mercurial/error.py
author Gregory Szorc <gregory.szorc@gmail.com>
Sat, 27 Feb 2016 18:22:49 -0800
branchstable
changeset 28289 d493d64757eb
parent 27628 707d66afce21
child 28141 13bb8de97f87
permissions -rw-r--r--
hg: obtain lock when creating share from pooled repo (issue5104) There are race conditions between clients performing a shared clone to pooled storage: 1) Clients race to create the new shared repo in the pool directory 2) 1 client is seeding the repo in the pool directory and another goes to share it before it is fully cloned We prevent these race conditions by obtaining a lock in the pool directory that is derived from the name of the repo we will be accessing. To test this, a simple generic "lockdelay" extension has been added. The extension inserts an optional, configurable delay before or after lock acquisition. In the test, we delay 2 seconds after lock acquisition in the first process and 1 second before lock acquisition in the 2nd process. This means the first process has 1s to obtain the lock. There is a race condition here. If we encounter it in the wild, we could change the dummy extension to wait on the lock file to appear instead of relying on timing. But that's more complicated. Let's see what happens first.
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# error.py - Mercurial exceptions
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#
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# Copyright 2005-2008 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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"""Mercurial exceptions.
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This allows us to catch exceptions at higher levels without forcing
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imports.
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"""
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from __future__ import absolute_import
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# Do not import anything here, please
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class HintException(Exception):
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    def __init__(self, *args, **kw):
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        Exception.__init__(self, *args)
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        self.hint = kw.get('hint')
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class RevlogError(HintException):
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    pass
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class FilteredIndexError(IndexError):
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    pass
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class LookupError(RevlogError, KeyError):
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    def __init__(self, name, index, message):
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        self.name = name
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        self.index = index
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        # this can't be called 'message' because at least some installs of
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        # Python 2.6+ complain about the 'message' property being deprecated
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        self.lookupmessage = message
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        if isinstance(name, str) and len(name) == 20:
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            from .node import short
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            name = short(name)
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        RevlogError.__init__(self, '%s@%s: %s' % (index, name, message))
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    def __str__(self):
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        return RevlogError.__str__(self)
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class FilteredLookupError(LookupError):
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    pass
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class ManifestLookupError(LookupError):
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    pass
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class CommandError(Exception):
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    """Exception raised on errors in parsing the command line."""
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class InterventionRequired(HintException):
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    """Exception raised when a command requires human intervention."""
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class Abort(HintException):
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    """Raised if a command needs to print an error and exit."""
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class HookLoadError(Abort):
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    """raised when loading a hook fails, aborting an operation
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    Exists to allow more specialized catching."""
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class HookAbort(Abort):
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    """raised when a validation hook fails, aborting an operation
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    Exists to allow more specialized catching."""
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class ConfigError(Abort):
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    """Exception raised when parsing config files"""
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class UpdateAbort(Abort):
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    """Raised when an update is aborted for destination issue"""
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class ResponseExpected(Abort):
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    """Raised when an EOF is received for a prompt"""
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    def __init__(self):
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        from .i18n import _
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        Abort.__init__(self, _('response expected'))
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class OutOfBandError(HintException):
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    """Exception raised when a remote repo reports failure"""
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class ParseError(HintException):
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    """Raised when parsing config files and {rev,file}sets (msg[, pos])"""
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class UnknownIdentifier(ParseError):
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    """Exception raised when a {rev,file}set references an unknown identifier"""
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    def __init__(self, function, symbols):
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        from .i18n import _
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        ParseError.__init__(self, _("unknown identifier: %s") % function)
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        self.function = function
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        self.symbols = symbols
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class RepoError(HintException):
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    pass
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class RepoLookupError(RepoError):
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    pass
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class FilteredRepoLookupError(RepoLookupError):
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    pass
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class CapabilityError(RepoError):
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    pass
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class RequirementError(RepoError):
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    """Exception raised if .hg/requires has an unknown entry."""
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class UnsupportedMergeRecords(Abort):
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    def __init__(self, recordtypes):
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        from .i18n import _
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        self.recordtypes = sorted(recordtypes)
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        s = ' '.join(self.recordtypes)
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        Abort.__init__(
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            self, _('unsupported merge state records: %s') % s,
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            hint=_('see https://mercurial-scm.org/wiki/MergeStateRecords for '
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                   'more information'))
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class LockError(IOError):
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    def __init__(self, errno, strerror, filename, desc):
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        IOError.__init__(self, errno, strerror, filename)
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        self.desc = desc
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class LockHeld(LockError):
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    def __init__(self, errno, filename, desc, locker):
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        LockError.__init__(self, errno, 'Lock held', filename, desc)
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        self.locker = locker
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class LockUnavailable(LockError):
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    pass
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# LockError is for errors while acquiring the lock -- this is unrelated
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class LockInheritanceContractViolation(RuntimeError):
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    pass
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class ResponseError(Exception):
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    """Raised to print an error with part of output and exit."""
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class UnknownCommand(Exception):
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    """Exception raised if command is not in the command table."""
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class AmbiguousCommand(Exception):
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    """Exception raised if command shortcut matches more than one command."""
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# derived from KeyboardInterrupt to simplify some breakout code
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class SignalInterrupt(KeyboardInterrupt):
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    """Exception raised on SIGTERM and SIGHUP."""
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class SignatureError(Exception):
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    pass
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class PushRaced(RuntimeError):
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    """An exception raised during unbundling that indicate a push race"""
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# bundle2 related errors
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class BundleValueError(ValueError):
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    """error raised when bundle2 cannot be processed"""
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class BundleUnknownFeatureError(BundleValueError):
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    def __init__(self, parttype=None, params=(), values=()):
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        self.parttype = parttype
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        self.params = params
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        self.values = values
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        if self.parttype is None:
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            msg = 'Stream Parameter'
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        else:
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            msg = parttype
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        entries = self.params
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        if self.params and self.values:
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            assert len(self.params) == len(self.values)
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            entries = []
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            for idx, par in enumerate(self.params):
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                val = self.values[idx]
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                if val is None:
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                    entries.append(val)
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                else:
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                    entries.append("%s=%r" % (par, val))
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        if entries:
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            msg = '%s - %s' % (msg, ', '.join(entries))
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        ValueError.__init__(self, msg)
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class ReadOnlyPartError(RuntimeError):
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    """error raised when code tries to alter a part being generated"""
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class PushkeyFailed(Abort):
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    """error raised when a pushkey part failed to update a value"""
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    def __init__(self, partid, namespace=None, key=None, new=None, old=None,
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                 ret=None):
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        self.partid = partid
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        self.namespace = namespace
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        self.key = key
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        self.new = new
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        self.old = old
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        self.ret = ret
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        # no i18n expected to be processed into a better message
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        Abort.__init__(self, 'failed to update value for "%s/%s"'
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                       % (namespace, key))
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class CensoredNodeError(RevlogError):
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    """error raised when content verification fails on a censored node
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    Also contains the tombstone data substituted for the uncensored data.
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   206
    """
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   207
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    def __init__(self, filename, node, tombstone):
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        from .node import short
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        RevlogError.__init__(self, '%s:%s' % (filename, short(node)))
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   211
        self.tombstone = tombstone
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   212
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class CensoredBaseError(RevlogError):
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    """error raised when a delta is rejected because its base is censored
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   215
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   216
    A delta based on a censored revision must be formed as single patch
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   217
    operation which replaces the entire base with new content. This ensures
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   218
    the delta may be applied by clones which have not censored the base.
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   219
    """
26640
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   220
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   221
class InvalidBundleSpecification(Exception):
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    """error raised when a bundle specification is invalid.
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   223
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   224
    This is used for syntax errors as opposed to support errors.
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   225
    """
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   226
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   227
class UnsupportedBundleSpecification(Exception):
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   228
    """error raised when a bundle specification is not supported."""