Re: Fast `guix environment --container' switch

[Pierre Neidhardt]

`guix environment` incurs an overhead:

--8<---------------cut here---------------start------------->8---
time /gnu/store/a462kby1q51ndvxdv3b6p0rsixxrgx1h-hello-2.10/bin/hello
Hello, world!

real    0m0.002s
user    0m0.002s
sys     0m0.000s
--8<---------------cut here---------------end--------------->8---

--8<---------------cut here---------------start------------->8---
$ time guix environment --ad-hoc hello -- hello
Hello, world!

real    0m0.921s
user    0m1.003s
sys     0m0.091s
--8<---------------cut here---------------end--------------->8---

It's possible to bypass this overhead by using --root:

--8<---------------cut here---------------start------------->8---
$ guix environment --ad-hoc hello --root=foo
[env]$ exit

$ source foo/etc/profile && time hello
Hello, world!

real    0m0.003s
user    0m0.003s
sys     0m0.000s
--8<---------------cut here---------------end--------------->8---

The above `source' is of course not containerized.

So is it possible to use a similar trick to run something containerized
"instantly", i.e.  with less than, say, 100ms overhead?

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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