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