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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# test children command

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cat <<EOF >> $HGRCPATH

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[extensions]

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hgext.children=

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EOF

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echo "% init"

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hg init t

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cd t

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echo "% no working directory"

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hg children

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echo % setup

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echo 0 > file0

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hg ci -qAm 0 -d '0 0'

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echo 1 > file1

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hg ci -qAm 1 -d '1 0'

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echo 2 >> file0

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hg ci -qAm 2 -d '2 0'

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hg co null

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echo 3 > file3

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hg ci -qAm 3 -d '3 0'

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echo "% hg children at revision 3 (tip)"

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hg children

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hg co null

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echo "% hg children at nullrev (should be 0 and 3)"

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hg children

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hg co 1

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echo "% hg children at revision 1 (should be 2)"

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hg children

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hg co 2

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echo "% hg children at revision 2 (other head)"

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hg children

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for i in null 0 1 2 3; do

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  echo "% hg children -r $i"

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  hg children -r $i

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done

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echo "% hg children -r 0 file0 (should be 2)"

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hg children -r 0 file0

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echo "% hg children -r 1 file0 (should be 2)"

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hg children -r 1 file0

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hg co 0

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echo "% hg children file0 at revision 0 (should be 2)"

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hg children file0

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