initial copy of docker for cpp project

Author: arnemertz

docker/Dockerfile

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+FROM ubuntu:20.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get -y dist-upgrade && apt-get -y install --fix-missing \
+  binutils \
+  build-essential \
+  bzip2 \
+  ccache \
+  clang-format \
+  cmake \
+  curl \
+  gdb \
+  gdbserver \
+  git \
+  locales \
+  python \
+  python3-pip \
+  rsync \
+  ruby \
+  shellcheck \
+  ssh \
+  sudo \
+  tar \
+  valgrind \
+  vim \
+  && apt-get autoremove -y && apt-get clean
+
+RUN locale-gen en_US.utf8 en_GB.utf8 de_DE.utf8 && update-locale
+
+RUN groupadd -g 1000 dev && \
+  useradd -m -u 1000 -g 1000 -d /home/dev -s /bin/bash dev && \
+  usermod -a -G adm,cdrom,sudo,dip,plugdev dev && \
+  echo 'dev:dev' | chpasswd && \
+  echo "dev   ALL=(ALL:ALL) ALL" >> /etc/sudoers
+
+# fix "Missing privilege separation directory" error in SSHD
+# see: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/45234
+RUN mkdir /var/run/sshd && chmod 0755 /var/run/sshd
+
+COPY ccache.conf /etc/.
+
+USER dev
+WORKDIR /home/dev
+
+RUN sed -i 's/\\h/docker/;s/01;32m/01;33m/' /home/dev/.bashrc
+
+RUN mkdir /home/dev/git

docker/README.md

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+:bangbang: Very much work in progress!
+
+# The container
+
+## Building
+
+`./build-image.sh`
+
+## Starting
+
+`docker-compose up -d`
+
+## Entering
+
+- Via ssh: `ssh dev@localhost -p 2222` , password is `dev`
+- Via docker exec: `docker exec -i -t -u dev:dev cpp_docker_env bash`
+
+## Stopping
+
+`docker-compose down`
+
+
+# Working on projects
+
+The user for the Docker container is `dev`.
+The compose file maps `~/git` on the host machine to `/home/dev/git` in the contianer, so I suggest that you check out your project there.
+
+
+
+
+
+

docker/build-image.sh

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+#!/bin/bash -e
+
+DOCKER_BUILDKIT=1 docker build -t cppenv:latest .

docker/ccache.conf

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+max_size = 20.0G

docker/cpp-docker

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+#! /bin/bash
+CONTAINER=cpp_docker_env
+WORKDIR=$(pwd)
+
+if ! /usr/bin/docker ps | grep "${CONTAINER}" > /dev/null; then
+  docker-compose up -d
+fi
+
+if [ $# -ne 0 ]; then
+  docker exec -i -t -u dev:dev "${CONTAINER}" bash -c "if [ -d \"${WORKDIR}\" ]; then cd ${WORKDIR}; fi; $*"
+else
+  # (The shell is interactive if bash is called without arguments :)
+  docker exec -i -t -u dev:dev "${CONTAINER}" bash 
+fi

docker/docker-compose.yml

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+version: '3'
+
+services:
+  ssh:
+    security_opt: # options needed for gdb debugging
+      - seccomp:unconfined
+      - apparmor:unconfined
+    cap_add:
+      - SYS_PTRACE
+    container_name: cpp_docker_env
+    image: cppenv:latest
+    environment:
+        - TERM=xterm-256color # For a colored Terminal
+        - SSH_AUTH_SOCK=/ssh-agent
+    volumes:
+        - ${SSH_AUTH_SOCK}:/ssh-agent # Forward local machine SSH to docker
+        - ${HOME}/.ssh/known_hosts:/home/dev/.ssh/known_hosts # If the host trusts, we shall trust as well.
+        - ${HOME}/.ssh/config:/home/dev/.ssh/config
+        - ${HOME}/.gitconfig:/home/dev/.gitconfig
+        - ${HOME}/git:/home/dev/git
+    command: /usr/sbin/sshd -D
+    user: root
+    network_mode: "bridge"
+    ports:
+      - "2222:22"
+    privileged: true
+    hostname: cpp_docker_env