relay/cmdeploy/src/cmdeploy/__init__.py

"""
Chat Mail pyinfra deploy.
"""

import importlib.resources
import io
import shutil
import subprocess
import sys
from io import StringIO
from pathlib import Path

from chatmaild.config import Config, read_config
from pyinfra import facts, host
from pyinfra.api import FactBase
from pyinfra.facts.files import File
from pyinfra.facts.server import Sysctl
from pyinfra.facts.systemd import SystemdEnabled, SystemdStatus
from pyinfra.operations import apt, files, pip, server, systemd

from .acmetool import deploy_acmetool


class Port(FactBase):
    """
    Returns the process occuping a port.
    """

    def command(self, port: int) -> str:
        return (
            "ss -lptn 'src :%d' | awk 'NR>1 {print $6,$7}' | sed 's/users:((\"//;s/\".*//'"
            % (port,)
        )

    def process(self, output: [str]) -> str:
        return output[0]


def _build_chatmaild(dist_dir) -> None:
    dist_dir = Path(dist_dir).resolve()
    if dist_dir.exists():
        shutil.rmtree(dist_dir)
    dist_dir.mkdir()
    subprocess.check_output(
        [sys.executable, "-m", "build", "-n"]
        + ["--sdist", "chatmaild", "--outdir", str(dist_dir)]
    )
    entries = list(dist_dir.iterdir())
    assert len(entries) == 1
    return entries[0]


def remove_legacy_artifacts():
    # disable legacy doveauth-dictproxy.service
    if host.get_fact(SystemdEnabled).get("doveauth-dictproxy.service"):
        systemd.service(
            name="Disable legacy doveauth-dictproxy.service",
            service="doveauth-dictproxy.service",
            running=False,
            enabled=False,
        )


def _install_remote_venv_with_chatmaild(config) -> None:
    remove_legacy_artifacts()
    dist_file = _build_chatmaild(dist_dir=Path("chatmaild/dist"))
    remote_base_dir = "/usr/local/lib/chatmaild"
    remote_dist_file = f"{remote_base_dir}/dist/{dist_file.name}"
    remote_venv_dir = f"{remote_base_dir}/venv"
    remote_chatmail_inipath = f"{remote_base_dir}/chatmail.ini"
    root_owned = dict(user="root", group="root", mode="644")

    apt.packages(
        name="apt install python3-virtualenv",
        packages=["python3-virtualenv"],
    )

    files.put(
        name="Upload chatmaild source package",
        src=dist_file.open("rb"),
        dest=remote_dist_file,
        create_remote_dir=True,
        **root_owned,
    )

    files.put(
        name=f"Upload {remote_chatmail_inipath}",
        src=config._getbytefile(),
        dest=remote_chatmail_inipath,
        **root_owned,
    )

    pip.virtualenv(
        name=f"chatmaild virtualenv {remote_venv_dir}",
        path=remote_venv_dir,
        always_copy=True,
    )

    apt.packages(
        name="install gcc and headers to build crypt_r source package",
        packages=["gcc", "python3-dev"],
    )

    server.shell(
        name=f"forced pip-install {dist_file.name}",
        commands=[
            f"{remote_venv_dir}/bin/pip install --force-reinstall {remote_dist_file}"
        ],
    )

    files.template(
        src=importlib.resources.files(__package__).joinpath("metrics.cron.j2"),
        dest="/etc/cron.d/chatmail-metrics",
        user="root",
        group="root",
        mode="644",
        config={
            "mailboxes_dir": config.mailboxes_dir,
            "execpath": f"{remote_venv_dir}/bin/chatmail-metrics",
        },
    )

    # install systemd units
    for fn in (
        "doveauth",
        "filtermail",
        "filtermail-incoming",
        "echobot",
        "chatmail-metadata",
        "lastlogin",
    ):
        execpath = fn if fn != "filtermail-incoming" else "filtermail"
        params = dict(
            execpath=f"{remote_venv_dir}/bin/{execpath}",
            config_path=remote_chatmail_inipath,
            remote_venv_dir=remote_venv_dir,
            mail_domain=config.mail_domain,
        )
        source_path = importlib.resources.files(__package__).joinpath(
            "service", f"{fn}.service.f"
        )
        content = source_path.read_text().format(**params).encode()

        files.put(
            name=f"Upload {fn}.service",
            src=io.BytesIO(content),
            dest=f"/etc/systemd/system/{fn}.service",
            **root_owned,
        )
        systemd.service(
            name=f"Setup {fn} service",
            service=f"{fn}.service",
            running=True,
            enabled=True,
            restarted=True,
            daemon_reload=True,
        )


def _configure_opendkim(domain: str, dkim_selector: str = "dkim") -> bool:
    """Configures OpenDKIM"""
    need_restart = False

    main_config = files.template(
        src=importlib.resources.files(__package__).joinpath("opendkim/opendkim.conf"),
        dest="/etc/opendkim.conf",
        user="root",
        group="root",
        mode="644",
        config={"domain_name": domain, "opendkim_selector": dkim_selector},
    )
    need_restart |= main_config.changed

    screen_script = files.put(
        src=importlib.resources.files(__package__).joinpath("opendkim/screen.lua"),
        dest="/etc/opendkim/screen.lua",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= screen_script.changed

    final_script = files.put(
        src=importlib.resources.files(__package__).joinpath("opendkim/final.lua"),
        dest="/etc/opendkim/final.lua",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= final_script.changed

    files.directory(
        name="Add opendkim directory to /etc",
        path="/etc/opendkim",
        user="opendkim",
        group="opendkim",
        mode="750",
        present=True,
    )

    keytable = files.template(
        src=importlib.resources.files(__package__).joinpath("opendkim/KeyTable"),
        dest="/etc/dkimkeys/KeyTable",
        user="opendkim",
        group="opendkim",
        mode="644",
        config={"domain_name": domain, "opendkim_selector": dkim_selector},
    )
    need_restart |= keytable.changed

    signing_table = files.template(
        src=importlib.resources.files(__package__).joinpath("opendkim/SigningTable"),
        dest="/etc/dkimkeys/SigningTable",
        user="opendkim",
        group="opendkim",
        mode="644",
        config={"domain_name": domain, "opendkim_selector": dkim_selector},
    )
    need_restart |= signing_table.changed
    files.directory(
        name="Add opendkim socket directory to /var/spool/postfix",
        path="/var/spool/postfix/opendkim",
        user="opendkim",
        group="opendkim",
        mode="750",
        present=True,
    )

    apt.packages(
        name="apt install opendkim opendkim-tools",
        packages=["opendkim", "opendkim-tools"],
    )

    if not host.get_fact(File, f"/etc/dkimkeys/{dkim_selector}.private"):
        server.shell(
            name="Generate OpenDKIM domain keys",
            commands=[
                f"/usr/sbin/opendkim-genkey -D /etc/dkimkeys -d {domain} -s {dkim_selector}"
            ],
            _use_su_login=True,
            _su_user="opendkim",
        )

    service_file = files.put(
        name="Configure opendkim to restart once a day",
        src=importlib.resources.files(__package__).joinpath("opendkim/systemd.conf"),
        dest="/etc/systemd/system/opendkim.service.d/10-prevent-memory-leak.conf",
    )
    need_restart |= service_file.changed

    return need_restart


def _uninstall_mta_sts_daemon() -> None:
    # Remove configuration.
    files.file("/etc/mta-sts-daemon.yml", present=False)

    files.directory("/usr/local/lib/postfix-mta-sts-resolver", present=False)

    files.file("/etc/systemd/system/mta-sts-daemon.service", present=False)

    systemd.service(
        name="Stop MTA-STS daemon",
        service="mta-sts-daemon.service",
        daemon_reload=True,
        running=False,
        enabled=False,
    )


def _configure_postfix(config: Config, debug: bool = False) -> bool:
    """Configures Postfix SMTP server."""
    need_restart = False

    main_config = files.template(
        src=importlib.resources.files(__package__).joinpath("postfix/main.cf.j2"),
        dest="/etc/postfix/main.cf",
        user="root",
        group="root",
        mode="644",
        config=config,
        disable_ipv6=config.disable_ipv6,
    )
    need_restart |= main_config.changed

    master_config = files.template(
        src=importlib.resources.files(__package__).joinpath("postfix/master.cf.j2"),
        dest="/etc/postfix/master.cf",
        user="root",
        group="root",
        mode="644",
        debug=debug,
        config=config,
    )
    need_restart |= master_config.changed

    header_cleanup = files.put(
        src=importlib.resources.files(__package__).joinpath(
            "postfix/submission_header_cleanup"
        ),
        dest="/etc/postfix/submission_header_cleanup",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= header_cleanup.changed

    # Login map that 1:1 maps email address to login.
    login_map = files.put(
        src=importlib.resources.files(__package__).joinpath("postfix/login_map"),
        dest="/etc/postfix/login_map",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= login_map.changed

    return need_restart


def _install_dovecot_package(package: str, arch: str):
    arch = "amd64" if arch == "x86_64" else arch
    arch = "arm64" if arch == "aarch64" else arch
    url = f"https://download.delta.chat/dovecot/dovecot-{package}_2.3.21%2Bdfsg1-3_{arch}.deb"
    deb_filename = "/root/" + url.split("/")[-1]

    match (package, arch):
        case ("core", "amd64"):
            sha256 = "43f593332e22ac7701c62d58b575d2ca409e0f64857a2803be886c22860f5587"
        case ("core", "arm64"):
            sha256 = "4d21eba1a83f51c100f08f2e49f0c9f8f52f721ebc34f75018e043306da993a7"
        case ("imapd", "amd64"):
            sha256 = "8d8dc6fc00bbb6cdb25d345844f41ce2f1c53f764b79a838eb2a03103eebfa86"
        case ("imapd", "arm64"):
            sha256 = "178fa877ddd5df9930e8308b518f4b07df10e759050725f8217a0c1fb3fd707f"
        case ("lmtpd", "amd64"):
            sha256 = "2f69ba5e35363de50962d42cccbfe4ed8495265044e244007d7ccddad77513ab"
        case ("lmtpd", "arm64"):
            sha256 = "89f52fb36524f5877a177dff4a713ba771fd3f91f22ed0af7238d495e143b38f"
        case _:
            apt.packages(packages=[f"dovecot-{package}"])
            return

    files.download(
        name=f"Download dovecot-{package}",
        src=url,
        dest=deb_filename,
        sha256sum=sha256,
        cache_time=60 * 60 * 24 * 365 * 10,  # never redownload the package
    )

    apt.deb(name=f"Install dovecot-{package}", src=deb_filename)


def _configure_dovecot(config: Config, debug: bool = False) -> bool:
    """Configures Dovecot IMAP server."""
    need_restart = False

    main_config = files.template(
        src=importlib.resources.files(__package__).joinpath("dovecot/dovecot.conf.j2"),
        dest="/etc/dovecot/dovecot.conf",
        user="root",
        group="root",
        mode="644",
        config=config,
        debug=debug,
        disable_ipv6=config.disable_ipv6,
    )
    need_restart |= main_config.changed
    auth_config = files.put(
        src=importlib.resources.files(__package__).joinpath("dovecot/auth.conf"),
        dest="/etc/dovecot/auth.conf",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= auth_config.changed
    lua_push_notification_script = files.put(
        src=importlib.resources.files(__package__).joinpath(
            "dovecot/push_notification.lua"
        ),
        dest="/etc/dovecot/push_notification.lua",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= lua_push_notification_script.changed

    files.template(
        src=importlib.resources.files(__package__).joinpath("dovecot/expunge.cron.j2"),
        dest="/etc/cron.d/expunge",
        user="root",
        group="root",
        mode="644",
        config=config,
    )

    # as per https://doc.dovecot.org/2.3/configuration_manual/os/
    # it is recommended to set the following inotify limits
    if config.change_kernel_settings:
        for name in ("max_user_instances", "max_user_watches"):
            key = f"fs.inotify.{name}"
            if host.get_fact(Sysctl)[key] == config.fs_inotify_max_user_instances_and_watchers:
                # Skip updating limits if already sufficient
                # (enables running in incus containers where sysctl readonly)
                continue
            server.sysctl(
                name=f"Change {key}",
                key=key,
                value=config.fs_inotify_max_user_instances_and_watchers,
                persist=True,
            )

    timezone_env = files.line(
        name="Set TZ environment variable",
        path="/etc/environment",
        line="TZ=:/etc/localtime",
    )
    need_restart |= timezone_env.changed

    return need_restart


def _configure_nginx(config: Config, debug: bool = False) -> bool:
    """Configures nginx HTTP server."""
    need_restart = False

    main_config = files.template(
        src=importlib.resources.files(__package__).joinpath("nginx/nginx.conf.j2"),
        dest="/etc/nginx/nginx.conf",
        user="root",
        group="root",
        mode="644",
        config={"domain_name": config.mail_domain},
        disable_ipv6=config.disable_ipv6,
    )
    need_restart |= main_config.changed

    autoconfig = files.template(
        src=importlib.resources.files(__package__).joinpath("nginx/autoconfig.xml.j2"),
        dest="/var/www/html/.well-known/autoconfig/mail/config-v1.1.xml",
        user="root",
        group="root",
        mode="644",
        config={"domain_name": config.mail_domain},
    )
    need_restart |= autoconfig.changed

    mta_sts_config = files.template(
        src=importlib.resources.files(__package__).joinpath("nginx/mta-sts.txt.j2"),
        dest="/var/www/html/.well-known/mta-sts.txt",
        user="root",
        group="root",
        mode="644",
        config={"domain_name": config.mail_domain},
    )
    need_restart |= mta_sts_config.changed

    # install CGI newemail script
    #
    cgi_dir = "/usr/lib/cgi-bin"
    files.directory(
        name=f"Ensure {cgi_dir} exists",
        path=cgi_dir,
        user="root",
        group="root",
    )

    files.put(
        name="Upload cgi newemail.py script",
        src=importlib.resources.files("chatmaild").joinpath("newemail.py").open("rb"),
        dest=f"{cgi_dir}/newemail.py",
        user="root",
        group="root",
        mode="755",
    )

    return need_restart


def _remove_rspamd() -> None:
    """Remove rspamd"""
    apt.packages(name="Remove rspamd", packages="rspamd", present=False)


def check_config(config):
    mail_domain = config.mail_domain
    if mail_domain != "testrun.org" and not mail_domain.endswith(".testrun.org"):
        blocked_words = "merlinux schmieder testrun.org".split()
        for key in config.__dict__:
            value = config.__dict__[key]
            if key.startswith("privacy") and any(
                x in str(value) for x in blocked_words
            ):
                raise ValueError(
                    f"please set your own privacy contacts/addresses in {config._inipath}"
                )
    return config


def deploy_mtail(config):
    # Uninstall mtail package, we are going to install a static binary.
    apt.packages(name="Uninstall mtail", packages=["mtail"], present=False)

    (url, sha256sum) = {
        "x86_64": (
            "https://github.com/google/mtail/releases/download/v3.0.8/mtail_3.0.8_linux_amd64.tar.gz",
            "123c2ee5f48c3eff12ebccee38befd2233d715da736000ccde49e3d5607724e4",
        ),
        "aarch64": (
            "https://github.com/google/mtail/releases/download/v3.0.8/mtail_3.0.8_linux_arm64.tar.gz",
            "aa04811c0929b6754408676de520e050c45dddeb3401881888a092c9aea89cae",
        ),
    }[host.get_fact(facts.server.Arch)]

    server.shell(
        name="Download mtail",
        commands=[
            f"(echo '{sha256sum} /usr/local/bin/mtail' | sha256sum -c) || (curl -L {url} | gunzip | tar -x -f - mtail -O >/usr/local/bin/mtail.new && mv /usr/local/bin/mtail.new /usr/local/bin/mtail)",
            "chmod 755 /usr/local/bin/mtail",
        ],
    )

    # Using our own systemd unit instead of `/usr/lib/systemd/system/mtail.service`.
    # This allows to read from journalctl instead of log files.
    files.template(
        src=importlib.resources.files(__package__).joinpath("mtail/mtail.service.j2"),
        dest="/etc/systemd/system/mtail.service",
        user="root",
        group="root",
        mode="644",
        address=config.mtail_address or "127.0.0.1",
        port=3903,
    )

    mtail_conf = files.put(
        name="Mtail configuration",
        src=importlib.resources.files(__package__).joinpath(
            "mtail/delivered_mail.mtail"
        ),
        dest="/etc/mtail/delivered_mail.mtail",
        user="root",
        group="root",
        mode="644",
    )

    systemd.service(
        name="Start and enable mtail",
        service="mtail.service",
        running=bool(config.mtail_address),
        enabled=bool(config.mtail_address),
        restarted=mtail_conf.changed,
    )


def deploy_iroh_relay(config) -> None:
    (url, sha256sum) = {
        "x86_64": (
            "https://github.com/n0-computer/iroh/releases/download/v0.28.1/iroh-relay-v0.28.1-x86_64-unknown-linux-musl.tar.gz",
            "2ffacf7c0622c26b67a5895ee8e07388769599f60e5f52a3bd40a3258db89b2c",
        ),
        "aarch64": (
            "https://github.com/n0-computer/iroh/releases/download/v0.28.1/iroh-relay-v0.28.1-aarch64-unknown-linux-musl.tar.gz",
            "b915037bcc1ff1110cc9fcb5de4a17c00ff576fd2f568cd339b3b2d54c420dc4",
        ),
    }[host.get_fact(facts.server.Arch)]

    apt.packages(
        name="Install curl",
        packages=["curl"],
    )

    server.shell(
        name="Download iroh-relay",
        commands=[
            f"(echo '{sha256sum} /usr/local/bin/iroh-relay' | sha256sum -c) || (curl -L {url} | gunzip | tar -x -f - ./iroh-relay -O >/usr/local/bin/iroh-relay.new && mv /usr/local/bin/iroh-relay.new /usr/local/bin/iroh-relay)",
            "chmod 755 /usr/local/bin/iroh-relay",
        ],
    )

    need_restart = False

    systemd_unit = files.put(
        name="Upload iroh-relay systemd unit",
        src=importlib.resources.files(__package__).joinpath("iroh-relay.service"),
        dest="/etc/systemd/system/iroh-relay.service",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= systemd_unit.changed

    iroh_config = files.put(
        name="Upload iroh-relay config",
        src=importlib.resources.files(__package__).joinpath("iroh-relay.toml"),
        dest="/etc/iroh-relay.toml",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= iroh_config.changed

    systemd.service(
        name="Start and enable iroh-relay",
        service="iroh-relay.service",
        running=True,
        enabled=config.enable_iroh_relay,
        restarted=need_restart,
    )


def deploy_chatmail(config_path: Path, disable_mail: bool) -> None:
    """Deploy a chat-mail instance.

    :param config_path: path to chatmail.ini
    :param disable_mail: whether to disable postfix & dovecot
    """
    config = read_config(config_path)
    check_config(config)
    mail_domain = config.mail_domain

    from .www import build_webpages

    server.group(name="Create vmail group", group="vmail", system=True)
    server.user(name="Create vmail user", user="vmail", group="vmail", system=True)
    server.group(name="Create opendkim group", group="opendkim", system=True)
    server.user(
        name="Create opendkim user",
        user="opendkim",
        groups=["opendkim"],
        system=True,
    )
    server.user(
        name="Add postfix user to opendkim group for socket access",
        user="postfix",
        groups=["opendkim"],
        system=True,
    )
    server.user(name="Create echobot user", user="echobot", system=True)
    server.user(name="Create iroh user", user="iroh", system=True)

    # Add our OBS repository for dovecot_no_delay
    files.put(
        name="Add Deltachat OBS GPG key to apt keyring",
        src=importlib.resources.files(__package__).joinpath("obs-home-deltachat.gpg"),
        dest="/etc/apt/keyrings/obs-home-deltachat.gpg",
        user="root",
        group="root",
        mode="644",
    )

    files.line(
        name="Add DeltaChat OBS home repository to sources.list",
        path="/etc/apt/sources.list",
        line="deb [signed-by=/etc/apt/keyrings/obs-home-deltachat.gpg] https://download.opensuse.org/repositories/home:/deltachat/Debian_12/ ./",
        escape_regex_characters=True,
        present=False,
    )

    if host.get_fact(Port, port=53) != "unbound":
        files.line(
            name="Add 9.9.9.9 to resolv.conf",
            path="/etc/resolv.conf",
            line="nameserver 9.9.9.9",
        )
    apt.update(name="apt update", cache_time=24 * 3600)
    apt.upgrade(name="upgrade apt packages", auto_remove=True)

    apt.packages(
        name="Install rsync",
        packages=["rsync"],
    )

    # Run local DNS resolver `unbound`.
    # `resolvconf` takes care of setting up /etc/resolv.conf
    # to use 127.0.0.1 as the resolver.
    from cmdeploy.cmdeploy import Out

    process_on_53 = host.get_fact(Port, port=53)
    if host.get_fact(SystemdStatus, services="unbound").get("unbound.service"):
        process_on_53 = "unbound"
    if process_on_53 not in (None, "unbound"):
        Out().red(f"Can't install unbound: port 53 is occupied by: {process_on_53}")
        exit(1)
    apt.packages(
        name="Install unbound",
        packages=["unbound", "unbound-anchor", "dnsutils"],
    )
    server.shell(
        name="Generate root keys for validating DNSSEC",
        commands=[
            "unbound-anchor -a /var/lib/unbound/root.key || true",
            "systemctl reset-failed unbound.service",
        ],
    )
    systemd.service(
        name="Start and enable unbound",
        service="unbound.service",
        running=True,
        enabled=True,
    )

    deploy_iroh_relay(config)

    # Deploy acmetool to have TLS certificates.
    if not config.use_foreign_cert_manager:
        tls_domains = [mail_domain, f"mta-sts.{mail_domain}", f"www.{mail_domain}"]
        deploy_acmetool(
            email = config.acme_email,
            domains=tls_domains,
        )

    apt.packages(
        # required for setfacl for echobot
        name="Install acl",
        packages="acl",
    )

    apt.packages(
        name="Install Postfix",
        packages="postfix",
    )

    if not "dovecot.service" in host.get_fact(SystemdEnabled):
        _install_dovecot_package("core", host.get_fact(facts.server.Arch))
        _install_dovecot_package("imapd", host.get_fact(facts.server.Arch))
        _install_dovecot_package("lmtpd", host.get_fact(facts.server.Arch))

    apt.packages(
        name="Install nginx",
        packages=["nginx", "libnginx-mod-stream"],
    )

    apt.packages(
        name="Install fcgiwrap",
        packages=["fcgiwrap"],
    )

    www_path = importlib.resources.files(__package__).joinpath("../../../www").resolve()

    build_dir = www_path.joinpath("build")
    src_dir = www_path.joinpath("src")
    build_webpages(src_dir, build_dir, config)
    files.rsync(f"{build_dir}/", "/var/www/html", flags=["-avz"])

    _install_remote_venv_with_chatmaild(config)
    debug = False
    dovecot_need_restart = _configure_dovecot(config, debug=debug)
    postfix_need_restart = _configure_postfix(config, debug=debug)
    nginx_need_restart = _configure_nginx(config)
    _uninstall_mta_sts_daemon()

    _remove_rspamd()
    opendkim_need_restart = _configure_opendkim(mail_domain, "opendkim")

    systemd.service(
        name="Start and enable OpenDKIM",
        service="opendkim.service",
        running=True,
        enabled=True,
        daemon_reload=opendkim_need_restart,
        restarted=opendkim_need_restart,
    )

    # Dovecot should be started before Postfix
    # because it creates authentication socket
    # required by Postfix.
    systemd.service(
        name="disable dovecot for now" if disable_mail else "Start and enable Dovecot",
        service="dovecot.service",
        running=False if disable_mail else True,
        enabled=False if disable_mail else True,
        restarted=dovecot_need_restart if not disable_mail else False,
    )

    systemd.service(
        name="disable postfix for now" if disable_mail else "Start and enable Postfix",
        service="postfix.service",
        running=False if disable_mail else True,
        enabled=False if disable_mail else True,
        restarted=postfix_need_restart if not disable_mail else False,
    )

    systemd.service(
        name="Start and enable nginx",
        service="nginx.service",
        running=True,
        enabled=True,
        restarted=nginx_need_restart,
    )
    
    systemd.service(
        name="Start and enable fcgiwrap",
        service="fcgiwrap.service",
        running=True,
        enabled=True,
    )

    # This file is used by auth proxy.
    # https://wiki.debian.org/EtcMailName
    server.shell(
        name="Setup /etc/mailname",
        commands=[f"echo {mail_domain} >/etc/mailname; chmod 644 /etc/mailname"],
    )

    journald_conf = files.put(
        name="Configure journald",
        src=importlib.resources.files(__package__).joinpath("journald.conf"),
        dest="/etc/systemd/journald.conf",
        user="root",
        group="root",
        mode="644",
    )
    systemd.service(
        name="Start and enable journald",
        service="systemd-journald.service",
        running=True,
        enabled=True,
        restarted=journald_conf.changed,
    )
    files.directory(
        name="Ensure old logs on disk are deleted",
        path="/var/log/journal/",
        present=False,
    )

    apt.packages(
        name="Ensure cron is installed",
        packages=["cron"],
    )
    try:
        git_hash = subprocess.check_output(["git", "rev-parse", "HEAD"]).decode()
    except Exception:
        git_hash = "unknown\n"
    try:
        git_diff = subprocess.check_output(["git", "diff"]).decode()
    except Exception:
        git_diff = ""
    files.put(
        name="Upload chatmail relay git commiit hash",
        src=StringIO(git_hash + git_diff),
        dest="/etc/chatmail-version",
        mode="700",
    )

    deploy_mtail(config)