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[andrew.cunningham]

Hello!

It is possible to use multiple mercurial repositories from one directory?  
Or alternatively, is it possible to tag a certain set of files in a 
repository, such that it is possible to work with commits etc on that set of 
files only?

To explain the situation, I am managing some component based software used 
in a software product line style.  Traditionally, we have always put all 
source code into one directory.  This core software is then used to build 
custom applications, with a start point of copying the required set of core 
components to a new environment, and then getting on with the tailoring.

We've got the entirety of the core system under version control, and also 
the entirety of project applications, but no easy way of linking the two.  
I've manually written some scripts which can be run on a project codebase to 
diff or retrieve an individual plugin from the core system.  But I'd ideally 
like to be able to do this with mercurial.

So an example component might comprise the files:
email.plugin
email_lib.c
web_email_settings.c
email_test.c

I'd like the ability to add a feature to the core email plugin and do 
something like 'hg commit email'.  Then from a project, be able to do a 'hg 
pull email' to grab that feature.

Any ideas?  I know I can wrap the whole thing in shell scripts, but if 
Mercurial already has something to handle this, I'd prefer to use that.

Cheers,

Andy
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