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File Name : exceptions.py

"""Exceptions used throughout package"""
from __future__ import absolute_import

from itertools import chain, groupby, repeat

from pip._vendor.six import iteritems

class PipError(Exception):
    """Base pip exception"""

class InstallationError(PipError):
    """General exception during installation"""

class UninstallationError(PipError):
    """General exception during uninstallation"""

class DistributionNotFound(InstallationError):
    """Raised when a distribution cannot be found to satisfy a requirement"""

class RequirementsFileParseError(InstallationError):
    """Raised when a general error occurs parsing a requirements file line."""

class BestVersionAlreadyInstalled(PipError):
    """Raised when the most up-to-date version of a package is already
    installed."""

class BadCommand(PipError):
    """Raised when virtualenv or a command is not found"""

class CommandError(PipError):
    """Raised when there is an error in command-line arguments"""

class PreviousBuildDirError(PipError):
    """Raised when there's a previous conflicting build directory"""

class InvalidWheelFilename(InstallationError):
    """Invalid wheel filename."""

class UnsupportedWheel(InstallationError):
    """Unsupported wheel."""

class HashErrors(InstallationError):
    """Multiple HashError instances rolled into one for reporting"""

def __init__(self):
        self.errors = []

def append(self, error):
        self.errors.append(error)

def __str__(self):
        lines = []
        self.errors.sort(key=lambda e: e.order)
        for cls, errors_of_cls in groupby(self.errors, lambda e: e.__class__):
            lines.append(cls.head)
            lines.extend(e.body() for e in errors_of_cls)
        if lines:
            return '\n'.join(lines)

def __nonzero__(self):
        return bool(self.errors)

def __bool__(self):
        return self.__nonzero__()

class HashError(InstallationError):
    """
    A failure to verify a package against known-good hashes

:cvar order: An int sorting hash exception classes by difficulty of
        recovery (lower being harder), so the user doesn't bother fretting
        about unpinned packages when he has deeper issues, like VCS
        dependencies, to deal with. Also keeps error reports in a
        deterministic order.
    :cvar head: A section heading for display above potentially many
        exceptions of this kind
    :ivar req: The InstallRequirement that triggered this error. This is
        pasted on after the exception is instantiated, because it's not
        typically available earlier.

"""
    req = None
    head = ''

def body(self):
        """Return a summary of me for display under the heading.

This default implementation simply prints a description of the
        triggering requirement.

:param req: The InstallRequirement that provoked this error, with
            populate_link() having already been called

"""
        return '    %s' % self._requirement_name()

def __str__(self):
        return '%s\n%s' % (self.head, self.body())

def _requirement_name(self):
        """Return a description of the requirement that triggered me.

This default implementation returns long description of the req, with
        line numbers

"""
        return str(self.req) if self.req else 'unknown package'

class VcsHashUnsupported(HashError):
    """A hash was provided for a version-control-system-based requirement, but
    we don't have a method for hashing those."""

order = 0
    head = ("Can't verify hashes for these requirements because we don't "
            "have a way to hash version control repositories:")

class DirectoryUrlHashUnsupported(HashError):
    """A hash was provided for a version-control-system-based requirement, but
    we don't have a method for hashing those."""

order = 1
    head = ("Can't verify hashes for these file:// requirements because they "
            "point to directories:")

class HashMissing(HashError):
    """A hash was needed for a requirement but is absent."""

order = 2
    head = ('Hashes are required in --require-hashes mode, but they are '
            'missing from some requirements. Here is a list of those '
            'requirements along with the hashes their downloaded archives '
            'actually had. Add lines like these to your requirements files to '
            'prevent tampering. (If you did not enable --require-hashes '
            'manually, note that it turns on automatically when any package '
            'has a hash.)')

def __init__(self, gotten_hash):
        """
        :param gotten_hash: The hash of the (possibly malicious) archive we
            just downloaded
        """
        self.gotten_hash = gotten_hash

def body(self):
        from pip.utils.hashes import FAVORITE_HASH  # Dodge circular import.

package = None
        if self.req:
            # In the case of URL-based requirements, display the original URL
            # seen in the requirements file rather than the package name,
            # so the output can be directly copied into the requirements file.
            package = (self.req.original_link if self.req.original_link
                       # In case someone feeds something downright stupid
                       # to InstallRequirement's constructor.
                       else getattr(self.req, 'req', None))
        return '    %s --hash=%s:%s' % (package or 'unknown package',
                                        FAVORITE_HASH,
                                        self.gotten_hash)

class HashUnpinned(HashError):
    """A requirement had a hash specified but was not pinned to a specific
    version."""

order = 3
    head = ('In --require-hashes mode, all requirements must have their '
            'versions pinned with ==. These do not:')

class HashMismatch(HashError):
    """
    Distribution file hash values don't match.

:ivar package_name: The name of the package that triggered the hash
        mismatch. Feel free to write to this after the exception is raise to
        improve its error message.

"""
    order = 4
    head = ('THESE PACKAGES DO NOT MATCH THE HASHES FROM THE REQUIREMENTS '
            'FILE. If you have updated the package versions, please update '
            'the hashes. Otherwise, examine the package contents carefully; '
            'someone may have tampered with them.')

def __init__(self, allowed, gots):
        """
        :param allowed: A dict of algorithm names pointing to lists of allowed
            hex digests
        :param gots: A dict of algorithm names pointing to hashes we
            actually got from the files under suspicion
        """
        self.allowed = allowed
        self.gots = gots

def body(self):
        return '    %s:\n%s' % (self._requirement_name(),
                                self._hash_comparison())

def _hash_comparison(self):
        """
        Return a comparison of actual and expected hash values.

Example::

Expected sha256 abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcde
                            or 123451234512345123451234512345123451234512345
                    Got        bcdefbcdefbcdefbcdefbcdefbcdefbcdefbcdefbcdef

"""
        def hash_then_or(hash_name):
            # For now, all the decent hashes have 6-char names, so we can get
            # away with hard-coding space literals.
            return chain([hash_name], repeat('    or'))

lines = []
        for hash_name, expecteds in iteritems(self.allowed):
            prefix = hash_then_or(hash_name)
            lines.extend(('        Expected %s %s' % (next(prefix), e))
                         for e in expecteds)
            lines.append('             Got        %s\n' %
                         self.gots[hash_name].hexdigest())
            prefix = '    or'
        return '\n'.join(lines)

class UnsupportedPythonVersion(InstallationError):
    """Unsupported python version according to Requires-Python package
    metadata."""

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-06-15 07:02:14
..	dir	-	root/root	0755	2025-11-07 03:27:23
__pycache__	dir	-	root/root	0755	2024-06-15 07:02:14
_vendor	dir	-	root/root	0755	2024-06-15 07:02:14
commands	dir	-	root/root	0755	2024-06-15 07:02:14
compat	dir	-	root/root	0755	2024-06-15 07:02:14
models	dir	-	root/root	0755	2024-06-15 07:02:14
operations	dir	-	root/root	0755	2024-06-15 07:02:14
req	dir	-	root/root	0755	2024-06-15 07:02:14
utils	dir	-	root/root	0755	2024-06-15 07:02:14
vcs	dir	-	root/root	0755	2024-06-15 07:02:14
__init__.py	text/x-script.python	11.65 KB	root/root	0644	2024-04-06 01:40:45
__main__.py	text/plain	584 B	root/root	0644	2024-04-06 01:40:45
basecommand.py	text/plain	11.63 KB	root/root	0644	2024-04-06 01:40:45
baseparser.py	text/plain	10.22 KB	root/root	0644	2024-04-06 01:40:45
cmdoptions.py	text/plain	16.09 KB	root/root	0644	2024-04-06 01:40:45
download.py	text/x-script.python	32.08 KB	root/root	0644	2024-04-06 01:40:45
exceptions.py	text/plain	7.93 KB	root/root	0644	2024-04-06 01:40:45
index.py	text/plain	40.58 KB	root/root	0644	2024-04-06 01:40:45
locations.py	text/plain	5.49 KB	root/root	0644	2024-04-06 01:40:45
pep425tags.py	text/plain	10.72 KB	root/root	0644	2024-04-06 01:40:45
status_codes.py	text/x-script.python	156 B	root/root	0644	2024-04-06 01:40:45
wheel.py	text/plain	31.53 KB	root/root	0644	2024-04-06 01:40:45

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