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# upgrade.py - functions for in place upgrade of Mercurial repository
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#
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# Copyright (c) 2016-present, Gregory Szorc
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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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from __future__ import absolute_import
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from ..i18n import _
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from .. import (
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error,
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localrepo,
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requirements,
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util,
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)
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from ..utils import compression
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# list of requirements that request a clone of all revlog if added/removed
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RECLONES_REQUIREMENTS = {
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b'generaldelta',
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requirements.SPARSEREVLOG_REQUIREMENT,
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}
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def preservedrequirements(repo):
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return set()
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FORMAT_VARIANT = b'deficiency'
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OPTIMISATION = b'optimization'
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class improvement(object):
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"""Represents an improvement that can be made as part of an upgrade.
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The following attributes are defined on each instance:
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name
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Machine-readable string uniquely identifying this improvement. It
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will be mapped to an action later in the upgrade process.
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type
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Either ``FORMAT_VARIANT`` or ``OPTIMISATION``.
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A format variant is where we change the storage format. Not all format
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variant changes are an obvious problem.
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An optimization is an action (sometimes optional) that
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can be taken to further improve the state of the repository.
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description
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Message intended for humans explaining the improvement in more detail,
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including the implications of it. For ``FORMAT_VARIANT`` types, should be
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worded in the present tense. For ``OPTIMISATION`` types, should be
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worded in the future tense.
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upgrademessage
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Message intended for humans explaining what an upgrade addressing this
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issue will do. Should be worded in the future tense.
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postupgrademessage
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Message intended for humans which will be shown post an upgrade
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operation when the improvement will be added
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postdowngrademessage
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Message intended for humans which will be shown post an upgrade
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operation in which this improvement was removed
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"""
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def __init__(self, name, type, description, upgrademessage):
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self.name = name
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self.type = type
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self.description = description
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self.upgrademessage = upgrademessage
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self.postupgrademessage = None
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self.postdowngrademessage = None
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def __eq__(self, other):
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if not isinstance(other, improvement):
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# This is what python tell use to do
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return NotImplemented
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return self.name == other.name
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def __ne__(self, other):
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return not (self == other)
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def __hash__(self):
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return hash(self.name)
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allformatvariant = []
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def registerformatvariant(cls):
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allformatvariant.append(cls)
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return cls
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class formatvariant(improvement):
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"""an improvement subclass dedicated to repository format"""
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type = FORMAT_VARIANT
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### The following attributes should be defined for each class:
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# machine-readable string uniquely identifying this improvement. it will be
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# mapped to an action later in the upgrade process.
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name = None
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# message intended for humans explaining the improvement in more detail,
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# including the implications of it ``FORMAT_VARIANT`` types, should be
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# worded
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# in the present tense.
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description = None
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# message intended for humans explaining what an upgrade addressing this
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# issue will do. should be worded in the future tense.
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upgrademessage = None
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# value of current Mercurial default for new repository
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default = None
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# Message intended for humans which will be shown post an upgrade
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# operation when the improvement will be added
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postupgrademessage = None
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# Message intended for humans which will be shown post an upgrade
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# operation in which this improvement was removed
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postdowngrademessage = None
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def __init__(self):
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raise NotImplementedError()
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@staticmethod
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def fromrepo(repo):
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"""current value of the variant in the repository"""
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raise NotImplementedError()
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@staticmethod
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def fromconfig(repo):
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"""current value of the variant in the configuration"""
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raise NotImplementedError()
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class requirementformatvariant(formatvariant):
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"""formatvariant based on a 'requirement' name.
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Many format variant are controlled by a 'requirement'. We define a small
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subclass to factor the code.
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"""
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# the requirement that control this format variant
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_requirement = None
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@staticmethod
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def _newreporequirements(ui):
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return localrepo.newreporequirements(
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ui, localrepo.defaultcreateopts(ui)
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)
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@classmethod
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def fromrepo(cls, repo):
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assert cls._requirement is not None
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return cls._requirement in repo.requirements
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@classmethod
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def fromconfig(cls, repo):
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assert cls._requirement is not None
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return cls._requirement in cls._newreporequirements(repo.ui)
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@registerformatvariant
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class fncache(requirementformatvariant):
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name = b'fncache'
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_requirement = b'fncache'
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default = True
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description = _(
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b'long and reserved filenames may not work correctly; '
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b'repository performance is sub-optimal'
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)
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upgrademessage = _(
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b'repository will be more resilient to storing '
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b'certain paths and performance of certain '
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b'operations should be improved'
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)
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@registerformatvariant
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class dotencode(requirementformatvariant):
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name = b'dotencode'
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_requirement = b'dotencode'
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default = True
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description = _(
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b'storage of filenames beginning with a period or '
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b'space may not work correctly'
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)
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upgrademessage = _(
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b'repository will be better able to store files '
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b'beginning with a space or period'
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)
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@registerformatvariant
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class generaldelta(requirementformatvariant):
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name = b'generaldelta'
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_requirement = b'generaldelta'
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default = True
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description = _(
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b'deltas within internal storage are unable to '
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b'choose optimal revisions; repository is larger and '
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b'slower than it could be; interaction with other '
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b'repositories may require extra network and CPU '
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b'resources, making "hg push" and "hg pull" slower'
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)
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upgrademessage = _(
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b'repository storage will be able to create '
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b'optimal deltas; new repository data will be '
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b'smaller and read times should decrease; '
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b'interacting with other repositories using this '
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b'storage model should require less network and '
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b'CPU resources, making "hg push" and "hg pull" '
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b'faster'
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)
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@registerformatvariant
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class sharesafe(requirementformatvariant):
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name = b'exp-sharesafe'
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_requirement = requirements.SHARESAFE_REQUIREMENT
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default = False
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description = _(
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b'old shared repositories do not share source repository '
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b'requirements and config. This leads to various problems '
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b'when the source repository format is upgraded or some new '
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b'extensions are enabled.'
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)
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upgrademessage = _(
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b'Upgrades a repository to share-safe format so that future '
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b'shares of this repository share its requirements and configs.'
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)
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postdowngrademessage = _(
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b'repository downgraded to not use share safe mode, '
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b'existing shares will not work and needs to'
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b' be reshared.'
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)
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postupgrademessage = _(
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b'repository upgraded to share safe mode, existing'
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b' shares will still work in old non-safe mode. '
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b'Re-share existing shares to use them in safe mode'
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b' New shares will be created in safe mode.'
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)
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@registerformatvariant
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class sparserevlog(requirementformatvariant):
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name = b'sparserevlog'
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_requirement = requirements.SPARSEREVLOG_REQUIREMENT
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default = True
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description = _(
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b'in order to limit disk reading and memory usage on older '
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b'version, the span of a delta chain from its root to its '
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b'end is limited, whatever the relevant data in this span. '
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b'This can severly limit Mercurial ability to build good '
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b'chain of delta resulting is much more storage space being '
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b'taken and limit reusability of on disk delta during '
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b'exchange.'
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)
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upgrademessage = _(
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b'Revlog supports delta chain with more unused data '
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b'between payload. These gaps will be skipped at read '
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b'time. This allows for better delta chains, making a '
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b'better compression and faster exchange with server.'
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)
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@registerformatvariant
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class sidedata(requirementformatvariant):
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name = b'sidedata'
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_requirement = requirements.SIDEDATA_REQUIREMENT
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default = False
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description = _(
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b'Allows storage of extra data alongside a revision, '
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b'unlocking various caching options.'
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)
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upgrademessage = _(b'Allows storage of extra data alongside a revision.')
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@registerformatvariant
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class persistentnodemap(requirementformatvariant):
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name = b'persistent-nodemap'
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_requirement = requirements.NODEMAP_REQUIREMENT
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default = False
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description = _(
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b'persist the node -> rev mapping on disk to speedup lookup'
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)
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upgrademessage = _(b'Speedup revision lookup by node id.')
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@registerformatvariant
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class copiessdc(requirementformatvariant):
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name = b'copies-sdc'
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_requirement = requirements.COPIESSDC_REQUIREMENT
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default = False
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description = _(b'Stores copies information alongside changesets.')
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upgrademessage = _(
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b'Allows to use more efficient algorithm to deal with ' b'copy tracing.'
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)
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@registerformatvariant
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class removecldeltachain(formatvariant):
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name = b'plain-cl-delta'
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default = True
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description = _(
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b'changelog storage is using deltas instead of '
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b'raw entries; changelog reading and any '
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b'operation relying on changelog data are slower '
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b'than they could be'
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)
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upgrademessage = _(
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b'changelog storage will be reformated to '
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b'store raw entries; changelog reading will be '
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b'faster; changelog size may be reduced'
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)
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@staticmethod
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def fromrepo(repo):
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# Mercurial 4.0 changed changelogs to not use delta chains. Search for
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# changelogs with deltas.
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cl = repo.changelog
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chainbase = cl.chainbase
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return all(rev == chainbase(rev) for rev in cl)
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@staticmethod
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def fromconfig(repo):
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return True
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@registerformatvariant
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class compressionengine(formatvariant):
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name = b'compression'
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default = b'zlib'
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description = _(
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b'Compresion algorithm used to compress data. '
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b'Some engine are faster than other'
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)
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upgrademessage = _(
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b'revlog content will be recompressed with the new algorithm.'
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)
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@classmethod
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def fromrepo(cls, repo):
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# we allow multiple compression engine requirement to co-exist because
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# strickly speaking, revlog seems to support mixed compression style.
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#
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# The compression used for new entries will be "the last one"
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compression = b'zlib'
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for req in repo.requirements:
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prefix = req.startswith
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if prefix(b'revlog-compression-') or prefix(b'exp-compression-'):
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compression = req.split(b'-', 2)[2]
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return compression
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@classmethod
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def fromconfig(cls, repo):
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compengines = repo.ui.configlist(b'format', b'revlog-compression')
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# return the first valid value as the selection code would do
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for comp in compengines:
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if comp in util.compengines:
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return comp
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# no valide compression found lets display it all for clarity
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return b','.join(compengines)
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@registerformatvariant
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class compressionlevel(formatvariant):
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name = b'compression-level'
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default = b'default'
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description = _(b'compression level')
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upgrademessage = _(b'revlog content will be recompressed')
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@classmethod
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def fromrepo(cls, repo):
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comp = compressionengine.fromrepo(repo)
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level = None
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if comp == b'zlib':
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level = repo.ui.configint(b'storage', b'revlog.zlib.level')
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elif comp == b'zstd':
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level = repo.ui.configint(b'storage', b'revlog.zstd.level')
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if level is None:
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return b'default'
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return bytes(level)
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@classmethod
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def fromconfig(cls, repo):
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comp = compressionengine.fromconfig(repo)
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level = None
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if comp == b'zlib':
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level = repo.ui.configint(b'storage', b'revlog.zlib.level')
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elif comp == b'zstd':
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level = repo.ui.configint(b'storage', b'revlog.zstd.level')
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if level is None:
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return b'default'
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return bytes(level)
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def find_format_upgrades(repo):
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"""returns a list of format upgrades which can be perform on the repo"""
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upgrades = []
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# We could detect lack of revlogv1 and store here, but they were added
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# in 0.9.2 and we don't support upgrading repos without these
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# requirements, so let's not bother.
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for fv in allformatvariant:
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if not fv.fromrepo(repo):
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upgrades.append(fv)
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return upgrades
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def find_format_downgrades(repo):
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"""returns a list of format downgrades which will be performed on the repo
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because of disabled config option for them"""
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downgrades = []
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for fv in allformatvariant:
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# format variant exist in repo but does not exist in new repository
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# config
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if fv.fromrepo(repo) and not fv.fromconfig(repo):
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downgrades.append(fv)
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return downgrades
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ALL_OPTIMISATIONS = []
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def register_optimization(obj):
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ALL_OPTIMISATIONS.append(obj)
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return obj
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register_optimization(
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improvement(
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name=b're-delta-parent',
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type=OPTIMISATION,
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description=_(
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b'deltas within internal storage will be recalculated to '
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b'choose an optimal base revision where this was not '
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b'already done; the size of the repository may shrink and '
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|
|
b'various operations may become faster; the first time '
|
|
|
b'this optimization is performed could slow down upgrade '
|
|
|
b'execution considerably; subsequent invocations should '
|
|
|
b'not run noticeably slower'
|
|
|
),
|
|
|
upgrademessage=_(
|
|
|
b'deltas within internal storage will choose a new '
|
|
|
b'base revision if needed'
|
|
|
),
|
|
|
)
|
|
|
)
|
|
|
|
|
|
register_optimization(
|
|
|
improvement(
|
|
|
name=b're-delta-multibase',
|
|
|
type=OPTIMISATION,
|
|
|
description=_(
|
|
|
b'deltas within internal storage will be recalculated '
|
|
|
b'against multiple base revision and the smallest '
|
|
|
b'difference will be used; the size of the repository may '
|
|
|
b'shrink significantly when there are many merges; this '
|
|
|
b'optimization will slow down execution in proportion to '
|
|
|
b'the number of merges in the repository and the amount '
|
|
|
b'of files in the repository; this slow down should not '
|
|
|
b'be significant unless there are tens of thousands of '
|
|
|
b'files and thousands of merges'
|
|
|
),
|
|
|
upgrademessage=_(
|
|
|
b'deltas within internal storage will choose an '
|
|
|
b'optimal delta by computing deltas against multiple '
|
|
|
b'parents; may slow down execution time '
|
|
|
b'significantly'
|
|
|
),
|
|
|
)
|
|
|
)
|
|
|
|
|
|
register_optimization(
|
|
|
improvement(
|
|
|
name=b're-delta-all',
|
|
|
type=OPTIMISATION,
|
|
|
description=_(
|
|
|
b'deltas within internal storage will always be '
|
|
|
b'recalculated without reusing prior deltas; this will '
|
|
|
b'likely make execution run several times slower; this '
|
|
|
b'optimization is typically not needed'
|
|
|
),
|
|
|
upgrademessage=_(
|
|
|
b'deltas within internal storage will be fully '
|
|
|
b'recomputed; this will likely drastically slow down '
|
|
|
b'execution time'
|
|
|
),
|
|
|
)
|
|
|
)
|
|
|
|
|
|
register_optimization(
|
|
|
improvement(
|
|
|
name=b're-delta-fulladd',
|
|
|
type=OPTIMISATION,
|
|
|
description=_(
|
|
|
b'every revision will be re-added as if it was new '
|
|
|
b'content. It will go through the full storage '
|
|
|
b'mechanism giving extensions a chance to process it '
|
|
|
b'(eg. lfs). This is similar to "re-delta-all" but even '
|
|
|
b'slower since more logic is involved.'
|
|
|
),
|
|
|
upgrademessage=_(
|
|
|
b'each revision will be added as new content to the '
|
|
|
b'internal storage; this will likely drastically slow '
|
|
|
b'down execution time, but some extensions might need '
|
|
|
b'it'
|
|
|
),
|
|
|
)
|
|
|
)
|
|
|
|
|
|
|
|
|
def findoptimizations(repo):
|
|
|
"""Determine optimisation that could be used during upgrade"""
|
|
|
# These are unconditionally added. There is logic later that figures out
|
|
|
# which ones to apply.
|
|
|
return list(ALL_OPTIMISATIONS)
|
|
|
|
|
|
|
|
|
def determine_upgrade_actions(
|
|
|
repo, format_upgrades, optimizations, sourcereqs, destreqs
|
|
|
):
|
|
|
"""Determine upgrade actions that will be performed.
|
|
|
|
|
|
Given a list of improvements as returned by ``find_format_upgrades`` and
|
|
|
``findoptimizations``, determine the list of upgrade actions that
|
|
|
will be performed.
|
|
|
|
|
|
The role of this function is to filter improvements if needed, apply
|
|
|
recommended optimizations from the improvements list that make sense,
|
|
|
etc.
|
|
|
|
|
|
Returns a list of action names.
|
|
|
"""
|
|
|
newactions = []
|
|
|
|
|
|
for d in format_upgrades:
|
|
|
name = d._requirement
|
|
|
|
|
|
# If the action is a requirement that doesn't show up in the
|
|
|
# destination requirements, prune the action.
|
|
|
if name is not None and name not in destreqs:
|
|
|
continue
|
|
|
|
|
|
newactions.append(d)
|
|
|
|
|
|
newactions.extend(o for o in sorted(optimizations) if o not in newactions)
|
|
|
|
|
|
# FUTURE consider adding some optimizations here for certain transitions.
|
|
|
# e.g. adding generaldelta could schedule parent redeltas.
|
|
|
|
|
|
return newactions
|
|
|
|
|
|
|
|
|
class UpgradeOperation(object):
|
|
|
"""represent the work to be done during an upgrade"""
|
|
|
|
|
|
def __init__(
|
|
|
self,
|
|
|
ui,
|
|
|
new_requirements,
|
|
|
current_requirements,
|
|
|
upgrade_actions,
|
|
|
removed_actions,
|
|
|
revlogs_to_process,
|
|
|
):
|
|
|
self.ui = ui
|
|
|
self.new_requirements = new_requirements
|
|
|
self.current_requirements = current_requirements
|
|
|
# list of upgrade actions the operation will perform
|
|
|
self.upgrade_actions = upgrade_actions
|
|
|
self._upgrade_actions_names = set([a.name for a in upgrade_actions])
|
|
|
self.removed_actions = removed_actions
|
|
|
self.revlogs_to_process = revlogs_to_process
|
|
|
# requirements which will be added by the operation
|
|
|
self._added_requirements = (
|
|
|
self.new_requirements - self.current_requirements
|
|
|
)
|
|
|
# requirements which will be removed by the operation
|
|
|
self._removed_requirements = (
|
|
|
self.current_requirements - self.new_requirements
|
|
|
)
|
|
|
# requirements which will be preserved by the operation
|
|
|
self._preserved_requirements = (
|
|
|
self.current_requirements & self.new_requirements
|
|
|
)
|
|
|
# optimizations which are not used and it's recommended that they
|
|
|
# should use them
|
|
|
all_optimizations = findoptimizations(None)
|
|
|
self.unused_optimizations = [
|
|
|
i for i in all_optimizations if i not in self.upgrade_actions
|
|
|
]
|
|
|
|
|
|
def _write_labeled(self, l, label):
|
|
|
"""
|
|
|
Utility function to aid writing of a list under one label
|
|
|
"""
|
|
|
first = True
|
|
|
for r in sorted(l):
|
|
|
if not first:
|
|
|
self.ui.write(b', ')
|
|
|
self.ui.write(r, label=label)
|
|
|
first = False
|
|
|
|
|
|
def print_requirements(self):
|
|
|
self.ui.write(_(b'requirements\n'))
|
|
|
self.ui.write(_(b' preserved: '))
|
|
|
self._write_labeled(
|
|
|
self._preserved_requirements, "upgrade-repo.requirement.preserved"
|
|
|
)
|
|
|
self.ui.write((b'\n'))
|
|
|
if self._removed_requirements:
|
|
|
self.ui.write(_(b' removed: '))
|
|
|
self._write_labeled(
|
|
|
self._removed_requirements, "upgrade-repo.requirement.removed"
|
|
|
)
|
|
|
self.ui.write((b'\n'))
|
|
|
if self._added_requirements:
|
|
|
self.ui.write(_(b' added: '))
|
|
|
self._write_labeled(
|
|
|
self._added_requirements, "upgrade-repo.requirement.added"
|
|
|
)
|
|
|
self.ui.write((b'\n'))
|
|
|
self.ui.write(b'\n')
|
|
|
|
|
|
def print_optimisations(self):
|
|
|
optimisations = [
|
|
|
a for a in self.upgrade_actions if a.type == OPTIMISATION
|
|
|
]
|
|
|
optimisations.sort(key=lambda a: a.name)
|
|
|
if optimisations:
|
|
|
self.ui.write(_(b'optimisations: '))
|
|
|
self._write_labeled(
|
|
|
[a.name for a in optimisations],
|
|
|
"upgrade-repo.optimisation.performed",
|
|
|
)
|
|
|
self.ui.write(b'\n\n')
|
|
|
|
|
|
def print_upgrade_actions(self):
|
|
|
for a in self.upgrade_actions:
|
|
|
self.ui.status(b'%s\n %s\n\n' % (a.name, a.upgrademessage))
|
|
|
|
|
|
def print_affected_revlogs(self):
|
|
|
if not self.revlogs_to_process:
|
|
|
self.ui.write((b'no revlogs to process\n'))
|
|
|
else:
|
|
|
self.ui.write((b'processed revlogs:\n'))
|
|
|
for r in sorted(self.revlogs_to_process):
|
|
|
self.ui.write((b' - %s\n' % r))
|
|
|
self.ui.write((b'\n'))
|
|
|
|
|
|
def print_unused_optimizations(self):
|
|
|
for i in self.unused_optimizations:
|
|
|
self.ui.status(_(b'%s\n %s\n\n') % (i.name, i.description))
|
|
|
|
|
|
def has_upgrade_action(self, name):
|
|
|
""" Check whether the upgrade operation will perform this action """
|
|
|
return name in self._upgrade_actions_names
|
|
|
|
|
|
def print_post_op_messages(self):
|
|
|
""" print post upgrade operation warning messages """
|
|
|
for a in self.upgrade_actions:
|
|
|
if a.postupgrademessage is not None:
|
|
|
self.ui.warn(b'%s\n' % a.postupgrademessage)
|
|
|
for a in self.removed_actions:
|
|
|
if a.postdowngrademessage is not None:
|
|
|
self.ui.warn(b'%s\n' % a.postdowngrademessage)
|
|
|
|
|
|
|
|
|
### Code checking if a repository can got through the upgrade process at all. #
|
|
|
|
|
|
|
|
|
def requiredsourcerequirements(repo):
|
|
|
"""Obtain requirements required to be present to upgrade a repo.
|
|
|
|
|
|
An upgrade will not be allowed if the repository doesn't have the
|
|
|
requirements returned by this function.
|
|
|
"""
|
|
|
return {
|
|
|
# Introduced in Mercurial 0.9.2.
|
|
|
b'revlogv1',
|
|
|
# Introduced in Mercurial 0.9.2.
|
|
|
b'store',
|
|
|
}
|
|
|
|
|
|
|
|
|
def blocksourcerequirements(repo):
|
|
|
"""Obtain requirements that will prevent an upgrade from occurring.
|
|
|
|
|
|
An upgrade cannot be performed if the source repository contains a
|
|
|
requirements in the returned set.
|
|
|
"""
|
|
|
return {
|
|
|
# The upgrade code does not yet support these experimental features.
|
|
|
# This is an artificial limitation.
|
|
|
requirements.TREEMANIFEST_REQUIREMENT,
|
|
|
# This was a precursor to generaldelta and was never enabled by default.
|
|
|
# It should (hopefully) not exist in the wild.
|
|
|
b'parentdelta',
|
|
|
# Upgrade should operate on the actual store, not the shared link.
|
|
|
requirements.SHARED_REQUIREMENT,
|
|
|
}
|
|
|
|
|
|
|
|
|
def check_source_requirements(repo):
|
|
|
"""Ensure that no existing requirements prevent the repository upgrade"""
|
|
|
|
|
|
required = requiredsourcerequirements(repo)
|
|
|
missingreqs = required - repo.requirements
|
|
|
if missingreqs:
|
|
|
msg = _(b'cannot upgrade repository; requirement missing: %s')
|
|
|
missingreqs = b', '.join(sorted(missingreqs))
|
|
|
raise error.Abort(msg % missingreqs)
|
|
|
|
|
|
blocking = blocksourcerequirements(repo)
|
|
|
blockingreqs = blocking & repo.requirements
|
|
|
if blockingreqs:
|
|
|
m = _(b'cannot upgrade repository; unsupported source requirement: %s')
|
|
|
blockingreqs = b', '.join(sorted(blockingreqs))
|
|
|
raise error.Abort(m % blockingreqs)
|
|
|
|
|
|
|
|
|
### Verify the validity of the planned requirement changes ####################
|
|
|
|
|
|
|
|
|
def supportremovedrequirements(repo):
|
|
|
"""Obtain requirements that can be removed during an upgrade.
|
|
|
|
|
|
If an upgrade were to create a repository that dropped a requirement,
|
|
|
the dropped requirement must appear in the returned set for the upgrade
|
|
|
to be allowed.
|
|
|
"""
|
|
|
supported = {
|
|
|
requirements.SPARSEREVLOG_REQUIREMENT,
|
|
|
requirements.SIDEDATA_REQUIREMENT,
|
|
|
requirements.COPIESSDC_REQUIREMENT,
|
|
|
requirements.NODEMAP_REQUIREMENT,
|
|
|
requirements.SHARESAFE_REQUIREMENT,
|
|
|
}
|
|
|
for name in compression.compengines:
|
|
|
engine = compression.compengines[name]
|
|
|
if engine.available() and engine.revlogheader():
|
|
|
supported.add(b'exp-compression-%s' % name)
|
|
|
if engine.name() == b'zstd':
|
|
|
supported.add(b'revlog-compression-zstd')
|
|
|
return supported
|
|
|
|
|
|
|
|
|
def supporteddestrequirements(repo):
|
|
|
"""Obtain requirements that upgrade supports in the destination.
|
|
|
|
|
|
If the result of the upgrade would create requirements not in this set,
|
|
|
the upgrade is disallowed.
|
|
|
|
|
|
Extensions should monkeypatch this to add their custom requirements.
|
|
|
"""
|
|
|
supported = {
|
|
|
b'dotencode',
|
|
|
b'fncache',
|
|
|
b'generaldelta',
|
|
|
b'revlogv1',
|
|
|
b'store',
|
|
|
requirements.SPARSEREVLOG_REQUIREMENT,
|
|
|
requirements.SIDEDATA_REQUIREMENT,
|
|
|
requirements.COPIESSDC_REQUIREMENT,
|
|
|
requirements.NODEMAP_REQUIREMENT,
|
|
|
requirements.SHARESAFE_REQUIREMENT,
|
|
|
}
|
|
|
for name in compression.compengines:
|
|
|
engine = compression.compengines[name]
|
|
|
if engine.available() and engine.revlogheader():
|
|
|
supported.add(b'exp-compression-%s' % name)
|
|
|
if engine.name() == b'zstd':
|
|
|
supported.add(b'revlog-compression-zstd')
|
|
|
return supported
|
|
|
|
|
|
|
|
|
def allowednewrequirements(repo):
|
|
|
"""Obtain requirements that can be added to a repository during upgrade.
|
|
|
|
|
|
This is used to disallow proposed requirements from being added when
|
|
|
they weren't present before.
|
|
|
|
|
|
We use a list of allowed requirement additions instead of a list of known
|
|
|
bad additions because the whitelist approach is safer and will prevent
|
|
|
future, unknown requirements from accidentally being added.
|
|
|
"""
|
|
|
supported = {
|
|
|
b'dotencode',
|
|
|
b'fncache',
|
|
|
b'generaldelta',
|
|
|
requirements.SPARSEREVLOG_REQUIREMENT,
|
|
|
requirements.SIDEDATA_REQUIREMENT,
|
|
|
requirements.COPIESSDC_REQUIREMENT,
|
|
|
requirements.NODEMAP_REQUIREMENT,
|
|
|
requirements.SHARESAFE_REQUIREMENT,
|
|
|
}
|
|
|
for name in compression.compengines:
|
|
|
engine = compression.compengines[name]
|
|
|
if engine.available() and engine.revlogheader():
|
|
|
supported.add(b'exp-compression-%s' % name)
|
|
|
if engine.name() == b'zstd':
|
|
|
supported.add(b'revlog-compression-zstd')
|
|
|
return supported
|
|
|
|
|
|
|
|
|
def check_requirements_changes(repo, new_reqs):
|
|
|
old_reqs = repo.requirements
|
|
|
|
|
|
support_removal = supportremovedrequirements(repo)
|
|
|
no_remove_reqs = old_reqs - new_reqs - support_removal
|
|
|
if no_remove_reqs:
|
|
|
msg = _(b'cannot upgrade repository; requirement would be removed: %s')
|
|
|
no_remove_reqs = b', '.join(sorted(no_remove_reqs))
|
|
|
raise error.Abort(msg % no_remove_reqs)
|
|
|
|
|
|
support_addition = allowednewrequirements(repo)
|
|
|
no_add_reqs = new_reqs - old_reqs - support_addition
|
|
|
if no_add_reqs:
|
|
|
m = _(b'cannot upgrade repository; do not support adding requirement: ')
|
|
|
no_add_reqs = b', '.join(sorted(no_add_reqs))
|
|
|
raise error.Abort(m + no_add_reqs)
|
|
|
|
|
|
supported = supporteddestrequirements(repo)
|
|
|
unsupported_reqs = new_reqs - supported
|
|
|
if unsupported_reqs:
|
|
|
msg = _(
|
|
|
b'cannot upgrade repository; do not support destination '
|
|
|
b'requirement: %s'
|
|
|
)
|
|
|
unsupported_reqs = b', '.join(sorted(unsupported_reqs))
|
|
|
raise error.Abort(msg % unsupported_reqs)
|
|
|
|
