pc-backup/start.py

import os
import sys
import subprocess
import socket
from pathlib import Path, PurePosixPath
from dataclasses import dataclass
from typing import Any
from enum import StrEnum

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 KeePass:
    path: Path
    bin: str | Path

    def read_entry_attribute(self, key, attribute):
        return self._exec(["show", "-a", attribute, self.path, key]).strip()

    def _exec(self, args: list[Any]):
        return subprocess.check_output([self.bin] + args, text=True)

    @classmethod
    def new(cls, path: Path):
        binary = Path("C:\\") / "Program Files" / "KeePassXC" / "keepassxc-cli.exe" if is_windows else "keepassxc-cli"
        return cls(path=path, bin=binary)


class SecretType(StrEnum):
    File="file"
    KeepassAttribute="keepass-attribute"


@dataclass
class Secret:
    name: str
    mode: int
    type: SecretType
    host_path: Path | None = None
    key: str | None = None
    attribute: str | None  = None

    def create(self, keepass: KeePass):
        match self.type:
            case SecretType.File:
                args = ["podman", "secret", "create", "--replace", self.name, self.host_path]
                print(args)
                subprocess.run(args)

            case SecretType.KeepassAttribute:
                value = keepass.read_entry_attribute(self.key, self.attribute)
                args = ["podman", "secret", "create", "--replace", self.name, "-"]
                print(args)
                subprocess.run(args, input=value.encode())

    @classmethod
    def from_line(cls, line: str):
        type_, *args = line.split(",")
        match (SecretType(type_), *args):
            case (SecretType.File, path):
                path = Path(path).expanduser()
                return cls(host_path=path, name=path.name, mode=0o0400, type=SecretType.File)
            case (SecretType.KeepassAttribute, key, attribute):
                return cls(name=key, key=key, mode=0o0400, type=SecretType.KeepassAttribute, attribute=attribute)

    @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 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 ?")

    try:
        if sys.argv[1] == "create_secrets":
            keepass_path = Path(sys.argv[2])
            keepass = KeePass.new(keepass_path)
            for s in secret_sources:
                s.create(keepass)

        elif sys.argv[1] == "start":
            start_borgmatic_container(hostname, login, secret_sources)

        elif sys.argv[1] == "rm":
            subprocess.run(["podman", "rm", "-f", f"borgmatic_{login}"])

        elif sys.argv[1] == "bash":
            subprocess.run(["podman", "exec", "-ti", f"borgmatic_{login}", "bash"])

    except IndexError:
        print("You should provide an argument")
        exit(1)


if __name__ == "__main__":
    main()