[MERGE][0.15] a few pointers needed for solving a bug

[Robert Collins]

On Sun, 2007-03-25 at 22:39 +1000, Martin Pool wrote:
> 
> I am not sure these last two assertions are correct.  As I understand
> it, the 'r' records just tell you where, within one tree, a particular
> file id can be found, and they don't necessarily require back pointers
> across trees. 

For each id in the dirstate, there is one key for each distinct path
that has that id across all trees.
For each tree then, if the id is not in the tree, the details for all
the keys must be 'a'.
If the id is in the tree it must have one precisely one key which is not
r. All the other keys for that id must be 'r' and point at the path of
the key which is r.

That is, you do need to check the data even when the id isn't in the
tree.

-Rob



-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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