cpython/Lib/distutils/command/checkdep.py
Anthony Baxter 05f842bae2 Basic dependency checking. setup() has two new optional arguments
requires and provides. requires is a sequence of strings, of the
form 'packagename-version'. The dependency checking so far merely
does an '__import__(packagename)' and checks for packagename.__version__
You can also leave off the version, and any version of the package
will be installed.
There's a special case for the package 'python' - sys.version_info
is used, so
requires= ( 'python-2.3', )
just works.

Provides is of the same format as requires - but if it's not supplied,
a provides is generated by adding the version to each entry in packages,
or modules if packages isn't there.
Provides is currently only used in the PKG-INFO file. Shortly, PyPI
will grow the ability to accept these lines, and register will be
updated to send them.

There's a new command 'checkdep' command that runs these checks.
For this version, only greater-than-or-equal checking is done. We'll
add the ability to specify an optional operator later.
2004-03-22 22:22:05 +00:00

70 lines
1.9 KiB
Python

"""distutils.command.x
Implements the Distutils 'x' command.
"""
# created 2000/mm/dd, John Doe
__revision__ = "$Id$"
from distutils.core import Command
class DependencyFailure(Exception): pass
class VersionTooOld(DependencyFailure): pass
class VersionNotKnown(DependencyFailure): pass
class checkdep (Command):
# Brief (40-50 characters) description of the command
description = "check package dependencies"
# List of option tuples: long name, short name (None if no short
# name), and help string.
# Later on, we might have auto-fetch and the like here. Feel free.
user_options = []
def initialize_options (self):
self.debug = None
# initialize_options()
def finalize_options (self):
pass
# finalize_options()
def run (self):
from distutils.version import LooseVersion
failed = []
for pkg, ver in self.distribution.metadata.requires:
if pkg == 'python':
if ver is not None:
# Special case the 'python' package
import sys
thisver = LooseVersion('%d.%d.%d'%sys.version_info[:3])
if thisver < ver:
failed.append(((pkg,ver), VersionTooOld(thisver)))
continue
# Kinda hacky - we should do more here
try:
mod = __import__(pkg)
except Exception, e:
failed.append(((pkg,ver), e))
continue
if ver is not None:
if hasattr(mod, '__version__'):
thisver = LooseVersion(mod.__version__)
if thisver < ver:
failed.append(((pkg,ver), VersionTooOld(thisver)))
else:
failed.append(((pkg,ver), VersionNotKnown()))
if failed:
raise DependencyFailure, failed
# run()
# class x