mercurial/branchmap.py
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Mon, 30 Sep 2013 15:52:37 +0200
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child 19838 23386881abeb
permissions -rw-r--r--
branchmap: fix blank line position The blank line was after was after the `if` condition instead of before.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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, repoview
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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/branchheads"
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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, label = l.split(" ", 1)
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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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            partial.setdefault(label, []).append(bin(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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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 = repoview.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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    def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev,
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                 filteredhash=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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    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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   113
            key = s.digest()
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        return key
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   115
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    def validfor(self, repo):
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        """Is the cache content valid regarding a repo
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   118
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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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   124
        except IndexError:
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   125
            return False
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   126
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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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   130
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   131
    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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   135
            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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   138
            for label, nodes in sorted(self.iteritems()):
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                for node in nodes:
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                    f.write("%s %s\n" % (hex(node), encoding.fromlocal(label)))
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            f.close()
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   142
        except (IOError, OSError, util.Abort):
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   143
            # Abort may be raise by read only opener
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            pass
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   145
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   146
    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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   149
        heads missing, this function updates self to be correct.
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   150
        """
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        cl = repo.changelog
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   152
        # collect new branch entries
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        newbranches = {}
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        getbranch = cl.branch
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        for r in revgen:
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   156
            newbranches.setdefault(getbranch(r), []).append(cl.node(r))
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   157
        # if older branchheads are reachable from new ones, they aren't
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   158
        # really branchheads. Note checking parents is insufficient:
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   159
        # 1 (branch a) -> 2 (branch b) -> 3 (branch a)
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   160
        for branch, newnodes in newbranches.iteritems():
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   161
            bheads = self.setdefault(branch, [])
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   162
            # Remove candidate heads that no longer are in the repo (e.g., as
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   163
            # the result of a strip that just happened).  Avoid using 'node in
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   164
            # self' here because that dives down into branchcache code somewhat
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   165
            # recursively.
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   166
            bheadrevs = [cl.rev(node) for node in bheads
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   167
                         if cl.hasnode(node)]
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   168
            newheadrevs = [cl.rev(node) for node in newnodes
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   169
                           if cl.hasnode(node)]
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   170
            ctxisnew = bheadrevs and min(newheadrevs) > max(bheadrevs)
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   171
            # Remove duplicates - nodes that are in newheadrevs and are already
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   172
            # in bheadrevs.  This can happen if you strip a node whose parent
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   173
            # was already a head (because they're on different branches).
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   174
            bheadrevs = sorted(set(bheadrevs).union(newheadrevs))
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   175
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   176
            # Starting from tip means fewer passes over reachable.  If we know
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   177
            # the new candidates are not ancestors of existing heads, we don't
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   178
            # have to examine ancestors of existing heads
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   179
            if ctxisnew:
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   180
                iterrevs = sorted(newheadrevs)
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   181
            else:
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   182
                iterrevs = list(bheadrevs)
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   183
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   184
            # This loop prunes out two kinds of heads - heads that are
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   185
            # superseded by a head in newheadrevs, and newheadrevs that are not
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   186
            # heads because an existing head is their descendant.
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   187
            while iterrevs:
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   188
                latest = iterrevs.pop()
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   189
                if latest not in bheadrevs:
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   190
                    continue
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   191
                ancestors = set(cl.ancestors([latest],
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   192
                                                         bheadrevs[0]))
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   193
                if ancestors:
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   194
                    bheadrevs = [b for b in bheadrevs if b not in ancestors]
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   195
            self[branch] = [cl.node(rev) for rev in bheadrevs]
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   196
            tiprev = max(bheadrevs)
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   197
            if tiprev > self.tiprev:
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   198
                self.tipnode = cl.node(tiprev)
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   199
                self.tiprev = tiprev
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   200
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   201
        # There may be branches that cease to exist when the last commit in the
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   202
        # branch was stripped.  This code filters them out.  Note that the
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   203
        # branch that ceased to exist may not be in newbranches because
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   204
        # newbranches is the set of candidate heads, which when you strip the
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   205
        # last commit in a branch will be the parent branch.
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   206
        droppednodes = []
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   207
        for branch in self.keys():
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   208
            nodes = [head for head in self[branch]
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   209
                     if cl.hasnode(head)]
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   210
            if not nodes:
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   211
                droppednodes.extend(nodes)
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   212
                del self[branch]
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   213
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   214
        if ((not self.validfor(repo)) or (self.tipnode in droppednodes)):
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diff changeset
   215
            # cache key are not valid anymore
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   216
            self.tipnode = nullid
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   217
            self.tiprev = nullrev
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   218
            for heads in self.values():
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   219
                tiprev = max(cl.rev(node) for node in heads)
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   220
                if tiprev > self.tiprev:
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   221
                    self.tipnode = cl.node(tiprev)
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   222
                    self.tiprev = tiprev
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   223
        self.filteredhash = self._hashfiltered(repo)