pc-backup/start.py

import os
import subprocess
import socket
from pathlib import Path, PurePosixPath
from dataclasses import dataclass

is_windows = os.name == "nt"


def read_data_sources(hostname: str, login: str) -> list[Path]:
    file = Path(f"./data_sources_{hostname}_{login}")
    with open(file) as f:
        paths = f.readlines()
        return [Path(p_str.strip()).expanduser() for p_str in paths]


@dataclass
class Secret:
    host_path: Path
    name: str
    mode: int

    def create(self):
        args = ["podman", "secret", "create", "--replace", self.name, self.host_path]
        print(args)
        subprocess.run(args)

    @classmethod
    def from_line(cls, line: str):
        path = Path(line).expanduser()
        return cls(host_path=path, name=path.name, mode=0o0400)

    @classmethod
    def read_sources(cls, hostname: str, login: str) -> list["Secret"]:
        file = Path(f"./secret_sources_{hostname}_{login}")
        with open(file) as f:
            lines = f.readlines()
            return [cls.from_line(l.strip()) for l in lines]


def to_source_path(path: Path):
    mount_base = PurePosixPath("/mnt") / "source"
    inner_path = PurePosixPath(path)
    with_drive = PurePosixPath(inner_path.parts[0].replace(":", "")).joinpath(*inner_path.parts[1:])
    return mount_base / with_drive.relative_to(with_drive.anchor)


def create_secrets(secret_sources: list[Secret]):
    for s in secret_sources:
        s.create()


def start_borgmatic_container(hostname: str, login: str, secret_sources: list[Secret]):
    data_sources = read_data_sources(hostname, login)
    container_name = f"borgmatic_{login}"
    ssh_auth_sock = os.getenv("SSH_AUTH_SOCK")

    data_path = Path.cwd() / "data"
    config_d_path = data_path / "borgmatic.d"
    config_path = data_path / "borgmatic"
    history_file = data_path / ".bash_history"
    history_file.touch()
    ssh_config_path = Path.home() / ".ssh"
    volumes = [
        f"{config_d_path}:/etc/borgmatic.d/",
        f"{config_path}:/etc/borgmatic/",
        f"{ssh_config_path}:/root/.ssh",
        f"{history_file}:/root/.bash_history",
        "borg_config:/root/.config/borg",
        "borg_cache:/root/.cache/borg",
        "borgmatic_state:/root/.local/state/borgmatic",
    ]
    if ssh_auth_sock:
        volumes += [f"{ssh_auth_sock}:{ssh_auth_sock}:Z"]

    volumes += [
        f"{vol}:{to_source_path(vol)}:ro" for vol in data_sources
    ]

    volume_args = [a for vol in volumes for a in ["-v", vol]]

    secrets_args = [a for s in secret_sources for a in ["--secret", f"{s.name},mode=0{s.mode:o}"]]
    image_name = "ghcr.io/borgmatic-collective/borgmatic"

    args = [
        "podman",
        "run",
        "-h",
        hostname,
        "--detach",
        "--name",
        container_name,
        "-e",
        "SSH_AUTH_SOCK",
        "-e",
        "TZ=Europe/Paris",
        "-e",
        "SSH_KEY_NAME",
        "-e",
        f"HOST_LOGIN={login}",
        "--security-opt=label=disable"
    ] + volume_args + secrets_args + [image_name]
    print(args)
    subprocess.run(args)


def main():
    login = os.getlogin()
    hostname = socket.gethostname()

    secret_sources = Secret.read_sources(hostname, login)

    if not secret_sources:
        print("no secret required ?")

    create_secrets(secret_sources)
    start_borgmatic_container(hostname, login, secret_sources)


if __name__ == "__main__":
    main()