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distutils.util.get_platform() normally reports the minimum version
of macOS that would be required to *use* extensions produced by
distutils. But what we want when checking compatibility is to know the
version of macOS that we are *running*. To allow usage of packages that
explicitly require a newer version of macOS, we must also know the
current version of the OS.
If this condition occurs for any other platform with a version in its
platform strings, this function should be extended accordingly.
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(This is because ``sys.path`` can contain the same value more than
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If `entry` is unspecified, it defaults to the ``.location`` of `dist`.
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set's ``.entries`` (if it wasn't already present).
`dist` is only added to the working set if it's for a project that
doesn't already have a distribution in the set, unless `replace=True`.
If it's added, any callbacks registered with the ``subscribe()`` method
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`requirements` must be a sequence of ``Requirement`` objects. `env`,
if supplied, should be an ``Environment`` instance. If
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entry or distribution in the working set. `installer`, if supplied,
will be invoked with each requirement that cannot be met by an
already-installed distribution; it should return a ``Distribution`` or
``None``.
Unless `replace_conflicting=True`, raises a VersionConflict exception
if
any requirements are found on the path that have the correct name but
the wrong version. Otherwise, if an `installer` is supplied it will be
invoked to obtain the correct version of the requirement and activate
it.
`extras` is a list of the extras to be used with these requirements.
This is important because extra requirements may look like `my_req;
extra = "my_extra"`, which would otherwise be interpreted as a purely
optional requirement. Instead, we want to be able to assert that these
requirements are truly required.
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distributions, errors = working_set.find_plugins(
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map(working_set.add, distributions)
# display errors
print('Could not load', errors)
The `plugin_env` should be an ``Environment`` instance that contains
only distributions that are in the project's "plugin directory" or
directories. The `full_env`, if supplied, should be an ``Environment``
contains all currently-available distributions. If `full_env` is not
supplied, one is created automatically from the ``WorkingSet`` this
method is called on, which will typically mean that every directory on
``sys.path`` will be scanned for distributions.
`installer` is a standard installer callback as used by the
``resolve()`` method. The `fallback` flag indicates whether we should
attempt to resolve older versions of a plugin if the newest version
cannot be resolved.
This method returns a 2-tuple: (`distributions`, `error_info`), where
`distributions` is a list of the distributions found in `plugin_env`
that were loadable, along with any other distributions that are needed
to resolve their dependencies. `error_info` is a dictionary mapping
unloadable plugin distributions to an exception instance describing the
error that occurred. Usually this will be a ``DistributionNotFound`` or
``VersionConflict`` instance.
N)
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included, even if they were already activated in this working set.
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N)r r )r callbackexistingr r r r subscribe} s
zWorkingSet.subscribec C s | j D ] }|| qd S r )r )r r r r r r r s
zWorkingSet._added_newc C s, | j d d | j | j | jd d fS r )r r r+ r r r r r r r) s zWorkingSet.__getstate__c C s@ |\}}}}|d d | _ | | _| | _|d d | _d S r )r r+ r r r )r Ze_k_b_cr r r r r r r r* s
zWorkingSet.__setstate__)N)N)NTF)NNFN)NNT)T)r r r r r classmethodr r r r r rP rJ r r r r rI r r r) r* r r r r r_ s.
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Any distributions found on `search_path` are added to the environment.
`search_path` should be a sequence of ``sys.path`` items. If not
supplied, ``sys.path`` is used.
`platform` is an optional string specifying the name of the platform
that platform-specific distributions must be compatible with. If
unspecified, it defaults to the current platform. `python` is an
optional string naming the desired version of Python (e.g. ``'3.6'``);
it defaults to the current version.
You may explicitly set `platform` (and/or `python`) to ``None`` if you
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running platform or Python version.
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N)r%
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zEnvironment.can_addc C s | j |j | dS )z"Remove `dist` from the environmentN)r$ r1 remover r r r r* s zEnvironment.removec C s4 |du rt j}|D ] }t|D ]}| | q qdS )ad Scan `search_path` for distributions usable in this environment
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`search_path` should be a sequence of ``sys.path`` items. If not
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N)r@ r rZ r )r r' r r r r r r& s
zEnvironment.scanc C s | }| j|g S )a Return a newest-to-oldest list of distributions for `project_name`
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This calls the ``find(req)`` method of the `working_set` to see if a
suitable distribution is already active. (This may raise
``VersionConflict`` if an unsuitable version of the project is already
active in the specified `working_set`.) If a suitable distribution
isn't active, this method returns the newest distribution in the
environment that meets the ``Requirement`` in `req`. If no suitable
distribution is found, and `installer` is supplied, then the result of
calling the environment's ``obtain(req, installer)`` method will be
returned.
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zEnvironment.best_matchc C s |dur||S dS )a Obtain a distribution matching `requirement` (e.g. via download)
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to the `installer` argument.Nr )r Z requirementr r r r r3 s zEnvironment.obtainc c s" | j D ]}| | r
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If the default extraction path is overridden and set to an insecure
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ntZwindirNzExtraction path is writable by group/others and vulnerable to attack when used with get_resource_filename ({path}). Consider a more secure location (set with .set_extraction_path or the PYTHON_EGG_CACHE environment variable).)
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This is where Mac header rewrites should be done; other platforms don't
have anything special they should do.
Resource providers should call this method ONLY after successfully
extracting a compressed resource. They must NOT call it on resources
that are already in the filesystem.
`tempname` is the current (temporary) name of the file, and `filename`
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returns.
posixim i N)r r rO rP chmod)r ZtempnamefilenamerV r r r postprocess s
zResourceManager.postprocessc C s | j rtd|| _dS )a Set the base path where resources will be extracted to, if needed.
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path defaults to the return value of ``get_default_cache()``. (Which
is based on the ``PYTHON_EGG_CACHE`` environment variable, with various
platform-specific fallbacks. See that routine's documentation for more
details.)
Resources are extracted to subdirectories of this path based upon
information given by the ``IResourceProvider``. You may set this to a
temporary directory, but then you must call ``cleanup_resources()`` to
delete the extracted files when done. There is no guarantee that
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manager once resources have been extracted, unless you first call
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Delete all extracted resource files and directories, returning a list
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This function does not have any concurrency protection, so it should
generally only be called when the extraction path is a temporary
directory exclusive to a single process. This method is not
automatically called; you must call it explicitly or register it as an
``atexit`` function if you wish to ensure cleanup of a temporary
directory used for extractions.
Nr )r forcer r r r\ s z!ResourceManager.cleanup_resources)r )F)r r r r r> r rU rV rS rR rQ rT rF rL staticmethodrI r[ r[ r\ r r r r r` W s
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Validate text as a PEP 508 environment marker; return an exception
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Evaluate a PEP 508 environment marker.
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Raise SyntaxError if marker is invalid.
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dd Zdd Zdd Zdd Zdd Zdd Zd d Zd d Zd!d" Zd#d$ Zd%d& Zed'd( Zd)d* ZdS )+r zETry to implement resources and metadata for arbitrary PEP 302 loadersNc C s( t |dd | _tjt |dd| _d S )Nr __file__r )r r r r dirname module_pathr r r r r r a s zNullProvider.__init__c C s | | j|S r )_fnri r r r r r r r e s z"NullProvider.get_resource_filenamec C s t | ||S r )ioBytesIOr rl r r r r h s z NullProvider.get_resource_streamc C s | | | j|S r )_getrk ri rl r r r r k s z NullProvider.get_resource_stringc C s | | | j|S r )_hasrk ri r r r r r r n s zNullProvider.has_resourcec C s | | j|S r )rk egg_infor r r r r _get_metadata_pathq s z NullProvider._get_metadata_pathc C s | j s | j S | |}| |S r )rr rt rp r r r r r r r t s
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