subrepo/svn: fix checked out rev number retrieval (issue2968) The initial version was to take the "Revision" field from svn info. It works but produces false positive when parent paths are being moved or unrelated changes are being committed, causing it to change while the svn checkout itself remains the same. To avoid spurious commit, we took "Revision" and "Last Changed Rev" for general comparison and kept the latter to answer "what is your revision?" question. This is better but fails when the subrepo path exists at "Revision" but not at "Last Changed Rev". This patch adds a check for this, and returns "Revision" if the path does not exist. We try to avoid doing this as much as possible at it implies an extra, *remote* call.

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  $ hg init dir

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  $ cd dir

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  $ echo bleh > bar

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  $ hg add bar

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  $ hg ci -m 'add bar'

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  $ hg cp bar foo

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  $ echo >> bar

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  $ hg ci -m 'cp bar foo; change bar'

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  $ hg debugrename foo

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  foo renamed from bar:26d3ca0dfd18e44d796b564e38dd173c9668d3a9

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  $ hg debugindex bar

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     rev    offset  length   base linkrev nodeid       p1           p2

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       0         0       6      0       0 26d3ca0dfd18 000000000000 000000000000

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       1         6       7      1       1 d267bddd54f7 26d3ca0dfd18 000000000000