rewriteutil: check for divergence
This code is adapted from the code in the evolve extension. It seems
to be equivalent as far as the evolve extension's test suite can tell
(the only impact when making their `precheck()` delegate to our
version is that error messages are less detailed).
I had to change the error message to work with "change branch of"
being inserted as the action.
Differential Revision: https://phab.mercurial-scm.org/D10518
# error.py - Mercurial exceptions
#
# Copyright 2005-2008 Olivia Mackall <olivia@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
import difflib
# Do not import anything but pycompat here, please
from . import pycompat
if pycompat.TYPE_CHECKING:
from typing import (
Any,
AnyStr,
Iterable,
List,
Optional,
Sequence,
Union,
)
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('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):
pass
class SidedataHashError(RevlogError):
def __init__(self, key, expected, got):
self.hint = None
self.sidedatakey = key
self.expecteddigest = expected
self.actualdigest = got
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 hex
name = hex(name)
# if name is a binary node, it can be None
RevlogError.__init__(
self, b'%s@%s: %s' % (index, pycompat.bytestr(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."""
def __init__(self, command, message):
# type: (bytes, bytes) -> None
self.command = command
self.message = message
super(CommandError, self).__init__()
__bytes__ = _tobytes
class UnknownCommand(Exception):
"""Exception raised if command is not in the command table."""
def __init__(self, command, all_commands=None):
# type: (bytes, Optional[List[bytes]]) -> None
self.command = command
self.all_commands = all_commands
super(UnknownCommand, self).__init__()
__bytes__ = _tobytes
class AmbiguousCommand(Exception):
"""Exception raised if command shortcut matches more than one command."""
def __init__(self, prefix, matches):
# type: (bytes, List[bytes]) -> None
self.prefix = prefix
self.matches = matches
super(AmbiguousCommand, self).__init__()
__bytes__ = _tobytes
class WorkerError(Exception):
"""Exception raised when a worker process dies."""
def __init__(self, status_code):
# type: (int) -> None
self.status_code = status_code
# Pass status code to superclass just so it becomes part of __bytes__
super(WorkerError, self).__init__(status_code)
__bytes__ = _tobytes
class InterventionRequired(Hint, Exception):
"""Exception raised when a command requires human intervention."""
__bytes__ = _tobytes
class ConflictResolutionRequired(InterventionRequired):
"""Exception raised when a continuable command required merge conflict resolution."""
def __init__(self, opname):
# type: (bytes) -> None
from .i18n import _
self.opname = opname
InterventionRequired.__init__(
self,
_(
b"unresolved conflicts (see 'hg resolve', then 'hg %s --continue')"
)
% opname,
)
class Abort(Hint, Exception):
"""Raised if a command needs to print an error and exit."""
def __init__(self, message, hint=None):
# type: (bytes, Optional[bytes]) -> None
self.message = message
self.hint = hint
# Pass the message into the Exception constructor to help extensions
# that look for exc.args[0].
Exception.__init__(self, message)
def __bytes__(self):
return self.message
if pycompat.ispy3:
def __str__(self):
# the output would be unreadable if the message was translated,
# but do not replace it with encoding.strfromlocal(), which
# may raise another exception.
return pycompat.sysstr(self.__bytes__())
def format(self):
# type: () -> bytes
from .i18n import _
message = _(b"abort: %s\n") % self.message
if self.hint:
message += _(b"(%s)\n") % self.hint
return message
class InputError(Abort):
"""Indicates that the user made an error in their input.
Examples: Invalid command, invalid flags, invalid revision.
"""
class StateError(Abort):
"""Indicates that the operation might work if retried in a different state.
Examples: Unresolved merge conflicts, unfinished operations.
"""
class CanceledError(Abort):
"""Indicates that the user canceled the operation.
Examples: Close commit editor with error status, quit chistedit.
"""
class SecurityError(Abort):
"""Indicates that some aspect of security failed.
Examples: Bad server credentials, expired local credentials for network
filesystem, mismatched GPG signature, DoS protection.
"""
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"""
def __init__(self, message, location=None, hint=None):
# type: (bytes, Optional[bytes], Optional[bytes]) -> None
super(ConfigError, self).__init__(message, hint=hint)
self.location = location
def format(self):
# type: () -> bytes
from .i18n import _
if self.location is not None:
message = _(b"config error at %s: %s\n") % (
pycompat.bytestr(self.location),
self.message,
)
else:
message = _(b"config error: %s\n") % self.message
if self.hint:
message += _(b"(%s)\n") % self.hint
return message
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, _(b'response expected'))
class RemoteError(Abort):
"""Exception raised when interacting with a remote repo fails"""
class OutOfBandError(RemoteError):
"""Exception raised when a remote repo reports failure"""
def __init__(self, message=None, hint=None):
from .i18n import _
if message:
# Abort.format() adds a trailing newline
message = _(b"remote error:\n%s") % message.rstrip(b'\n')
else:
message = _(b"remote error")
super(OutOfBandError, self).__init__(message, hint=hint)
class ParseError(Abort):
"""Raised when parsing config files and {rev,file}sets (msg[, pos])"""
def __init__(self, message, location=None, hint=None):
# type: (bytes, Optional[Union[bytes, int]], Optional[bytes]) -> None
super(ParseError, self).__init__(message, hint=hint)
self.location = location
def format(self):
# type: () -> bytes
from .i18n import _
if self.location is not None:
message = _(b"hg: parse error at %s: %s\n") % (
pycompat.bytestr(self.location),
self.message,
)
else:
message = _(b"hg: parse error: %s\n") % self.message
if self.hint:
message += _(b"(%s)\n") % self.hint
return message
class PatchError(Exception):
__bytes__ = _tobytes
def getsimilar(symbols, value):
# type: (Iterable[bytes], bytes) -> List[bytes]
sim = lambda x: difflib.SequenceMatcher(None, value, x).ratio()
# The cutoff for similarity here is pretty arbitrary. It should
# probably be investigated and tweaked.
return [s for s in symbols if sim(s) > 0.6]
def similarity_hint(similar):
# type: (List[bytes]) -> Optional[bytes]
from .i18n import _
if len(similar) == 1:
return _(b"did you mean %s?") % similar[0]
elif similar:
ss = b", ".join(sorted(similar))
return _(b"did you mean one of %s?") % ss
else:
return None
class UnknownIdentifier(ParseError):
"""Exception raised when a {rev,file}set references an unknown identifier"""
def __init__(self, function, symbols):
# type: (bytes, Iterable[bytes]) -> None
from .i18n import _
similar = getsimilar(symbols, function)
hint = similarity_hint(similar)
ParseError.__init__(
self, _(b"unknown identifier: %s") % function, hint=hint
)
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):
# type: (IOError) -> None
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):
# type: (Iterable[bytes]) -> None
from .i18n import _
self.recordtypes = sorted(recordtypes)
s = b' '.join(self.recordtypes)
Abort.__init__(
self,
_(b'unsupported merge state records: %s') % s,
hint=_(
b'see https://mercurial-scm.org/wiki/MergeStateRecords for '
b'more information'
),
)
class UnknownVersion(Abort):
"""generic exception for aborting from an encounter with an unknown version"""
def __init__(self, msg, hint=None, version=None):
# type: (bytes, Optional[bytes], Optional[bytes]) -> None
self.version = version
super(UnknownVersion, self).__init__(msg, hint=hint)
class LockError(IOError):
def __init__(self, errno, strerror, filename, desc):
# TODO: figure out if this should be bytes or str
# _type: (int, str, str, bytes) -> None
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, b'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
# 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):
# type: (AnyStr, Any, Any) -> None
# 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 = b'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(b"%s=%r" % (par, pycompat.maybebytestr(val)))
if entries:
msg = b'%s - %s' % (msg, b', '.join(entries))
ValueError.__init__(self, msg) # TODO: convert to str?
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, b'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):
# type: (bytes, bytes, bytes) -> None
from .node import short
StorageError.__init__(self, b'%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):
# type: (bytes, Optional[Sequence[bytes]]) -> None
self.message = message
self.messageargs = args