Serializer_v5._pack_revision and _unpack_revision to become public?

[David Allouche]

On Mon, 2006-01-16 at 09:56 +1100, Robert Collins wrote:
> We're deprecating all the XML facilities anyway. So : what does your
> extension data look like? Would a black-box storage mechanism that lets
> you do much the same thing suffice? 

The bzrk cache I am using is a XML file store in .bzr/x-bzrk-revisions.

It is read using Branch.controlfile and written using the same
combination of Branch.controfilename and AtomicFile as .bzr/parent.

Its format looks like:

<collection>
  <revision yadda yadda>blah blah blah</revision>
  <dummy revision_id="jabberwock"/>
  ...
</collection>

<revision> and <dummy> items are unordered.

The whole file is read and written using elementtree classes imported
from bzrlib.xml (to reuse the import logic that uses cElementTree if
it's available).

The <revision> elements are created and processed using _pack_revision
and _unpack_revision.

The <dummy> elements are used to record which revisions were previously
found to be ghosts (there is a "bzr vis --ghost" option to ignore
<dummy> elements when reading the cache).

The requirements for the cache are the following:

      * Fast to read and write. cElementTree is fast at reading, but
        still seems to use a Python implementation for writing. I would
        like no slower reading and faster writing.
      * Safe to use with data that is no more trusted than any branch
        data than you can find anywhere on the internet.
      * Allows embedding of blackbox bzr data in a foreign data format.
        I do not care how revisions are stored, but I want to mix them
        with my own data.

-- 
                                                            -- ddaa
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