Minimum Bzr Version

[Max Kanat-Alexander]

	Hey folks. So the bzr repository is almost ready (yay)! :-)

	There's one question that we want to pose to the group, though, before
we start the migration process: What's the highest-acceptable minimum
version of bzr for you?

	Here's why this is a question:

	As bzr has evolved, they have developed better and better in-disk
formats for the repositories. In 0.92 (a very old version), they
standardized on a format called "pack" as the default. It's nice, but
there are *significant* speed advantages to the more modern formats,
which are numbered along with the versions in which they were
introduced: 1.9, 1.14, and 2.0. (The only difference is in speed--the
functionality of bzr is identical with each format.)

	2.0 is definitely the best--it shows really large differences for
checking out, branching, committing, doing a diff, log, etc.--almost all
the common commands, and it makes a real difference in everyday usage,
in my experience.

	The only problem is that 2.0 is really new (September 21, 2009). It
doesn't have any newer or different Python requirements than older
versions, though, so any system that can run any older version can run
the new version--it just might not be available from your standard
package repository.

	So what LpSolit proposed (and I think is a good idea) is that we say
this: If you want to commit to bzr, you should install 2.0. If you can't
install 2.0, we will continue to mirror bzr back to CVS, and you can use
CVS to do read-only access to the Bugzilla code base.

	Does that sound good to everybody, or would you rather require an older
bzr version at the expense of some performance?

	-Max
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