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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rm 'd/b'

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assuming destination git-repo-hg

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initializing destination git-repo-hg repository

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scanning source...

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sorting...

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converting...

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5 t1

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4 t2

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3 t3

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2 t4.1

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1 t4.2

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0 Merge branch other

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changeset:   5:c6d72c98aa00

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tag:         tip

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parent:      3:a18bdfccf429

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parent:      4:48cb5b72ce56

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user:        test <test@example.org>

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date:        Mon Jan 01 00:00:15 2007 +0000

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files:       a

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description:

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Merge branch other

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committer: test <test@example.org>

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