narrow: support debugupgraderepo

Differential Revision: https://phab.mercurial-scm.org/D12542

mercurial/upgrade_utils/actions.py

@@ -1,1095 +1,1096 b''
 # upgrade.py - functions for in place upgrade of Mercurial repository
 #
 # Copyright (c) 2016-present, Gregory Szorc
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 
 from ..i18n import _
 from .. import (
     error,
     localrepo,
     pycompat,
     requirements,
     revlog,
     util,
 )
 
 from ..utils import compression
 
 if pycompat.TYPE_CHECKING:
     from typing import (
         List,
         Type,
     )
 
 
 # list of requirements that request a clone of all revlog if added/removed
 RECLONES_REQUIREMENTS = {
     requirements.GENERALDELTA_REQUIREMENT,
     requirements.SPARSEREVLOG_REQUIREMENT,
     requirements.REVLOGV2_REQUIREMENT,
     requirements.CHANGELOGV2_REQUIREMENT,
 }
 
-
 def preservedrequirements(repo):
     preserved = {
         requirements.SHARED_REQUIREMENT,
+        requirements.NARROW_REQUIREMENT,
     }
     return preserved & repo.requirements
 
 
 FORMAT_VARIANT = b'deficiency'
 OPTIMISATION = b'optimization'
 
 
 class improvement:
     """Represents an improvement that can be made as part of an upgrade."""
 
     ### The following attributes should be defined for each subclass:
 
     # Either ``FORMAT_VARIANT`` or ``OPTIMISATION``.
     # A format variant is where we change the storage format. Not all format
     # variant changes are an obvious problem.
     # An optimization is an action (sometimes optional) that
     # can be taken to further improve the state of the repository.
     type = None
 
     # machine-readable string uniquely identifying this improvement. it will be
     # mapped to an action later in the upgrade process.
     name = None
 
     # message intended for humans explaining the improvement in more detail,
     # including the implications of it ``FORMAT_VARIANT`` types, should be
     # worded
     # in the present tense.
     description = None
 
     # message intended for humans explaining what an upgrade addressing this
     # issue will do. should be worded in the future tense.
     upgrademessage = None
 
     # value of current Mercurial default for new repository
     default = None
 
     # Message intended for humans which will be shown post an upgrade
     # operation when the improvement will be added
     postupgrademessage = None
 
     # Message intended for humans which will be shown post an upgrade
     # operation in which this improvement was removed
     postdowngrademessage = None
 
     # By default we assume that every improvement touches requirements and all revlogs
 
     # Whether this improvement touches filelogs
     touches_filelogs = True
 
     # Whether this improvement touches manifests
     touches_manifests = True
 
     # Whether this improvement touches changelog
     touches_changelog = True
 
     # Whether this improvement changes repository requirements
     touches_requirements = True
 
     # Whether this improvement touches the dirstate
     touches_dirstate = False
 
     # Can this action be run on a share instead of its mains repository
     compatible_with_share = False
 
 
 allformatvariant = []  # type: List[Type['formatvariant']]
 
 
 def registerformatvariant(cls):
     allformatvariant.append(cls)
     return cls
 
 
 class formatvariant(improvement):
     """an improvement subclass dedicated to repository format"""
 
     type = FORMAT_VARIANT
 
     @staticmethod
     def fromrepo(repo):
         """current value of the variant in the repository"""
         raise NotImplementedError()
 
     @staticmethod
     def fromconfig(repo):
         """current value of the variant in the configuration"""
         raise NotImplementedError()
 
 
 class requirementformatvariant(formatvariant):
     """formatvariant based on a 'requirement' name.
 
     Many format variant are controlled by a 'requirement'. We define a small
     subclass to factor the code.
     """
 
     # the requirement that control this format variant
     _requirement = None
 
     @staticmethod
     def _newreporequirements(ui):
         return localrepo.newreporequirements(
             ui, localrepo.defaultcreateopts(ui)
         )
 
     @classmethod
     def fromrepo(cls, repo):
         assert cls._requirement is not None
         return cls._requirement in repo.requirements
 
     @classmethod
     def fromconfig(cls, repo):
         assert cls._requirement is not None
         return cls._requirement in cls._newreporequirements(repo.ui)
 
 
 @registerformatvariant
 class fncache(requirementformatvariant):
     name = b'fncache'
 
     _requirement = requirements.FNCACHE_REQUIREMENT
 
     default = True
 
     description = _(
         b'long and reserved filenames may not work correctly; '
         b'repository performance is sub-optimal'
     )
 
     upgrademessage = _(
         b'repository will be more resilient to storing '
         b'certain paths and performance of certain '
         b'operations should be improved'
     )
 
 
 @registerformatvariant
 class dirstatev2(requirementformatvariant):
     name = b'dirstate-v2'
     _requirement = requirements.DIRSTATE_V2_REQUIREMENT
 
     default = False
 
     description = _(
         b'version 1 of the dirstate file format requires '
         b'reading and parsing it all at once.\n'
         b'Version 2 has a better structure,'
         b'better information and lighter update mechanism'
     )
 
     upgrademessage = _(b'"hg status" will be faster')
 
     touches_filelogs = False
     touches_manifests = False
     touches_changelog = False
     touches_requirements = True
     touches_dirstate = True
     compatible_with_share = True
 
 
 @registerformatvariant
 class dirstatetrackedkey(requirementformatvariant):
     name = b'tracked-hint'
     _requirement = requirements.DIRSTATE_TRACKED_HINT_V1
 
     default = False
 
     description = _(
         b'Add a small file to help external tooling that watch the tracked set'
     )
 
     upgrademessage = _(
         b'external tools will be informated of potential change in the tracked set'
     )
 
     touches_filelogs = False
     touches_manifests = False
     touches_changelog = False
     touches_requirements = True
     touches_dirstate = True
     compatible_with_share = True
 
 
 @registerformatvariant
 class dotencode(requirementformatvariant):
     name = b'dotencode'
 
     _requirement = requirements.DOTENCODE_REQUIREMENT
 
     default = True
 
     description = _(
         b'storage of filenames beginning with a period or '
         b'space may not work correctly'
     )
 
     upgrademessage = _(
         b'repository will be better able to store files '
         b'beginning with a space or period'
     )
 
 
 @registerformatvariant
 class generaldelta(requirementformatvariant):
     name = b'generaldelta'
 
     _requirement = requirements.GENERALDELTA_REQUIREMENT
 
     default = True
 
     description = _(
         b'deltas within internal storage are unable to '
         b'choose optimal revisions; repository is larger and '
         b'slower than it could be; interaction with other '
         b'repositories may require extra network and CPU '
         b'resources, making "hg push" and "hg pull" slower'
     )
 
     upgrademessage = _(
         b'repository storage will be able to create '
         b'optimal deltas; new repository data will be '
         b'smaller and read times should decrease; '
         b'interacting with other repositories using this '
         b'storage model should require less network and '
         b'CPU resources, making "hg push" and "hg pull" '
         b'faster'
     )
 
 
 @registerformatvariant
 class sharesafe(requirementformatvariant):
     name = b'share-safe'
     _requirement = requirements.SHARESAFE_REQUIREMENT
 
     default = True
 
     description = _(
         b'old shared repositories do not share source repository '
         b'requirements and config. This leads to various problems '
         b'when the source repository format is upgraded or some new '
         b'extensions are enabled.'
     )
 
     upgrademessage = _(
         b'Upgrades a repository to share-safe format so that future '
         b'shares of this repository share its requirements and configs.'
     )
 
     postdowngrademessage = _(
         b'repository downgraded to not use share safe mode, '
         b'existing shares will not work and needs to'
         b' be reshared.'
     )
 
     postupgrademessage = _(
         b'repository upgraded to share safe mode, existing'
         b' shares will still work in old non-safe mode. '
         b'Re-share existing shares to use them in safe mode'
         b' New shares will be created in safe mode.'
     )
 
     # upgrade only needs to change the requirements
     touches_filelogs = False
     touches_manifests = False
     touches_changelog = False
     touches_requirements = True
 
 
 @registerformatvariant
 class sparserevlog(requirementformatvariant):
     name = b'sparserevlog'
 
     _requirement = requirements.SPARSEREVLOG_REQUIREMENT
 
     default = True
 
     description = _(
         b'in order to limit disk reading and memory usage on older '
         b'version, the span of a delta chain from its root to its '
         b'end is limited, whatever the relevant data in this span. '
         b'This can severly limit Mercurial ability to build good '
         b'chain of delta resulting is much more storage space being '
         b'taken and limit reusability of on disk delta during '
         b'exchange.'
     )
 
     upgrademessage = _(
         b'Revlog supports delta chain with more unused data '
         b'between payload. These gaps will be skipped at read '
         b'time. This allows for better delta chains, making a '
         b'better compression and faster exchange with server.'
     )
 
 
 @registerformatvariant
 class persistentnodemap(requirementformatvariant):
     name = b'persistent-nodemap'
 
     _requirement = requirements.NODEMAP_REQUIREMENT
 
     default = False
 
     description = _(
         b'persist the node -> rev mapping on disk to speedup lookup'
     )
 
     upgrademessage = _(b'Speedup revision lookup by node id.')
 
 
 @registerformatvariant
 class copiessdc(requirementformatvariant):
     name = b'copies-sdc'
 
     _requirement = requirements.COPIESSDC_REQUIREMENT
 
     default = False
 
     description = _(b'Stores copies information alongside changesets.')
 
     upgrademessage = _(
         b'Allows to use more efficient algorithm to deal with ' b'copy tracing.'
     )
 
 
 @registerformatvariant
 class revlogv2(requirementformatvariant):
     name = b'revlog-v2'
     _requirement = requirements.REVLOGV2_REQUIREMENT
     default = False
     description = _(b'Version 2 of the revlog.')
     upgrademessage = _(b'very experimental')
 
 
 @registerformatvariant
 class changelogv2(requirementformatvariant):
     name = b'changelog-v2'
     _requirement = requirements.CHANGELOGV2_REQUIREMENT
     default = False
     description = _(b'An iteration of the revlog focussed on changelog needs.')
     upgrademessage = _(b'quite experimental')
 
 
 @registerformatvariant
 class removecldeltachain(formatvariant):
     name = b'plain-cl-delta'
 
     default = True
 
     description = _(
         b'changelog storage is using deltas instead of '
         b'raw entries; changelog reading and any '
         b'operation relying on changelog data are slower '
         b'than they could be'
     )
 
     upgrademessage = _(
         b'changelog storage will be reformated to '
         b'store raw entries; changelog reading will be '
         b'faster; changelog size may be reduced'
     )
 
     @staticmethod
     def fromrepo(repo):
         # Mercurial 4.0 changed changelogs to not use delta chains. Search for
         # changelogs with deltas.
         cl = repo.changelog
         chainbase = cl.chainbase
         return all(rev == chainbase(rev) for rev in cl)
 
     @staticmethod
     def fromconfig(repo):
         return True
 
 
 _has_zstd = (
     b'zstd' in util.compengines
     and util.compengines[b'zstd'].available()
     and util.compengines[b'zstd'].revlogheader()
 )
 
 
 @registerformatvariant
 class compressionengine(formatvariant):
     name = b'compression'
 
     if _has_zstd:
         default = b'zstd'
     else:
         default = b'zlib'
 
     description = _(
         b'Compresion algorithm used to compress data. '
         b'Some engine are faster than other'
     )
 
     upgrademessage = _(
         b'revlog content will be recompressed with the new algorithm.'
     )
 
     @classmethod
     def fromrepo(cls, repo):
         # we allow multiple compression engine requirement to co-exist because
         # strickly speaking, revlog seems to support mixed compression style.
         #
         # The compression used for new entries will be "the last one"
         compression = b'zlib'
         for req in repo.requirements:
             prefix = req.startswith
             if prefix(b'revlog-compression-') or prefix(b'exp-compression-'):
                 compression = req.split(b'-', 2)[2]
         return compression
 
     @classmethod
     def fromconfig(cls, repo):
         compengines = repo.ui.configlist(b'format', b'revlog-compression')
         # return the first valid value as the selection code would do
         for comp in compengines:
             if comp in util.compengines:
                 e = util.compengines[comp]
                 if e.available() and e.revlogheader():
                     return comp
 
         # no valide compression found lets display it all for clarity
         return b','.join(compengines)
 
 
 @registerformatvariant
 class compressionlevel(formatvariant):
     name = b'compression-level'
     default = b'default'
 
     description = _(b'compression level')
 
     upgrademessage = _(b'revlog content will be recompressed')
 
     @classmethod
     def fromrepo(cls, repo):
         comp = compressionengine.fromrepo(repo)
         level = None
         if comp == b'zlib':
             level = repo.ui.configint(b'storage', b'revlog.zlib.level')
         elif comp == b'zstd':
             level = repo.ui.configint(b'storage', b'revlog.zstd.level')
         if level is None:
             return b'default'
         return bytes(level)
 
     @classmethod
     def fromconfig(cls, repo):
         comp = compressionengine.fromconfig(repo)
         level = None
         if comp == b'zlib':
             level = repo.ui.configint(b'storage', b'revlog.zlib.level')
         elif comp == b'zstd':
             level = repo.ui.configint(b'storage', b'revlog.zstd.level')
         if level is None:
             return b'default'
         return bytes(level)
 
 
 def find_format_upgrades(repo):
     """returns a list of format upgrades which can be perform on the repo"""
     upgrades = []
 
     # We could detect lack of revlogv1 and store here, but they were added
     # in 0.9.2 and we don't support upgrading repos without these
     # requirements, so let's not bother.
 
     for fv in allformatvariant:
         if not fv.fromrepo(repo):
             upgrades.append(fv)
 
     return upgrades
 
 
 def find_format_downgrades(repo):
     """returns a list of format downgrades which will be performed on the repo
     because of disabled config option for them"""
 
     downgrades = []
 
     for fv in allformatvariant:
         if fv.name == b'compression':
             # If there is a compression change between repository
             # and config, destination repository compression will change
             # and current compression will be removed.
             if fv.fromrepo(repo) != fv.fromconfig(repo):
                 downgrades.append(fv)
             continue
         # format variant exist in repo but does not exist in new repository
         # config
         if fv.fromrepo(repo) and not fv.fromconfig(repo):
             downgrades.append(fv)
 
     return downgrades
 
 
 ALL_OPTIMISATIONS = []
 
 
 def register_optimization(obj):
     ALL_OPTIMISATIONS.append(obj)
     return obj
 
 
 class optimization(improvement):
     """an improvement subclass dedicated to optimizations"""
 
     type = OPTIMISATION
 
 
 @register_optimization
 class redeltaparents(optimization):
     name = b're-delta-parent'
 
     type = OPTIMISATION
 
     description = _(
         b'deltas within internal storage will be recalculated to '
         b'choose an optimal base revision where this was not '
         b'already done; the size of the repository may shrink and '
         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
 class redeltamultibase(optimization):
     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
 class redeltaall(optimization):
     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
 class redeltafulladd(optimization):
     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:
         if util.safehasattr(d, '_requirement'):
             name = d._requirement
         else:
             name = None
 
         # 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:
     """represent the work to be done during an upgrade"""
 
     def __init__(
         self,
         ui,
         new_requirements,
         current_requirements,
         upgrade_actions,
         removed_actions,
         revlogs_to_process,
         backup_store,
     ):
         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.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
         ]
 
         # delta reuse mode of this upgrade operation
         upgrade_actions_names = self.upgrade_actions_names
         self.delta_reuse_mode = revlog.revlog.DELTAREUSEALWAYS
         if b're-delta-all' in upgrade_actions_names:
             self.delta_reuse_mode = revlog.revlog.DELTAREUSENEVER
         elif b're-delta-parent' in upgrade_actions_names:
             self.delta_reuse_mode = revlog.revlog.DELTAREUSESAMEREVS
         elif b're-delta-multibase' in upgrade_actions_names:
             self.delta_reuse_mode = revlog.revlog.DELTAREUSESAMEREVS
         elif b're-delta-fulladd' in upgrade_actions_names:
             self.delta_reuse_mode = revlog.revlog.DELTAREUSEFULLADD
 
         # should this operation force re-delta of both parents
         self.force_re_delta_both_parents = (
             b're-delta-multibase' in upgrade_actions_names
         )
 
         # should this operation create a backup of the store
         self.backup_store = backup_store
 
     @property
     def upgrade_actions_names(self):
         return set([a.name for a in self.upgrade_actions])
 
     @property
     def requirements_only(self):
         # does the operation only touches repository requirement
         return (
             self.touches_requirements
             and not self.touches_filelogs
             and not self.touches_manifests
             and not self.touches_changelog
             and not self.touches_dirstate
         )
 
     @property
     def touches_filelogs(self):
         for a in self.upgrade_actions:
             # in optimisations, we re-process the revlogs again
             if a.type == OPTIMISATION:
                 return True
             elif a.touches_filelogs:
                 return True
         for a in self.removed_actions:
             if a.touches_filelogs:
                 return True
         return False
 
     @property
     def touches_manifests(self):
         for a in self.upgrade_actions:
             # in optimisations, we re-process the revlogs again
             if a.type == OPTIMISATION:
                 return True
             elif a.touches_manifests:
                 return True
         for a in self.removed_actions:
             if a.touches_manifests:
                 return True
         return False
 
     @property
     def touches_changelog(self):
         for a in self.upgrade_actions:
             # in optimisations, we re-process the revlogs again
             if a.type == OPTIMISATION:
                 return True
             elif a.touches_changelog:
                 return True
         for a in self.removed_actions:
             if a.touches_changelog:
                 return True
         return False
 
     @property
     def touches_requirements(self):
         for a in self.upgrade_actions:
             # optimisations are used to re-process revlogs and does not result
             # in a requirement being added or removed
             if a.type == OPTIMISATION:
                 pass
             elif a.touches_requirements:
                 return True
         for a in self.removed_actions:
             if a.touches_requirements:
                 return True
 
     @property
     def touches_dirstate(self):
         for a in self.upgrade_actions:
             # revlog optimisations do not affect the dirstate
             if a.type == OPTIMISATION:
                 pass
             elif a.touches_dirstate:
                 return True
         for a in self.removed_actions:
             if a.touches_dirstate:
                 return True
 
         return False
 
     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.
         requirements.STORE_REQUIREMENT,
     }
 
 
 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',
     }
 
 
 def check_revlog_version(reqs):
     """Check that the requirements contain at least one Revlog version"""
     all_revlogs = {
         requirements.REVLOGV1_REQUIREMENT,
         requirements.REVLOGV2_REQUIREMENT,
     }
     if not all_revlogs.intersection(reqs):
         msg = _(b'cannot upgrade repository; missing a revlog version')
         raise error.Abort(msg)
 
 
 def check_source_requirements(repo):
     """Ensure that no existing requirements prevent the repository upgrade"""
 
     check_revlog_version(repo.requirements)
     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)
     # Upgrade should operate on the actual store, not the shared link.
 
     bad_share = (
         requirements.SHARED_REQUIREMENT in repo.requirements
         and requirements.SHARESAFE_REQUIREMENT not in repo.requirements
     )
     if bad_share:
         m = _(b'cannot upgrade repository; share repository without share-safe')
         h = _(b'check :hg:`help config.format.use-share-safe`')
         raise error.Abort(m, hint=h)
 
 
 ### 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.COPIESSDC_REQUIREMENT,
         requirements.NODEMAP_REQUIREMENT,
         requirements.SHARESAFE_REQUIREMENT,
         requirements.REVLOGV2_REQUIREMENT,
         requirements.CHANGELOGV2_REQUIREMENT,
         requirements.REVLOGV1_REQUIREMENT,
         requirements.DIRSTATE_TRACKED_HINT_V1,
         requirements.DIRSTATE_V2_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,
+    If the result of the upgrade would have requirements not in this set,
     the upgrade is disallowed.
 
     Extensions should monkeypatch this to add their custom requirements.
     """
     supported = {
         requirements.CHANGELOGV2_REQUIREMENT,
         requirements.COPIESSDC_REQUIREMENT,
         requirements.DIRSTATE_TRACKED_HINT_V1,
         requirements.DIRSTATE_V2_REQUIREMENT,
         requirements.DOTENCODE_REQUIREMENT,
         requirements.FNCACHE_REQUIREMENT,
         requirements.GENERALDELTA_REQUIREMENT,
         requirements.NODEMAP_REQUIREMENT,
         requirements.REVLOGV1_REQUIREMENT,  # allowed in case of downgrade
         requirements.REVLOGV2_REQUIREMENT,
         requirements.SHARED_REQUIREMENT,
         requirements.SHARESAFE_REQUIREMENT,
         requirements.SPARSEREVLOG_REQUIREMENT,
         requirements.STORE_REQUIREMENT,
+        requirements.NARROW_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 = {
         requirements.DOTENCODE_REQUIREMENT,
         requirements.FNCACHE_REQUIREMENT,
         requirements.GENERALDELTA_REQUIREMENT,
         requirements.SPARSEREVLOG_REQUIREMENT,
         requirements.COPIESSDC_REQUIREMENT,
         requirements.NODEMAP_REQUIREMENT,
         requirements.SHARESAFE_REQUIREMENT,
         requirements.REVLOGV1_REQUIREMENT,
         requirements.REVLOGV2_REQUIREMENT,
         requirements.CHANGELOGV2_REQUIREMENT,
         requirements.DIRSTATE_TRACKED_HINT_V1,
         requirements.DIRSTATE_V2_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
     check_revlog_version(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)

tests/test-narrow.t

@@ -1,541 +1,552 b''
 #testcases flat tree
 #testcases lfs-on lfs-off
 
   $ cat >> $HGRCPATH << EOF
   > [experimental]
   > evolution=createmarkers
   > EOF
 
 #if lfs-on
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > lfs =
   > EOF
 #endif
 
   $ . "$TESTDIR/narrow-library.sh"
 
 #if tree
   $ cat << EOF >> $HGRCPATH
   > [experimental]
   > treemanifest = 1
   > EOF
 #endif
 
   $ hg init master
   $ cd master
   $ cat >> .hg/hgrc <<EOF
   > [narrow]
   > serveellipses=True
   > EOF
   $ for x in `$TESTDIR/seq.py 0 10`
   > do
   >   mkdir d$x
   >   echo $x > d$x/f
   >   hg add d$x/f
   >   hg commit -m "add d$x/f"
   > done
   $ hg log -T "{rev}: {desc}\n"
   10: add d10/f
   9: add d9/f
   8: add d8/f
   7: add d7/f
   6: add d6/f
   5: add d5/f
   4: add d4/f
   3: add d3/f
   2: add d2/f
   1: add d1/f
   0: add d0/f
   $ cd ..
 
 Error if '.' or '..' are in the directory to track.
   $ hg clone --narrow ssh://user@dummy/master foo --include ./asdf
   abort: "." and ".." are not allowed in narrowspec paths
   [255]
   $ hg clone --narrow ssh://user@dummy/master foo --include asdf/..
   abort: "." and ".." are not allowed in narrowspec paths
   [255]
   $ hg clone --narrow ssh://user@dummy/master foo --include a/./c
   abort: "." and ".." are not allowed in narrowspec paths
   [255]
 
 Names with '.' in them are OK.
   $ hg clone --narrow ./master should-work --include a/.b/c
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 0 changes to 0 files
   new changesets * (glob)
   updating to branch default
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
+The "narrow" repo requirement is ignored by [debugupgraderepo]
+
+#if tree
+  $ (cd should-work; hg debugupgraderepo)
+  abort: cannot upgrade repository; unsupported source requirement: treemanifest
+  [255]
+#else
+  $ (cd should-work; hg debugupgraderepo | grep 'no format upgrades found in existing repository')
+  (no format upgrades found in existing repository)
+#endif
+
 Test repo with local changes
   $ hg clone --narrow ssh://user@dummy/master narrow-local-changes --include d0 --include d3 --include d6
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 6 changesets with 3 changes to 3 files
   new changesets *:* (glob)
   updating to branch default
   3 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd narrow-local-changes
   $ echo local change >> d0/f
   $ hg ci -m 'local change to d0'
   $ hg co '.^'
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ echo local change >> d3/f
   $ hg ci -m 'local hidden change to d3'
   created new head
   $ hg ci --amend -m 'local change to d3'
   $ hg tracked --removeinclude d0
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   The following changeset(s) or their ancestors have local changes not on the remote:
   * (glob)
   abort: local changes found
   (use --force-delete-local-changes to ignore)
   [20]
 Check that nothing was removed by the failed attempts
   $ hg tracked
   I path:d0
   I path:d3
   I path:d6
   $ hg files
   d0/f
   d3/f
   d6/f
   $ find *
   d0
   d0/f
   d3
   d3/f
   d6
   d6/f
   $ hg verify -q
 Force deletion of local changes
   $ hg log -T "{rev}: {desc} {outsidenarrow}\n"
   8: local change to d3 
   6: local change to d0 
   5: add d10/f outsidenarrow
   4: add d6/f 
   3: add d5/f outsidenarrow
   2: add d3/f 
   1: add d2/f outsidenarrow
   0: add d0/f 
   $ hg tracked --removeinclude d0 --force-delete-local-changes
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   The following changeset(s) or their ancestors have local changes not on the remote:
   * (glob)
   moving unwanted changesets to backup
   saved backup bundle to $TESTTMP/narrow-local-changes/.hg/strip-backup/*-narrow.hg (glob)
   deleting data/d0/f.i (reporevlogstore !)
   deleting meta/d0/00manifest.i (tree !)
   deleting data/d0/f/362fef284ce2ca02aecc8de6d5e8a1c3af0556fe (reposimplestore !)
   deleting data/d0/f/4374b5650fc5ae54ac857c0f0381971fdde376f7 (reposimplestore !)
   deleting data/d0/f/index (reposimplestore !)
   deleting unwanted files from working copy
 
   $ hg log -T "{rev}: {desc} {outsidenarrow}\n"
   7: local change to d3 
   5: add d10/f outsidenarrow
   4: add d6/f 
   3: add d5/f outsidenarrow
   2: add d3/f 
   1: add d2/f outsidenarrow
   0: add d0/f outsidenarrow
 Can restore stripped local changes after widening
   $ hg tracked --addinclude d0 -q
   $ hg unbundle .hg/strip-backup/*-narrow.hg -q
   $ hg --hidden co -r 'desc("local change to d0")' -q
   $ cat d0/f
   0
   local change
 Pruned commits affecting removed paths should not prevent narrowing
   $ hg co '.^'
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg debugobsolete `hg log -T '{node}' -r 'desc("local change to d0")'`
   1 new obsolescence markers
   obsoleted 1 changesets
   $ hg tracked --removeinclude d0
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   moving unwanted changesets to backup
   saved backup bundle to $TESTTMP/narrow-local-changes/.hg/strip-backup/*-narrow.hg (glob)
   deleting data/d0/f.i (reporevlogstore !)
   deleting meta/d0/00manifest.i (tree !)
   deleting data/d0/f/362fef284ce2ca02aecc8de6d5e8a1c3af0556fe (reposimplestore !)
   deleting data/d0/f/4374b5650fc5ae54ac857c0f0381971fdde376f7 (reposimplestore !)
   deleting data/d0/f/index (reposimplestore !)
   deleting unwanted files from working copy
 
 Updates off of stripped commit if necessary
   $ hg co -r 'desc("local change to d3")' -q
   $ echo local change >> d6/f
   $ hg ci -m 'local change to d6'
   $ hg tracked --removeinclude d3 --force-delete-local-changes
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   The following changeset(s) or their ancestors have local changes not on the remote:
   * (glob)
   * (glob)
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   moving unwanted changesets to backup
   saved backup bundle to $TESTTMP/narrow-local-changes/.hg/strip-backup/*-narrow.hg (glob)
   deleting data/d3/f.i (reporevlogstore !)
   deleting meta/d3/00manifest.i (tree !)
   deleting data/d3/f/2661d26c649684b482d10f91960cc3db683c38b4 (reposimplestore !)
   deleting data/d3/f/99fa7136105a15e2045ce3d9152e4837c5349e4d (reposimplestore !)
   deleting data/d3/f/index (reposimplestore !)
   deleting unwanted files from working copy
   $ hg log -T '{desc}\n' -r .
   add d10/f
 Updates to nullid if necessary
   $ hg tracked --addinclude d3 -q
   $ hg co null -q
   $ mkdir d3
   $ echo local change > d3/f
   $ hg add d3/f
   $ hg ci -m 'local change to d3'
   created new head
   $ hg tracked --removeinclude d3 --force-delete-local-changes
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   The following changeset(s) or their ancestors have local changes not on the remote:
   * (glob)
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
   moving unwanted changesets to backup
   saved backup bundle to $TESTTMP/narrow-local-changes/.hg/strip-backup/*-narrow.hg (glob)
   deleting data/d3/f.i (reporevlogstore !)
   deleting meta/d3/00manifest.i (tree !)
   deleting data/d3/f/2661d26c649684b482d10f91960cc3db683c38b4 (reposimplestore !)
   deleting data/d3/f/5ce0767945cbdbca3b924bb9fbf5143f72ab40ac (reposimplestore !)
   deleting data/d3/f/index (reposimplestore !)
   deleting unwanted files from working copy
   $ hg id
   000000000000
   $ cd ..
 
 Narrowing doesn't resurrect old commits (unlike what regular `hg strip` does)
   $ hg clone --narrow ssh://user@dummy/master narrow-obsmarkers --include d0 --include d3 -q
   $ cd narrow-obsmarkers
   $ echo a >> d0/f2
   $ hg add d0/f2
   $ hg ci -m 'modify d0/'
   $ echo a >> d3/f2
   $ hg add d3/f2
   $ hg commit --amend -m 'modify d0/ and d3/'
   $ hg log -T "{rev}: {desc}\n"
   5: modify d0/ and d3/
   3: add d10/f
   2: add d3/f
   1: add d2/f
   0: add d0/f
   $ hg tracked --removeinclude d3 --force-delete-local-changes -q
   $ hg log -T "{rev}: {desc}\n"
   3: add d10/f
   2: add d3/f
   1: add d2/f
   0: add d0/f
   $ cd ..
 
 Widening doesn't lose bookmarks
   $ hg clone --narrow ssh://user@dummy/master widen-bookmarks --include d0 -q
   $ cd widen-bookmarks
   $ hg bookmark my-bookmark
   $ hg log -T "{rev}: {desc} {bookmarks}\n"
   1: add d10/f my-bookmark
   0: add d0/f 
   $ hg tracked --addinclude d3 -q
   $ hg log -T "{rev}: {desc} {bookmarks}\n"
   3: add d10/f my-bookmark
   2: add d3/f 
   1: add d2/f 
   0: add d0/f 
   $ cd ..
 
 Can remove last include, making repo empty
   $ hg clone --narrow ssh://user@dummy/master narrow-empty --include d0 -r 5
   adding changesets
   adding manifests
   adding file changes
   added 2 changesets with 1 changes to 1 files
   new changesets *:* (glob)
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd narrow-empty
   $ hg tracked --removeinclude d0
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   deleting data/d0/f.i (reporevlogstore !)
   deleting meta/d0/00manifest.i (tree !)
   deleting data/d0/f/362fef284ce2ca02aecc8de6d5e8a1c3af0556fe (reposimplestore !)
   deleting data/d0/f/index (reposimplestore !)
   deleting unwanted files from working copy
   $ hg tracked
   $ hg files
   [1]
   $ test -d d0
   [1]
 Do some work in the empty clone
   $ hg diff --change .
   $ hg branch foo
   marked working directory as branch foo
   (branches are permanent and global, did you want a bookmark?)
   $ hg ci -m empty
   $ hg log -T "{rev}: {desc} {outsidenarrow}\n"
   2: empty 
   1: add d5/f outsidenarrow
   0: add d0/f outsidenarrow
   $ hg pull -q
 Can widen the empty clone
   $ hg tracked --addinclude d0
   comparing with ssh://user@dummy/master
   searching for changes
   saved backup bundle to $TESTTMP/narrow-empty/.hg/strip-backup/*-widen.hg (glob)
   adding changesets
   adding manifests
   adding file changes
   added 4 changesets with 1 changes to 1 files (+1 heads)
   $ hg tracked
   I path:d0
   $ hg files
   d0/f
   $ find *
   d0
   d0/f
   $ cd ..
 
 TODO(martinvonz): test including e.g. d3/g and then removing it once
 https://bitbucket.org/Google/narrowhg/issues/6 is fixed
 
   $ hg clone --narrow ssh://user@dummy/master narrow --include d0 --include d3 --include d6 --include d9
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 8 changesets with 4 changes to 4 files
   new changesets *:* (glob)
   updating to branch default
   4 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd narrow
   $ hg tracked
   I path:d0
   I path:d3
   I path:d6
   I path:d9
   $ hg tracked --removeinclude d6
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   deleting data/d6/f.i (reporevlogstore !)
   deleting meta/d6/00manifest.i (tree !)
   deleting data/d6/f/7339d30678f451ac8c3f38753beeb4cf2e1655c7 (reposimplestore !)
   deleting data/d6/f/index (reposimplestore !)
   deleting unwanted files from working copy
   $ hg tracked
   I path:d0
   I path:d3
   I path:d9
 #if repofncache
   $ hg debugrebuildfncache
   fncache already up to date
 #endif
   $ find *
   d0
   d0/f
   d3
   d3/f
   d9
   d9/f
   $ hg verify -q
   $ hg tracked --addexclude d3/f
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   deleting data/d3/f.i (reporevlogstore !)
   deleting data/d3/f/2661d26c649684b482d10f91960cc3db683c38b4 (reposimplestore !)
   deleting data/d3/f/index (reposimplestore !)
   deleting unwanted files from working copy
   $ hg tracked
   I path:d0
   I path:d3
   I path:d9
   X path:d3/f
 #if repofncache
   $ hg debugrebuildfncache
   fncache already up to date
 #endif
   $ find *
   d0
   d0/f
   d9
   d9/f
   $ hg verify -q
   $ hg tracked --addexclude d0
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   deleting data/d0/f.i (reporevlogstore !)
   deleting meta/d0/00manifest.i (tree !)
   deleting data/d0/f/362fef284ce2ca02aecc8de6d5e8a1c3af0556fe (reposimplestore !)
   deleting data/d0/f/index (reposimplestore !)
   deleting unwanted files from working copy
   $ hg tracked
   I path:d3
   I path:d9
   X path:d0
   X path:d3/f
 #if repofncache
   $ hg debugrebuildfncache
   fncache already up to date
 #endif
   $ find *
   d9
   d9/f
 
 Make a 15 of changes to d9 to test the path without --verbose
 (Note: using regexes instead of "* (glob)" because if the test fails, it
 produces more sensible diffs)
   $ hg tracked
   I path:d3
   I path:d9
   X path:d0
   X path:d3/f
   $ for x in `$TESTDIR/seq.py 1 15`
   > do
   >   echo local change >> d9/f
   >   hg commit -m "change $x to d9/f"
   > done
   $ hg tracked --removeinclude d9
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   The following changeset(s) or their ancestors have local changes not on the remote:
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ...and 5 more, use --verbose to list all
   abort: local changes found
   (use --force-delete-local-changes to ignore)
   [20]
 Now test it *with* verbose.
   $ hg tracked --removeinclude d9 --verbose
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   The following changeset(s) or their ancestors have local changes not on the remote:
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   ^[0-9a-f]{12}$ (re)
   abort: local changes found
   (use --force-delete-local-changes to ignore)
   [20]
   $ cd ..
 
 Test --auto-remove-includes
   $ hg clone --narrow ssh://user@dummy/master narrow-auto-remove -q \
   > --include d0 --include d1 --include d2
   $ cd narrow-auto-remove
   $ echo a >> d0/f
   $ hg ci -m 'local change to d0'
   $ hg co '.^'
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ echo a >> d1/f
   $ hg ci -m 'local change to d1'
   created new head
   $ hg debugobsolete $(hg log -T '{node}' -r 'desc("local change to d0")')
   1 new obsolescence markers
   obsoleted 1 changesets
   $ echo n | hg tracked --auto-remove-includes --config ui.interactive=yes
   comparing with ssh://user@dummy/master
   searching for changes
   looking for unused includes to remove
   path:d0
   path:d2
   remove these unused includes (yn)? n
   $ hg tracked --auto-remove-includes
   comparing with ssh://user@dummy/master
   searching for changes
   looking for unused includes to remove
   path:d0
   path:d2
   remove these unused includes (yn)? y
   looking for local changes to affected paths
   moving unwanted changesets to backup
   saved backup bundle to $TESTTMP/narrow-auto-remove/.hg/strip-backup/*-narrow.hg (glob)
   deleting data/d0/f.i
   deleting data/d2/f.i
   deleting meta/d0/00manifest.i (tree !)
   deleting meta/d2/00manifest.i (tree !)
   deleting unwanted files from working copy
   $ hg tracked
   I path:d1
   $ hg files
   d1/f
   $ hg tracked --auto-remove-includes
   comparing with ssh://user@dummy/master
   searching for changes
   looking for unused includes to remove
   found no unused includes
 Test --no-backup
   $ hg tracked --addinclude d0 --addinclude d2 -q
   $ hg unbundle .hg/strip-backup/*-narrow.hg -q
   $ rm .hg/strip-backup/*
   $ hg tracked --auto-remove-includes --no-backup
   comparing with ssh://user@dummy/master
   searching for changes
   looking for unused includes to remove
   path:d0
   path:d2
   remove these unused includes (yn)? y
   looking for local changes to affected paths
   deleting unwanted changesets
   deleting data/d0/f.i
   deleting data/d2/f.i
   deleting meta/d0/00manifest.i (tree !)
   deleting meta/d2/00manifest.i (tree !)
   deleting unwanted files from working copy
   $ ls .hg/strip-backup/
 
 
 Test removing include while concurrently modifying file in that path
   $ hg clone --narrow ssh://user@dummy/master narrow-concurrent-modify -q \
   > --include d0 --include d1
   $ cd narrow-concurrent-modify
   $ hg --config 'hooks.pretxnopen = echo modified >> d0/f' tracked --removeinclude d0
   comparing with ssh://user@dummy/master
   searching for changes
   looking for local changes to affected paths
   deleting data/d0/f.i
   deleting meta/d0/00manifest.i (tree !)
   deleting unwanted files from working copy
   not deleting possibly dirty file d0/f