mercurial/branchmap.py
author Pierre-Yves David <pierre-yves.david@logilab.fr>
Thu, 20 Dec 2012 16:28:43 +0100
changeset 18128 f0d56efaa35a
parent 18127 dcd43ac7572d
child 18129 3264d3ce53a0
permissions -rw-r--r--
branchmap: make write a method on the branchmap object
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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def read(repo):
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    partial = branchcache()
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    try:
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        f = repo.opener("cache/branchheads")
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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 branchcache()
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    try:
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        last, lrev = lines.pop(0).split(" ", 1)
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        last, lrev = bin(last), int(lrev)
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        if lrev >= len(repo) or repo[lrev].node() != last:
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            # invalidate the cache
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            raise ValueError('invalidating branch cache (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('invalidating branch cache because node '+
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                                 '%s does not exist' % node)
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            partial.setdefault(label, []).append(bin(node))
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        partial.tipnode = last
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        partial.tiprev = lrev
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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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            repo.ui.warn(str(inst), '\n')
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        partial = branchcache()
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    return partial
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def update(repo, partial, ctxgen):
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    """Given a branchhead cache, partial, 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 partial to be correct.
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    """
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    # collect new branch entries
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    newbranches = {}
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    for c in ctxgen:
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        newbranches.setdefault(c.branch(), []).append(c.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 = partial.setdefault(branch, [])
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        # Remove candidate heads that no longer are in the repo (e.g., as
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        # the result of a strip that just happened).  Avoid using 'node in
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        # self' here because that dives down into branchcache code somewhat
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        # recursively.
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        bheadrevs = [repo.changelog.rev(node) for node in bheads
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                     if repo.changelog.hasnode(node)]
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        newheadrevs = [repo.changelog.rev(node) for node in newnodes
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                       if repo.changelog.hasnode(node)]
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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(repo.changelog.ancestors([latest],
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                                                     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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        partial[branch] = [repo.changelog.node(rev) for rev in bheadrevs]
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    # There may be branches that cease to exist when the last commit in the
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    # branch was stripped.  This code filters them out.  Note that the
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    # branch that ceased to exist may not be in newbranches because
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    # newbranches is the set of candidate heads, which when you strip the
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    # last commit in a branch will be the parent branch.
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    for branch in partial.keys():
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        nodes = [head for head in partial[branch]
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                 if repo.changelog.hasnode(head)]
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        if not nodes:
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            del partial[branch]
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def updatecache(repo):
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    repo = repo.unfiltered()  # Until we get a smarter cache management
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    cl = repo.changelog
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    tip = cl.tip()
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    partial = repo._branchcache
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    if partial is not None and partial.tipnode == tip:
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        return
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    if partial is None or partial.tipnode not in cl.nodemap:
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        partial = read(repo)
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    catip = repo._cacheabletip()
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    # if partial.tiprev == catip: cache is already up to date
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    # if partial.tiprev >  catip: we have uncachable element in `partial` can't
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    #                             write on disk
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    if partial.tiprev < catip:
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        ctxgen = (repo[r] for r in cl.revs(partial.tiprev + 1, catip))
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        update(repo, partial, ctxgen)
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        partial.tipnode = cl.node(catip)
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        partial.tiprev = catip
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        partial.write(repo)
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    # If cacheable tip were lower than actual tip, we need to update the
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    # cache up to tip. This update (from cacheable to actual tip) is not
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    # written to disk since it's not cacheable.
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    tiprev = len(repo) - 1
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    if partial.tiprev < tiprev:
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        ctxgen = (repo[r] for r in cl.revs(partial.tiprev + 1, tiprev))
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        update(repo, partial, ctxgen)
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        partial.tipnode = cl.node(tiprev)
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        partial.tiprev = tiprev
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    repo._branchcache = 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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        super(branchcache, self).__init__(entries)
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        self.tipnode = tipnode
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        self.tiprev = tiprev
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    def write(self, repo):
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        try:
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            f = repo.opener("cache/branchheads", "w", atomictemp=True)
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            f.write("%s %s\n" % (hex(self.tipnode), self.tiprev))
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            for label, nodes in 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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        except (IOError, OSError):
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            pass