comparison mercurial/merge.py @ 18651:e556659340f0

manifestmerge: fix order in which manifests are fetched

If the manifest of an earlier revision on the same delta chain is read before
that of a later revision, the revlog remembers that we parsed the earlier
revision and continues applying deltas from there onwards. If manifests are
parsed the other way round, we have to start over from the fulltext.

For a fresh clone of mozilla-central, updating from 29dd80c95b7d to its parent
aab96936a177 requires approximately 400 fewer zlib.decompress calls, which
results in a speedup from 1.10 seconds to 1.05.

18650:de0bd4bfc6d7

    """

    overwrite = force and not branchmerge
    actions, copy, movewithdir = [], {}, {}

    if overwrite:
        pa = wctx
    elif pa == p2: # backwards
        pa = wctx.p1()
    elif not branchmerge and not wctx.dirty(missing=True):
        pass
    elif pa and repo.ui.configbool("merge", "followcopies", True):
        ret = copies.mergecopies(repo, wctx, p2, pa)
        copy, movewithdir, diverge, renamedelete = ret
        for of, fl in diverge.iteritems():
            actions.append((of, "dr", (fl,), "divergent renames"))
        for of, fl in renamedelete.iteritems():

18651:e556659340f0

    """

    overwrite = force and not branchmerge
    actions, copy, movewithdir = [], {}, {}

    followcopies = False
    if overwrite:
        pa = wctx
    elif pa == p2: # backwards
        pa = wctx.p1()
    elif not branchmerge and not wctx.dirty(missing=True):
        pass
    elif pa and repo.ui.configbool("merge", "followcopies", True):
        followcopies = True

    # manifests fetched in order are going to be faster, so prime the caches
    [x.manifest() for x in
     sorted(wctx.parents() + [p2, pa], key=lambda x: x.rev())]

    if followcopies:
        ret = copies.mergecopies(repo, wctx, p2, pa)
        copy, movewithdir, diverge, renamedelete = ret
        for of, fl in diverge.iteritems():
            actions.append((of, "dr", (fl,), "divergent renames"))
        for of, fl in renamedelete.iteritems():