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This allows additional commands to be provided for existing setup.py 

scripts without modifying either the distutils installation or the
setup.py scripts of packages with which the new commands will be used.

Specifically, an option is added to distutils that allows additional
packages to be searched for command implementations in addition to
distutils.command.  The additional packages can be specified on the
command line or via the installation or personal configuration files
already loaded by distutils.

For discussion, see the thread starting with:

http://mail.python.org/pipermail/distutils-sig/2004-August/004112.html

This closes SF patch #102241.
This commit is contained in:
Fred Drake 2004-08-03 16:37:40 +00:00
parent 4818748b87
commit d04573fef0
3 changed files with 192 additions and 21 deletions
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31
Doc/dist/dist.tex vendored
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@ -1946,6 +1946,37 @@ This approach is most valuable if the new implementations must be used
to use a particular package, as everyone interested in the package
will need to have the new command implementation.
Beginning with Python 2.4, a third option is available, intended to
allow new commands to be added which can support existing
\file{setup.py} scripts without requiring modifications to the Python
installation. This is expected to allow third-party extensions to
provide support for additional packaging systems, but the commands can
be used for anything distutils commands can be used for. A new
configuration option, \option{command\_packages} (command-line option
\longprogramopt{command-packages}), can be used to specify additional
packages to be searched for modules implementing commands. Like all
distutils options, this can be specified on the command line or in a
configuration file. This option can only be set in the
\code{[global]} section of a configuration file, or before any
commands on the command line. If set in a configuration file, it can
be overridden from the command line; setting it to an empty string on
the command line causes the default to be used. This should never be
set in a configuration file provided with a package.
This new option can be used to add any number of packages to the list
of packages searched for command implementations; multiple package
names should be separated by commas. When not specified, the search
is only performed in the \module{distutils.command} package. When
\file{setup.py} is run with the option
\longprogramopt{command-packages} \programopt{distcmds,buildcmds},
however, the packages \module{distutils.command}, \module{distcmds},
and \module{buildcmds} will be searched in that order. New commands
are expected to be implemented in modules of the same name as the
command by classes sharing the same name. Given the example command
line option above, the command \command{bdist\_openpkg} could be
implemented by the class \class{distcmds.bdist_openpkg.bdist_openpkg}
or \class{buildcmds.bdist_openpkg.bdist_openpkg}.
\chapter{Command Reference}
\label{reference}

82
Lib/distutils/dist.py
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@ -141,6 +141,14 @@ class Distribution:
# for the setup script to override command classes
self.cmdclass = {}
# 'command_packages' is a list of packages in which commands
# are searched for. The factory for command 'foo' is expected
# to be named 'foo' in the module 'foo' in one of the packages
# named here. This list is searched from the left; an error
# is raised if no named package provides the command being
# searched for. (Always access using get_command_packages().)
self.command_packages = None
# 'script_name' and 'script_args' are usually set to sys.argv[0]
# and sys.argv[1:], but they can be overridden when the caller is
# not necessarily a setup script run from the command-line.
@ -406,6 +414,8 @@ class Distribution:
setattr(self, alias, not strtobool(val))
elif opt in ('verbose', 'dry_run'): # ugh!
setattr(self, opt, strtobool(val))
else:
setattr(self, opt, val)
except ValueError, msg:
raise DistutilsOptionError, msg
@ -437,11 +447,12 @@ class Distribution:
# We now have enough information to show the Macintosh dialog
# that allows the user to interactively specify the "command line".
#
toplevel_options = self._get_toplevel_options()
if sys.platform == 'mac':
import EasyDialogs
cmdlist = self.get_command_list()
self.script_args = EasyDialogs.GetArgv(
self.global_options + self.display_options, cmdlist)
toplevel_options + self.display_options, cmdlist)
# We have to parse the command line a bit at a time -- global
# options, then the first command, then its options, and so on --
@ -451,7 +462,7 @@ class Distribution:
# until we know what the command is.
self.commands = []
parser = FancyGetopt(self.global_options + self.display_options)
parser = FancyGetopt(toplevel_options + self.display_options)
parser.set_negative_aliases(self.negative_opt)
parser.set_aliases({'licence': 'license'})
args = parser.getopt(args=self.script_args, object=self)
@ -488,6 +499,17 @@ class Distribution:
# parse_command_line()
def _get_toplevel_options (self):
"""Return the non-display options recognized at the top level.
This includes options that are recognized *only* at the top
level as well as options recognized for commands.
"""
return self.global_options + [
("command-packages=", None,
"list of packages that provide distutils commands"),
]
def _parse_command_opts (self, parser, args):
"""Parse the command-line options for a single command.
'parser' must be a FancyGetopt instance; 'args' must be the list
@ -586,7 +608,6 @@ class Distribution:
# _parse_command_opts ()
def finalize_options (self):
"""Set final values for all the options on the Distribution
instance, analogous to the .finalize_options() method of Command
@ -627,7 +648,11 @@ class Distribution:
from distutils.cmd import Command
if global_options:
parser.set_option_table(self.global_options)
if display_options:
options = self._get_toplevel_options()
else:
options = self.global_options
parser.set_option_table(options)
parser.print_help("Global options:")
print
@ -791,6 +816,19 @@ class Distribution:
# -- Command class/object methods ----------------------------------
def get_command_packages (self):
"""Return a list of packages from which commands are loaded."""
pkgs = self.command_packages
if not isinstance(pkgs, type([])):
pkgs = string.split(pkgs or "", ",")
for i in range(len(pkgs)):
pkgs[i] = string.strip(pkgs[i])
pkgs = filter(None, pkgs)
if "distutils.command" not in pkgs:
pkgs.insert(0, "distutils.command")
self.command_packages = pkgs
return pkgs
def get_command_class (self, command):
"""Return the class that implements the Distutils command named by
'command'. First we check the 'cmdclass' dictionary; if the
@ -807,26 +845,28 @@ class Distribution:
if klass:
return klass
module_name = 'distutils.command.' + command
klass_name = command
for pkgname in self.get_command_packages():
module_name = "%s.%s" % (pkgname, command)
klass_name = command
try:
__import__ (module_name)
module = sys.modules[module_name]
except ImportError:
raise DistutilsModuleError, \
"invalid command '%s' (no module named '%s')" % \
(command, module_name)
try:
__import__ (module_name)
module = sys.modules[module_name]
except ImportError:
continue
try:
klass = getattr(module, klass_name)
except AttributeError:
raise DistutilsModuleError, \
"invalid command '%s' (no class '%s' in module '%s')" \
% (command, klass_name, module_name)
try:
klass = getattr(module, klass_name)
except AttributeError:
raise DistutilsModuleError, \
"invalid command '%s' (no class '%s' in module '%s')" \
% (command, klass_name, module_name)
self.cmdclass[command] = klass
return klass
raise DistutilsModuleError("invalid command '%s'" % command)
self.cmdclass[command] = klass
return klass
# get_command_class ()

100
Lib/distutils/tests/test_dist.py Normal file
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@ -0,0 +1,100 @@
"""Tests for distutils.dist."""
import distutils.cmd
import distutils.dist
import os
import shutil
import sys
import tempfile
import unittest
from test.test_support import TESTFN
class test_dist(distutils.cmd.Command):
"""Sample distutils extension command."""
user_options = [
("sample-option=", "S", "help text"),
]
def initialize_options(self):
self.sample_option = None
class TestDistribution(distutils.dist.Distribution):
"""Distribution subclasses that avoids the default search for
configuration files.
The ._config_files attribute must be set before
.parse_config_files() is called.
"""
def find_config_files(self):
return self._config_files
class DistributionTestCase(unittest.TestCase):
def setUp(self):
self.argv = sys.argv[:]
del sys.argv[1:]
def tearDown(self):
sys.argv[:] = self.argv
def create_distribution(self, configfiles=()):
d = TestDistribution()
d._config_files = configfiles
d.parse_config_files()
d.parse_command_line()
return d
def test_command_packages_unspecified(self):
sys.argv.append("build")
d = self.create_distribution()
self.assertEqual(d.get_command_packages(), ["distutils.command"])
def test_command_packages_cmdline(self):
sys.argv.extend(["--command-packages",
"foo.bar,distutils.tests",
"test_dist",
"-Ssometext",
])
d = self.create_distribution()
# let's actually try to load our test command:
self.assertEqual(d.get_command_packages(),
["distutils.command", "foo.bar", "distutils.tests"])
cmd = d.get_command_obj("test_dist")
self.assert_(isinstance(cmd, test_dist))
self.assertEqual(cmd.sample_option, "sometext")
def test_command_packages_configfile(self):
sys.argv.append("build")
f = open(TESTFN, "w")
try:
print >>f, "[global]"
print >>f, "command_packages = foo.bar, splat"
f.close()
d = self.create_distribution([TESTFN])
self.assertEqual(d.get_command_packages(),
["distutils.command", "foo.bar", "splat"])
# ensure command line overrides config:
sys.argv[1:] = ["--command-packages", "spork", "build"]
d = self.create_distribution([TESTFN])
self.assertEqual(d.get_command_packages(),
["distutils.command", "spork"])
# Setting --command-packages to '' should cause the default to
# be used even if a config file specified something else:
sys.argv[1:] = ["--command-packages", "", "build"]
d = self.create_distribution([TESTFN])
self.assertEqual(d.get_command_packages(), ["distutils.command"])
finally:
os.unlink(TESTFN)
def test_suite():
return unittest.makeSuite(DistributionTestCase)