Hello,
Based on the README at https://github.com/haskell/docker-haskell, it looks
like this image does not have GHCup installed on it. It probably should. Do
you think you could contribute such a thing?
The repo is also looking for maintainers:
https://github.com/haskell/docker-haskell/issues/72
I myself may take an interest in eventually contributing to the repo in my
HF DevOps role, but I won't have time in the near future.
On Sun, 23 Jul 2023 at 21:33, Han Joosten
Hi Cafe,
I am trying to set up a useful development container for an open source project I am working on. I have created an image on top of the official Haskell image, expecting a proper installation of ghcup, cabal, stack and hls. The Dockerfile looks like this:
FROM haskell:8.10
ARG USERNAME=vscode
ENV USERNAME=${USERNAME} \ USER_UID=1000 \ USER_GID=1000 \ DEBIAN_FRONTEND=noninteractive \ LANG=C.UTF8 \ WDIR=/home/${USERNAME}
RUN apt-get update && \ apt-get upgrade -y && \ apt-get install -y git
RUN groupadd --gid $USER_GID $USERNAME && \ useradd -ms /bin/bash -K MAIL_DIR=/dev/null --uid $USER_UID --gid $USER_GID -m $USERNAME && \ mkdir -p /etc/sudoers.d && \ echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME && \ chmod 0440 /etc/sudoers.d/$USERNAME
USER ${USER_UID}:${USER_GID}
WORKDIR ${WDIR}
RUN stack update
# Add just the .cabal file to capture dependencies COPY ./package.yaml ${WDIR}/package.yaml COPY ./stack.yaml ${WDIR}/stack.yaml
# Docker will cache this command as a layer, freeing us up to # modify source code without re-installing dependencies # (unless one of the copied files changes!) RUN stack build --only-dependencies -j4
COPY . ${WDIR}
ENV DEBIAN_FRONTEND=dialog
ENTRYPOINT ["/bin/bash"]
The above image is built and pushed to dockerhub. Then, in the vscode project, I have a .devcontainer directory with the following Dockerfile:
FROM ampersandtarski/ampersand-devcontainer:latest
ENV DEBIAN_FRONTEND=dialog
ENTRYPOINT ["/bin/bash"]
The idea is that all the building of the dependencies is already done in the first image. That takes a lot of time, so this is supposed to be a great timesaver (though the image itself is huge). However, when I open the project inside the container, I get the following error: [image: image.png]
If I reload the window, I get the following errors: [image: image.png]
Long story short, I am not sure how to use the official Haskell image for development in my project. I must be missing something. I have been trying lots of things, but without succes. I hope it is possible to have an image built on top of the official Haskell file that contains all prebuilt dependencies of my project. Are my expectations realistic? If so, what am I missing? Any help is much appreciated.
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