When format 5 isn't format 5

John Arbash Meinel john at arbash-meinel.com
Tue May 16 15:40:02 BST 2006

Aaron Bentley wrote:
> Hi all,
> In updating changeset code, I've discovered that our inventory format
> has changed, without changing its version number.
> Specifically, new format 5 inventories contain a revision ID, and older
> ones do not.  It looks like this change was introduced by Robert's patch
> to get rid of the trailing revision-id in basis-inventory filenames.  I
> presume that it was intended that only basis inventories would include
> revision-ids, but it's also been applied inventories in the inventory weave.
> Revision testaments contain the inventory hash, which I believe is just
> the inventory XML SHA1 hash.  This means that fixing existing
> repositories would break signatures.
> Among other things, this strongly suggests that our unit tests should
> include a test to make sure we get a reproduceable testament when we
> commit a revision with fixed values.
> Aaron

I was pretty sure that revision testaments do *not* contain the hash of
the xml. They should custom generate an RIO format of the inventory, and
hash that.
Our Revision XML does contain a bogus hash of the inventory XML. Bogus
because it is never checked, and is semi-inconsistent.
Which is why we wanted to change the inventory_sha1= into testament_sha1
or something more useful like that.


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