Simple dockerfile to run opencode in a sandbox

Dockerfile

FROM ubuntu:24.04

ARG UID=1000
ARG GID=1000
ARG USERNAME=dev

RUN apt update && apt dist-upgrade -y
RUN apt install -y \
    adduser \
    curl \
    less \
    vim

# Creates group if not exists
RUN if ! getent group ${GID} >/dev/null; then \
        groupadd -g ${GID} ${USERNAME}; \
    fi

# Creates user if not exits
RUN if ! getent passwd ${UID} >/dev/null; then \
        useradd -m -u ${UID} -g ${GID} -s /bin/bash ${USERNAME}; \
    fi

# If UID exist get real username
RUN REAL_USERNAME=$(getent passwd ${UID} | cut -d: -f1) && \
    echo "Real user detected: ${REAL_USERNAME}" && \
    echo "export PS1='[dev-container]\\u@\\h:\\w\\$ '" >> /home/${REAL_USERNAME}/.bashrc


USER ${UID}:${GID}
RUN curl -fsSL https://opencode.ai/install | bash

WORKDIR /app
CMD ["/bin/bash"]

This can be build with:

docker build . \
   --build-arg UID=$(id -u) \
   --build-arg GID=$(id -g) \
   -t opencode