[merge] tags in repository

[Aaron Bentley]

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Martin Pool wrote:
> This adds tags stored in the repository, and visible across branches in
> that repository.  Adding a tag doesn't require a commit.  Tags are
> 'global' across projects so people should use them appropriately - eg
> putting the project name at the start of the tag like 'bzr-0.14'.  
> 
> Tags are copied by commands like push, pull, merge, branch.  This is
> done in the command line level rather than from eg fetch (but I'm open
> to changing it) because commands might want 'pull --no-tags' or 'pull
> --overwrite-tags' in the future.
> 
> This incidentally adds a -d option to override the default directory for
> some commands, for ease of testing and because it's previously been
> requested.

That is nice.  Does it accept URLs or just local paths?

> Implementation notes:
> 
>  * This adds them into the KnitRepository2 format.  I would like them to
>    be in the default format for the next release, but I'm not sure if 
>    all the changes in KnitRepository2 are in that class.

I wasn't planning on making knit2 the default format, ever.  Knit2
supports full root metadata, but unless deployed with a new working tree
format, it won't have unique root ids.

So I've been working on WorkingTree4, but it supports by-reference trees
as well as unique roots, so it requires KnitRepository3.

But if you're going to introduce a new repo format as the default, I
guess it might as well be KnitRepository2.  KnitRepository2 isn't a bad
choice-- the only real difference from 3 is whether the inventory
supports by-reference trees.

>  * Delete tags

Given that we don't want deleted tags to reappear when fetching, perhaps
deletion should actually set the tag to a special value, e.g. 'deleted:'.

Aaron
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