Mix task stopped working with Mix.Shell.cmd/2 is undefined…

[ulbrich]

Hi,

I love edib as it produces the smallest possible Docker images, but it stopped working with the following exception after I switched to a more recent version of Elixir:

| $> docker run --rm  -v "src/whatever:/source:ro" -v "src/whatever/tarballs:/stage/tarballs:rw"  -e MIX_ENV=prod edib/edib-tool:1.6.0
==> Creating artifact (might take a while) ...
** (UndefinedFunctionError) function Mix.Shell.cmd/2 is undefined or private. Did you mean one of:
    * cmd/3

Could you please have a look? I don't understand how I can run mix from a local copy of the source… 😇

Best,
Jan

[asaaki]

Can you give some insights on what setup you use? (Elixir/Mix version, OS, …).

AFAIK minor version bumps in Elixir (still) do cause incompatibilities, as the API changes and modules/functions get deprecated or change their behaviour.

(I suspect that the usage of Mix.Shell.cmd/2 is discouraged anyway.)

[ulbrich]

Sorry for this. I'm using ASDF to install and currently I'm using Erlang 20.1, Elixir 1.6.0 and Node.js 8.8.1 in this project. Thanks!

[antonpetkoff]

I have the same problem. I "fixed" it by downgrading elixir from 1.6.0 to 1.5.2.

[wizza-smile]

it's fixed in Elixir 1.6.6!