = None
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self._dry_run = None
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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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# 'ready' 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_ready()', which always
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# calls 'finalize_options()', to respect/update it.
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self.ready = 0
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# __init__ ()
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def __getattr__ (self, attr):
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if attr in ('verbose', '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_ready (self):
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if not self.ready:
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self.finalize_options ()
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self.ready = 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 overridden
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# by Distutils client, by command-line options, or by options
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# from option file
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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
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by the command-line supplied by the user; thus, this is
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not the place to code dependencies between options; generally,
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'initialize_options()' implementations are just a bunch
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of "self.foo = None" assignments.
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This method must be implemented by all command classes."""
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raise RuntimeError, \
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"abstract method -- subclass %s must override" % self.__class__
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def finalize_options (self):
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"""Set final values for all the options that this command
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supports. This is always called as late as possible, ie.
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after any option assignments from the command-line or from
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other commands have been done. Thus, this is the place to to
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code option dependencies: if 'foo' depends on 'bar', then it
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is safe to set 'foo' from 'bar' as long as 'foo' still has
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the same value it was assigned in 'initialize_options()'.
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This method must be implemented by all command classes."""
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raise RuntimeError, \
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"abstract method -- subclass %s must override" % self.__class__
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def run (self):
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"""A command's raison d'etre: carry out the action it exists
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to perform, controlled by the options initialized in
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'initialize_options()', customized by the user and other
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commands, and finalized in 'finalize_options()'. All
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terminal output and filesystem interaction should be done by
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'run()'.
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This method must be implemented by all command classes."""
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raise RuntimeError, \
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"abstract method -- subclass %s must override" % self.__class__
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def announce (self, msg, level=1):
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"""If the Distribution instance to which this command belongs
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has a verbosity level of greater than or equal to 'level'
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print 'msg' to stdout."""
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if self.verbose >= level:
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print msg
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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
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means "is None", which is the convention used to indicate
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that an option has not been changed between
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'set_initial_values()' and 'set_final_values()'. Usually
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called from 'set_final_values()' for options that depend on
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some other command rather than another option of the same
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command. 'src_cmd' is the other command from which option
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values will be taken (a command object will be created for it
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if necessary); the remaining arguments are
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'(src_option,dst_option)' tuples which mean "take the value
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of 'src_option' in the 'src_cmd' command object, and copy it
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to 'dst_option' in the current command object"."""
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# Option_pairs: list of (src_option, dst_option) tuples
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src_cmd_obj = self.distribution.find_command_obj (src_cmd)
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src_cmd_obj.ensure_ready ()
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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,
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getattr (src_cmd_obj, src_option))
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def find_peer (self, command, create=1):
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"""Wrapper around Distribution's 'find_command_obj()' method:
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find (create if necessary and 'create' is true) the command
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object for 'command'.."""
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cmd_obj = self.distribution.find_command_obj (command, create)
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cmd_obj.ensure_ready ()
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return cmd_obj
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def get_peer_option (self, command, option):
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"""Find or create the command object for 'command', and return
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its 'option' option."""
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cmd_obj = self.find_peer (command)
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return getattr(cmd_obj, option)
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def run_peer (self, command):
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"""Run some other command: uses the 'run_command()' method of
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Distribution, which creates the command object if necessary
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and then invokes its 'run()' method."""
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self.distribution.run_command (command)
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# -- External world manipulation -----------------------------------
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def warn (self, msg):
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sys.stderr.write ("warning: %s: %s\n" %
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(self.get_command_name(), msg))
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def execute (self, func, args, msg=None, level=1):
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"""Perform some action that affects the outside world (eg.
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by writing to the filesystem). Such actions are special because
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they should be disabled by the "dry run" flag, and should
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announce themselves if the current verbosity level is high
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enough. This method takes care of all that bureaucracy for you;
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all you have to do is supply the funtion to call and an argument
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tuple for it (to embody the "external action" being performed),
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a message to print if the verbosity level is high enough, and an
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optional verbosity threshold."""
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# Generate a message if we weren't passed one
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if msg is None:
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msg = "%s %s" % (func.__name__, `args`)
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if msg[-2:] == ',)': # correct for singleton tuple
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msg = msg[0:-2] + ')'
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# Print it if verbosity level is high enough
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self.announce (msg, level)
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# And do it, as long as we're not in dry-run mode
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if not self.dry_run:
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apply (func, args)
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# execute()
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def mkpath (self, name, mode=0777):
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util.mkpath (name, mode,
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self.verbose, self.dry_run)
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def copy_file (self, infile, outfile,
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preserve_mode=1, preserve_times=1, link=None, level=1):
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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 util.copy_file (infile, outfile,
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preserve_mode, preserve_times,
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not self.force,
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link,
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self.verbose >= level,
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self.dry_run)
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def copy_tree (self, infile, outfile,
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preserve_mode=1, preserve_times=1, preserve_symlinks=0,
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level=1):
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"""Copy an entire directory tree respecting verbose, dry-run,
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and force flags."""
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return util.copy_tree (infile, outfile,
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preserve_mode,preserve_times,preserve_symlinks,
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not self.force,
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self.verbose >= level,
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self.dry_run)
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def move_file (self, src, dst, level=1):
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"""Move a file respecting verbose and dry-run flags."""
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return util.move_file (src, dst,
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self.verbose >= level,
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self.dry_run)
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def spawn (self, cmd, search_path=1, level=1):
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from distutils.spawn import spawn
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spawn (cmd, search_path,
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self.verbose >= level,
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self.dry_run)
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def make_archive (self, base_name, format,
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root_dir=None, base_dir=None):
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util.make_archive (base_name, format, root_dir, base_dir,
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self.verbose, self.dry_run)
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def make_file (self, infiles, outfile, func, args,
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exec_msg=None, skip_msg=None, level=1):
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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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if exec_msg is None:
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exec_msg = "generating %s from %s" % \
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(outfile, string.join (infiles, ', '))
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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 type (infiles) is StringType:
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infiles = (infiles,)
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elif type (infiles) not in (ListType, TupleType):
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raise TypeError, \
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"'infiles' must be a string, or a list or tuple of strings"
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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 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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self.announce (skip_msg, level)
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# make_file ()
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# class Command
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class install_misc (Command):
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"""Common base class for installing some files in a subdirectory.
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Currently used by install_data and install_scripts.
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"""
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user_options = [('install-dir=', 'd', "directory to install the files to")]
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def initialize_options (self):
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self.install_dir = None
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self.outfiles = []
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def _install_dir_from (self, dirname):
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self.set_undefined_options('install', (dirname, 'install_dir'))
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def _copy_files (self, filelist):
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self.outfiles = []
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if not filelist:
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return
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self.mkpath(self.install_dir)
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for f in filelist:
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self.copy_file(f, self.install_dir)
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self.outfiles.append(os.path.join(self.install_dir, f))
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def get_outputs (self):
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return self.outfiles
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if __name__ == "__main__":
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print "ok"
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