Hey Guix.

I've been thinking lately it would be convenient to create certain uniquely 
named execution environments on my machine. For example, I might have one set 
up with dependencies for my Python webapp & environment variables set to 
autoconnect to a Postgres server. I might have another that's got test 
dependencies and is containerized, such that it can only access the network & 
not the rest of my filesystem. Suppose I name these two "webapp" and "test" 
respectively.

I picture running eg `guix env @webapp -- uvicorn main:app` to start my server, 
then `guix env @test -- pytest` to run my tests.

I might write a wrapper in some scripting language that sets up this kind of 
system. Would anybody else be interested in using such a thing? Would it make 
sense to integrate this capability into Guix itself?

Ryan

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