FROM golang:1.18.5

# Defining a non privileged user to run the app
# which has the benefit that one can define the UID/GID of this new user
# so volume mapping of a local directory to the container with the same
# ids works with no ownership/permission issues
ENV PROJECT_NAME=catchy-cat
ENV PROJECT_USER=${PROJECT_NAME}
ENV PROJECT_USER_UID=1000
ENV PROJECT_USER_GID=1000
ENV PROJECT_USER_HOME=/home/${PROJECT_USER}
ENV PROJECT_USER_APP_HOME=/go/src/github.com/rodley82/${PROJECT_NAME}

RUN groupadd -r --gid ${PROJECT_USER_GID} ${PROJECT_USER}
RUN useradd --system --no-log-init --uid ${PROJECT_USER_UID} --gid ${PROJECT_USER_GID} --home-dir ${PROJECT_USER_HOME} --create-home --shell /bin/bash ${PROJECT_USER}

RUN mkdir -p ${PROJECT_USER_APP_HOME} && chown -R ${PROJECT_USER}:${PROJECT_USER} ${PROJECT_USER_APP_HOME}

# TODO Just for dev
# RUN apt update && apt install -y tmux

USER ${PROJECT_USER}

ENV GO111MODULE on

# TODO Just for dev
# Only for development so we can later use reflex -r '\.go$' make all
# RUN go install github.com/cespare/reflex@latest && \
#     go install github.com/go-delve/delve/cmd/dlv@latest && \

WORKDIR ${PROJECT_USER_APP_HOME}
COPY --chown=${PROJECT_USER}:${PROJECT_USER} go.mod ./
COPY --chown=${PROJECT_USER}:${PROJECT_USER} go.sum ./

RUN go mod download

COPY --chown=${PROJECT_USER}:${PROJECT_USER} *.go ./

RUN go build -o ${PROJECT_USER_APP_HOME}/${PROJECT_NAME}

# Now tell Docker what command to run when the container starts
CMD ["sh", "-c", "${PROJECT_USER_APP_HOME}/${PROJECT_NAME}"]