From: Jan Harkes <jaharkes@cs.cmu.edu>
Date: Sat, 02 Jul 2005 20:38:06 GMT
Subject: Re: Tags
Message-ID: <20050702203805.GB19206@delft.aura.cs.cmu.edu>
In-Reply-To: <42C5DA77.4030107@zytor.com>

On Fri, Jul 01, 2005 at 05:06:15PM -0700, H. Peter Anvin wrote:
> Eric W. Biederman wrote:
> >
> >If I really care what developer xyz tagged I will pull from them,
> >or a mirror I trust.  And since developer xyz doesn't pull his
> >own global tags from other repositories that should be sufficient.
> >
> 
> You're missing something totally and utterly fundamental here: I'm 
> talking about creating an infrastructure (think sourceforge) where there 
> is only one git repository for the whole system, period, full stop, end 
> of story.

I'm not entirely sure what you are envisoning, but it is definitely
doable in a secure way.

- Assume that each developer will one or more private trees with one or
  more branches on kernel.org, lets say all these private repositories
  are stored under /scm/git/<user>/

- Now you create a single 'global repository' which is going to be the
  publicly visible one that will be mirrored out,

- Then you run the following script (untested)
  #!/bin/sh
  GIT_DIR=$global_repo
  for user in `(cd /scm/git ; ls)`; do
    for tree in `find /scm/git/$user -name *.git` ; do
	for ref in `find $tree/refs -type f`  ; do
	    type=`echo $ref | sed 'sX^.*/refs/\([^/]*\)/.*$X\1X'`
	    name=`echo $ref | sed 'sX^.*/refs/[^/]*/\(.*\)$X\1X'`
	    git fetch /scm/git/$tree $branch 
	    mkdir -p $GIT_DIR/refs/$type/$user/$name
	    cat $GIT_DIR/FETCH_HEAD > $GIT_DIR/refs/$type/$user/$name
	done
    done
  done

- You can repack the global repository whenever you want.
- Finally, once a user knows that all his changes are available from the
  global repository, he can remove any objects from his tree and use
  GIT_ALTERNATE_OBJECT_DIRECTORIES=$global_repo/objects
  (maybe there should be a flag for git prune to removes local objects
  that are already available in the alternate object directories)

Jan