author | Boris Feld <boris.feld@octobus.net> |
Wed, 19 Sep 2018 21:02:47 +0200 | |
changeset 39886 | debc4ee597e7 |
parent 39297 | 06c976acc581 |
child 42125 | bc15e37ecc16 |
permissions | -rw-r--r-- |
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# repoview.py - Filtered view of a localrepo object |
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# |
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# Copyright 2012 Pierre-Yves David <pierre-yves.david@ens-lyon.org> |
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# Logilab SA <contact@logilab.fr> |
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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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import copy |
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import weakref |
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from .node import nullrev |
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from . import ( |
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obsolete, |
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phases, |
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pycompat, |
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tags as tagsmod, |
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) |
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def hideablerevs(repo): |
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"""Revision candidates to be hidden |
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This is a standalone function to allow extensions to wrap it. |
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Because we use the set of immutable changesets as a fallback subset in |
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branchmap (see mercurial.branchmap.subsettable), you cannot set "public" |
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changesets as "hideable". Doing so would break multiple code assertions and |
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lead to crashes.""" |
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obsoletes = obsolete.getrevs(repo, 'obsolete') |
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internals = repo._phasecache.getrevset(repo, phases.localhiddenphases) |
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internals = frozenset(internals) |
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return obsoletes | internals |
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def pinnedrevs(repo): |
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"""revisions blocking hidden changesets from being filtered |
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""" |
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cl = repo.changelog |
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pinned = set() |
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pinned.update([par.rev() for par in repo[None].parents()]) |
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pinned.update([cl.rev(bm) for bm in repo._bookmarks.values()]) |
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tags = {} |
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tagsmod.readlocaltags(repo.ui, repo, tags, {}) |
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if tags: |
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rev, nodemap = cl.rev, cl.nodemap |
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pinned.update(rev(t[0]) for t in tags.values() if t[0] in nodemap) |
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return pinned |
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def _revealancestors(pfunc, hidden, revs): |
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"""reveals contiguous chains of hidden ancestors of 'revs' by removing them |
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from 'hidden' |
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- pfunc(r): a funtion returning parent of 'r', |
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- hidden: the (preliminary) hidden revisions, to be updated |
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- revs: iterable of revnum, |
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(Ancestors are revealed exclusively, i.e. the elements in 'revs' are |
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*not* revealed) |
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""" |
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stack = list(revs) |
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while stack: |
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for p in pfunc(stack.pop()): |
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if p != nullrev and p in hidden: |
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hidden.remove(p) |
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stack.append(p) |
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def computehidden(repo, visibilityexceptions=None): |
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"""compute the set of hidden revision to filter |
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During most operation hidden should be filtered.""" |
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assert not repo.changelog.filteredrevs |
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hidden = hideablerevs(repo) |
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if hidden: |
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hidden = set(hidden - pinnedrevs(repo)) |
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if visibilityexceptions: |
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hidden -= visibilityexceptions |
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pfunc = repo.changelog.parentrevs |
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mutable = repo._phasecache.getrevset(repo, phases.mutablephases) |
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visible = mutable - hidden |
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_revealancestors(pfunc, hidden, visible) |
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return frozenset(hidden) |
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def computeunserved(repo, visibilityexceptions=None): |
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"""compute the set of revision that should be filtered when used a server |
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Secret and hidden changeset should not pretend to be here.""" |
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assert not repo.changelog.filteredrevs |
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# fast path in simple case to avoid impact of non optimised code |
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hiddens = filterrevs(repo, 'visible') |
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if phases.hassecret(repo): |
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secrets = repo._phasecache.getrevset(repo, phases.remotehiddenphases) |
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return frozenset(hiddens | frozenset(secrets)) |
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else: |
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return hiddens |
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def computemutable(repo, visibilityexceptions=None): |
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assert not repo.changelog.filteredrevs |
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# fast check to avoid revset call on huge repo |
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if any(repo._phasecache.phaseroots[1:]): |
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getphase = repo._phasecache.phase |
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maymutable = filterrevs(repo, 'base') |
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return frozenset(r for r in maymutable if getphase(repo, r)) |
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return frozenset() |
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|
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def computeimpactable(repo, visibilityexceptions=None): |
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"""Everything impactable by mutable revision |
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113 |
|
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The immutable filter still have some chance to get invalidated. This will |
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happen when: |
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116 |
|
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- you garbage collect hidden changeset, |
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- public phase is moved backward, |
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- something is changed in the filtering (this could be fixed) |
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120 |
|
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This filter out any mutable changeset and any public changeset that may be |
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impacted by something happening to a mutable revision. |
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123 |
|
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This is achieved by filtered everything with a revision number egal or |
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higher than the first mutable changeset is filtered.""" |
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assert not repo.changelog.filteredrevs |
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cl = repo.changelog |
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firstmutable = len(cl) |
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for roots in repo._phasecache.phaseroots[1:]: |
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if roots: |
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firstmutable = min(firstmutable, min(cl.rev(r) for r in roots)) |
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# protect from nullrev root |
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firstmutable = max(0, firstmutable) |
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return frozenset(pycompat.xrange(firstmutable, len(cl))) |
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135 |
|
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# function to compute filtered set |
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# |
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# When adding a new filter you MUST update the table at: |
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# mercurial.branchmap.subsettable |
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# Otherwise your filter will have to recompute all its branches cache |
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# from scratch (very slow). |
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filtertable = {'visible': computehidden, |
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'visible-hidden': computehidden, |
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'served': computeunserved, |
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'immutable': computemutable, |
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'base': computeimpactable} |
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147 |
|
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def filterrevs(repo, filtername, visibilityexceptions=None): |
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"""returns set of filtered revision for this filter name |
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150 |
|
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visibilityexceptions is a set of revs which must are exceptions for |
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152 |
hidden-state and must be visible. They are dynamic and hence we should not |
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153 |
cache it's result""" |
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154 |
if filtername not in repo.filteredrevcache: |
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func = filtertable[filtername] |
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if visibilityexceptions: |
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return func(repo.unfiltered, visibilityexceptions) |
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repo.filteredrevcache[filtername] = func(repo.unfiltered()) |
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return repo.filteredrevcache[filtername] |
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160 |
|
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161 |
class repoview(object): |
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162 |
"""Provide a read/write view of a repo through a filtered changelog |
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163 |
|
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164 |
This object is used to access a filtered version of a repository without |
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165 |
altering the original repository object itself. We can not alter the |
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166 |
original object for two main reasons: |
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167 |
- It prevents the use of a repo with multiple filters at the same time. In |
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168 |
particular when multiple threads are involved. |
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169 |
- It makes scope of the filtering harder to control. |
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170 |
|
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171 |
This object behaves very closely to the original repository. All attribute |
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172 |
operations are done on the original repository: |
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173 |
- An access to `repoview.someattr` actually returns `repo.someattr`, |
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174 |
- A write to `repoview.someattr` actually sets value of `repo.someattr`, |
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175 |
- A deletion of `repoview.someattr` actually drops `someattr` |
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176 |
from `repo.__dict__`. |
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177 |
|
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178 |
The only exception is the `changelog` property. It is overridden to return |
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179 |
a (surface) copy of `repo.changelog` with some revisions filtered. The |
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180 |
`filtername` attribute of the view control the revisions that need to be |
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181 |
filtered. (the fact the changelog is copied is an implementation detail). |
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182 |
|
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183 |
Unlike attributes, this object intercepts all method calls. This means that |
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184 |
all methods are run on the `repoview` object with the filtered `changelog` |
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185 |
property. For this purpose the simple `repoview` class must be mixed with |
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186 |
the actual class of the repository. This ensures that the resulting |
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187 |
`repoview` object have the very same methods than the repo object. This |
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188 |
leads to the property below. |
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189 |
|
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190 |
repoview.method() --> repo.__class__.method(repoview) |
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191 |
|
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192 |
The inheritance has to be done dynamically because `repo` can be of any |
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193 |
subclasses of `localrepo`. Eg: `bundlerepo` or `statichttprepo`. |
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194 |
""" |
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195 |
|
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def __init__(self, repo, filtername, visibilityexceptions=None): |
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object.__setattr__(self, r'_unfilteredrepo', repo) |
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object.__setattr__(self, r'filtername', filtername) |
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object.__setattr__(self, r'_clcachekey', None) |
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object.__setattr__(self, r'_clcache', None) |
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# revs which are exceptions and must not be hidden |
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object.__setattr__(self, r'_visibilityexceptions', |
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203 |
visibilityexceptions) |
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|
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205 |
# not a propertycache on purpose we shall implement a proper cache later |
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@property |
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def changelog(self): |
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"""return a filtered version of the changeset |
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209 |
|
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this changelog must not be used for writing""" |
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# some cache may be implemented later |
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unfi = self._unfilteredrepo |
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unfichangelog = unfi.changelog |
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# bypass call to changelog.method |
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unfiindex = unfichangelog.index |
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unfilen = len(unfiindex) |
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unfinode = unfiindex[unfilen - 1][7] |
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218 |
|
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revs = filterrevs(unfi, self.filtername, self._visibilityexceptions) |
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cl = self._clcache |
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newkey = (unfilen, unfinode, hash(revs), unfichangelog._delayed) |
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# if cl.index is not unfiindex, unfi.changelog would be |
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# recreated, and our clcache refers to garbage object |
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if (cl is not None and |
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(cl.index is not unfiindex or newkey != self._clcachekey)): |
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cl = None |
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# could have been made None by the previous if |
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if cl is None: |
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cl = copy.copy(unfichangelog) |
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cl.filteredrevs = revs |
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object.__setattr__(self, r'_clcache', cl) |
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object.__setattr__(self, r'_clcachekey', newkey) |
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233 |
return cl |
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234 |
|
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235 |
def unfiltered(self): |
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"""Return an unfiltered version of a repo""" |
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return self._unfilteredrepo |
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238 |
|
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def filtered(self, name, visibilityexceptions=None): |
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"""Return a filtered version of a repository""" |
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if name == self.filtername and not visibilityexceptions: |
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return self |
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return self.unfiltered().filtered(name, visibilityexceptions) |
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244 |
|
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def __repr__(self): |
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return r'<%s:%s %r>' % (self.__class__.__name__, |
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pycompat.sysstr(self.filtername), |
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self.unfiltered()) |
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249 |
|
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# everything access are forwarded to the proxied repo |
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def __getattr__(self, attr): |
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return getattr(self._unfilteredrepo, attr) |
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253 |
|
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def __setattr__(self, attr, value): |
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return setattr(self._unfilteredrepo, attr, value) |
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256 |
|
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def __delattr__(self, attr): |
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return delattr(self._unfilteredrepo, attr) |
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259 |
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# Python <3.4 easily leaks types via __mro__. See |
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261 |
# https://bugs.python.org/issue17950. We cache dynamically created types |
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# so they won't be leaked on every invocation of repo.filtered(). |
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263 |
_filteredrepotypes = weakref.WeakKeyDictionary() |
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264 |
|
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def newtype(base): |
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266 |
"""Create a new type with the repoview mixin and the given base class""" |
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if base not in _filteredrepotypes: |
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class filteredrepo(repoview, base): |
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269 |
pass |
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_filteredrepotypes[base] = filteredrepo |
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271 |
return _filteredrepotypes[base] |