simple docker-machine-based dev helper

docker-dev.sh

dev() {
    local machine_name
    local dir_name
    local proj_name
    local host
    local host_user
    local host_path
    local ssh_cmd
    if ! dev-setup
    then return $?
    fi

    if [ -z "$1" ]
    then echo "USAGE: dev <docker host command...>  # FROM A PROJECT DIRECTORY, DEV_DOCKER_MACHINE needs to be set, AFTER dev-init...!" 1>&2
         return 999
    fi

    echo "dev'ing $dir_name -- DO NOT make local file changes until this finishes!"
    while ! $ssh_cmd "$host_user@$host" "( mkdir -p $host_path && cd $host_path && sudo chown -R $host_user: . )"
    do sleep 3
    done
    while ! rsync -vrlptDz --del -e "$ssh_cmd" . "$host_user@$host:$host_path/"
    do sleep 3
    done

    $ssh_cmd "$host_user@$host" "( cd $host_path && $@ )" && \
        ( while ! rsync -vrlptDz --del -e "$ssh_cmd" "$host_user@$host:$host_path/" .; do sleep 3; done )
}

dev-tunnel() {
    local machine_name
    local dir_name
    local proj_name
    local host
    local host_user
    local host_path
    local ssh_cmd
    if ! dev-setup
    then return $?
    fi

    lport="${1:-8880}"
    svc="${2:-web}"
    port="${3:-80}"
    ip=$( docker-machine ssh "$machine_name" "( cd $host_path && sudo docker-compose -p $proj_name ps | grep _${svc}_ | cut -d' ' -f1 | xargs -n 1 sudo docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}} {{end}}' | cut -d' ' -f1 )" )  # TODO escape me, also, couldn't find a way to print the first element in map range (go templates!)
    if [ -z "$ip" ]
    then echo "Error getting the service's local IP, maybe dead." 1>&2
         return 3
    fi
    $ssh_cmd "$host_user@$host" -L "$lport:$ip:$port" -N
}

dev-setup() {  # NOTE aux
    machine_name="$DEV_DOCKER_MACHINE"
    if [ -z "$machine_name" ]
    then echo "export DEV_DOCKER_MACHINE=<your dev instance> # and pre-set zone somehow as well" 1>&2
         return 999
    fi
    dir_name="$( basename `pwd` )"
    proj_name="$DEV_PROJ_NAME"
    if [ -z "$proj_name" ]
    then if [ "`pwd`" == "$HOME" ]
         then echo "ERROR: to be run from some project directory" 1>&2
              return 999
         fi
         proj_name="$dir_name"
    fi
    host=`docker-machine url $machine_name | cut -d: -f2 | cut -c3-`
    host_user=${DEV_DOCKER_MACHINE_USER:-docker-user}
    host_path="/home/$host_user/proj/$dir_name"
    ssh_cmd="ssh -i ~/.docker/machine/machines/$machine_name/id_rsa -F /dev/null -o IdentitiesOnly=yes -o PasswordAuthentication=no -o CheckHostIP=no -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ConnectionAttempts=3 -o ConnectTimeout=10 -o ControlMaster=no -o ControlPath=none -p 22"
    # TODO?  -o BatchMode=yes
}

# NOTE docker-compose version is hard-coded to 1.19.0 (too lazy to be bothered)

dev-init() {
    local machine_name

    if [ -z "$DEV_DOCKER_MACHINE_OPTIONS" ]
    then echo "Error: DEV_DOCKER_MACHINE_OPTIONS needs to be set ('--driver ...' etc)" 1>&2
         return 999
    fi
    machine_name="$1"
    if [ -z "$machine_name" ]
    then echo "USAGE: dev-init <machine name>" 1>&2
    fi

    echo "INFO Booting the machine..." 1>&2
    while ! docker-machine create $DEV_DOCKER_MACHINE_OPTIONS "$machine_name"
    do docker-machine rm -f "$machine_name"
    done

    echo "INFO Installing docker* with apt..." 1>&2
    while ! docker-machine ssh "$machine_name" 'sudo bash -c "curl -L https://github.com/docker/compose/releases/download/1.19.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose && chmod +x /usr/local/bin/docker-compose"'
    do sleep 3
    done

    echo "INFO Setting up mail..." 1>&2
    while ! docker-machine ssh "$machine_name" 'curl https://gist.githubusercontent.com/costa/a325e7fdc5a803e1e5425fd36a784fe7/raw/cc88de0689cdf41c0dbba46195c9d38a73d83c48/gcloud-machine-sendgrid-mail-setup.sh | sudo sh'
    do sleep 3
    done

    echo "INFO Some final touches..." 1>&2
    while ! docker-machine ssh "$machine_name" mkdir proj
    do sleep 3
    done
    while ! docker-machine ssh $machine_name 'echo "vm.max_map_count=262144" | sudo tee -a /etc/sysctl.conf'
    do sleep 3
    done

    # TODO swapppp
    # sudo fallocate -l 30G /swapfile
    # sudo chmod 600 /swapfile
    # sudo mkswap /swapfile
    # sudo swapon /swapfile
    # echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab

    echo "Very good, now (recommended) $ echo 'export DEV_DOCKER_MACHINE=$machine_name' >> ~/.bashrc"
    echo "and (very recommended) $ docker-machine ssh $machine_name 'sudo apt-get remove --auto-remove -y sshguard; sudo reboot'"
}

dev-once() {
    local machine_name

    machine_name=test-`date +"%Y%m%d%H%M%S"`-dev
    dev-init $machine_name && \
        DEV_DOCKER_MACHINE="$machine_name" dev "bash -xc '$*'" && docker-machine rm -f $machine_name
}