Livebook (Mix.Error) Could not find an SCM for dependency

Elixir Framework Forums Livebook Forum
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1

I deployed Livebook with a docker image. (livebook/livebook:0.8.0)

When I try to install any package, I get an error that Hex is not available.

Mix.install([
  {:tesla, "~> 1.5"}
])

Error

Could not find Hex, which is needed to build dependency :tesla
** (Mix.Error) Could not find an SCM for dependency :tesla from Mix.InstallProject
    (mix 1.14.2) lib/mix.ex:513: Mix.raise/2
    (mix 1.14.2) lib/mix/dep/loader.ex:195: Mix.Dep.Loader.with_scm_and_app/4
    (mix 1.14.2) lib/mix/dep/loader.ex:141: Mix.Dep.Loader.to_dep/3
    (elixir 1.14.2) lib/enum.ex:1658: Enum."-map/2-lists^map/1-0-"/2
    (mix 1.14.2) lib/mix/dep/loader.ex:358: Mix.Dep.Loader.mix_children/2
    (mix 1.14.2) lib/mix/dep/loader.ex:18: Mix.Dep.Loader.children/0
    (mix 1.14.2) lib/mix/dep/converger.ex:80: Mix.Dep.Converger.all/4
    (mix 1.14.2) lib/mix/dep/converger.ex:74: Mix.Dep.Converger.converge/4

What could be the problem?

2

For some reason it is not finding Hex, but it should be part of the image.

3

Yes, I’m wondering what could have caused it. (maybe the volume mounts I did in the past, overwrote some hex installations?)

I went into the container, ran mix local.hex and then the livebook could install packages again.

1 Like
4

I ran into the same issue.

I ran this docker-compose,

services:
  livebook:
    image: livebook/livebook:latest-cuda11.8
    volumes:
      - ./notebooks:/home/livebook
    ports:
      - 8080:8080
      - 8081:8081
    pull_policy: always

opened LiveBook in my browser, imported the nx bumblebee example notebook, and tried to run the setup cell, but mix and rebar3 could not be found. I attached a shell to the container and ran mix local.hex and mix local.rebar after which the setup cell ran and all dependencies were installed successfully.

5

I wonder if it is something user specific? Elixir installs those for the current user and maybe Docker is running on a different user than the one who built it?

Good news is that Elixir will automatically install rebar and hex on Mix.install/2 in the next version, so this should no longer happen.

3 Likes