Viewing file:  database.py (48.51 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
# -*- coding: utf-8 -*-
#
# Copyright (C) 2012-2016 The Python Software Foundation.
# See LICENSE.txt and CONTRIBUTORS.txt.
#
"""PEP 376 implementation."""
from __future__ import unicode_literals
import base64
import codecs
import contextlib
import hashlib
import logging
import os
import posixpath
import sys
import zipimport
from . import DistlibException, resources
from .compat import StringIO
from .version import get_scheme, UnsupportedVersionError
from .metadata import Metadata, METADATA_FILENAME, WHEEL_METADATA_FILENAME
from .util import (parse_requirement, cached_property, parse_name_and_version,
read_exports, write_exports, CSVReader, CSVWriter)
__all__ = ['Distribution', 'BaseInstalledDistribution',
'InstalledDistribution', 'EggInfoDistribution',
'DistributionPath']
logger = logging.getLogger(__name__)
EXPORTS_FILENAME = 'pydist-exports.json'
COMMANDS_FILENAME = 'pydist-commands.json'
DIST_FILES = ('INSTALLER', METADATA_FILENAME, 'RECORD', 'REQUESTED',
'RESOURCES', EXPORTS_FILENAME, 'SHARED')
DISTINFO_EXT = '.dist-info'
class _Cache(object):
"""
A simple cache mapping names and .dist-info paths to distributions
"""
def __init__(self):
"""
Initialise an instance. There is normally one for each DistributionPath.
"""
self.name = {}
self.path = {}
self.generated = False
def clear(self):
"""
Clear the cache, setting it to its initial state.
"""
self.name.clear()
self.path.clear()
self.generated = False
def add(self, dist):
"""
Add a distribution to the cache.
:param dist: The distribution to add.
"""
if dist.path not in self.path:
self.path[dist.path] = dist
self.name.setdefault(dist.key, []).append(dist)
class DistributionPath(object):
"""
Represents a set of distributions installed on a path (typically sys.path).
"""
def __init__(self, path=None, include_egg=False):
"""
Create an instance from a path, optionally including legacy (distutils/
setuptools/distribute) distributions.
:param path: The path to use, as a list of directories. If not specified,
sys.path is used.
:param include_egg: If True, this instance will look for and return legacy
distributions as well as those based on PEP 376.
"""
if path is None:
path = sys.path
self.path = path
self._include_dist = True
self._include_egg = include_egg
self._cache = _Cache()
self._cache_egg = _Cache()
self._cache_enabled = True
self._scheme = get_scheme('default')
def _get_cache_enabled(self):
return self._cache_enabled
def _set_cache_enabled(self, value):
self._cache_enabled = value
cache_enabled = property(_get_cache_enabled, _set_cache_enabled)
def clear_cache(self):
"""
Clears the internal cache.
"""
self._cache.clear()
self._cache_egg.clear()
def _yield_distributions(self):
"""
Yield .dist-info and/or .egg(-info) distributions.
"""
# We need to check if we've seen some resources already, because on
# some Linux systems (e.g. some Debian/Ubuntu variants) there are
# symlinks which alias other files in the environment.
seen = set()
for path in self.path:
finder = resources.finder_for_path(path)
if finder is None:
continue
r = finder.find('')
if not r or not r.is_container:
continue
rset = sorted(r.resources)
for entry in rset:
r = finder.find(entry)
if not r or r.path in seen:
continue
if self._include_dist and entry.endswith(DISTINFO_EXT):
possible_filenames = [METADATA_FILENAME, WHEEL_METADATA_FILENAME]
for metadata_filename in possible_filenames:
metadata_path = posixpath.join(entry, metadata_filename)
pydist = finder.find(metadata_path)
if pydist:
break
else:
continue
with contextlib.closing(pydist.as_stream()) as stream:
metadata = Metadata(fileobj=stream, scheme='legacy')
logger.debug('Found %s', r.path)
seen.add(r.path)
yield new_dist_class(r.path, metadata=metadata,
env=self)
elif self._include_egg and entry.endswith(('.egg-info',
'.egg')):
logger.debug('Found %s', r.path)
seen.add(r.path)
yield old_dist_class(r.path, self)
def _generate_cache(self):
"""
Scan the path for distributions and populate the cache with
those that are found.
"""
gen_dist = not self._cache.generated
gen_egg = self._include_egg and not self._cache_egg.generated
if gen_dist or gen_egg:
for dist in self._yield_distributions():
if isinstance(dist, InstalledDistribution):
self._cache.add(dist)
else:
self._cache_egg.add(dist)
if gen_dist:
self._cache.generated = True
if gen_egg:
self._cache_egg.generated = True
@classmethod
def distinfo_dirname(cls, 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"""
name = name.replace('-', '_')
return '-'.join([name, version]) + DISTINFO_EXT
def get_distributions(self):
"""
Provides an iterator that looks for distributions and returns
:class:`InstalledDistribution` or
:class:`EggInfoDistribution` instances for each one of them.
:rtype: iterator of :class:`InstalledDistribution` and
:class:`EggInfoDistribution` instances
"""
if not self._cache_enabled:
for dist in self._yield_distributions():
yield dist
else:
self._generate_cache()
for dist in self._cache.path.values():
yield dist
if self._include_egg:
for dist in self._cache_egg.path.values():
yield dist
def get_distribution(self, name):
"""
Looks for a named distribution on the path.
This function only returns the first result found, as no more than one
value is expected. If nothing is found, ``None`` is returned.
:rtype: :class:`InstalledDistribution`, :class:`EggInfoDistribution`
or ``None``
"""
result = None
name = name.lower()
if not self._cache_enabled:
for dist in self._yield_distributions():
if dist.key == name:
result = dist
break
else:
self._generate_cache()
if name in self._cache.name:
result = self._cache.name[name][0]
elif self._include_egg and name in self._cache_egg.name:
result = self._cache_egg.name[name][0]
return result
def provides_distribution(self, name, version=None):
"""
Iterates over all distributions to find which distributions provide *name*.
If a *version* is provided, it will be used to filter the results.
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
"""
matcher = None
if not version is None:
try:
matcher = self._scheme.matcher('%s (%s)' % (name, version))
except ValueError:
raise DistlibException('invalid name or version: %r, %r' %
(name, version))
for dist in self.get_distributions():
provided = dist.provides
for p in provided:
p_name, p_ver = parse_name_and_version(p)
if matcher is None:
if p_name == name:
yield dist
break
else:
if p_name == name and matcher.match(p_ver):
yield dist
break
def get_file_path(self, name, relative_path):
"""
Return the path to a resource file.
"""
dist = self.get_distribution(name)
if dist is None:
raise LookupError('no distribution named %r found' % name)
return dist.get_resource_path(relative_path)
def get_exported_entries(self, category, name=None):
"""
Return all of the exported entries in a particular category.
:param category: The category to search for entries.
:param name: If specified, only entries with that name are returned.
"""
for dist in self.get_distributions():
r = dist.exports
if category in r:
d = r[category]
if name is not None:
if name in d:
yield d[name]
else:
for v in d.values():
yield v
class Distribution(object):
"""
A base class for distributions, whether installed or from indexes.
Either way, it must have some metadata, so that's all that's needed
for construction.
"""
build_time_dependency = False
"""
Set to True if it's known to be only a build-time dependency (i.e.
not needed after installation).
"""
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, metadata):
"""
Initialise an instance.
:param metadata: The instance of :class:`Metadata` describing this
distribution.
"""
self.metadata = metadata
self.name = metadata.name
self.key = self.name.lower() # for case-insensitive comparisons
self.version = metadata.version
self.locator = None
self.digest = None
self.extras = None # additional features requested
self.context = None # environment marker overrides
self.download_urls = set()
self.digests = {}
@property
def source_url(self):
"""
The source archive download URL for this distribution.
"""
return self.metadata.source_url
download_url = source_url # Backward compatibility
@property
def name_and_version(self):
"""
A utility property which displays the name and version in parentheses.
"""
return '%s (%s)' % (self.name, self.version)
@property
def provides(self):
"""
A set of distribution names and versions provided by this distribution.
:return: A set of "name (version)" strings.
"""
plist = self.metadata.provides
s = '%s (%s)' % (self.name, self.version)
if s not in plist:
plist.append(s)
return plist
def _get_requirements(self, req_attr):
md = self.metadata
logger.debug('Getting requirements from metadata %r', md.todict())
reqts = getattr(md, req_attr)
return set(md.get_requirements(reqts, extras=self.extras,
env=self.context))
@property
def run_requires(self):
return self._get_requirements('run_requires')
@property
def meta_requires(self):
return self._get_requirements('meta_requires')
@property
def build_requires(self):
return self._get_requirements('build_requires')
@property
def test_requires(self):
return self._get_requirements('test_requires')
@property
def dev_requires(self):
return self._get_requirements('dev_requires')
def matches_requirement(self, req):
"""
Say if this instance matches (fulfills) a requirement.
:param req: The requirement to match.
:rtype req: str
:return: True if it matches, else False.
"""
# Requirement may contain extras - parse to lose those
# from what's passed to the matcher
r = parse_requirement(req)
scheme = get_scheme(self.metadata.scheme)
try:
matcher = scheme.matcher(r.requirement)
except UnsupportedVersionError:
# XXX compat-mode if cannot read the version
logger.warning('could not read version %r - using name only',
req)
name = req.split()[0]
matcher = scheme.matcher(name)
name = matcher.key # case-insensitive
result = False
for p in self.provides:
p_name, p_ver = parse_name_and_version(p)
if p_name != name:
continue
try:
result = matcher.match(p_ver)
break
except UnsupportedVersionError:
pass
return result
def __repr__(self):
"""
Return a textual representation of this instance,
"""
if self.source_url:
suffix = ' [%s]' % self.source_url
else:
suffix = ''
return '<Distribution %s (%s)%s>' % (self.name, self.version, suffix)
def __eq__(self, other):
"""
See if this distribution is the same as another.
:param other: The distribution to compare with. To be equal to one
another. distributions must have the same type, name,
version and source_url.
:return: True if it is the same, else False.
"""
if type(other) is not type(self):
result = False
else:
result = (self.name == other.name and
self.version == other.version and
self.source_url == other.source_url)
return result
def __hash__(self):
"""
Compute hash in a way which matches the equality test.
"""
return hash(self.name) + hash(self.version) + hash(self.source_url)
class BaseInstalledDistribution(Distribution):
"""
This is the base class for installed distributions (whether PEP 376 or
legacy).
"""
hasher = None
def __init__(self, metadata, path, env=None):
"""
Initialise an instance.
:param metadata: An instance of :class:`Metadata` which describes the
distribution. This will normally have been initialised
from a metadata file in the ``path``.
:param path: The path of the ``.dist-info`` or ``.egg-info``
directory for the distribution.
:param env: This is normally the :class:`DistributionPath`
instance where this distribution was found.
"""
super(BaseInstalledDistribution, self).__init__(metadata)
self.path = path
self.dist_path = env
def get_hash(self, data, hasher=None):
"""
Get the hash of some data, using a particular hash algorithm, if
specified.
:param data: The data to be hashed.
:type data: bytes
:param hasher: The name of a hash implementation, supported by hashlib,
or ``None``. Examples of valid values are ``'sha1'``,
``'sha224'``, ``'sha384'``, '``sha256'``, ``'md5'`` and
``'sha512'``. If no hasher is specified, the ``hasher``
attribute of the :class:`InstalledDistribution` instance
is used. If the hasher is determined to be ``None``, MD5
is used as the hashing algorithm.
:returns: The hash of the data. If a hasher was explicitly specified,
the returned hash will be prefixed with the specified hasher
followed by '='.
:rtype: str
"""
if hasher is None:
hasher = self.hasher
if hasher is None:
hasher = hashlib.md5
prefix = ''
else:
hasher = getattr(hashlib, hasher)
prefix = '%s=' % self.hasher
digest = hasher(data).digest()
digest = base64.urlsafe_b64encode(digest).rstrip(b'=').decode('ascii')
return '%s%s' % (prefix, digest)
class InstalledDistribution(BaseInstalledDistribution):
"""
Created with the *path* of the ``.dist-info`` directory provided to the
constructor. It reads the metadata contained in ``pydist.json`` when it is
instantiated., or uses a passed in Metadata instance (useful for when
dry-run mode is being used).
"""
hasher = 'sha256'
def __init__(self, path, metadata=None, env=None):
self.finder = finder = resources.finder_for_path(path)
if finder is None:
import pdb; pdb.set_trace ()
if env and env._cache_enabled and path in env._cache.path:
metadata = env._cache.path[path].metadata
elif metadata is None:
r = finder.find(METADATA_FILENAME)
# Temporary - for Wheel 0.23 support
if r is None:
r = finder.find(WHEEL_METADATA_FILENAME)
# Temporary - for legacy support
if r is None:
r = finder.find('METADATA')
if r is None:
raise ValueError('no %s found in %s' % (METADATA_FILENAME,
path))
with contextlib.closing(r.as_stream()) as stream:
metadata = Metadata(fileobj=stream, scheme='legacy')
super(InstalledDistribution, self).__init__(metadata, path, env)
if env and env._cache_enabled:
env._cache.add(self)
try:
r = finder.find('REQUESTED')
except AttributeError:
import pdb; pdb.set_trace ()
self.requested = r is not None
def __repr__(self):
return '<InstalledDistribution %r %s at %r>' % (
self.name, self.version, self.path)
def __str__(self):
return "%s %s" % (self.name, self.version)
def _get_records(self):
"""
Get the list of installed files for the distribution
:return: A list of tuples of path, hash and size. Note that hash and
size might be ``None`` for some entries. The path is exactly
as stored in the file (which is as in PEP 376).
"""
results = []
r = self.get_distinfo_resource('RECORD')
with contextlib.closing(r.as_stream()) as stream:
with CSVReader(stream=stream) as record_reader:
# Base location is parent dir of .dist-info dir
#base_location = os.path.dirname(self.path)
#base_location = os.path.abspath(base_location)
for row in record_reader:
missing = [None for i in range(len(row), 3)]
path, checksum, size = row + missing
#if not os.path.isabs(path):
# path = path.replace('/', os.sep)
# path = os.path.join(base_location, path)
results.append((path, checksum, size))
return results
@cached_property
def exports(self):
"""
Return the information exported by this distribution.
:return: A dictionary of exports, mapping an export category to a dict
of :class:`ExportEntry` instances describing the individual
export entries, and keyed by name.
"""
result = {}
r = self.get_distinfo_resource(EXPORTS_FILENAME)
if r:
result = self.read_exports()
return result
def read_exports(self):
"""
Read exports data from a file in .ini format.
:return: A dictionary of exports, mapping an export category to a list
of :class:`ExportEntry` instances describing the individual
export entries.
"""
result = {}
r = self.get_distinfo_resource(EXPORTS_FILENAME)
if r:
with contextlib.closing(r.as_stream()) as stream:
result = read_exports(stream)
return result
def write_exports(self, exports):
"""
Write a dictionary of exports to a file in .ini format.
:param exports: A dictionary of exports, mapping an export category to
a list of :class:`ExportEntry` instances describing the
individual export entries.
"""
rf = self.get_distinfo_file(EXPORTS_FILENAME)
with open(rf, 'w') as f:
write_exports(exports, f)
def get_resource_path(self, relative_path):
"""
NOTE: This API may change in the future.
Return the absolute path to a resource file with the given relative
path.
:param relative_path: The path, relative to .dist-info, of the resource
of interest.
:return: The absolute path where the resource is to be found.
"""
r = self.get_distinfo_resource('RESOURCES')
with contextlib.closing(r.as_stream()) as stream:
with CSVReader(stream=stream) as resources_reader:
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):
"""
Iterates over the ``RECORD`` entries and returns a tuple
``(path, hash, size)`` for each line.
:returns: iterator of (path, hash, size)
"""
for result in self._get_records():
yield result
def write_installed_files(self, paths, prefix, dry_run=False):
"""
Writes the ``RECORD`` file, using the ``paths`` iterable passed in. Any
existing ``RECORD`` file is silently overwritten.
prefix is used to determine when to write absolute paths.
"""
prefix = os.path.join(prefix, '')
base = os.path.dirname(self.path)
base_under_prefix = base.startswith(prefix)
base = os.path.join(base, '')
record_path = self.get_distinfo_file('RECORD')
logger.info('creating %s', record_path)
if dry_run:
return None
with CSVWriter(record_path) as writer:
for path in paths:
if os.path.isdir(path) or path.endswith(('.pyc', '.pyo')):
# do not put size and hash, as in PEP-376
hash_value = size = ''
else:
size = '%d' % os.path.getsize(path)
with open(path, 'rb') as fp:
hash_value = self.get_hash(fp.read())
if path.startswith(base) or (base_under_prefix and
path.startswith(prefix)):
path = os.path.relpath(path, base)
writer.writerow((path, hash_value, size))
# add the RECORD file itself
if record_path.startswith(base):
record_path = os.path.relpath(record_path, base)
writer.writerow((record_path, '', ''))
return record_path
def check_installed_files(self):
"""
Checks that the hashes and sizes of the files in ``RECORD`` are
matched by the files themselves. Returns a (possibly empty) list of
mismatches. Each entry in the mismatch list will be a tuple consisting
of the path, 'exists', 'size' or 'hash' according to what didn't match
(existence is checked first, then size, then hash), the expected
value and the actual value.
"""
mismatches = []
base = os.path.dirname(self.path)
record_path = self.get_distinfo_file('RECORD')
for path, hash_value, size in self.list_installed_files():
if not os.path.isabs(path):
path = os.path.join(base, path)
if path == record_path:
continue
if not os.path.exists(path):
mismatches.append((path, 'exists', True, False))
elif os.path.isfile(path):
actual_size = str(os.path.getsize(path))
if size and actual_size != size:
mismatches.append((path, 'size', size, actual_size))
elif hash_value:
if '=' in hash_value:
hasher = hash_value.split('=', 1)[0]
else:
hasher = None
with open(path, 'rb') as f:
actual_hash = self.get_hash(f.read(), hasher)
if actual_hash != hash_value:
mismatches.append((path, 'hash', hash_value, actual_hash))
return mismatches
@cached_property
def shared_locations(self):
"""
A dictionary of shared locations whose keys are in the set 'prefix',
'purelib', 'platlib', 'scripts', 'headers', 'data' and 'namespace'.
The corresponding value is the absolute path of that category for
this distribution, and takes into account any paths selected by the
user at installation time (e.g. via command-line arguments). In the
case of the 'namespace' key, this would be a list of absolute paths
for the roots of namespace packages in this distribution.
The first time this property is accessed, the relevant information is
read from the SHARED file in the .dist-info directory.
"""
result = {}
shared_path = os.path.join(self.path, 'SHARED')
if os.path.isfile(shared_path):
with codecs.open(shared_path, 'r', encoding='utf-8') as f:
lines = f.read().splitlines()
for line in lines:
key, value = line.split('=', 1)
if key == 'namespace':
result.setdefault(key, []).append(value)
else:
result[key] = value
return result
def write_shared_locations(self, paths, dry_run=False):
"""
Write shared location information to the SHARED file in .dist-info.
:param paths: A dictionary as described in the documentation for
:meth:`shared_locations`.
:param dry_run: If True, the action is logged but no file is actually
written.
:return: The path of the file written to.
"""
shared_path = os.path.join(self.path, 'SHARED')
logger.info('creating %s', shared_path)
if dry_run:
return None
lines = []
for key in ('prefix', 'lib', 'headers', 'scripts', 'data'):
path = paths[key]
if os.path.isdir(paths[key]):
lines.append('%s=%s' % (key, path))
for ns in paths.get('namespace', ()):
lines.append('namespace=%s' % ns)
with codecs.open(shared_path, 'w', encoding='utf-8') as f:
f.write('\n'.join(lines))
return shared_path
def get_distinfo_resource(self, path):
if path not in DIST_FILES:
raise DistlibException('invalid path for a dist-info file: '
'%r at %r' % (path, self.path))
finder = resources.finder_for_path(self.path)
if finder is None:
raise DistlibException('Unable to get a finder for %s' % self.path)
return finder.find(path)
def get_distinfo_file(self, path):
"""
Returns a path located under the ``.dist-info`` directory. Returns a
string representing the 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:`DistlibException` is raised
:type path: str
:rtype: str
"""
# 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 DistlibException(
'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 DistlibException('invalid path for a dist-info file: '
'%r at %r' % (path, self.path))
return os.path.join(self.path, path)
def list_distinfo_files(self):
"""
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.
:returns: iterator of paths
"""
base = os.path.dirname(self.path)
for path, checksum, size in self._get_records():
# XXX add separator or use real relpath algo
if not os.path.isabs(path):
path = os.path.join(base, path)
if path.startswith(self.path):
yield path
def __eq__(self, other):
return (isinstance(other, InstalledDistribution) and
self.path == other.path)
# See http://docs.python.org/reference/datamodel#object.__hash__
__hash__ = object.__hash__
class EggInfoDistribution(BaseInstalledDistribution):
"""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."""
requested = True # as we have no way of knowing, assume it was
shared_locations = {}
def __init__(self, path, env=None):
def set_name_and_version(s, n, v):
s.name = n
s.key = n.lower() # for case-insensitive comparisons
s.version = v
self.path = path
self.dist_path = env
if env and env._cache_enabled and path in env._cache_egg.path:
metadata = env._cache_egg.path[path].metadata
set_name_and_version(self, metadata.name, metadata.version)
else:
metadata = self._get_metadata(path)
# Need to be set before caching
set_name_and_version(self, metadata.name, metadata.version)
if env and env._cache_enabled:
env._cache_egg.add(self)
super(EggInfoDistribution, self).__init__(metadata, path, env)
def _get_metadata(self, path):
requires = None
def parse_requires_data(data):
"""Create a list of dependencies from a requires.txt file.
*data*: the contents of a setuptools-produced requires.txt file.
"""
reqs = []
lines = data.splitlines()
for line in lines:
line = line.strip()
if line.startswith('['):
logger.warning('Unexpected line: quitting requirement scan: %r',
line)
break
r = parse_requirement(line)
if not r:
logger.warning('Not recognised as a requirement: %r', line)
continue
if r.extras:
logger.warning('extra requirements in requires.txt are '
'not supported')
if not r.constraints:
reqs.append(r.name)
else:
cons = ', '.join('%s%s' % c for c in r.constraints)
reqs.append('%s (%s)' % (r.name, cons))
return reqs
def parse_requires_path(req_path):
"""Create a list of dependencies from a requires.txt file.
*req_path*: the path to a setuptools-produced requires.txt file.
"""
reqs = []
try:
with codecs.open(req_path, 'r', 'utf-8') as fp:
reqs = parse_requires_data(fp.read())
except IOError:
pass
return reqs
if path.endswith('.egg'):
if os.path.isdir(path):
meta_path = os.path.join(path, 'EGG-INFO', 'PKG-INFO')
metadata = Metadata(path=meta_path, scheme='legacy')
req_path = os.path.join(path, 'EGG-INFO', 'requires.txt')
requires = parse_requires_path(req_path)
else:
# FIXME handle the case where zipfile is not available
zipf = zipimport.zipimporter(path)
fileobj = StringIO(
zipf.get_data('EGG-INFO/PKG-INFO').decode('utf8'))
metadata = Metadata(fileobj=fileobj, scheme='legacy')
try:
data = zipf.get_data('EGG-INFO/requires.txt')
requires = parse_requires_data(data.decode('utf-8'))
except IOError:
requires = None
elif path.endswith('.egg-info'):
if os.path.isdir(path):
req_path = os.path.join(path, 'requires.txt')
requires = parse_requires_path(req_path)
path = os.path.join(path, 'PKG-INFO')
metadata = Metadata(path=path, scheme='legacy')
else:
raise DistlibException('path must end with .egg-info or .egg, '
'got %r' % path)
if requires:
metadata.add_requirements(requires)
return metadata
def __repr__(self):
return '<EggInfoDistribution %r %s at %r>' % (
self.name, self.version, self.path)
def __str__(self):
return "%s %s" % (self.name, self.version)
def check_installed_files(self):
"""
Checks that the hashes and sizes of the files in ``RECORD`` are
matched by the files themselves. Returns a (possibly empty) list of
mismatches. Each entry in the mismatch list will be a tuple consisting
of the path, 'exists', 'size' or 'hash' according to what didn't match
(existence is checked first, then size, then hash), the expected
value and the actual value.
"""
mismatches = []
record_path = os.path.join(self.path, 'installed-files.txt')
if os.path.exists(record_path):
for path, _, _ in self.list_installed_files():
if path == record_path:
continue
if not os.path.exists(path):
mismatches.append((path, 'exists', True, False))
return mismatches
def list_installed_files(self):
"""
Iterates over the ``installed-files.txt`` entries and returns a tuple
``(path, hash, size)`` for each line.
:returns: a list of (path, hash, size)
"""
def _md5(path):
f = open(path, 'rb')
try:
content = f.read()
finally:
f.close()
return hashlib.md5(content).hexdigest()
def _size(path):
return os.stat(path).st_size
record_path = os.path.join(self.path, 'installed-files.txt')
result = []
if os.path.exists(record_path):
with codecs.open(record_path, 'r', encoding='utf-8') as f:
for line in f:
line = line.strip()
p = os.path.normpath(os.path.join(self.path, line))
# "./" is present as a marker between installed files
# and installation metadata files
if not os.path.exists(p):
logger.warning('Non-existent file: %s', p)
if p.endswith(('.pyc', '.pyo')):
continue
#otherwise fall through and fail
if not os.path.isdir(p):
result.append((p, _md5(p), _size(p)))
result.append((record_path, None, None))
return result
def list_distinfo_files(self, absolute=False):
"""
Iterates over the ``installed-files.txt`` entries and returns paths for
each line if the path is pointing to a file located in the
``.egg-info`` directory or one of its subdirectories.
:parameter absolute: If *absolute* is ``True``, each returned path is
transformed into a local absolute path. Otherwise the
raw value from ``installed-files.txt`` is returned.
:type absolute: boolean
:returns: iterator of paths
"""
record_path = os.path.join(self.path, 'installed-files.txt')
skip = True
with codecs.open(record_path, 'r', encoding='utf-8') as f:
for line in f:
line = line.strip()
if line == './':
skip = False
continue
if not skip:
p = os.path.normpath(os.path.join(self.path, line))
if p.startswith(self.path):
if absolute:
yield p
else:
yield line
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__
new_dist_class = InstalledDistribution
old_dist_class = EggInfoDistribution
class DependencyGraph(object):
"""
Represents a dependency graph between distributions.
The dependency relationships are stored in an ``adjacency_list`` that maps
distributions to a list of ``(other, label)`` tuples where ``other``
is a distribution and the edge is labeled with ``label`` (i.e. the version
specifier, if such was provided). Also, for more efficient traversal, for
every distribution ``x``, a list of predecessors is kept in
``reverse_list[x]``. An edge from distribution ``a`` to
distribution ``b`` means that ``a`` depends on ``b``. If any missing
dependencies are found, they are stored in ``missing``, which is a
dictionary that maps distributions to a list of requirements that were not
provided by any other distributions.
"""
def __init__(self):
self.adjacency_list = {}
self.reverse_list = {}
self.missing = {}
def add_distribution(self, distribution):
"""Add the *distribution* to the graph.
:type distribution: :class:`distutils2.database.InstalledDistribution`
or :class:`distutils2.database.EggInfoDistribution`
"""
self.adjacency_list[distribution] = []
self.reverse_list[distribution] = []
#self.missing[distribution] = []
def add_edge(self, x, y, label=None):
"""Add an edge from distribution *x* to distribution *y* with the given
*label*.
:type x: :class:`distutils2.database.InstalledDistribution` or
:class:`distutils2.database.EggInfoDistribution`
:type y: :class:`distutils2.database.InstalledDistribution` or
:class:`distutils2.database.EggInfoDistribution`
:type label: ``str`` or ``None``
"""
self.adjacency_list[x].append((y, label))
# multiple edges are allowed, so be careful
if x not in self.reverse_list[y]:
self.reverse_list[y].append(x)
def add_missing(self, distribution, requirement):
"""
Add a missing *requirement* for the given *distribution*.
:type distribution: :class:`distutils2.database.InstalledDistribution`
or :class:`distutils2.database.EggInfoDistribution`
:type requirement: ``str``
"""
logger.debug('%s missing %r', distribution, requirement)
self.missing.setdefault(distribution, []).append(requirement)
def _repr_dist(self, dist):
return '%s %s' % (dist.name, dist.version)
def repr_node(self, dist, level=1):
"""Prints only a subgraph"""
output = [self._repr_dist(dist)]
for other, label in self.adjacency_list[dist]:
dist = self._repr_dist(other)
if label is not None:
dist = '%s [%s]' % (dist, label)
output.append(' ' * level + str(dist))
suboutput = self.repr_node(other, level + 1)
subs = suboutput.split('\n')
output.extend(subs[1:])
return '\n'.join(output)
def to_dot(self, f, skip_disconnected=True):
"""Writes a DOT output for the graph to the provided file *f*.
If *skip_disconnected* is set to ``True``, then all distributions
that are not dependent on any other distribution are skipped.
:type f: has to support ``file``-like operations
:type skip_disconnected: ``bool``
"""
disconnected = []
f.write("digraph dependencies {\n")
for dist, adjs in self.adjacency_list.items():
if len(adjs) == 0 and not skip_disconnected:
disconnected.append(dist)
for other, label in adjs:
if not label is None:
f.write('"%s" -> "%s" [label="%s"]\n' %
(dist.name, other.name, label))
else:
f.write('"%s" -> "%s"\n' % (dist.name, other.name))
if not skip_disconnected and len(disconnected) > 0:
f.write('subgraph disconnected {\n')
f.write('label = "Disconnected"\n')
f.write('bgcolor = red\n')
for dist in disconnected:
f.write('"%s"' % dist.name)
f.write('\n')
f.write('}\n')
f.write('}\n')
def topological_sort(self):
"""
Perform a topological sort of the graph.
:return: A tuple, the first element of which is a topologically sorted
list of distributions, and the second element of which is a
list of distributions that cannot be sorted because they have
circular dependencies and so form a cycle.
"""
result = []
# Make a shallow copy of the adjacency list
alist = {}
for k, v in self.adjacency_list.items():
alist[k] = v[:]
while True:
# See what we can remove in this run
to_remove = []
for k, v in list(alist.items())[:]:
if not v:
to_remove.append(k)
del alist[k]
if not to_remove:
# What's left in alist (if anything) is a cycle.
break
# Remove from the adjacency list of others
for k, v in alist.items():
alist[k] = [(d, r) for d, r in v if d not in to_remove]
logger.debug('Moving to result: %s',
['%s (%s)' % (d.name, d.version) for d in to_remove])
result.extend(to_remove)
return result, list(alist.keys())
def __repr__(self):
"""Representation of the graph"""
output = []
for dist, adjs in self.adjacency_list.items():
output.append(self.repr_node(dist))
return '\n'.join(output)
def make_graph(dists, scheme='default'):
"""Makes a dependency graph from the given distributions.
:parameter dists: a list of distributions
:type dists: list of :class:`distutils2.database.InstalledDistribution` and
:class:`distutils2.database.EggInfoDistribution` instances
:rtype: a :class:`DependencyGraph` instance
"""
scheme = get_scheme(scheme)
graph = DependencyGraph()
provided = {} # maps names to lists of (version, dist) tuples
# first, build the graph and find out what's provided
for dist in dists:
graph.add_distribution(dist)
for p in dist.provides:
name, version = parse_name_and_version(p)
logger.debug('Add to provided: %s, %s, %s', name, version, dist)
provided.setdefault(name, []).append((version, dist))
# now make the edges
for dist in dists:
requires = (dist.run_requires | dist.meta_requires |
dist.build_requires | dist.dev_requires)
for req in requires:
try:
matcher = scheme.matcher(req)
except UnsupportedVersionError:
# XXX compat-mode if cannot read the version
logger.warning('could not read version %r - using name only',
req)
name = req.split()[0]
matcher = scheme.matcher(name)
name = matcher.key # case-insensitive
matched = False
if name in provided:
for version, provider in provided[name]:
try:
match = matcher.match(version)
except UnsupportedVersionError:
match = False
if match:
graph.add_edge(dist, provider, req)
matched = True
break
if not matched:
graph.add_missing(dist, req)
return graph
def get_dependent_dists(dists, dist):
"""Recursively generate a list of distributions from *dists* that are
dependent on *dist*.
:param dists: a list of distributions
:param dist: a distribution, member of *dists* for which we are interested
"""
if dist not in dists:
raise DistlibException('given distribution %r is not a member '
'of the list' % dist.name)
graph = make_graph(dists)
dep = [dist] # dependent distributions
todo = graph.reverse_list[dist] # list of nodes we should inspect
while todo:
d = todo.pop()
dep.append(d)
for succ in graph.reverse_list[d]:
if succ not in dep:
todo.append(succ)
dep.pop(0) # remove dist from dep, was there to prevent infinite loops
return dep
def get_required_dists(dists, dist):
"""Recursively generate a list of distributions from *dists* that are
required by *dist*.
:param dists: a list of distributions
:param dist: a distribution, member of *dists* for which we are interested
"""
if dist not in dists:
raise DistlibException('given distribution %r is not a member '
'of the list' % dist.name)
graph = make_graph(dists)
req = [] # required distributions
todo = graph.adjacency_list[dist] # list of nodes we should inspect
while todo:
d = todo.pop()[0]
req.append(d)
for pred in graph.adjacency_list[d]:
if pred not in req:
todo.append(pred)
return req
def make_dist(name, version, **kwargs):
"""
A convenience method for making a dist given just a name and version.
"""
summary = kwargs.pop('summary', 'Placeholder for summary')
md = Metadata(**kwargs)
md.name = name
md.version = version
md.summary = summary or 'Placeholder for summary'
return Distribution(md)
|