devcontainer features dependencies overrides Docker commands

Question

I am trying to configure a new Rails application using devcontainer and this is my Dockerfile at .devcontainer file:

# Make sure RUBY_VERSION matches the Ruby version in .ruby-version
ARG RUBY_VERSION=3.4.1
FROM ghcr.io/rails/devcontainer/images/ruby:$RUBY_VERSION

WORKDIR /workspaces/decode

RUN sh -c "$(wget -O- https://github.com/deluan/zsh-in-docker/releases/download/v1.2.0/zsh-in-docker.sh)" -- \
    -t https://github.com/romkatv/powerlevel10k \
    -p https://github.com/zsh-users/zsh-autosuggestions \
    -p https://github.com/zsh-users/zsh-syntax-highlighting \
    -a 'export TERM=xterm-256color'

RUN echo '[[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh' >> ~/.zshrc

I'm used to use powerlevel10k along with zsh and to have some plugins and history as well. The problem is: Apparently this Dockerfile run this commands, but after the container build is complete, neither the powerlevel10k is setted as zsh theme nor the plugins are installed. I realize some features at my devcontainer.json install Zsh for default and probably is overriding. It's only a guess, though. Here is my devcontainer features:

"features": {
    "ghcr.io/devcontainers/features/github-cli:1": {},
    "ghcr.io/rails/devcontainer/features/activestorage": {},
    "ghcr.io/devcontainers/features/docker-outside-of-docker:1": {},
    "ghcr.io/rails/devcontainer/features/postgres-client": {}
  },

I am trying for days to configure the powerlevel10k and no success. I tried to place powerlevel10k as a feature inside my devcontainer.json, but it didn't work either. If I tried to ran the commands from Dockerfile after the container is builded, evertything works.

According to the docs powerlevel10k is the default so that them seems unnecessary. For the plugins maybe try adding the git plugin first e.g. -p git — engineersmnky
– engineersmnky, Commented Feb 21 at 21:27
Oh, thanks, I will remove the powerlevel10k plugin then, but the git is unnecessary, since the image install for itself. Also, as presented, both the commands RUN at the Dockerfile aren't persisting anyway — Isabela Porto
– Isabela Porto, Commented Feb 21 at 21:39

Isabela Porto · Accepted Answer · 2025-02-26 16:12:30Z

So, If for anyone who got the same problem as me, here how I got to work:

I have written the following commands to a bin/setup (autogenerated file by Rails).

puts "Installing zsh, plugins and its theme..."

# Executar comandos bash dentro do Ruby
system <<-BASH
  sh -c "$(wget -O- https://github.com/deluan/zsh-in-docker/releases/download/v1.2.1/zsh-in-docker.sh)" -- \
      -p git \
      -p https://github.com/zsh-users/zsh-autosuggestions \
      -p https://github.com/zsh-users/zsh-syntax-highlighting \
      -a 'export TERM=xterm-256color'

  echo 'DISABLE_AUTO_UPDATE=true' >> ~/.zshrc
  echo 'DISABLE_UPDATE_PROMPT=true' >> ~/.zshrc
  echo '[[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh' >> ~/.zshrc
  echo 'eval "$(rbenv init -)"' >> ~/.zshrc
BASH

puts "Zsh configuration complete!"

This file is executed through the "postCreateCommand": "bin/setup --skip-server" at the end of the devcontainer.json file. Also I have my .zsh_history and .pd10k at a folder .docker/zsh inside my project to keep the history and the pd10k configuration and the following code inside my compose.yaml:

volumes:
      - ..:/workspaces/project-name:cached
      - ../.docker/zsh/powerlevel10k/.p10k.zsh:/home/vscode/.p10k.zsh:delegated
      - ../.docker/zsh/history/.zsh_history:/home/vscode/.zsh_history:delegated

Its both at .gitignore so each person has its own powerlevel10k configuration and zsh history. That it is!

Things that I also tried:

To use the zsh-plugins devcontainer plugin as follows:

"ghcr.io/devcontainers-extra/features/zsh-plugins:0": {
  plugins: "zsh-autosuggestions zsh-syntax-highlighting",
  omzPlugins: "ttps://github.com/zsh-users/zsh-autosuggestions.git https://github.com/zsh-users/zsh-syntax-highlighting.git"
}

And it also worked great! I would just place as last feature just to be sure.

What it didn't work:

To use the devcontainer feature powerlevel10k. It looks like the feature wasn't even there.
To use the devcontainer feature zsh and define its theme as "powerlevel10k/powerlevel10k" and plugins as "zsh-autosuggestions zsh-syntax-highlighting". The plugins weren't installed and neither the powerlevel10k theme. But at least it updated the ~/.zshrc file.

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