Get rid of impure mode about devenv HOT 8 OPEN

How about also avoid --impure when using flake? See #745 (comment)

from devenv.

It is possible to set DEVENV_ROOT to support pure mode
See #706, #566 and #583

from devenv.

Why do we need plain Nix expressions as flake inputs? Why not just generate a flake that contains current environment variables, including PWD, then just pass --override-input to use the generated flake.

from devenv.

For devenv we can do that, but not for the flakes integration.

from devenv.

How about using --redirect:

nix develop --redirect .#devenv-root .

from devenv.

I think the current impure devenv.root is a dangerous design when packing images via nix2container, because the image content could depend on devenv.root and reference to non-existing directory at runtime.

from devenv.

Ideally, there should be a perWorkingDirectory submodule under devenv, where we can access root. Environment variables that contain abstract paths should be configured under devent.perWorkingDirectory.env, instead of devent.env

from devenv.

In #745 we now generate PWD instead of using --impure when using devenv cli.

from devenv.