convert: add a mode where mercurial_sink skips empty revisions. The getchanges function of some converter_source classes can return some false positives. I.e. they sometimes claim that a file "foo" was changed in some revision, even though its contents are still the same. convert_svn is particularly bad, but I think this can also happen with convert_cvs and, at least in theory, with mercurial_source. For regular conversions this is not really a problem - as long as getfile returns the right contents, we'll get a converted revision with the right contents. But when we use --filemap, this could lead to superfluous revisions being converted. Instead of fixing every converter_source, I decided to change mercurial_sink to work around this problem. When --filemap is used, we're interested only in revisions that touch some specific files. If a revision doesn't change any of these files, then we're not interested in it (at least for revisions with a single parent; merges are special). For mercurial_sink, we abuse this property and rollback a commit if the manifest text hasn't changed. This avoids duplicating the logic from localrepo.filecommit to detect unchanged files.

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#!/usr/bin/env python

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from mercurial import demandimport

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demandimport.enable()

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import re

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rsub = re.sub

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def f(obj):

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    l = repr(obj)

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    l = rsub("0x[0-9a-fA-F]+", "0x?", l)

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    l = rsub("from '.*'", "from '?'", l)

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    return l

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import os

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print "os =", f(os)

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print "os.system =", f(os.system)

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print "os =", f(os)

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import mercurial.version

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print "mercurial.version =", f(mercurial.version)

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print "mercurial.version.get_version =", f(mercurial.version.get_version)

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print "mercurial.version =", f(mercurial.version)

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print "mercurial =", f(mercurial)

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from mercurial import util

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print "util =", f(util)

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print "util.system =", f(util.system)

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print "util =", f(util)

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print "util.system =", f(util.system)

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import re as fred

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print "fred =", f(fred)

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import sys as re

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print "re =", f(re)

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print "fred =", f(fred)

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print "fred.sub =", f(fred.sub)

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print "fred =", f(fred)

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print "re =", f(re)

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print "re.stdout =", f(re.stdout)

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print "re =", f(re)