[MERGE] dpush / foreign vcs testing

[Jelmer Vernooij]

Jelmer Vernooij wrote:
> Jelmer Vernooij wrote:
>> This patch adds the "dpush" command to bzr core. This command has been
>> part of bzr-svn for a while, and is now also being used in bzr-git. It
>> can push bzr revisions into a foreign version control system while not
>> copying all metadata (if metadata can not be represented in the foreign
>> version control system).
>> Since this has the consequence that it doesn't preserve revision ids or
>> file ids the local and the remote branch will have diverged after a
>> dpush operation - breaking a basic invariant of regular push. To work
>> around this, dpush can "rebase" (the actual operation is much simpler)
>> the local branch on the remote branch afterwards.
>> dpush is useful for people who don't want bzr-related metadata to show
>> up in their foreign vcs (e.g. some people have complained about
>> bzr-svn's custom svn properties), for foreign version control systems
>> that don't have a place where we can stash bzr roundtripping metadata
>> and for bzr foreign vcs plugins that don't do full roundtripping yet
>> (bzr-git / bzr-hg atm, but it would also work for e.g. CVS).
>>
>> dpush will refuse to push between native Bazaar branches.
>>
>> I've also added more infrastructure to the DummyForeignVcs* test classes
>> that have been growing in bzrlib/tests/test_foreign.py, to help test
>> dpush. This foreign vcs is based on the current bzr formats, but changed
>> slightly to make it foreign:
>>
>> * The control files live in .dummy
>> * "native" revision ids are tuples of 3 strings
>> * Each revision can only have one parent "natively"
>>
>> When running selftest for this patch, please run with --no-plugins.
>> bzr-svn and bzr-git also contain dpush at the moment, with slightly
>> different implementations.
>>   
> I'm still looking for review of this patch; it would be nice if it 
> could land in 1.14 so that bzr-git doesn't have to depend on bzr-svn 
> for dpush... :-)
Updated patch with against bzr.dev.

Cheers,

Jelmer

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