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convert: add a mode where mercurial_sink skips empty revisions....
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.
Patrick Mezard - - Load All Authors

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test-convert-svn.out
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Patrick Mezard
Test svn repository conversion
 r5255 % initial svn import
Adding t/a
Committed revision 1.
% update svn repository
A t2/a
Checked out revision 1.
A b
Sending a
Adding b
Transmitting file data ..
Committed revision 2.
% convert to hg once
assuming destination trunk-hg
initializing destination trunk-hg repository
scanning source...
sorting...
converting...
1 init
0 changea
% update svn repository again
Sending a
Sending b
Transmitting file data ..
Committed revision 3.
% test incremental conversion
assuming destination trunk-hg
destination trunk-hg is a Mercurial repository
scanning source...
sorting...
converting...
0 changeb