wrapper for running commands in docker containers

_docker_wrapper

#!/bin/bash

# usage: _docker_wrapper [--root] image command

user="--user=${UID}"
if [[ "$1" == "--root" ]]; then
    user="--user=root"
    shift
fi

readonly image="$1"
shift
readonly container="${image//[\/:.]/_}_container"

readonly running="$(docker inspect --format="{{ .State.Running }}" "$container" 2>/dev/null)"
[[ -z "$running" ]] \
    && docker run \
        -d \
        -e "HOME=$HOME" \
        --name "$container" \
        -v /etc/passwd:/etc/passwd:ro \
        -v /etc/group:/etc/group:ro \
        -v "${HOME}:${HOME}" \
        -u ${UID}:${GROUPS[0]} \
        "$image" \
        /bin/sh -c "while true; do sleep 100000; done" \
        >/dev/null
[[ "$running" == "false" ]] \
    && docker start "$container" >/dev/null

tty="--tty=false"
if [[ -t 0 && -t 1 ]]; then
    tty="--tty=true"
fi

exec docker exec -i "$tty" "$user" "$container" /bin/sh -c "cd \"${PWD}\"; exec \$0 \"\$@\"" "$@"