mercurial/treediscovery.py
author Martin von Zweigbergk <martinvonz@gmail.com>
Sun, 12 Oct 2014 00:00:13 -0700
changeset 23238 39eb9f78f968
parent 20225 d2704c48f417
child 25113 0ca8410ea345
permissions -rw-r--r--
context.status: move manifest caching trick to _buildstatus() In basectx._buildstatus(), we read the manifests for the two revisions being compared. For "caching reasons" unknown to me, it is better to read the earlier manifest first, which basectx._prestatus() takes care of. However, if the 'self' context is a committablectx and the 'other' context is the parent of the working directory (as in the very common case of plain "hg status"), there is no need to read any manifests at all -- all that's needed is the dirstate status. To avoid reading the manifests, _prestatus() is overridden in committablectx and avoids calling its super method, and _buildstatus() calls its super method only if the 'other' context is not the parent of the working directory. It seems easier to follow what's happening if we move the pre-fetching to _buildstatus() just before the place where the manifests are fetched. We just need to add an extra check that the revision is not None to handle the case that was previously handled by subclass overriding. That also makes it safe for committablectx._prestatus() to call its parent, although the latter now becomes empty, so we won't bother.
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# discovery.py - protocol changeset discovery functions
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#
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# Copyright 2010 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 nullid, short
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from i18n import _
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import util, error
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def findcommonincoming(repo, remote, heads=None, force=False):
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    """Return a tuple (common, fetch, heads) used to identify the common
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    subset of nodes between repo and remote.
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    "common" is a list of (at least) the heads of the common subset.
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    "fetch" is a list of roots of the nodes that would be incoming, to be
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      supplied to changegroupsubset.
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    "heads" is either the supplied heads, or else the remote's heads.
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    """
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    knownnode = repo.changelog.hasnode
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    search = []
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    fetch = set()
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    seen = set()
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    seenbranch = set()
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    base = set()
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    if not heads:
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        heads = remote.heads()
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    if repo.changelog.tip() == nullid:
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        base.add(nullid)
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        if heads != [nullid]:
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            return [nullid], [nullid], list(heads)
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        return [nullid], [], heads
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    # assume we're closer to the tip than the root
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    # and start by examining the heads
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    repo.ui.status(_("searching for changes\n"))
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    unknown = []
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    for h in heads:
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        if not knownnode(h):
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            unknown.append(h)
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        else:
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            base.add(h)
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    if not unknown:
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        return list(base), [], list(heads)
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    req = set(unknown)
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    reqcnt = 0
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    # search through remote branches
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    # a 'branch' here is a linear segment of history, with four parts:
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    # head, root, first parent, second parent
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    # (a branch always has two parents (or none) by definition)
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    unknown = util.deque(remote.branches(unknown))
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    while unknown:
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        r = []
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        while unknown:
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            n = unknown.popleft()
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            if n[0] in seen:
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                continue
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            repo.ui.debug("examining %s:%s\n"
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                          % (short(n[0]), short(n[1])))
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            if n[0] == nullid: # found the end of the branch
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                pass
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            elif n in seenbranch:
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                repo.ui.debug("branch already found\n")
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                continue
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            elif n[1] and knownnode(n[1]): # do we know the base?
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                repo.ui.debug("found incomplete branch %s:%s\n"
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                              % (short(n[0]), short(n[1])))
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                search.append(n[0:2]) # schedule branch range for scanning
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                seenbranch.add(n)
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            else:
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                if n[1] not in seen and n[1] not in fetch:
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                    if knownnode(n[2]) and knownnode(n[3]):
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                        repo.ui.debug("found new changeset %s\n" %
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                                      short(n[1]))
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                        fetch.add(n[1]) # earliest unknown
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                    for p in n[2:4]:
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                        if knownnode(p):
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                            base.add(p) # latest known
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                for p in n[2:4]:
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                    if p not in req and not knownnode(p):
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                        r.append(p)
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                        req.add(p)
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            seen.add(n[0])
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        if r:
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            reqcnt += 1
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            repo.ui.progress(_('searching'), reqcnt, unit=_('queries'))
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            repo.ui.debug("request %d: %s\n" %
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                        (reqcnt, " ".join(map(short, r))))
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            for p in xrange(0, len(r), 10):
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                for b in remote.branches(r[p:p + 10]):
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                    repo.ui.debug("received %s:%s\n" %
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                                  (short(b[0]), short(b[1])))
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                    unknown.append(b)
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    # do binary search on the branches we found
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    while search:
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        newsearch = []
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        reqcnt += 1
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        repo.ui.progress(_('searching'), reqcnt, unit=_('queries'))
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        for n, l in zip(search, remote.between(search)):
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            l.append(n[1])
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            p = n[0]
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            f = 1
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            for i in l:
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                repo.ui.debug("narrowing %d:%d %s\n" % (f, len(l), short(i)))
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                if knownnode(i):
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                    if f <= 2:
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                        repo.ui.debug("found new branch changeset %s\n" %
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                                          short(p))
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                        fetch.add(p)
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                        base.add(i)
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                    else:
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                        repo.ui.debug("narrowed branch search to %s:%s\n"
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                                      % (short(p), short(i)))
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                        newsearch.append((p, i))
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                    break
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                p, f = i, f * 2
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            search = newsearch
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    # sanity check our fetch list
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    for f in fetch:
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        if knownnode(f):
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            raise error.RepoError(_("already have changeset ")
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                                  + short(f[:4]))
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    base = list(base)
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    if base == [nullid]:
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        if force:
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            repo.ui.warn(_("warning: repository is unrelated\n"))
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        else:
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            raise util.Abort(_("repository is unrelated"))
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    repo.ui.debug("found new changesets starting at " +
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                 " ".join([short(f) for f in fetch]) + "\n")
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    repo.ui.progress(_('searching'), None)
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    repo.ui.debug("%d total queries\n" % reqcnt)
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    return base, list(fetch), heads