copies: avoid instancing more changectx to access parent revisions
We just need to know the revision numbers of the parents, creating full context
is needlessly expensive.
This provide a small, but noticeable performance boost.
revision: large amount; added files: large amount; rename small amount;
c3b14617fbd7 9ba6ab77fd29
before: ! wall 2.885636 comb 2.900000 user 2.870000 sys 0.030000 (median of 10)
after: ! wall 2.702270 comb 2.710000 user 2.690000 sys 0.020000 (median of 10)
revision: large amount; added files: small amount; rename small amount;
c3b14617fbd7 f650a9b140d2
before: ! wall 4.298271 comb 4.290000 user 4.240000 sys 0.050000 (median of 10)
after: ! wall 3.976610 comb 3.970000 user 3.920000 sys 0.050000 (median of 10)
revision: large amount; added files: large amount; rename large amount;
08ea3258278e d9fa043f30c0
before: ! wall 0.773397 comb 0.770000 user 0.770000 sys 0.000000 (median of 11)
after: ! wall 0.701634 comb 0.700000 user 0.700000 sys 0.000000 (median of 13)
revision: small amount; added files: large amount; rename large amount;
df6f7a526b60 a83dc6a2d56f
before: ! wall 0.013585 comb 0.010000 user 0.010000 sys 0.000000 (median of 217)
after: ! wall 0.013550 comb 0.010000 user 0.010000 sys 0.000000 (median of 218)
revision: small amount; added files: large amount; rename small amount;
4aa4e1f8e19a 169138063d63
before: ! wall 0.003202 comb 0.000000 user 0.000000 sys 0.000000 (median of 929)
after: ! wall 0.002993 comb 0.010000 user 0.010000 sys 0.000000 (median of 992)
revision: small amount; added files: small amount; rename small amount;
4bc173b045a6 964879152e2e
before: ! wall 0.000077 comb 0.000000 user 0.000000 sys 0.000000 (median of 12060)
after: ! wall 0.000072 comb 0.000000 user 0.000000 sys 0.000000 (median of 12804)
revision: medium amount; added files: large amount; rename medium amount;
c95f1ced15f2 2c68e87c3efe
before: ! wall 0.510614 comb 0.500000 user 0.500000 sys 0.000000 (median of 18)
after: ! wall 0.473681 comb 0.470000 user 0.470000 sys 0.000000 (median of 20)
revision: medium amount; added files: medium amount; rename small amount;
d343da0c55a8 d7746d32bf9d
before: ! wall 0.126552 comb 0.130000 user 0.130000 sys 0.000000 (median of 77)
after: ! wall 0.115240 comb 0.110000 user 0.110000 sys 0.000000 (median of 85)
Differential Revision: https://phab.mercurial-scm.org/D7122
# 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 SidedataHashError(RevlogError):
def __init__(self, key, expected, got):
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 short
name = short(name)
RevlogError.__init__(self, b'%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, _(b'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, _(b"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 = 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):
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, 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
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 = 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)
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):
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):
self.message = message
self.messageargs = args