Don't assume Plutos deps are available from toplevel

[fredrikekre]

Running Julia with a custom load path doesn't work since Pluto assumes that it can load stdlibs from toplevel.

[fonsp]

If the stdlibs (listed here) aren't available to the runner process, then is there any way for us to load them anyways? Otherwise a custom load path is just not supported.

[fredrikekre]

You can presumably load them from the Pluto namespace (see e.g. JuliaLang/IJulia.jl#951)

[fonsp]

Pluto isn't loaded on the notebook process (Distributed process), it only loads one file, which imports the stdlibs: https://github.com/fonsp/Pluto.jl/blob/master/src/runner/PlutoRunner.jl

[fonsp]

(I don’t know how to fix this. Does not seem like a priority though.)

[fonsp]

@Roger-luo any ideas?

[Roger-luo]

I guess the solution is to let Pluto workspace runner use a Pluto specific environment to launch processes, then each process will own their own project? I'm not sure if I understand the problem correctly tho @fredrikekre

[KristofferC]

You cannot really start a new process and import a bunch of packages at the top level, the environment system doesn't work like that. Starting a new process, importing Pluto in it, and accessing everything from that (Pluto.XXX) would be the correct way according to how the environment system works. The user has added and loaded Pluto, and that is the only thing you can ensure can be loaded.

[fonsp]

Thanks everyone!

[fonsp]

(note to self/contributors)

I was able to reproduce it like so:

fons@woof:~$ julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.5.0-rc1.0 (2020-06-26)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

(@v1.5) pkg> activate --temp
 Activating new environment at `/tmp/jl_a0cvvq/Project.toml`

(jl_a0cvvq) pkg> dev /home/fons/Pluto.jl
...

julia> LOAD_PATH
3-element Array{String,1}:
 "@"
 "@v#.#"
 "@stdlib"

julia> deleteat!(LOAD_PATH, 2)
2-element Array{String,1}:
 "@"
 "@stdlib"

julia> deleteat!(LOAD_PATH, 2)
1-element Array{String,1}:
 "@"

julia> import Pluto; Pluto.run()

this gave:

[fonsp]

Fixed in 82ed697 😀