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Package resource API
--------------------
A resource is a logical file contained within a package, or a logical
subdirectory thereof. The package resource API expects resource names
to have their path parts separated with ``/``, *not* whatever the local
path separator is. Do not use os.path operations to manipulate resource
names being passed into the API.
The package resource API is designed to work with normal filesystem packages,
.egg files, and unpacked .egg files. It can also work in a limited way with
.zip files and with custom PEP 302 loaders that support the ``get_data()``
method.
)absolute_importN) get_importer)six)urllibmapfilter)utime)mkdirrenameunlinkTF)open)isdirsplit )
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Used when there is an issue with a version or specifier not complying with
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WorkingSetResourceManager Distribution Requirement
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An already-installed version conflicts with the requested version.
Should be initialized with the installed Distribution and the requested
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r r r r r/ r1 r3 r6 rn rl r r r r r
s| ==5 5 5
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Z d Z
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4 // D FF4LLLL X $ $EBJ&& U### j r c | j |g | j | t |d D ]}| ||d dS )a Add a path item to ``.entries``, finding any distributions on it
``find_distributions(entry, True)`` is used to find distributions
corresponding to the path entry, and they are added. `entry` is
always appended to ``.entries``, even if it is already present.
(This is because ``sys.path`` can contain the same value more than
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equal ``sys.path``.)
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If there is an active distribution for the requested project, this
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`req`. But, if there is an active distribution for the project and it
does *not* meet the `req` requirement, ``VersionConflict`` is raised.
If there is no active distribution for the requested project, ``None``
is returned.
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If `name` is None, yields all entry points in `group` from all
distributions in the working set, otherwise only ones matching
both `group` and `name` are yielded (in distribution order).
c 3 K | ]=}| D ]} |j k |V >d S r! )rf valuesr ).0r r@ r\ r s r z/WorkingSet.iter_entry_points.. sq
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+
+d?? !DI +c****
+ + +r TFc |r | | j || ||j }| j |g }| j |j g }|s|j | j v rdS || j |j < |j |vr| |j |j |vr| |j | | dS )a Add `dist` to working set, associated with `entry`
If `entry` is unspecified, it defaults to the ``.location`` of `dist`.
On exit from this routine, `entry` is added to the end of the working
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
will be called.
r N) insert_onr; locationr< rQ rD r= r
_added_new)r r r@ insertr keyskeys2s r rL zWorkingSet.add s A NN4<N @ @ @ =ME))%44**4="== 48t{22 F $ DH 84 KK ! ! ! 85 LL " " " r c t | ddd }i }i }g }t } t j t }
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| | j | j | |< -d|| < ||S )a List all distributions needed to (recursively) meet `requirements`
`requirements` must be a sequence of ``Requirement`` objects. `env`,
if supplied, should be an ``Environment`` instance. If
not supplied, it defaults to all distributions available within any
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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n$# t $ r}||| < |rY d}~Y d}~ nd}~ww xY wt | }| ||fS )as Find all activatable distributions in `plugin_env`
Example usage::
distributions, errors = working_set.find_plugins(
Environment(plugin_dirlist)
)
# add plugins+libs to sys.path
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.
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thereof, specifying the distributions and versions required. The
return value is a sequence of the distributions that needed to be
activated to fulfill the requirements; all relevant distributions are
included, even if they were already activated in this working set.
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> > >+ + +" < 9=26Z Z Z Zz GKR) R) R) R)h
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Map each requirement to the extras that demanded it.
Nc fd| d |pdz D }j pt | S )z
Evaluate markers for req against each extra that
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Return False if the req has a marker and fails
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Zd ZdS )rv z5Searchable snapshot of distributions on a search pathNc Z i | _ || _ || _ | | dS )a! Snapshot distributions available on a search path
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`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
wish to map *all* distributions, not just those compatible with the
running platform or Python version.
N)_distmaprY pythonscan)r search_pathrY r s r rA zEnvironment.__init__ s1 &
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N)rX r rr rL )r r r` r s r r zEnvironment.scan sW (K D*400
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lowercase as their key.
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LLLLL M M M M r Fc | | }n# t $ r |s d}Y nw xY w||S | |j D ]
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suitable distribution is already active. (This may raise
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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.
N)r r} rD obtain)r r rp ry rk r s r rs zEnvironment.best_match s ##C((DD &
DDD KM Ds{{ {{3 ***s **c | || S dS )a Obtain a distribution matching `requirement` (e.g. via download)
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None is returned instead. This method is a hook that allows subclasses
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to the `installer` argument.Nr )r requirementry s r r zEnvironment.obtain+ s" 9[)) ) ! r c # Z K | j D ]}| | r|V dS )z=Yield the unique project names of the available distributionsN)r rh r rD s r ra zEnvironment.__iter__7 sC =%%'' CCy
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The following attributes are available from instances of this exception:
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The resource manager that raised this exception
cache_path
The base directory for resource extraction
original_error
The exception instance that caused extraction to fail
Nr r r r r r U s r r c x e Zd ZdZdZd Zd Zd Zd Zd Z d Z
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r c H t | | | S )z%Return specified resource as a string)rc r3 r s r ri z ResourceManager.resource_string r r c F t | | S )z1List the contents of the named resource directory)rc rl r s r rl z ResourceManager.resource_listdir s& 233DD
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Can't extract file(s) to egg cache
The following error occurred while trying to extract file(s)
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{old_exc}
The Python egg cache directory is currently set to:
{cache_path}
Perhaps your account does not have write access to this directory?
You can change the cache directory by setting the PYTHON_EGG_CACHE
environment variable to point to an accessible directory.
Nr )
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kdk 5 5FHH 5 566 # $ r r c | j p
t }t j j ||dz g|R } t | n$# t $ r | Y nw xY w| | d| j |< |S )a Return absolute location in cache for `archive_name` and `names`
The parent directory of the resulting path will be created if it does
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enclosing egg (which may not be the name of the enclosing zipfile!),
including its ".egg" extension. `names`, if provided, should be a
sequence of path name parts "under" the egg's extraction location.
This method should only be called by resource providers that need to
obtain an extraction location, and only for names they intend to
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If the default extraction path is overridden and set to an insecure
location, such as /tmp, it opens up an opportunity for an attacker to
replace an extracted file with an unauthorized payload. Warn the user
if a known insecure location is used.
See Distribute #375 for more details.
ntwindirNz%s is writable by group/others and vulnerable to attack when used with get_resource_filename. Consider a more secure location (set with .set_extraction_path or the PYTHON_EGG_CACHE environment variable).) r r r environstatst_modeS_IWOTHS_IWGRPwarningswarn UserWarning)r modemsgs r r z,ResourceManager._warn_unsafe_extraction_path s 7d??4??2:h3G#H#H?
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M#{ + + + + + , ,r c t j dk r6t j | j dz dz }t j || dS dS )a4 Perform any platform-specific postprocessing of `tempname`
This is where Mac header rewrites should be done; other platforms don't
have anything special they should do.
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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`
is the name it will be renamed to by the caller after this routine
returns.
posixim i N)r r r r chmod)r tempnamefilenamer s r postprocesszResourceManager.postprocess sM 7g WX&&.%76AD HXt $ $ $ $ $ r c @ | j rt d || _ 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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generally only be called when the extraction path is a temporary
directory exclusive to a single process. This method is not
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``atexit`` function if you wish to ensure cleanup of a temporary
directory used for extractions.
Nr )r forces r rt z!ResourceManager.cleanup_resources r r r F)r r r r r rA rm rn rk rj ri rl r r staticmethodr r rs rt r r r rx rx e s 11O P P P
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Convert an arbitrary string to a standard version string
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)r" s r r r - su 69$,,W55666 + 6 6 6//#s++v&W555556s +. A A10A1c R t j dd| S )zConvert an arbitrary string to a standard 'extra' name
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rT r rc r s r r r B 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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t,,,r c r | j s| j S | | }| | S r! )r- r/ r* r r r s r r zNullProvider.has_metadata s7 } != &&t,,yy r c | j sdS | | }| | }t j r|S | d S # t $ r*}|xj d || z
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