Mini Shell

import os
from pathlib import Path
from typing import Union


def find_bin(cmd: str) -> Union[Path, None]:
    """Locate the specified program or return None"""
    path = Path(cmd)
    if path.is_absolute():
        if path.is_file():
            return path
        return None
    for exec_path in os.get_exec_path():
        path = Path(exec_path) / cmd
        if path.is_file():
            return path
    return None


def is_vps() -> bool:
    """Check if running on a Virtuozzo container"""
    try:
        with open("/proc/vz/veinfo", encoding='utf-8') as handle:
            ve_data = handle.read().strip()
    except IOError:
        return False  # if veinfo doesn't exist this can't be a vps
    if ve_data.count("\n") != 0:
        return False
    try:
        # if veinfo contains >1 line, this is a VZ node
        veid = int(ve_data.split()[0])
    except ValueError:
        return False
    return veid != 0