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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#!/bin/sh

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hg clone http://localhost:20059/ copy

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echo $?

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test -d copy || echo copy: No such file or directory

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cat > dumb.py <<EOF

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import BaseHTTPServer, SimpleHTTPServer, signal

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def run(server_class=BaseHTTPServer.HTTPServer,

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        handler_class=SimpleHTTPServer.SimpleHTTPRequestHandler):

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    server_address = ('localhost', 20059)

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    httpd = server_class(server_address, handler_class)

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    httpd.serve_forever()

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signal.signal(signal.SIGTERM, lambda x: sys.exit(0))

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run()

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EOF

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python dumb.py 2>/dev/null &

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echo $! >> $DAEMON_PIDS

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# give the server some time to start running

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sleep 1

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http_proxy= hg clone http://localhost:20059/foo copy2 2>&1 | \

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    sed -e 's/404.*/404/' -e 's/Date:.*/Date:/'

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echo $?

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kill $!