mirror of
https://github.com/python/cpython.git
synced 2024-12-29 19:55:17 +08:00
630 lines
23 KiB
Python
630 lines
23 KiB
Python
"""PEP 376 implementation."""
|
|
|
|
import io
|
|
import os
|
|
import re
|
|
import csv
|
|
import sys
|
|
import zipimport
|
|
from hashlib import md5
|
|
from packaging import logger
|
|
from packaging.errors import PackagingError
|
|
from packaging.version import suggest_normalized_version, VersionPredicate
|
|
from packaging.metadata import Metadata
|
|
|
|
|
|
__all__ = [
|
|
'Distribution', 'EggInfoDistribution', 'distinfo_dirname',
|
|
'get_distributions', 'get_distribution', 'get_file_users',
|
|
'provides_distribution', 'obsoletes_distribution',
|
|
'enable_cache', 'disable_cache', 'clear_cache',
|
|
]
|
|
|
|
|
|
# TODO update docs
|
|
|
|
DIST_FILES = ('INSTALLER', 'METADATA', 'RECORD', 'REQUESTED', 'RESOURCES')
|
|
|
|
# Cache
|
|
_cache_name = {} # maps names to Distribution instances
|
|
_cache_name_egg = {} # maps names to EggInfoDistribution instances
|
|
_cache_path = {} # maps paths to Distribution instances
|
|
_cache_path_egg = {} # maps paths to EggInfoDistribution instances
|
|
_cache_generated = False # indicates if .dist-info distributions are cached
|
|
_cache_generated_egg = False # indicates if .dist-info and .egg are cached
|
|
_cache_enabled = True
|
|
|
|
|
|
def enable_cache():
|
|
"""
|
|
Enables the internal cache.
|
|
|
|
Note that this function will not clear the cache in any case, for that
|
|
functionality see :func:`clear_cache`.
|
|
"""
|
|
global _cache_enabled
|
|
|
|
_cache_enabled = True
|
|
|
|
|
|
def disable_cache():
|
|
"""
|
|
Disables the internal cache.
|
|
|
|
Note that this function will not clear the cache in any case, for that
|
|
functionality see :func:`clear_cache`.
|
|
"""
|
|
global _cache_enabled
|
|
|
|
_cache_enabled = False
|
|
|
|
|
|
def clear_cache():
|
|
""" Clears the internal cache. """
|
|
global _cache_name, _cache_name_egg, _cache_path, _cache_path_egg, \
|
|
_cache_generated, _cache_generated_egg
|
|
|
|
_cache_name = {}
|
|
_cache_name_egg = {}
|
|
_cache_path = {}
|
|
_cache_path_egg = {}
|
|
_cache_generated = False
|
|
_cache_generated_egg = False
|
|
|
|
|
|
def _yield_distributions(include_dist, include_egg, paths=sys.path):
|
|
"""
|
|
Yield .dist-info and .egg(-info) distributions, based on the arguments
|
|
|
|
:parameter include_dist: yield .dist-info distributions
|
|
:parameter include_egg: yield .egg(-info) distributions
|
|
"""
|
|
for path in paths:
|
|
realpath = os.path.realpath(path)
|
|
if not os.path.isdir(realpath):
|
|
continue
|
|
for dir in os.listdir(realpath):
|
|
dist_path = os.path.join(realpath, dir)
|
|
if include_dist and dir.endswith('.dist-info'):
|
|
yield Distribution(dist_path)
|
|
elif include_egg and (dir.endswith('.egg-info') or
|
|
dir.endswith('.egg')):
|
|
yield EggInfoDistribution(dist_path)
|
|
|
|
|
|
def _generate_cache(use_egg_info=False, paths=sys.path):
|
|
global _cache_generated, _cache_generated_egg
|
|
|
|
if _cache_generated_egg or (_cache_generated and not use_egg_info):
|
|
return
|
|
else:
|
|
gen_dist = not _cache_generated
|
|
gen_egg = use_egg_info
|
|
|
|
for dist in _yield_distributions(gen_dist, gen_egg, paths):
|
|
if isinstance(dist, Distribution):
|
|
_cache_path[dist.path] = dist
|
|
if not dist.name in _cache_name:
|
|
_cache_name[dist.name] = []
|
|
_cache_name[dist.name].append(dist)
|
|
else:
|
|
_cache_path_egg[dist.path] = dist
|
|
if not dist.name in _cache_name_egg:
|
|
_cache_name_egg[dist.name] = []
|
|
_cache_name_egg[dist.name].append(dist)
|
|
|
|
if gen_dist:
|
|
_cache_generated = True
|
|
if gen_egg:
|
|
_cache_generated_egg = True
|
|
|
|
|
|
class Distribution:
|
|
"""Created with the *path* of the ``.dist-info`` directory provided to the
|
|
constructor. It reads the metadata contained in ``METADATA`` when it is
|
|
instantiated."""
|
|
|
|
name = ''
|
|
"""The name of the distribution."""
|
|
|
|
version = ''
|
|
"""The version of the distribution."""
|
|
|
|
metadata = None
|
|
"""A :class:`packaging.metadata.Metadata` instance loaded with
|
|
the distribution's ``METADATA`` file."""
|
|
|
|
requested = False
|
|
"""A boolean that indicates whether the ``REQUESTED`` metadata file is
|
|
present (in other words, whether the package was installed by user
|
|
request or it was installed as a dependency)."""
|
|
|
|
def __init__(self, path):
|
|
if _cache_enabled and path in _cache_path:
|
|
self.metadata = _cache_path[path].metadata
|
|
else:
|
|
metadata_path = os.path.join(path, 'METADATA')
|
|
self.metadata = Metadata(path=metadata_path)
|
|
|
|
self.name = self.metadata['Name']
|
|
self.version = self.metadata['Version']
|
|
self.path = path
|
|
|
|
if _cache_enabled and not path in _cache_path:
|
|
_cache_path[path] = self
|
|
|
|
def __repr__(self):
|
|
return '<Distribution %r %s at %r>' % (
|
|
self.name, self.version, self.path)
|
|
|
|
def _get_records(self, local=False):
|
|
with self.get_distinfo_file('RECORD') as record:
|
|
record_reader = csv.reader(record, delimiter=',',
|
|
lineterminator='\n')
|
|
# XXX needs an explaining comment
|
|
for row in record_reader:
|
|
path, checksum, size = (row[:] +
|
|
[None for i in range(len(row), 3)])
|
|
if local:
|
|
path = path.replace('/', os.sep)
|
|
path = os.path.join(sys.prefix, path)
|
|
yield path, checksum, size
|
|
|
|
def get_resource_path(self, relative_path):
|
|
with self.get_distinfo_file('RESOURCES') as resources_file:
|
|
resources_reader = csv.reader(resources_file, delimiter=',',
|
|
lineterminator='\n')
|
|
for relative, destination in resources_reader:
|
|
if relative == relative_path:
|
|
return destination
|
|
raise KeyError(
|
|
'no resource file with relative path %r is installed' %
|
|
relative_path)
|
|
|
|
def list_installed_files(self, local=False):
|
|
"""
|
|
Iterates over the ``RECORD`` entries and returns a tuple
|
|
``(path, md5, size)`` for each line. If *local* is ``True``,
|
|
the returned path is transformed into a local absolute path.
|
|
Otherwise the raw value from RECORD is returned.
|
|
|
|
A local absolute path is an absolute path in which occurrences of
|
|
``'/'`` have been replaced by the system separator given by ``os.sep``.
|
|
|
|
:parameter local: flag to say if the path should be returned a local
|
|
absolute path
|
|
|
|
:type local: boolean
|
|
:returns: iterator of (path, md5, size)
|
|
"""
|
|
return self._get_records(local)
|
|
|
|
def uses(self, path):
|
|
"""
|
|
Returns ``True`` if path is listed in ``RECORD``. *path* can be a local
|
|
absolute path or a relative ``'/'``-separated path.
|
|
|
|
:rtype: boolean
|
|
"""
|
|
for p, checksum, size in self._get_records():
|
|
local_absolute = os.path.join(sys.prefix, p)
|
|
if path == p or path == local_absolute:
|
|
return True
|
|
return False
|
|
|
|
def get_distinfo_file(self, path, binary=False):
|
|
"""
|
|
Returns a file located under the ``.dist-info`` directory. Returns a
|
|
``file`` instance for the file pointed by *path*.
|
|
|
|
:parameter path: a ``'/'``-separated path relative to the
|
|
``.dist-info`` directory or an absolute path;
|
|
If *path* is an absolute path and doesn't start
|
|
with the ``.dist-info`` directory path,
|
|
a :class:`PackagingError` is raised
|
|
:type path: string
|
|
:parameter binary: If *binary* is ``True``, opens the file in read-only
|
|
binary mode (``rb``), otherwise opens it in
|
|
read-only mode (``r``).
|
|
:rtype: file object
|
|
"""
|
|
open_flags = 'r'
|
|
if binary:
|
|
open_flags += 'b'
|
|
|
|
# Check if it is an absolute path # XXX use relpath, add tests
|
|
if path.find(os.sep) >= 0:
|
|
# it's an absolute path?
|
|
distinfo_dirname, path = path.split(os.sep)[-2:]
|
|
if distinfo_dirname != self.path.split(os.sep)[-1]:
|
|
raise PackagingError(
|
|
'dist-info file %r does not belong to the %r %s '
|
|
'distribution' % (path, self.name, self.version))
|
|
|
|
# The file must be relative
|
|
if path not in DIST_FILES:
|
|
raise PackagingError('invalid path for a dist-info file: %r' %
|
|
path)
|
|
|
|
path = os.path.join(self.path, path)
|
|
return open(path, open_flags)
|
|
|
|
def list_distinfo_files(self, local=False):
|
|
"""
|
|
Iterates over the ``RECORD`` entries and returns paths for each line if
|
|
the path is pointing to a file located in the ``.dist-info`` directory
|
|
or one of its subdirectories.
|
|
|
|
:parameter local: If *local* is ``True``, each returned path is
|
|
transformed into a local absolute path. Otherwise the
|
|
raw value from ``RECORD`` is returned.
|
|
:type local: boolean
|
|
:returns: iterator of paths
|
|
"""
|
|
for path, checksum, size in self._get_records(local):
|
|
yield path
|
|
|
|
def __eq__(self, other):
|
|
return isinstance(other, Distribution) and self.path == other.path
|
|
|
|
# See http://docs.python.org/reference/datamodel#object.__hash__
|
|
__hash__ = object.__hash__
|
|
|
|
|
|
class EggInfoDistribution:
|
|
"""Created with the *path* of the ``.egg-info`` directory or file provided
|
|
to the constructor. It reads the metadata contained in the file itself, or
|
|
if the given path happens to be a directory, the metadata is read from the
|
|
file ``PKG-INFO`` under that directory."""
|
|
|
|
name = ''
|
|
"""The name of the distribution."""
|
|
|
|
version = ''
|
|
"""The version of the distribution."""
|
|
|
|
metadata = None
|
|
"""A :class:`packaging.metadata.Metadata` instance loaded with
|
|
the distribution's ``METADATA`` file."""
|
|
|
|
_REQUIREMENT = re.compile(
|
|
r'(?P<name>[-A-Za-z0-9_.]+)\s*'
|
|
r'(?P<first>(?:<|<=|!=|==|>=|>)[-A-Za-z0-9_.]+)?\s*'
|
|
r'(?P<rest>(?:\s*,\s*(?:<|<=|!=|==|>=|>)[-A-Za-z0-9_.]+)*)\s*'
|
|
r'(?P<extras>\[.*\])?')
|
|
|
|
def __init__(self, path):
|
|
self.path = path
|
|
if _cache_enabled and path in _cache_path_egg:
|
|
self.metadata = _cache_path_egg[path].metadata
|
|
self.name = self.metadata['Name']
|
|
self.version = self.metadata['Version']
|
|
return
|
|
|
|
# reused from Distribute's pkg_resources
|
|
def yield_lines(strs):
|
|
"""Yield non-empty/non-comment lines of a ``basestring``
|
|
or sequence"""
|
|
if isinstance(strs, str):
|
|
for s in strs.splitlines():
|
|
s = s.strip()
|
|
# skip blank lines/comments
|
|
if s and not s.startswith('#'):
|
|
yield s
|
|
else:
|
|
for ss in strs:
|
|
for s in yield_lines(ss):
|
|
yield s
|
|
|
|
requires = None
|
|
|
|
if path.endswith('.egg'):
|
|
if os.path.isdir(path):
|
|
meta_path = os.path.join(path, 'EGG-INFO', 'PKG-INFO')
|
|
self.metadata = Metadata(path=meta_path)
|
|
try:
|
|
req_path = os.path.join(path, 'EGG-INFO', 'requires.txt')
|
|
with open(req_path, 'r') as fp:
|
|
requires = fp.read()
|
|
except IOError:
|
|
requires = None
|
|
else:
|
|
# FIXME handle the case where zipfile is not available
|
|
zipf = zipimport.zipimporter(path)
|
|
fileobj = io.StringIO(
|
|
zipf.get_data('EGG-INFO/PKG-INFO').decode('utf8'))
|
|
self.metadata = Metadata(fileobj=fileobj)
|
|
try:
|
|
requires = zipf.get_data('EGG-INFO/requires.txt')
|
|
except IOError:
|
|
requires = None
|
|
self.name = self.metadata['Name']
|
|
self.version = self.metadata['Version']
|
|
|
|
elif path.endswith('.egg-info'):
|
|
if os.path.isdir(path):
|
|
path = os.path.join(path, 'PKG-INFO')
|
|
try:
|
|
with open(os.path.join(path, 'requires.txt'), 'r') as fp:
|
|
requires = fp.read()
|
|
except IOError:
|
|
requires = None
|
|
self.metadata = Metadata(path=path)
|
|
self.name = self.metadata['name']
|
|
self.version = self.metadata['Version']
|
|
|
|
else:
|
|
raise ValueError('path must end with .egg-info or .egg, got %r' %
|
|
path)
|
|
|
|
if requires is not None:
|
|
if self.metadata['Metadata-Version'] == '1.1':
|
|
# we can't have 1.1 metadata *and* Setuptools requires
|
|
for field in ('Obsoletes', 'Requires', 'Provides'):
|
|
del self.metadata[field]
|
|
|
|
reqs = []
|
|
|
|
if requires is not None:
|
|
for line in yield_lines(requires):
|
|
if line.startswith('['):
|
|
logger.warning(
|
|
'extensions in requires.txt are not supported '
|
|
'(used by %r %s)', self.name, self.version)
|
|
break
|
|
else:
|
|
match = self._REQUIREMENT.match(line.strip())
|
|
if not match:
|
|
# this happens when we encounter extras; since they
|
|
# are written at the end of the file we just exit
|
|
break
|
|
else:
|
|
if match.group('extras'):
|
|
msg = ('extra requirements are not supported '
|
|
'(used by %r %s)', self.name, self.version)
|
|
logger.warning(msg, self.name)
|
|
name = match.group('name')
|
|
version = None
|
|
if match.group('first'):
|
|
version = match.group('first')
|
|
if match.group('rest'):
|
|
version += match.group('rest')
|
|
version = version.replace(' ', '') # trim spaces
|
|
if version is None:
|
|
reqs.append(name)
|
|
else:
|
|
reqs.append('%s (%s)' % (name, version))
|
|
|
|
if len(reqs) > 0:
|
|
self.metadata['Requires-Dist'] += reqs
|
|
|
|
if _cache_enabled:
|
|
_cache_path_egg[self.path] = self
|
|
|
|
def __repr__(self):
|
|
return '<EggInfoDistribution %r %s at %r>' % (
|
|
self.name, self.version, self.path)
|
|
|
|
def list_installed_files(self, local=False):
|
|
|
|
def _md5(path):
|
|
with open(path, 'rb') as f:
|
|
content = f.read()
|
|
return md5(content).hexdigest()
|
|
|
|
def _size(path):
|
|
return os.stat(path).st_size
|
|
|
|
path = self.path
|
|
if local:
|
|
path = path.replace('/', os.sep)
|
|
|
|
# XXX What about scripts and data files ?
|
|
if os.path.isfile(path):
|
|
return [(path, _md5(path), _size(path))]
|
|
else:
|
|
files = []
|
|
for root, dir, files_ in os.walk(path):
|
|
for item in files_:
|
|
item = os.path.join(root, item)
|
|
files.append((item, _md5(item), _size(item)))
|
|
return files
|
|
|
|
return []
|
|
|
|
def uses(self, path):
|
|
return False
|
|
|
|
def __eq__(self, other):
|
|
return (isinstance(other, EggInfoDistribution) and
|
|
self.path == other.path)
|
|
|
|
# See http://docs.python.org/reference/datamodel#object.__hash__
|
|
__hash__ = object.__hash__
|
|
|
|
|
|
def distinfo_dirname(name, version):
|
|
"""
|
|
The *name* and *version* parameters are converted into their
|
|
filename-escaped form, i.e. any ``'-'`` characters are replaced
|
|
with ``'_'`` other than the one in ``'dist-info'`` and the one
|
|
separating the name from the version number.
|
|
|
|
:parameter name: is converted to a standard distribution name by replacing
|
|
any runs of non- alphanumeric characters with a single
|
|
``'-'``.
|
|
:type name: string
|
|
:parameter version: is converted to a standard version string. Spaces
|
|
become dots, and all other non-alphanumeric characters
|
|
(except dots) become dashes, with runs of multiple
|
|
dashes condensed to a single dash.
|
|
:type version: string
|
|
:returns: directory name
|
|
:rtype: string"""
|
|
file_extension = '.dist-info'
|
|
name = name.replace('-', '_')
|
|
normalized_version = suggest_normalized_version(version)
|
|
# Because this is a lookup procedure, something will be returned even if
|
|
# it is a version that cannot be normalized
|
|
if normalized_version is None:
|
|
# Unable to achieve normality?
|
|
normalized_version = version
|
|
return '-'.join([name, normalized_version]) + file_extension
|
|
|
|
|
|
def get_distributions(use_egg_info=False, paths=sys.path):
|
|
"""
|
|
Provides an iterator that looks for ``.dist-info`` directories in
|
|
``sys.path`` and returns :class:`Distribution` instances for each one of
|
|
them. If the parameters *use_egg_info* is ``True``, then the ``.egg-info``
|
|
files and directores are iterated as well.
|
|
|
|
:rtype: iterator of :class:`Distribution` and :class:`EggInfoDistribution`
|
|
instances
|
|
"""
|
|
if not _cache_enabled:
|
|
for dist in _yield_distributions(True, use_egg_info, paths):
|
|
yield dist
|
|
else:
|
|
_generate_cache(use_egg_info, paths)
|
|
|
|
for dist in _cache_path.values():
|
|
yield dist
|
|
|
|
if use_egg_info:
|
|
for dist in _cache_path_egg.values():
|
|
yield dist
|
|
|
|
|
|
def get_distribution(name, use_egg_info=False, paths=None):
|
|
"""
|
|
Scans all elements in ``sys.path`` and looks for all directories
|
|
ending with ``.dist-info``. Returns a :class:`Distribution`
|
|
corresponding to the ``.dist-info`` directory that contains the
|
|
``METADATA`` that matches *name* for the *name* metadata field.
|
|
If no distribution exists with the given *name* and the parameter
|
|
*use_egg_info* is set to ``True``, then all files and directories ending
|
|
with ``.egg-info`` are scanned. A :class:`EggInfoDistribution` instance is
|
|
returned if one is found that has metadata that matches *name* for the
|
|
*name* metadata field.
|
|
|
|
This function only returns the first result found, as no more than one
|
|
value is expected. If the directory is not found, ``None`` is returned.
|
|
|
|
:rtype: :class:`Distribution` or :class:`EggInfoDistribution` or None
|
|
"""
|
|
if paths == None:
|
|
paths = sys.path
|
|
|
|
if not _cache_enabled:
|
|
for dist in _yield_distributions(True, use_egg_info, paths):
|
|
if dist.name == name:
|
|
return dist
|
|
else:
|
|
_generate_cache(use_egg_info, paths)
|
|
|
|
if name in _cache_name:
|
|
return _cache_name[name][0]
|
|
elif use_egg_info and name in _cache_name_egg:
|
|
return _cache_name_egg[name][0]
|
|
else:
|
|
return None
|
|
|
|
|
|
def obsoletes_distribution(name, version=None, use_egg_info=False):
|
|
"""
|
|
Iterates over all distributions to find which distributions obsolete
|
|
*name*.
|
|
|
|
If a *version* is provided, it will be used to filter the results.
|
|
If the argument *use_egg_info* is set to ``True``, then ``.egg-info``
|
|
distributions will be considered as well.
|
|
|
|
:type name: string
|
|
:type version: string
|
|
:parameter name:
|
|
"""
|
|
for dist in get_distributions(use_egg_info):
|
|
obsoleted = (dist.metadata['Obsoletes-Dist'] +
|
|
dist.metadata['Obsoletes'])
|
|
for obs in obsoleted:
|
|
o_components = obs.split(' ', 1)
|
|
if len(o_components) == 1 or version is None:
|
|
if name == o_components[0]:
|
|
yield dist
|
|
break
|
|
else:
|
|
try:
|
|
predicate = VersionPredicate(obs)
|
|
except ValueError:
|
|
raise PackagingError(
|
|
'distribution %r has ill-formed obsoletes field: '
|
|
'%r' % (dist.name, obs))
|
|
if name == o_components[0] and predicate.match(version):
|
|
yield dist
|
|
break
|
|
|
|
|
|
def provides_distribution(name, version=None, use_egg_info=False):
|
|
"""
|
|
Iterates over all distributions to find which distributions provide *name*.
|
|
If a *version* is provided, it will be used to filter the results. Scans
|
|
all elements in ``sys.path`` and looks for all directories ending with
|
|
``.dist-info``. Returns a :class:`Distribution` corresponding to the
|
|
``.dist-info`` directory that contains a ``METADATA`` that matches *name*
|
|
for the name metadata. If the argument *use_egg_info* is set to ``True``,
|
|
then all files and directories ending with ``.egg-info`` are considered
|
|
as well and returns an :class:`EggInfoDistribution` instance.
|
|
|
|
This function only returns the first result found, since no more than
|
|
one values are expected. If the directory is not found, returns ``None``.
|
|
|
|
:parameter version: a version specifier that indicates the version
|
|
required, conforming to the format in ``PEP-345``
|
|
|
|
:type name: string
|
|
:type version: string
|
|
"""
|
|
predicate = None
|
|
if not version is None:
|
|
try:
|
|
predicate = VersionPredicate(name + ' (' + version + ')')
|
|
except ValueError:
|
|
raise PackagingError('invalid name or version: %r, %r' %
|
|
(name, version))
|
|
|
|
for dist in get_distributions(use_egg_info):
|
|
provided = dist.metadata['Provides-Dist'] + dist.metadata['Provides']
|
|
|
|
for p in provided:
|
|
p_components = p.rsplit(' ', 1)
|
|
if len(p_components) == 1 or predicate is None:
|
|
if name == p_components[0]:
|
|
yield dist
|
|
break
|
|
else:
|
|
p_name, p_ver = p_components
|
|
if len(p_ver) < 2 or p_ver[0] != '(' or p_ver[-1] != ')':
|
|
raise PackagingError(
|
|
'distribution %r has invalid Provides field: %r' %
|
|
(dist.name, p))
|
|
p_ver = p_ver[1:-1] # trim off the parenthesis
|
|
if p_name == name and predicate.match(p_ver):
|
|
yield dist
|
|
break
|
|
|
|
|
|
def get_file_users(path):
|
|
"""
|
|
Iterates over all distributions to find out which distributions use
|
|
*path*.
|
|
|
|
:parameter path: can be a local absolute path or a relative
|
|
``'/'``-separated path.
|
|
:type path: string
|
|
:rtype: iterator of :class:`Distribution` instances
|
|
"""
|
|
for dist in get_distributions():
|
|
if dist.uses(path):
|
|
yield dist
|