Re: [RFC/PATCH 0/4] working tree operations: support superprefix

Resending original as plain text as git@verger.kernel.org rejected HTML 
encoding as potential virus.  Apologies for dupes in inbox. Hopefully 
this works.

In response to a post at:

https://groups.google.com/forum/#!topic/git-users/BVLcKHhSUKo

I was asked to post here to explain a potential problem with current 
modules implementation.  Apologies if I am posting in the wrong place... 
so good bad or otherwise here goes:

+-------------------------------
With:

git push origin branchname

or

git push server2 branchname

I can push or pull from multiple servers so no problem as git supports this.

Now the problem with use of submodules

submodules are listed:

submodule.directory_to_
checkout/proj1_dir.url=https://git.someserver1/git/proj1_dir 
<https://git.someserver1/git/proj1_dir>

but if say I want to pull from some server 2 and do a

git submodule update --init --recursive

what I would get is from someserver1 not someserver2 as there is no 
"origin" support for submodules.  Is this correct?  If so can origin 
support be added to submodules?
+-------------------------------

So above was post from google group.  Maybe above is enough to explain 
the problem that can result, but if not here is a discussion as to why 
this can be confusing resulting to pushing or pulling from the incorrect 
server.

Lets say projects starts at origin on https://server0.org. Project is 
then brought in house to server https://indhouse.corp by developer A.

Developer A then changes the submodule projects to point to indhouse and 
changes submodules in super project to point to indhouse so everything 
is great.

Then Developer B clones from indhouse makes changes to submodule1 and 
submodule1 and pushes them to indhouse.  Dev A tells Dev B hey thoes 
changes are great why don't you push to public server0 so every one can 
get thoes changes.  Dev B then git push origin branch_name on submodule1 
and push origin on submodule 2 and superproject.  And everything is 
great ... right?

Yes by now those who know git know what dev B  forgot or more to the 
point what git does not support in a "clean" way.  For those who don't 
enter the life of dev C

So dev C clones from server0 and performs a git submodule update --init 
--recursive.  Now Dev C is on the www and can't see indhouse.corp and 
... kerpow... Dev B and Dev C just experienced one of the many SW mines 
on the battlefield.

I ask that git devs first see if I am correct with this assessment as I 
could be wrong... maybe there is a way of doing this... and if not add a 
feature to git to handle submodules and multiple origins cleanly.... and 
yes beating dev B with rubber chicken might be a solution though I am 
looking for a slightly better option.