shell-docker.sh

#!/bin/bash
function docker_run_shell {
        NAME=$1
        DOCKERFILE=$2

        # docker needs a few libraries, but not all - essential libs here
        BIND_LIBS=`ldd /usr/bin/docker | grep /lib/ | awk '{print $3}' | egrep '(apparmor|libseccomp|libdevmap|libsystemd-journal|libcgmanager.so.0|libnih.so.1|libnih-dbus.so.1|libdbus-1.so.3|libgcrypt.so.11)'`
        ARGS=""
        for LIB in $BIND_LIBS; do
                ARGS="$ARGS -v $LIB:$LIB:ro"
        done

        ARGS="$ARGS -v /var/run/docker.sock:/run/docker.sock -v $(which docker):/bin/docker:ro"

        # pass ssh agent
        if [ ! -z "$SSH_AUTH_SOCK" ]; then
                ARGS="$ARGS -v $(dirname $SSH_AUTH_SOCK):$(dirname $SSH_AUTH_SOCK) -e SSH_AUTH_SOCK=$SSH_AUTH_SOCK"
        fi

        docker run -it --net=party -w /root \
                -h $NAME --name $NAME \
                $ARGS \
                -e LANG=$LANG -e LANGUAGE:$LANGUAGE \
                $DOCKERFILE /bin/bash
        echo "Commiting changes to $NAME, please wait..."
        docker ps --filter="name=$NAME" -a -q | xargs -n1 -I {} docker commit {} $NAME
        echo "Deleting container after us."
        docker rm -f $NAME
        echo "Done."
}

function docker_attach_shell {
        CONTAINER=$1
        echo "Attaching a bash session to $CONTAINER..."
        docker exec -it $CONTAINER /bin/bash
}

function give_shell {
        NAME=$1
        RUNNING=$(docker inspect --format="{{ .State.Running }}" $NAME 2> /dev/null)
        if [[ "$RUNNING" == "true" ]]; then
                # attach a shell with docker exec
                docker_attach_shell $NAME
        else
                FRESH_START="debian:jessie"
                if [[ "$(docker images -q $NAME 2> /dev/null)" == "" ]]; then
                        # start a clean container
                        echo "Spawning $NAME from scratch"
                        docker_run_shell $NAME $FRESH_START
                else
                        # start from an existing image
                        echo "Starting $NAME from saved copy"
                        docker_run_shell $NAME $NAME
                fi
        fi
}

NAME="shell-$LOGNAME"

function show_menus {
        echo "---------------------"
        echo
        echo "1. Enter docker shell ($NAME)"
        echo "2. Drop to system shell (host: `uname -n`)"
        echo
}

function read_options {
        local choice
        read -p "Enter choice: " choice
        case $choice in
                1) give_shell $NAME ;;
                *) exit ;;
        esac
}

if [ -z "$SSH_AUTH_SOCK" ]; then
        echo "---------------------"
        printf "#\n# Warning: SSH Agent not forwarded, auth_sock missing\n#\n"
fi

while true
do
        show_menus
        read_options
done

Posted in: "How to live inside a docker container",
https://scene-si.org/2016/04/01/how-to-live-inside-a-docker-container/