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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"$TESTDIR/hghave" symlink || exit 80

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origdir=`pwd`

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cat >> readlink.py <<EOF

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import os

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import sys

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for f in sys.argv[1:]:

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    print f, '->', os.readlink(f)

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EOF

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hg init repo

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cd repo

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ln -s nothing dangling

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hg ci -qAm 'add symlink'

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hg archive -t files ../archive

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hg archive -t tar -p tar ../archive.tar

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hg archive -t zip -p zip ../archive.zip

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echo '% files'

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cd "$origdir"

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cd archive

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python ../readlink.py dangling

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echo '% tar'

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cd "$origdir"

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tar xf archive.tar

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cd tar

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python ../readlink.py dangling

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echo '% zip'

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cd "$origdir"

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unzip archive.zip > /dev/null

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cd zip

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python ../readlink.py dangling