236 lines
7.6 KiB
Python
236 lines
7.6 KiB
Python
"""Exceptions used throughout package"""
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from __future__ import absolute_import
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from itertools import chain, groupby, repeat
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from pip._vendor.six import iteritems
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class PipError(Exception):
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"""Base pip exception"""
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class InstallationError(PipError):
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"""General exception during installation"""
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class UninstallationError(PipError):
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"""General exception during uninstallation"""
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class DistributionNotFound(InstallationError):
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"""Raised when a distribution cannot be found to satisfy a requirement"""
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class RequirementsFileParseError(InstallationError):
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"""Raised when a general error occurs parsing a requirements file line."""
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class BestVersionAlreadyInstalled(PipError):
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"""Raised when the most up-to-date version of a package is already
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installed."""
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class BadCommand(PipError):
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"""Raised when virtualenv or a command is not found"""
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class CommandError(PipError):
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"""Raised when there is an error in command-line arguments"""
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class PreviousBuildDirError(PipError):
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"""Raised when there's a previous conflicting build directory"""
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class InvalidWheelFilename(InstallationError):
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"""Invalid wheel filename."""
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class UnsupportedWheel(InstallationError):
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"""Unsupported wheel."""
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class HashErrors(InstallationError):
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"""Multiple HashError instances rolled into one for reporting"""
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def __init__(self):
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self.errors = []
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def append(self, error):
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self.errors.append(error)
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def __str__(self):
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lines = []
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self.errors.sort(key=lambda e: e.order)
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for cls, errors_of_cls in groupby(self.errors, lambda e: e.__class__):
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lines.append(cls.head)
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lines.extend(e.body() for e in errors_of_cls)
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if lines:
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return '\n'.join(lines)
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def __nonzero__(self):
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return bool(self.errors)
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def __bool__(self):
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return self.__nonzero__()
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class HashError(InstallationError):
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"""
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A failure to verify a package against known-good hashes
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:cvar order: An int sorting hash exception classes by difficulty of
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recovery (lower being harder), so the user doesn't bother fretting
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about unpinned packages when he has deeper issues, like VCS
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dependencies, to deal with. Also keeps error reports in a
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deterministic order.
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:cvar head: A section heading for display above potentially many
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exceptions of this kind
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:ivar req: The InstallRequirement that triggered this error. This is
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pasted on after the exception is instantiated, because it's not
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typically available earlier.
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"""
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req = None
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head = ''
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def body(self):
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"""Return a summary of me for display under the heading.
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This default implementation simply prints a description of the
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triggering requirement.
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:param req: The InstallRequirement that provoked this error, with
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populate_link() having already been called
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"""
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return ' %s' % self._requirement_name()
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def __str__(self):
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return '%s\n%s' % (self.head, self.body())
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def _requirement_name(self):
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"""Return a description of the requirement that triggered me.
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This default implementation returns long description of the req, with
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line numbers
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"""
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return str(self.req) if self.req else 'unknown package'
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class VcsHashUnsupported(HashError):
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"""A hash was provided for a version-control-system-based requirement, but
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we don't have a method for hashing those."""
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order = 0
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head = ("Can't verify hashes for these requirements because we don't "
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"have a way to hash version control repositories:")
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class DirectoryUrlHashUnsupported(HashError):
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"""A hash was provided for a version-control-system-based requirement, but
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we don't have a method for hashing those."""
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order = 1
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head = ("Can't verify hashes for these file:// requirements because they "
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"point to directories:")
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class HashMissing(HashError):
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"""A hash was needed for a requirement but is absent."""
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order = 2
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head = ('Hashes are required in --require-hashes mode, but they are '
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'missing from some requirements. Here is a list of those '
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'requirements along with the hashes their downloaded archives '
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'actually had. Add lines like these to your requirements files to '
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'prevent tampering. (If you did not enable --require-hashes '
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'manually, note that it turns on automatically when any package '
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'has a hash.)')
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def __init__(self, gotten_hash):
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"""
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:param gotten_hash: The hash of the (possibly malicious) archive we
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just downloaded
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"""
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self.gotten_hash = gotten_hash
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def body(self):
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from pip.utils.hashes import FAVORITE_HASH # Dodge circular import.
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package_name = (self.req.req if self.req and
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# In case someone feeds something
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# downright stupid to
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# InstallRequirement's constructor:
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getattr(self.req, 'req', None)
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else 'unknown package')
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return ' %s --hash=%s:%s' % (package_name,
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FAVORITE_HASH,
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self.gotten_hash)
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class HashUnpinned(HashError):
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"""A requirement had a hash specified but was not pinned to a specific
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version."""
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order = 3
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head = ('In --require-hashes mode, all requirements must have their '
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'versions pinned with ==. These do not:')
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class HashMismatch(HashError):
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"""
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Distribution file hash values don't match.
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:ivar package_name: The name of the package that triggered the hash
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mismatch. Feel free to write to this after the exception is raise to
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improve its error message.
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"""
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order = 4
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head = ('THESE PACKAGES DO NOT MATCH THE HASHES FROM THE REQUIREMENTS '
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'FILE. If you have updated the package versions, please update '
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'the hashes. Otherwise, examine the package contents carefully; '
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'someone may have tampered with them.')
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def __init__(self, allowed, gots):
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"""
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:param allowed: A dict of algorithm names pointing to lists of allowed
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hex digests
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:param gots: A dict of algorithm names pointing to hashes we
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actually got from the files under suspicion
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"""
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self.allowed = allowed
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self.gots = gots
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def body(self):
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return ' %s:\n%s' % (self._requirement_name(),
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self._hash_comparison())
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def _hash_comparison(self):
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"""
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Return a comparison of actual and expected hash values.
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Example::
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Expected sha256 abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcde
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or 123451234512345123451234512345123451234512345
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Got bcdefbcdefbcdefbcdefbcdefbcdefbcdefbcdefbcdef
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"""
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def hash_then_or(hash_name):
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# For now, all the decent hashes have 6-char names, so we can get
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# away with hard-coding space literals.
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return chain([hash_name], repeat(' or'))
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lines = []
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for hash_name, expecteds in iteritems(self.allowed):
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prefix = hash_then_or(hash_name)
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lines.extend((' Expected %s %s' % (next(prefix), e))
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for e in expecteds)
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lines.append(' Got %s\n' %
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self.gots[hash_name].hexdigest())
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prefix = ' or'
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return '\n'.join(lines)
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