# error.py - Mercurial exceptions

#

# Copyright 2005-2008 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

"""Mercurial exceptions.

This allows us to catch exceptions at higher levels without forcing

imports.

"""

from __future__ import absolute_import

# Do not import anything but pycompat here, please

from . import pycompat

def _tobytes(exc):

    """Byte-stringify exception in the same way as BaseException_str()"""

    if not exc.args:

        return b''

    if len(exc.args) == 1:

        return pycompat.bytestr(exc.args[0])

    return b'(%s)' % b', '.join(b"'%s'" % pycompat.bytestr(a) for a in exc.args)

class Hint(object):

    """Mix-in to provide a hint of an error

    This should come first in the inheritance list to consume a hint and

    pass remaining arguments to the exception class.

    """

    def __init__(self, *args, **kw):

        self.hint = kw.pop(r'hint', None)

        super(Hint, self).__init__(*args, **kw)

class StorageError(Hint, Exception):

    """Raised when an error occurs in a storage layer.

    Usually subclassed by a storage-specific exception.

    """

    __bytes__ = _tobytes

class RevlogError(StorageError):

    __bytes__ = _tobytes

class FilteredIndexError(IndexError):

    __bytes__ = _tobytes

class LookupError(RevlogError, KeyError):

    def __init__(self, name, index, message):

        self.name = name

        self.index = index

        # this can't be called 'message' because at least some installs of

        # Python 2.6+ complain about the 'message' property being deprecated

        self.lookupmessage = message

        if isinstance(name, bytes) and len(name) == 20:

            from .node import short

            name = short(name)

        RevlogError.__init__(self, '%s@%s: %s' % (index, name, message))

    def __bytes__(self):

        return RevlogError.__bytes__(self)

    def __str__(self):

        return RevlogError.__str__(self)

class AmbiguousPrefixLookupError(LookupError):

    pass

class FilteredLookupError(LookupError):

    pass

class ManifestLookupError(LookupError):

    pass

class CommandError(Exception):

    """Exception raised on errors in parsing the command line."""

    __bytes__ = _tobytes

class InterventionRequired(Hint, Exception):

    """Exception raised when a command requires human intervention."""

    __bytes__ = _tobytes

class Abort(Hint, Exception):

    """Raised if a command needs to print an error and exit."""

    __bytes__ = _tobytes

class HookLoadError(Abort):

    """raised when loading a hook fails, aborting an operation

    Exists to allow more specialized catching."""

class HookAbort(Abort):

    """raised when a validation hook fails, aborting an operation

    Exists to allow more specialized catching."""

class ConfigError(Abort):

    """Exception raised when parsing config files"""

class UpdateAbort(Abort):

    """Raised when an update is aborted for destination issue"""

class MergeDestAbort(Abort):

    """Raised when an update is aborted for destination issues"""

class NoMergeDestAbort(MergeDestAbort):

    """Raised when an update is aborted because there is nothing to merge"""

class ManyMergeDestAbort(MergeDestAbort):

    """Raised when an update is aborted because destination is ambiguous"""

class ResponseExpected(Abort):

    """Raised when an EOF is received for a prompt"""

    def __init__(self):

        from .i18n import _

        Abort.__init__(self, _('response expected'))

class OutOfBandError(Hint, Exception):

    """Exception raised when a remote repo reports failure"""

    __bytes__ = _tobytes

class ParseError(Hint, Exception):

    """Raised when parsing config files and {rev,file}sets (msg[, pos])"""

    __bytes__ = _tobytes

class PatchError(Exception):

    __bytes__ = _tobytes

class UnknownIdentifier(ParseError):

    """Exception raised when a {rev,file}set references an unknown identifier"""

    def __init__(self, function, symbols):

        from .i18n import _

        ParseError.__init__(self, _("unknown identifier: %s") % function)

        self.function = function

        self.symbols = symbols

class RepoError(Hint, Exception):

    __bytes__ = _tobytes

class RepoLookupError(RepoError):

    pass

class FilteredRepoLookupError(RepoLookupError):

    pass

class CapabilityError(RepoError):

    pass

class RequirementError(RepoError):

    """Exception raised if .hg/requires has an unknown entry."""

class StdioError(IOError):

    """Raised if I/O to stdout or stderr fails"""

    def __init__(self, err):

        IOError.__init__(self, err.errno, err.strerror)

    # no __bytes__() because error message is derived from the standard IOError

class UnsupportedMergeRecords(Abort):

    def __init__(self, recordtypes):

        from .i18n import _

        self.recordtypes = sorted(recordtypes)

        s = ' '.join(self.recordtypes)

        Abort.__init__(

            self, _('unsupported merge state records: %s') % s,

            hint=_('see https://mercurial-scm.org/wiki/MergeStateRecords for '

                   'more information'))

class UnknownVersion(Abort):

    """generic exception for aborting from an encounter with an unknown version

    """

    def __init__(self, msg, hint=None, version=None):

        self.version = version

        super(UnknownVersion, self).__init__(msg, hint=hint)

class LockError(IOError):

    def __init__(self, errno, strerror, filename, desc):

        IOError.__init__(self, errno, strerror, filename)

        self.desc = desc

    # no __bytes__() because error message is derived from the standard IOError

class LockHeld(LockError):

    def __init__(self, errno, filename, desc, locker):

        LockError.__init__(self, errno, 'Lock held', filename, desc)

        self.locker = locker

class LockUnavailable(LockError):

    pass

# LockError is for errors while acquiring the lock -- this is unrelated

class LockInheritanceContractViolation(RuntimeError):

    __bytes__ = _tobytes

class ResponseError(Exception):

    """Raised to print an error with part of output and exit."""

    __bytes__ = _tobytes

class UnknownCommand(Exception):

    """Exception raised if command is not in the command table."""

    __bytes__ = _tobytes

class AmbiguousCommand(Exception):

    """Exception raised if command shortcut matches more than one command."""

    __bytes__ = _tobytes

# derived from KeyboardInterrupt to simplify some breakout code

class SignalInterrupt(KeyboardInterrupt):

    """Exception raised on SIGTERM and SIGHUP."""

class SignatureError(Exception):

    __bytes__ = _tobytes

class PushRaced(RuntimeError):

    """An exception raised during unbundling that indicate a push race"""

    __bytes__ = _tobytes

class ProgrammingError(Hint, RuntimeError):

    """Raised if a mercurial (core or extension) developer made a mistake"""

    def __init__(self, msg, *args, **kwargs):

        # On Python 3, turn the message back into a string since this is

        # an internal-only error that won't be printed except in a

        # stack traces.

        msg = pycompat.sysstr(msg)

        super(ProgrammingError, self).__init__(msg, *args, **kwargs)

    __bytes__ = _tobytes

class WdirUnsupported(Exception):

    """An exception which is raised when 'wdir()' is not supported"""

    __bytes__ = _tobytes

# bundle2 related errors

class BundleValueError(ValueError):

    """error raised when bundle2 cannot be processed"""

    __bytes__ = _tobytes

class BundleUnknownFeatureError(BundleValueError):

    def __init__(self, parttype=None, params=(), values=()):

        self.parttype = parttype

        self.params = params

        self.values = values

        if self.parttype is None:

            msg = 'Stream Parameter'

        else:

            msg = parttype

        entries = self.params

        if self.params and self.values:

            assert len(self.params) == len(self.values)

            entries = []

            for idx, par in enumerate(self.params):

                val = self.values[idx]

                if val is None:

                    entries.append(val)

                else:

                    entries.append("%s=%r" % (par, pycompat.maybebytestr(val)))

        if entries:

            msg = '%s - %s' % (msg, ', '.join(entries))

        ValueError.__init__(self, msg)

class ReadOnlyPartError(RuntimeError):

    """error raised when code tries to alter a part being generated"""

    __bytes__ = _tobytes

class PushkeyFailed(Abort):

    """error raised when a pushkey part failed to update a value"""

    def __init__(self, partid, namespace=None, key=None, new=None, old=None,

                 ret=None):

        self.partid = partid

        self.namespace = namespace

        self.key = key

        self.new = new

        self.old = old

        self.ret = ret

        # no i18n expected to be processed into a better message

        Abort.__init__(self, 'failed to update value for "%s/%s"'

                       % (namespace, key))

class CensoredNodeError(StorageError):

    """error raised when content verification fails on a censored node

    Also contains the tombstone data substituted for the uncensored data.

    """

    def __init__(self, filename, node, tombstone):

        from .node import short

        StorageError.__init__(self, '%s:%s' % (filename, short(node)))

        self.tombstone = tombstone

class CensoredBaseError(StorageError):

    """error raised when a delta is rejected because its base is censored

    A delta based on a censored revision must be formed as single patch

    operation which replaces the entire base with new content. This ensures

    the delta may be applied by clones which have not censored the base.

    """

class InvalidBundleSpecification(Exception):

    """error raised when a bundle specification is invalid.

    This is used for syntax errors as opposed to support errors.

    """

    __bytes__ = _tobytes

class UnsupportedBundleSpecification(Exception):

    """error raised when a bundle specification is not supported."""

    __bytes__ = _tobytes

class CorruptedState(Exception):

    """error raised when a command is not able to read its state from file"""

    __bytes__ = _tobytes

class PeerTransportError(Abort):

    """Transport-level I/O error when communicating with a peer repo."""

class InMemoryMergeConflictsError(Exception):

    """Exception raised when merge conflicts arose during an in-memory merge."""

    __bytes__ = _tobytes

class WireprotoCommandError(Exception):

    """Represents an error during execution of a wire protocol command.

    Should only be thrown by wire protocol version 2 commands.

    The error is a formatter string and an optional iterable of arguments.

    """

    def __init__(self, message, args=None):

        self.message = message

        self.messageargs = args