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When a release of bzr is done, all the older numbered development
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formats will be removed from 'bzr.dev', so we will not be carrying the
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code for them around indefinately.
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code for them around indefinately.
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Support for upgrade and migration
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---------------------------------
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- users of a given development format can always get back onto regular
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formats by switching to the next bzr released version which is
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guaranteed to be able to upgrade from that development format.
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- users that routinely use bzr.dev should upgrade to the most recent
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- users that routinely use bzr.dev should upgrade to the most recent
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development version available before pulling in bzr.dev changes
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around release time, as that is when old format cleanups will occur.
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If you need any help or encounter any problems, please contact the developers
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via the usual ways, i.e. chat to us on IRC or send a message to our mailing
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list. See http://bazaar-vcs.org/BzrSupport for contact details.
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list. See http://wiki.bazaar.canonical.com/BzrSupport for contact details.
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``bzrlib.repofmt``. You probably want to reproduce the current
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development format from ``bzrlib.repofmt.pack_repo`` with just new
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disk format strings, ``_get_matching_bzrdir`` and help.
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4. Alter any other things that do class based tests. The easiest way
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4. Register your development format with the various registries. At the
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moment you need to update:
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1. ``bzrlib/bzrdir.py`` to register the WT/Branch/Repository
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2. ``bzrlib/workingtree.py``, ``bzrlib/branch.py``,
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``bzrlib/repository.py``, each one maintains a direct list of
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their respective formats.
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3. For repositories, you also need to update the InterKnit1and2
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class. This is responsible for converting between rich-root and
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non-rich-root repositories.
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4. For repositories based on KnitPackRepository, you need to update
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``bzrlib/tests/test_pack_repository.py`` to add the class to the
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5. Alter any other things that do class based tests. The easiest way
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to find these is a grep for Development in bzrlib - and please
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refactor as you find these to reduce the relevance this step has,
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as it should not need to exist.
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5. Now subclass/create from scratch/whatever the live object code you
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6. Now subclass/create from scratch/whatever the live object code you
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need to change to introduce your new format. Keep in mind that
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eventually it will become the default format, so please don't keep
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subclassing the last releases code, rather consider making the last
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releases code a subclass of your new code (if there is a lot in
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common) so that we can eventually remove that format once it becomes
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ancient (or relegate it to a plugin).
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6. Once you have made the changes that required a new disk format, you
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7. Once you have made the changes that required a new disk format, you
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should submit the resulting branch to be merged. Other changes - to
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take advantage of whatever new feature you have added - should be
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sent in separately, because the disk level changes are a contention
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Currently an alias for Development2
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Not currently available, as our development formats are all rich root or
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development-rich-root
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---------------------
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Currently an alias for Development6Subtree
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development-subtree
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-------------------
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Currently an alias for Development2Subtree
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Development2[Subtree]
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---------------------
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These formats use B+Tree indices which are considerably faster than
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the earlier indices in bzr.
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Currently an alias for Development6Subtree
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Development6RichRoot[Subtree]
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-----------------------------
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These formats use the new groupcompress delta compress and a CHK(Content
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Hash Key) based inventory store which is much faster at incremental
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operations than the prior XML based store.
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*Note* Converting from a non-rich-root to a rich-root format is a
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one-way upgrade, and you cannot merge back afterwards: using this format
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for everyday use is likely to cause all developers of a project to
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upgrade to a rich-root format themselves. This is fine, as bzr is moving
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to make rich-root formats the default and to get all users to upgrade,
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but we have not finalised the migration process, and until we do do not
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recomment that casual users upgrade. Users of bzr-svn are already using
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rich-root formats and can test with this with impunity.