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# branchmap.py - logic to computes, maintain and stores branchmap for local repo
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#
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from node import bin, hex, nullid, nullrev
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import encoding
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import util
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def _filename(repo):
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"""name of a branchcache file for a given repo or repoview"""
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filename = "cache/branch2"
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if repo.filtername:
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filename = '%s-%s' % (filename, repo.filtername)
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return filename
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def read(repo):
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try:
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f = repo.opener(_filename(repo))
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lines = f.read().split('\n')
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f.close()
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except (IOError, OSError):
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return None
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try:
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cachekey = lines.pop(0).split(" ", 2)
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last, lrev = cachekey[:2]
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last, lrev = bin(last), int(lrev)
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filteredhash = None
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if len(cachekey) > 2:
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filteredhash = bin(cachekey[2])
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partial = branchcache(tipnode=last, tiprev=lrev,
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filteredhash=filteredhash)
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if not partial.validfor(repo):
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# invalidate the cache
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raise ValueError('tip differs')
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for l in lines:
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if not l:
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continue
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node, state, label = l.split(" ", 2)
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if state not in 'oc':
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raise ValueError('invalid branch state')
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label = encoding.tolocal(label.strip())
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if not node in repo:
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raise ValueError('node %s does not exist' % node)
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node = bin(node)
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partial.setdefault(label, []).append(node)
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if state == 'c':
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partial._closednodes.add(node)
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except KeyboardInterrupt:
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raise
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except Exception, inst:
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if repo.ui.debugflag:
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msg = 'invalid branchheads cache'
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if repo.filtername is not None:
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msg += ' (%s)' % repo.filtername
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msg += ': %s\n'
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repo.ui.warn(msg % inst)
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partial = None
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return partial
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### Nearest subset relation
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# Nearest subset of filter X is a filter Y so that:
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# * Y is included in X,
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# * X - Y is as small as possible.
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# This create and ordering used for branchmap purpose.
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# the ordering may be partial
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subsettable = {None: 'visible',
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'visible': 'served',
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'served': 'immutable',
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'immutable': 'base'}
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def updatecache(repo):
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cl = repo.changelog
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filtername = repo.filtername
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partial = repo._branchcaches.get(filtername)
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revs = []
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if partial is None or not partial.validfor(repo):
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partial = read(repo)
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if partial is None:
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subsetname = subsettable.get(filtername)
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if subsetname is None:
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partial = branchcache()
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else:
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subset = repo.filtered(subsetname)
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partial = subset.branchmap().copy()
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extrarevs = subset.changelog.filteredrevs - cl.filteredrevs
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revs.extend(r for r in extrarevs if r <= partial.tiprev)
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revs.extend(cl.revs(start=partial.tiprev + 1))
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if revs:
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partial.update(repo, revs)
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partial.write(repo)
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assert partial.validfor(repo), filtername
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repo._branchcaches[repo.filtername] = partial
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class branchcache(dict):
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"""A dict like object that hold branches heads cache.
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This cache is used to avoid costly computations to determine all the
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branch heads of a repo.
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The cache is serialized on disk in the following format:
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<tip hex node> <tip rev number> [optional filtered repo hex hash]
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<branch head hex node> <open/closed state> <branch name>
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<branch head hex node> <open/closed state> <branch name>
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...
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The first line is used to check if the cache is still valid. If the
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branch cache is for a filtered repo view, an optional third hash is
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included that hashes the hashes of all filtered revisions.
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The open/closed state is represented by a single letter 'o' or 'c'.
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This field can be used to avoid changelog reads when determining if a
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branch head closes a branch or not.
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"""
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def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev,
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filteredhash=None, closednodes=None):
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super(branchcache, self).__init__(entries)
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self.tipnode = tipnode
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self.tiprev = tiprev
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self.filteredhash = filteredhash
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# closednodes is a set of nodes that close their branch. If the branch
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# cache has been updated, it may contain nodes that are no longer
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# heads.
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if closednodes is None:
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self._closednodes = set()
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else:
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self._closednodes = closednodes
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def _hashfiltered(self, repo):
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"""build hash of revision filtered in the current cache
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Tracking tipnode and tiprev is not enough to ensure validity of the
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cache as they do not help to distinct cache that ignored various
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revision bellow tiprev.
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To detect such difference, we build a cache of all ignored revisions.
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"""
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cl = repo.changelog
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if not cl.filteredrevs:
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return None
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key = None
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revs = sorted(r for r in cl.filteredrevs if r <= self.tiprev)
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if revs:
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s = util.sha1()
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for rev in revs:
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s.update('%s;' % rev)
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key = s.digest()
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return key
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def validfor(self, repo):
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"""Is the cache content valid regarding a repo
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- False when cached tipnode is unknown or if we detect a strip.
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- True when cache is up to date or a subset of current repo."""
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try:
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return ((self.tipnode == repo.changelog.node(self.tiprev))
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and (self.filteredhash == self._hashfiltered(repo)))
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except IndexError:
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return False
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def _branchtip(self, heads):
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'''Return tuple with last open head in heads and false,
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otherwise return last closed head and true.'''
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tip = heads[-1]
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closed = True
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for h in reversed(heads):
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if h not in self._closednodes:
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tip = h
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closed = False
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break
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return tip, closed
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def branchtip(self, branch):
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'''Return the tipmost open head on branch head, otherwise return the
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tipmost closed head on branch.
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Raise KeyError for unknown branch.'''
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return self._branchtip(self[branch])[0]
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def branchheads(self, branch, closed=False):
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heads = self[branch]
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if not closed:
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heads = [h for h in heads if h not in self._closednodes]
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return heads
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def iterbranches(self):
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for bn, heads in self.iteritems():
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yield (bn, heads) + self._branchtip(heads)
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def copy(self):
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"""return an deep copy of the branchcache object"""
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return branchcache(self, self.tipnode, self.tiprev, self.filteredhash,
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self._closednodes)
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def write(self, repo):
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try:
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f = repo.opener(_filename(repo), "w", atomictemp=True)
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cachekey = [hex(self.tipnode), str(self.tiprev)]
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if self.filteredhash is not None:
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cachekey.append(hex(self.filteredhash))
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f.write(" ".join(cachekey) + '\n')
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for label, nodes in sorted(self.iteritems()):
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for node in nodes:
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if node in self._closednodes:
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state = 'c'
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else:
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state = 'o'
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f.write("%s %s %s\n" % (hex(node), state,
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encoding.fromlocal(label)))
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f.close()
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except (IOError, OSError, util.Abort):
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# Abort may be raise by read only opener
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pass
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def update(self, repo, revgen):
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"""Given a branchhead cache, self, that may have extra nodes or be
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missing heads, and a generator of nodes that are at least a superset of
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heads missing, this function updates self to be correct.
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"""
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cl = repo.changelog
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# collect new branch entries
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newbranches = {}
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getbranchinfo = cl.branchinfo
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for r in revgen:
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branch, closesbranch = getbranchinfo(r)
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node = cl.node(r)
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newbranches.setdefault(branch, []).append(node)
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if closesbranch:
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self._closednodes.add(node)
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# if older branchheads are reachable from new ones, they aren't
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# really branchheads. Note checking parents is insufficient:
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# 1 (branch a) -> 2 (branch b) -> 3 (branch a)
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for branch, newnodes in newbranches.iteritems():
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bheads = self.setdefault(branch, [])
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bheadrevs = [cl.rev(node) for node in bheads]
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newheadrevs = [cl.rev(node) for node in newnodes]
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ctxisnew = bheadrevs and min(newheadrevs) > max(bheadrevs)
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# Remove duplicates - nodes that are in newheadrevs and are already
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# in bheadrevs. This can happen if you strip a node whose parent
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# was already a head (because they're on different branches).
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bheadrevs = sorted(set(bheadrevs).union(newheadrevs))
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# Starting from tip means fewer passes over reachable. If we know
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# the new candidates are not ancestors of existing heads, we don't
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# have to examine ancestors of existing heads
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if ctxisnew:
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iterrevs = sorted(newheadrevs)
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else:
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iterrevs = list(bheadrevs)
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# This loop prunes out two kinds of heads - heads that are
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# superseded by a head in newheadrevs, and newheadrevs that are not
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# heads because an existing head is their descendant.
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while iterrevs:
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latest = iterrevs.pop()
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if latest not in bheadrevs:
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continue
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ancestors = set(cl.ancestors([latest], bheadrevs[0]))
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if ancestors:
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bheadrevs = [b for b in bheadrevs if b not in ancestors]
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self[branch] = [cl.node(rev) for rev in bheadrevs]
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tiprev = max(bheadrevs)
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if tiprev > self.tiprev:
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self.tipnode = cl.node(tiprev)
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self.tiprev = tiprev
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if not self.validfor(repo):
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# cache key are not valid anymore
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self.tipnode = nullid
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self.tiprev = nullrev
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for heads in self.values():
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tiprev = max(cl.rev(node) for node in heads)
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if tiprev > self.tiprev:
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self.tipnode = cl.node(tiprev)
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self.tiprev = tiprev
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self.filteredhash = self._hashfiltered(repo)
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