Docker Proxy Environment for Systemd

docker-proxy-env.sh

#!/bin/sh
cmd=${1}
docker_proxy_file="/etc/systemd/system/docker.service.d/http-proxy.conf"

# Installations instructions:
# sudo curl https://gist.githubusercontent.com/pascencio/c0b391832a733a9b0fedd1343cadeaab/raw/c38e2f43956668f82c0345aaaa927dfcea3c759e/docker-proxy-env.sh -o /usr/bin/docker-proxy-env && sudo chmod +x /usr/bin/docker-proxy-env

reload_docker(){
    systemctl daemon-reload
    systemctl restart docker
}

is_root(){
    ID=$(id -u)
    if [ ${ID} != 0 ] ;
    then
        echo "You must execute this command with root"
        exit 1
    fi
}

set_proxy_on_file(){
    if [ ! -d /etc/systemd/system/docker.service.d ] ;
    then
	mkdir -p /etc/systemd/system/docker.service.d
    touch ${docker_proxy_file}
    fi
    docker_proxy=${1}
    docker_no_proxy=${2}
    echo "[Service]" > ${docker_proxy_file}
    echo "Environment=\"HTTP_PROXY=${docker_proxy}\" \"HTTPS_PROXY=${docker_proxy}\" \"http_proxy=${docker_proxy}\" \"https_proxy=${docker_proxy}\" \"no_proxy=${docker_no_proxy}\" \"NO_PROXY=${docker_no_proxy}\"" >> ${docker_proxy_file}
    echo "" >> ${docker_proxy_file}
}

set_proxy(){
    is_root
    
    read -p "Proxy scheme (http): " scheme
    read -p "Proxy username: " username
    read -p "Proxy password: " password
    read -p "Proxy host: " host

    if [ "${host}X" = "X" ];
    then
        echo "You must set a host"
        exit 1
    fi
    
    read -p "Proxy port: " port
    
    if [ "${port}X" = "X" ];
    then
        echo "You must set a port"
        exit 1
    fi
    
    read -p "No Proxy hosts: " no_proxy

    login="${username}:${password}"
    
    if [ login != ":" ];
    then
        login="${login}@"
    else
        login=""
    fi

    if [ "${scheme}http" != "http" ];
    then
        docker_proxy="${scheme}://${host}:${port}/"
    else
        docker_proxy="http://${host}:${port}/"
    fi

    set_proxy_on_file ${docker_proxy} ${no_proxy}

    reload_docker
}

unset_proxy(){

    is_root

    set_proxy_on_file ""

    reload_docker
}

print_help()    
{
    echo "Invalid argument. Usage: docker-proxy-env <argument>"
    echo "Arguments:"
    echo "      set: Load proxy settings"
    echo "      unset: Clear proxy settings"
}

case $cmd in
    set)
        set_proxy
        ;;
    unset)
        unset_proxy
        ;;
    *)
        print_help
        ;;
esac

exit 0