#!/usr/bin/env python3

docker_tools.py - Tools for building and using the Runestone Servers in Docker

This script provides a set of Docker-related command-line tools. Run docker-tools --help for details.

Design goals

  • Bootstrap (the init command): this script is designed to be downloaded then executed as a single file. In this case, bootstrap code downloads dependencies, the repo it belongs in, etc. This makes it easy to create a development or production environment from a fresh install of the host OS.

  • Multiple modes (the build command): this script builds two distinctly different containers.

    • Single-container: these commands creates a container designed to execute on a single server. The Dockerized applications associated with it include Jobe, Redis, and Postgres. A volume is used to persist data, such as updates to the server.

      • Production mode (the default): docker-tool build --single creates a container designed for production (which includes obtaining an HTTPS certificate).

      • Development mode: docker-tools build --single-dev creates a container supporting a development mode, which provides additional tools and installs the BookServer and Runestone Components from github, instead of from releases on PyPI.

    • Multi-container: docker-tools build --multi creates a container designed for cluster operation, when many instances of this container accept requests passed on by a load balancer. In this mode, no volumes are mounted; HTTPS certificates cannot be requested, since this is the responsibility of the load balancer.

  • Flexible: the build process supports a number of options to customize the build. Writing in Python provides the ability to support this complexity.

  • Minimal: this tool only contains functions specifically related to Docker. Tools which apply more generally reside in rsmanage - command-line tools for managing the Runestone server.

  • No loops: unlike earlier approaches, this script doesn’t cause the container to restart if something goes wrong. Instead, it catches all errors in a try/except block then stops executing so you can see what happened.

  • venv: all Python installs are placed in a virtual environment managed by Poetry.

Build approach

To build a container, this script walks through three steps:

  1. The first step occurs when this script is invoked from the terminal/command line, outside Docker. It does some preparation, then invokes the Docker build.

  2. Next, Docker invokes this script from the Dockerfile - create a container hosting the Runestone servers. This script installs everything it can.

  3. Finally, Docker invokes this when the container is run. On the first run, this script completes container configuration, then runs the servers. After that, it only runs the servers, since the first-run configuration step is time-consuming.

Since some files are built into the container in step 1 or run only once in step 2, simply editing a file in this repo may not update the file inside the container. Look through the source here to see which files this applies to.

Imports and bootstrap

These are listed in the order prescribed by PEP 8, with exceptions noted below.

There’s a fair amount of bootstrap code here to download and install required imports and their dependencies.

Standard library

import datetime
from enum import auto, Enum
import os
from pathlib import Path
import platform
import re
import subprocess
import sys
from time import sleep
from traceback import print_exc
from typing import Dict, Tuple
from textwrap import dedent

Local application bootstrap

Everything after this depends on Unix utilities. We can’t use is_win because we don’t know if ci_utils is available.

if sys.platform == "win32":
    sys.exit("ERROR: You must run this program in WSL/VirtualBox/VMWare/etc.")


True if we’re root.

        ["id", "-u"], capture_output=True, text=True, check=True
    == "0"

True if this script is running in a Python virtual environment.

IN_VENV = sys.prefix != sys.base_prefix

The working directory of this script.

wd = Path(__file__).resolve().parent

True if this script is executing from the Runestone repository; otherwise, we assume only this script was downloaded as a part of the bootstrap process.

IN_REPO = (wd / "nginx").is_dir()

Supporting functions

Check to see if a program is installed; if not, install it.

def check_install(

The command to run to check if the program is installed.

    check_cmd: str,

The name of the package containing this program.

    install_package: str,
) -> None:
    print(f"Checking for '{check_cmd}'...")
        subprocess.run(check_cmd, check=True, shell=True)
    except (subprocess.CalledProcessError, FileNotFoundError):
        print("Not found. Installing...")

Only run with sudo if we’re not root.

            ([] if IS_ROOT else ["sudo"])
            + [

We need curl for some (possibly missing) imports – make sure it’s installed.

def check_install_curl() -> None:
    check_install("curl --version", "curl")

Outside a venv, install locally.

def pip_user() -> str:
    return "" if IN_VENV else "--user"

Bootstrap ci_utils

Bootstrap check: if we’re not in the repo, do some tidying.

if not IN_REPO:
    print("Creating directory rsdocker/ to store all Runestone files.")
    wd = wd / "rsdocker"

Add this directory – which is where the ci_utils will be downloaded – to the path; otherwise, ci_utils won’t be found.


sys.path.append(str(wd / "../tests"))

This unused import triggers the script download if it’s not present. This only happens outside the container.

    import ci_utils  # noqa: F401
except ImportError:
    assert not os.environ.get("IN_DOCKER")
    print("Downloading supporting script ci_utils.py...")
from ci_utils import chdir, env, is_darwin, is_linux, pushd, xqt  # noqa: E402

Third-party bootstrap

This comes after importing ci_utils, since we use that to install click if necessary.

    import click
except ImportError:
    import site
    from importlib import reload

Ensure pip is installed before using it.

    check_install(f"{sys.executable} -m pip --version", "python3-pip")

    print("Installing Python dependencies...")

Outside a venv, install locally.

    user = " " if IN_VENV else "--user "
        f"{sys.executable} -m pip install {pip_user()} --upgrade pip",
        f"{sys.executable} -m pip install {pip_user()} --upgrade click",

If pip is upgraded, it won’t find click. Re-load sys.path to fix this.

    import click

Local application

When bootstrapping, this import fails. This is fine, since these commands require a working container before they’re usable.

    from docker_tools_misc import (
except ImportError:
    print("Note: this must be an initial install; additional commands missing.")

Global variables

Update the following versions regularly.

CHROMEDRIVER_VERSION = "103.0.5060.53"
WEB2PY_VERSION = "2.21.1"
XC16_VERSION = "xc16-v1.70-full-install-linux64-installer.run"
MPLABX_VERSION = "MPLABX-v6.00-linux-installer.tar"

These are sometimes not the same base name (depends on the MPLABX release).

MPLABX_SH_NAME = "MPLABX-v6.00-linux-installer.sh"


Create a series of subcommands for this CLI.

def cli() -> None:

Add the subcommands defined in docker_tools_misc.py - Misc CLI tools for Docker, if it’s available.

except NameError:

init command

    help="Clone RunestoneServer repo with USERNAME",
def init(
    clone_rs: str,
) -> None:

Install prereqs needed for all other commands available in this tool.

Did we add the current user to a group?

    did_group_add = False

True if running a Docker container requires use of sudo.

    docker_sudo = False

Ensure Docker is installed.

        xqt("docker --version")
    except subprocess.CalledProcessError as e:
        print(f"Unable to run docker: {e}")

Ensure the Docker Desktop is running if we’re running in WSL or OS X. On Windows, the docker command doesn’t exist when the Docker Desktop isn’t running.

        if (is_linux and "WSL" in Path("/proc/version").read_text()) or is_darwin:
                "ERROR: Docker Desktop not detected. You must install and run this\n"
                "before proceeding."

        print("Installing Docker...")
            "curl -fsSL https://get.docker.com -o get-docker.sh",
            "sudo sh ./get-docker.sh",
            "rm get-docker.sh",

Linux only: Ensure the user is in the docker group. This follows the Docker docs. Put this step here, instead of after the Docker install, for people who manually installed Docker but skipped this step.

    if is_linux:
        print("Checking to see if the current user is in the docker group...")
        if "docker" not in xqt("groups", capture_output=True, text=True).stdout:

Per the Docker docs, enable running Docker as a non-root user.

Ignore errors if the groupadd fails; the group may already exist.

            xqt("sudo groupadd docker", check=False)
            xqt("sudo usermod -a -G docker $USER")

Until group privileges to take effect, use sudo to run Docker.

            docker_sudo = True

The group add doesn’t take effect until the user logs out then back in. Work around it for now.

            did_group_add = True

Ensure the Docker Desktop is running if this is OS X. On OS X, the docker command exists, but can’t run the hello, world script. It also serves as a sanity check for the other platforms.

    print("Checking that Docker works...")
        xqt(f"{'sudo' if docker_sudo else ''} docker run hello-world")
    except subprocess.CalledProcessError as e:
            f"ERROR: Unable to execute docker run hello-world: {e}"
            + (
                    "Docker Desktop not detected or not working. You must install and run\n"
                    "this before proceeding."
                if is_darwin
                else ""

Make sure git’s installed.

        xqt("git --version")
    except Exception as e:
        print(f"Unable to run git: {e} Installing...")
        xqt("sudo apt install -y --no-install-recommends git")

Are we inside the Runestone repo?

    if not IN_REPO:
        change_dir = True

No, we must be running from a downloaded script. Clone the runestone repo.

        print("Didn't find the runestone repo. Cloning...")

Check if possible to clone RunestoneServer with Custom Repo

                f"export GIT_TERMINAL_PROMPT=0 && git clone https://github.com/{clone_rs}/RunestoneServer.git"
        except subprocess.CalledProcessError:

Exit script with Git Clone Error

                f"ERROR: Unable to clone RunestoneServer remote repository via User - {clone_rs}"

Make sure we’re in the root directory of the web2py repo.

        change_dir = False

Ensure the user is in the www-data group.

    print("Checking to see if the current user is in the www-data group...")
    if "www-data" not in xqt("groups", capture_output=True, text=True).stdout:
        if is_darwin:
                "sudo dscl . create /Groups/www-data",
                "sudo dscl . create /Groups/www-data gid 799",
                "sudo dseditgroup -o edit -a $USER -t user www-data",
                "sudo dscl . append /Groups/www-data GroupMembership $USER",
            xqt("sudo usermod -a -G www-data $USER")
        did_group_add = True

Provide server-related CLIs. While installing this sooner would be great, we can’t assume that the prereqs (the downloaded repo) are available.

    check_install(f"{sys.executable} -m pip --version", "python3-pip")

Note: Sometimes, OS X installs these into a place that’s not in the default $PATH, making the scripts docker-tools and rsmanage not work unless the user manually adds the path. Add the --verbose flag to the install commands below to see where the scripts are placed on OS X.

        f"{sys.executable} -m pip install {pip_user()} -e docker",
        f"{sys.executable} -m pip install {pip_user()} -e rsmanage",

Print these messages last; otherwise, it will be lost in all the build noise.

    if change_dir:
            "\n" + "*" * 80 + "\n"
            "Downloaded the RunestoneServer repo. You must \n"
            '"cd RunestoneServer" before running this script again.'
    if did_group_add:
            "\n" + "*" * 80 + "\n"
            "Added the current user to the www-data and/or docker group(s).\n"
            "You must reboot for this to take effect."

build command

class BuildConfiguration(Enum):
    MULTI = auto()
    SINGLE = auto()
    SINGLE_DEV = auto()

    def is_dev(self):
        return self is self.SINGLE_DEV

    def is_single(self):
        return self in (self.SINGLE, self.SINGLE_DEV)


Allow users to pass args directly to the underlying docker build command – see the click docs.

@click.argument("passthrough", nargs=-1, type=click.UNPROCESSED)

Define the build configuration.

    help="Build a worker image for multi-server production deployment.",
    help="Build an image for single-server production deployment.",
    help="Build an image for single-server development.",

Provide options for cloning from another repo.

    help="Clone all System components from repos with specified USERNAME",
    help="Clone BookServer repo with USERNAME",
    help="Clone RunestoneComponents repo with USERNAME",

Provide additional build options.

@click.option("--arm/--no-arm", default=False, help="Install the ARMv7 toolchain.")
    help="Install tools needed for development with the PIC24/dsPIC33 family of microcontrollers.",
@click.option("--rust/--no-rust", default=False, help="Install the Rust toolchain.")
@click.option("--tex/--no-tex", default=False, help="Install LaTeX and related tools.")
    help="Install the Icarus Verilog simulation tool.",
def build(
    passthrough: Tuple,
    build_config_name: str,
    clone_all: str,
    clone_bks: str,
    clone_rc: str,
    arm: bool,
    pic24: bool,
    rust: bool,
    tex: bool,
    verilog: bool,
) -> None:

When executed outside a Docker build, build a Docker container for the Runestone webservers.

PASSTHROUGH: These arguments are passed directly to the underlying “docker build” command. To pass options to this command, prefix this argument with “–”. For example, use “docker_tools.py build – -no-cache” instead of “docker_tools.py build -no-cache” (which produces an error).

WARNING: if the flag ‘-c / –clone-all’ is passed an argument, then it will override any other clone flags specified.

Inside a Docker build, install all dependencies as root.

    phase = env.IN_DOCKER
    build_config = BuildConfiguration[build_config_name]

Phase 0 – prepare then start the container build.

    if not phase:

Phase 1 – build the container.

    elif phase == "1":
        _build_phase_1(build_config, arm, pic24, rust, tex, verilog)

Phase 2 - run the startup script for container.

    if phase == "2":
        base_ready_text = dedent(
            This file reports the status of the Docker containerized

            The container is starting up...
            _build_phase_2_core(build_config, arm, pic24, rust, tex, verilog)
        except Exception:
        get_ready_file().write_text(base_ready_text + msg)

Notify listener user we’re done.

        print("=-=-= Runestone setup finished =-=-=")

If this script exits, then Docker re-runs it. So, loop forever.

        while True:

Flush now, so that text won’t stay hidden in Python’s buffers.


Phase 0: Prepare then start the container build

def _build_phase_0(
    passthrough: Tuple,
    build_config: BuildConfiguration,
    clone_all: str,
    clone_bks: str,
    clone_rc: str,
    arm: bool,
    pic24: bool,
    rust: bool,
    tex: bool,
    verilog: bool,
) -> None:

If the clone-all flag is set, override the other clone-xxx flags.

    if clone_all:
            "Warning: Clone-all flag was initialized and will override any other clone flag specified!",

Set each individual flag to the clone-all argument

        clone_bks = clone_all
        clone_rc = clone_all

Create the docker/.env if it doesn’t already exist. TODO: keep a dict of {file name, checksum} and save as JSON. Use this to detect if a file was hand-edited; if not, we can simply replace it.

    if not Path(".env").is_file():
        xqt("cp docker/.env.prototype .env")

Do the same for 1.py.

    one_py = Path("models/1.py")
    if not one_py.is_file():

    dc = Path("docker-compose.override.yml")
    if not build_config.is_single():

Remove this if it exists (probably from an earlier build without --multi). This file is only correct for --single(-dev) builds.


For single-server operation, include additional services. Define dev-only replacements for this file.

        d = {
            "DEV_MISC": dedent(
                # Set the base dedent; this defines column 0. The following section of the file should be indented by 2 tabs.
                        # Set up for VNC.
                            # I don't know how to correctly forward X11 traffic (see notes on VNC), so ignore the X11 ``DISPLAY`` outside the container.
                            DISPLAY: ":0"
                            # For VNC.
                            -   "5900:5900"
                            # For the CodeChat System (author toolkit)
                            -   "27377-27378:27377-27378"
            if build_config.is_dev()
            else "",
            "DEV_VOLUMES": dedent(
                # Set the base dedent; this defines column 0. The following section of the file should be indented by 3 tabs.
                            -   ../RunestoneComponents/:/srv/RunestoneComponents
                            -   ../BookServer/:/srv/BookServer
                            # To make Chrome happy.
                            -   /dev/shm:/dev/shm
                            -   /run/dbus/system_bus_socket:/run/dbus/system_bus_socket
            if build_config.is_dev()
            else "",
                # WARNING: this file is automatically generated and is overwritten on each invocation of ``docker-tools build``.
                version: "3"

                        restart: always
                            POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
                            POSTGRES_USER: ${POSTGRES_USER}
                            POSTGRES_DBNAME: ${POSTGRES_DBNAME}

                        image: redis
                        restart: always

                            # This must agree with ``$RUNESTONE_PATH`` in the `Dockerfile`. There's no easy way to share this automatically.
                            -   ./:/srv/web2py/applications/runestone
                            # For certbot, store certificates outside the (ephemeral) write layer.
                            -   ./docker/letsencrypt:/etc/letsencrypt
                        -   db
                        -   redis

    if build_config.is_dev():
        with pushd(".."):
            bks = Path("BookServer")
            if not bks.exists():
                print(f"Dev mode: since {bks} doesn't exist, cloning the BookServer...")
                if not clone_bks:
                        "ERROR: in development mode, you must provide\n"
                        "either --clone-all or --clone-bks."

Check if possible to clone BookServer with Custom Repo

                        f"export GIT_TERMINAL_PROMPT=0 && git clone https://github.com/{clone_bks}/BookServer.git"
                except subprocess.CalledProcessError:

Exit script with Git Clone Error

                        "ERROR: Unable to clone BookServer remote repository\n"
                        f"via user {clone_bks}."
            rsc = Path("RunestoneComponents")
            if not rsc.exists():
                    f"Dev mode: since {rsc} doesn't exist, cloning the Runestone Components..."
                if not clone_rc:
                        "ERROR: in development mode, you must provide\n"
                        "either --clone-all or --clone-rc."

Check if possible to clone RunestoneComponents with Custom Repo

                        f"export GIT_TERMINAL_PROMPT=0 && git clone https://github.com/{clone_rc}/RunestoneComponents.git"
                except subprocess.CalledProcessError:

Exit script with Git Clone Error

                        "ERROR: Unable to clone RunestoneComponents remote\n"
                        f"repository via user {clone_rc}."

Run the Docker build.

        f'ENABLE_BUILDKIT=1 docker build -t runestone/server . --build-arg DOCKER_BUILD_ARGS="{" ".join(sys.argv[1:])}" --progress plain {" ".join(passthrough)}'

Phase 1: install Runestone dependencies

This is run inside the Docker build, from the Dockerfile - create a container hosting the Runestone servers.

def _build_phase_1(
    build_config: bool,
    arm: bool,
    pic24: bool,
    rust: bool,
    tex: bool,
    verilog: bool,
    assert in_docker()

Set up apt correctly; include Postgres repo.

        "apt update",
        "apt install -y --no-install-recommends eatmydata lsb-release",
        """echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg main" | tee  /etc/apt/sources.list.d/pgdg.list""",
        "wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -",
        "apt update",
    apt_install = "eatmydata apt install -y --no-install-recommends"

This uses apt; run it after apt is set up.

    if build_config.is_dev():

Add in Chrome repo. Copied from https://tecadmin.net/setup-selenium-with-chromedriver-on-debian/. Unless we are on an ARM64 processor, then we will fall back to using chromium.

            "curl -sS -o - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -",
        if platform.uname().machine == "x86_64":
                "deb [arch=amd64]  http://dl.google.com/linux/chrome/deb/ stable main"
            browser = "google-chrome-stable"
            browser = "chromium"

Add node.js per the instructions.

            "curl -fsSL https://deb.nodesource.com/setup_current.x | bash -",
            "apt update",
            f"{apt_install} nodejs",

All one big command! Therefore, there are no commas after each line, but instead a trailing space.

        f"{apt_install} gcc unzip "

For jobe’s runguard.

        "sudo "

Some books use the Sphinx graphviz extension, which needs the graphviz` binary.

        "graphviz "

TODO: What is this for?

        "libfreetype6-dev "

Required for postgres.

        "postgresql-client-13 "

TODO: should this only be installed in the dev image?

        "libpq-dev libxml2-dev libxslt1-dev "
        "certbot python3-certbot-nginx "
        "rsync wget nginx "

For use with runguard – must call setfacl.

        "acl "

Useful tools for debug.

        "nano less ",

Build runguard and set up Jobe users. Needed by BookServer’s internal/scheduled_builder.py`.

    xqt("mkdir /var/www/jobe")
        "cp -r $RUNESTONE_PATH/docker/runguard .",
        f"{sys.executable} $RUNESTONE_PATH/docker/runguard-install.py",

    if arm:

Install the ARM tools (and the QEMU emulator).

            f"{apt_install} qemu-system-arm gcc-arm-none-eabi libnewlib-arm-none-eabi build-essential",

    if build_config.is_dev():

Tests use html5validator, which requires the JDK.

            f"{apt_install} openjdk-11-jre-headless git xvfb x11-utils {browser} lsof emacs-nox",
            f"wget --no-verbose https://chromedriver.storage.googleapis.com/{CHROMEDRIVER_VERSION}/chromedriver_linux64.zip",
            "unzip chromedriver_linux64.zip",
            "rm chromedriver_linux64.zip",
            "mv chromedriver /usr/bin/chromedriver",
            "chown root:root /usr/bin/chromedriver",
            "chmod +x /usr/bin/chromedriver",

Provide VNC access. TODO: just pass the correct DISPLAY value and ports and use X11 locally, but how? Here’s the best info I’ve found. Notes on my failures:

  • Including network_mode: host in docker-compose.yml - Configure containerized Docker application works. However, this breaks everything else (port mapping, links, etc.). It suggests that the correct networking setup would make this work.

  • Passing volume: - /tmp/.X11-unix:/tmp/.X11-unix has no effect (on a Ubuntu 20.03.4 LTS host). Per the previous point, it seems that X11 is using TCP as its transport.

  • Mapping X11 ports via ports: - "6000-6063:6000-6063" doesn’t work.

  • Setting DISPLAY to various values (from the host’s hostname -I, or various names to route to the host) doesn’t work.

Install a VNC server plus a simple window manager.

            f"{apt_install} x11vnc icewm",

    if pic24:

When changing the xc16 version, update the string below and the path added at the end of this block.


Install the xc16 compiler.

            f"eatmydata wget --no-verbose https://ww1.microchip.com/downloads/en/DeviceDoc/{XC16_VERSION}",
            f"chmod a+x {XC16_VERSION}",

The installer complains if the netserver name isn’t specified. This option isn’t documented in the --help. So, supply junk, and it seems to work.

            f"eatmydata ./{XC16_VERSION} --mode unattended --netservername foo",
            f"rm {XC16_VERSION}",

MPLAB X install

Needed to run sim30: per https://unix.stackexchange.com/questions/486806/steam-missing-32-bit-libraries-libx11-6, enable 32-bit libs.

            "eatmydata dpkg --add-architecture i386",
            "eatmydata apt update",
            "eatmydata apt install -y lib32stdc++6 libc6:i386",

Then download and install MPLAB X.

            f'eatmydata wget --no-verbose "https://ww1.microchip.com/downloads/en/DeviceDoc/{MPLABX_VERSION}"',
            f'eatmydata tar -xf "{MPLABX_VERSION}"',
            f'rm "{MPLABX_VERSION}"',

Install just the IDE and the 16-bit tools. This program checks to see if this is being run by root by looking at the USER env var, which Docker doesn’t set. Fake it out.

            f'USER=root eatmydata "./{MPLABX_SH_NAME}" -- --mode unattended --ipe 0 --8bitmcu 0 --32bitmcu 0 --othermcu 0',
            f'rm "{MPLABX_SH_NAME}"',

Add the path to the xc16 tools. Note that /root/.bashrc doesn’t get sourced when Docker starts up; therefore, the Dockerfile - create a container hosting the Runestone servers invokes bash when running the startup script.

        with open("/root/.bashrc", "a", encoding="utf-8") as f:
            f.write("\nexport PATH=$PATH:/opt/microchip/xc16/v1.70/bin\n")

Just symlink mdb, since that’s the only tool we use.

            "ln -sf /opt/microchip/mplabx/v5.50/mplab_platform/bin/mdb.sh /usr/local/bin/mdb"

Microchip tools (mdb) needs write access to these directories.

        mchp_packs = "/var/www/.mchp_packs"
        java = "/var/www/.java"
        for path in (mchp_packs, java):
            xqt(f"mkdir {path}", f"eatmydata chown www-data:www-data {path}")

    if tex:
        xqt(f"{apt_install} texlive-full xsltproc pdf2svg")

    if rust:
        xqt(f"{apt_install} cargo")

    if verilog:
        xqt(f"{apt_install} iverilog")

Install web2py and Poetry

        "mkdir -p $WEB2PY_PATH",

Make the www-data the owner and place its files in the www-data group. This is because web2py needs to write to this directory tree (log, errors, etc.).

        "eatmydata chown www-data:www-data $WEB2PY_PATH",

Make any newly created directories have the www-group. Give the group write permission.

        "eatmydata chmod g+ws $WEB2PY_PATH",
    w2p_parent = Path(env.WEB2PY_PATH).parent
        "eatmydata wget --no-verbose https://runestone.academy/cdn/runestone/web2py_src_2.21.zip",
        "eatmydata unzip -q web2py_src_2.21.zip",
        "rm -f web2py_src_2.21.zip",


Clean up after web2py install.

        "rm -rf $WEB2PY_PATH/.cache/*",
        "cp scripts/routes.py $WEB2PY_PATH/routes.py",

Install Poetry, putting it in a location already in $PATH.

        "eatmydata curl -sSL https://install.python-poetry.org | POETRY_HOME=/usr/local python3 -",