docker_purge.sh

#!/bin/bash

# Stops and removes docker containers, along with its related
# volumes and custom networks. If no custom networks are being used,
# might be better to use "docker rm -v <cont>" instead

usage(){
    echo -e "\n  Usage:  $(basename $0) CONTAINER [CONTAINER...]\n"
    echo -e "  Remove one or more containers, along with its assigned volumes and network interfaces\n"
    exit 1
}

inarr(){
    v=$1

    shift
    declare -a arr
    while [ $# -gt 0 ];do
        arr[${#arr[@]}]=$1
        shift
    done

    for a in "${arr[@]}"; do
        if [ "$v" == "$a" ]; then
            # echo found
            return 0
        fi
    done

    return 1
}

if [ $# -lt 1 ]; then
    usage
fi

declare -a conts
while [ $# -gt 0 ]; do
    conts[${#conts[@]}]=$1
    shift
done

all_conts=($(docker ps -aq --format="{{.ID}} {{.Names}}"))

for cont in ${conts[@]}; do
    if ( ! inarr $cont "${all_conts[@]}" ); then
        echo "$cont not valid"
        exit 1
    fi
done

volfmt='{{range $_, $v := .Mounts }} {{($v).Name}}{{end}}'
netfmt='{{range $k, $_ := .NetworkSettings.Networks }} {{$k}}{{end}}'
runfmt='{{.State.Running}}'

echo "Gathering info"
uvols=()
unets=()
for cont in ${conts[@]}; do
    echo "  $cont"

    running=$(docker inspect --format="$runfmt" $cont)
    echo "   - Running: $running"

    vols=($(docker inspect --format="$volfmt" $cont))
    echo "   - Volumes:"
    for v in ${vols[@]}; do
        echo "       $v"
    done
    uvols=($(echo "${uvols[@]} ${vols[@]}" | tr " " "\n"|sort|uniq|tr "\n" " " ))

    nets=($(docker inspect --format="$netfmt" $cont))
    echo "   - Networks:"
    for n in ${nets[@]}; do
        echo "       $n"
    done
    unets=($(echo "${unets[@]} ${nets[@]}" | tr " " "\n"|sort|uniq|tr "\n" " " ))
done

echo
echo "Stopping containers..."
for cont in ${conts[@]}; do
    running=$(docker inspect --format="$runfmt" $cont)
    if [ $running = 'true' ]; then
        echo "    Stopped $cont"
        docker stop $cont 1>/dev/null
    else
        echo "    $cont already stopped"
    fi
done

echo
echo "Removing containers..."
for cont in ${conts[@]}; do
    docker rm $cont 1> /dev/null
    echo "    $cont removed"
done

echo
echo "Removing volumes"
for v in ${uvols[@]}; do
    echo "    $v removed"
    docker volume rm $v 1> /dev/null
    # docker volume inspect $v
done

echo
echo "Removing networks"
for n in $unets; do

    if ( ! inarr $n 'bridge' 'none' 'host' ); then
        docker network rm $n 1> /dev/null
        echo "    $n removed"
    fi
done