Foreign Branches

[Jelmer Vernooij]

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Hi,

The past few days I've been looking at implementing support for
foreign branches (http://bazaar.canonical.com/BzrForeignBranches), in
particular with Subversion in mind.

I've put up a branch that includes support for registering custom
branch types at http://jelmer.vernstok.nl/bzr/foreignbranch; the diff
between this branch and bzr.dev is attached. This basically adds a
hook in the open() and open_containing() functions of the Branch class
so that it first tries to open a URL with the "native" bzr Branch
class and if that doesn't work (raises a NotBranchError) tries with
the other registered branch types (such as SvnBranch, CvsBranch,
BazBranch, etc).

Is the right approach? Would it make more sense if I merged the open()
and open_containing() function of _Branch into __init__() ? Please
comment.

Jelmer
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