from __future__ import annotations import hashlib import json import logging import os import secrets import shlex import subprocess import string import sys import time import re from datetime import datetime, date from typing import Callable, Optional, Dict, Any, List, Union, Iterator, TYPE_CHECKING # https://stackoverflow.com/a/39757388/929999 if TYPE_CHECKING: from .installer import Installer if sys.platform == 'linux': from select import epoll, EPOLLIN, EPOLLHUP else: import select EPOLLIN = 0 EPOLLHUP = 0 class epoll(): """ #!if windows Create a epoll() implementation that simulates the epoll() behavior. This so that the rest of the code doesn't need to worry weither we're using select() or epoll(). """ def __init__(self) -> None: self.sockets: Dict[str, Any] = {} self.monitoring: Dict[int, Any] = {} def unregister(self, fileno :int, *args :List[Any], **kwargs :Dict[str, Any]) -> None: try: del(self.monitoring[fileno]) except: pass def register(self, fileno :int, *args :int, **kwargs :Dict[str, Any]) -> None: self.monitoring[fileno] = True def poll(self, timeout: float = 0.05, *args :str, **kwargs :Dict[str, Any]) -> List[Any]: try: return [[fileno, 1] for fileno in select.select(list(self.monitoring.keys()), [], [], timeout)[0]] except OSError: return [] from .exceptions import RequirementError, SysCallError from .output import log from .storage import storage def gen_uid(entropy_length :int = 256) -> str: return hashlib.sha512(os.urandom(entropy_length)).hexdigest() def generate_password(length :int = 64) -> str: haystack = string.printable # digits, ascii_letters, punctiation (!"#$[] etc) and whitespace return ''.join(secrets.choice(haystack) for i in range(length)) def multisplit(s :str, splitters :List[str]) -> str: s = [s, ] for key in splitters: ns = [] for obj in s: x = obj.split(key) for index, part in enumerate(x): if len(part): ns.append(part) if index < len(x) - 1: ns.append(key) s = ns return s def locate_binary(name :str) -> str: for PATH in os.environ['PATH'].split(':'): for root, folders, files in os.walk(PATH): for file in files: if file == name: return os.path.join(root, file) break # Don't recurse raise RequirementError(f"Binary {name} does not exist.") def clear_vt100_escape_codes(data :Union[bytes, str]): # https://stackoverflow.com/a/43627833/929999 if type(data) == bytes: vt100_escape_regex = bytes(r'\x1B\[[?0-9;]*[a-zA-Z]', 'UTF-8') else: vt100_escape_regex = r'\x1B\[[?0-9;]*[a-zA-Z]' for match in re.findall(vt100_escape_regex, data, re.IGNORECASE): data = data.replace(match, '' if type(data) == str else b'') return data def json_dumps(*args :str, **kwargs :str) -> str: return json.dumps(*args, **{**kwargs, 'cls': JSON}) class JsonEncoder: @staticmethod def _encode(obj :Any) -> Any: """ This JSON encoder function will try it's best to convert any archinstall data structures, instances or variables into something that's understandable by the json.parse()/json.loads() lib. _encode() will skip any dictionary key starting with an exclamation mark (!) """ if isinstance(obj, dict): # We'll need to iterate not just the value that default() usually gets passed # But also iterate manually over each key: value pair in order to trap the keys. copy = {} for key, val in list(obj.items()): if isinstance(val, dict): # This, is a EXTREMELY ugly hack.. but it's the only quick way I can think of to trigger a encoding of sub-dictionaries. val = json.loads(json.dumps(val, cls=JSON)) else: val = JsonEncoder._encode(val) if type(key) == str and key[0] == '!': pass else: copy[JsonEncoder._encode(key)] = val return copy elif hasattr(obj, 'json'): return obj.json() elif hasattr(obj, '__dump__'): return obj.__dump__() elif isinstance(obj, (datetime, date)): return obj.isoformat() elif isinstance(obj, (list, set, tuple)): return [json.loads(json.dumps(item, cls=JSON)) for item in obj] else: return obj @staticmethod def _unsafe_encode(obj :Any) -> Any: """ Same as _encode() but it keeps dictionary keys starting with ! """ if isinstance(obj, dict): copy = {} for key, val in list(obj.items()): if isinstance(val, dict): # This, is a EXTREMELY ugly hack.. but it's the only quick way I can think of to trigger a encoding of sub-dictionaries. val = json.loads(json.dumps(val, cls=UNSAFE_JSON)) else: val = JsonEncoder._unsafe_encode(val) copy[JsonEncoder._unsafe_encode(key)] = val return copy else: return JsonEncoder._encode(obj) class JSON(json.JSONEncoder, json.JSONDecoder): """ A safe JSON encoder that will omit private information in dicts (starting with !) """ def _encode(self, obj :Any) -> Any: return JsonEncoder._encode(obj) def encode(self, obj :Any) -> Any: return super(JSON, self).encode(self._encode(obj)) class UNSAFE_JSON(json.JSONEncoder, json.JSONDecoder): """ UNSAFE_JSON will call/encode and keep private information in dicts (starting with !) """ def _encode(self, obj :Any) -> Any: return JsonEncoder._unsafe_encode(obj) def encode(self, obj :Any) -> Any: return super(UNSAFE_JSON, self).encode(self._encode(obj)) class SysCommandWorker: def __init__(self, cmd :Union[str, List[str]], callbacks :Optional[Dict[str, Any]] = None, peak_output :Optional[bool] = False, environment_vars :Optional[Dict[str, Any]] = None, logfile :Optional[None] = None, working_directory :Optional[str] = './', remove_vt100_escape_codes_from_lines :bool = True): if not callbacks: callbacks = {} if not environment_vars: environment_vars = {} if type(cmd) is str: cmd = shlex.split(cmd) cmd = list(cmd) # This is to please mypy if cmd[0][0] != '/' and cmd[0][:2] != './': # "which" doesn't work as it's a builtin to bash. # It used to work, but for whatever reason it doesn't anymore. # We there for fall back on manual lookup in os.PATH cmd[0] = locate_binary(cmd[0]) self.cmd = cmd self.callbacks = callbacks self.peak_output = peak_output # define the standard locale for command outputs. For now the C ascii one. Can be overriden self.environment_vars = {**storage.get('CMD_LOCALE',{}),**environment_vars} self.logfile = logfile self.working_directory = working_directory self.exit_code :Optional[int] = None self._trace_log = b'' self._trace_log_pos = 0 self.poll_object = epoll() self.child_fd :Optional[int] = None self.started :Optional[float] = None self.ended :Optional[float] = None self.remove_vt100_escape_codes_from_lines :bool = remove_vt100_escape_codes_from_lines def __contains__(self, key: bytes) -> bool: """ Contains will also move the current buffert position forward. This is to avoid re-checking the same data when looking for output. """ assert type(key) == bytes if (contains := key in self._trace_log[self._trace_log_pos:]): self._trace_log_pos += self._trace_log[self._trace_log_pos:].find(key) + len(key) return contains def __iter__(self, *args :str, **kwargs :Dict[str, Any]) -> Iterator[bytes]: for line in self._trace_log[self._trace_log_pos:self._trace_log.rfind(b'\n')].split(b'\n'): if line: if self.remove_vt100_escape_codes_from_lines: line = clear_vt100_escape_codes(line) yield line + b'\n' self._trace_log_pos = self._trace_log.rfind(b'\n') def __repr__(self) -> str: self.make_sure_we_are_executing() return str(self._trace_log) def __enter__(self) -> 'SysCommandWorker': return self def __exit__(self, *args :str) -> None: # b''.join(sys_command('sync')) # No need to, since the underlying fs() object will call sync. # TODO: https://stackoverflow.com/questions/28157929/how-to-safely-handle-an-exception-inside-a-context-manager if self.child_fd: try: os.close(self.child_fd) except: pass if self.peak_output: # To make sure any peaked output didn't leave us hanging # on the same line we were on. sys.stdout.write("\n") sys.stdout.flush() if len(args) >= 2 and args[1]: log(args[1], level=logging.DEBUG, fg='red') if self.exit_code != 0: raise SysCallError(f"{self.cmd} exited with abnormal exit code [{self.exit_code}]: {self._trace_log[:500]}", self.exit_code) def is_alive(self) -> bool: self.poll() if self.started and self.ended is None: return True return False def write(self, data: bytes, line_ending :bool = True) -> int: assert type(data) == bytes # TODO: Maybe we can support str as well and encode it self.make_sure_we_are_executing() if self.child_fd: return os.write(self.child_fd, data + (b'\n' if line_ending else b'')) return 0 def make_sure_we_are_executing(self) -> bool: if not self.started: return self.execute() return True def tell(self) -> int: self.make_sure_we_are_executing() return self._trace_log_pos def seek(self, pos :int) -> None: self.make_sure_we_are_executing() # Safety check to ensure 0 < pos < len(tracelog) self._trace_log_pos = min(max(0, pos), len(self._trace_log)) def peak(self, output: Union[str, bytes]) -> bool: if self.peak_output: if type(output) == bytes: try: output = output.decode('UTF-8') except UnicodeDecodeError: return False with open(f"{storage['LOG_PATH']}/cmd_output.txt", "a") as peak_output_log: peak_output_log.write(output) sys.stdout.write(str(output)) sys.stdout.flush() return True def poll(self) -> None: self.make_sure_we_are_executing() if self.child_fd: got_output = False for fileno, event in self.poll_object.poll(0.1): try: output = os.read(self.child_fd, 8192) got_output = True self.peak(output) self._trace_log += output except OSError: self.ended = time.time() break if self.ended or (got_output is False and pid_exists(self.pid) is False): self.ended = time.time() try: self.exit_code = os.waitpid(self.pid, 0)[1] except ChildProcessError: try: self.exit_code = os.waitpid(self.child_fd, 0)[1] except ChildProcessError: self.exit_code = 1 def execute(self) -> bool: import pty if (old_dir := os.getcwd()) != self.working_directory: os.chdir(str(self.working_directory)) # Note: If for any reason, we get a Python exception between here # and until os.close(), the traceback will get locked inside # stdout of the child_fd object. `os.read(self.child_fd, 8192)` is the # only way to get the traceback without loosing it. self.pid, self.child_fd = pty.fork() os.chdir(old_dir) # https://stackoverflow.com/questions/4022600/python-pty-fork-how-does-it-work if not self.pid: try: try: with open(f"{storage['LOG_PATH']}/cmd_history.txt", "a") as cmd_log: cmd_log.write(f"{' '.join(self.cmd)}\n") except PermissionError: pass os.execve(self.cmd[0], list(self.cmd), {**os.environ, **self.environment_vars}) if storage['arguments'].get('debug'): log(f"Executing: {self.cmd}", level=logging.DEBUG) except FileNotFoundError: log(f"{self.cmd[0]} does not exist.", level=logging.ERROR, fg="red") self.exit_code = 1 return False self.started = time.time() self.poll_object.register(self.child_fd, EPOLLIN | EPOLLHUP) return True def decode(self, encoding :str = 'UTF-8') -> str: return self._trace_log.decode(encoding) class SysCommand: def __init__(self, cmd :Union[str, List[str]], callbacks :Optional[Dict[str, Callable[[Any], Any]]] = None, start_callback :Optional[Callable[[Any], Any]] = None, peak_output :Optional[bool] = False, environment_vars :Optional[Dict[str, Any]] = None, working_directory :Optional[str] = './', remove_vt100_escape_codes_from_lines :bool = True): _callbacks = {} if callbacks: for hook, func in callbacks.items(): _callbacks[hook] = func if start_callback: _callbacks['on_start'] = start_callback self.cmd = cmd self._callbacks = _callbacks self.peak_output = peak_output self.environment_vars = environment_vars self.working_directory = working_directory self.remove_vt100_escape_codes_from_lines = remove_vt100_escape_codes_from_lines self.session :Optional[SysCommandWorker] = None self.create_session() def __enter__(self) -> Optional[SysCommandWorker]: return self.session def __exit__(self, *args :str, **kwargs :Dict[str, Any]) -> None: # b''.join(sys_command('sync')) # No need to, since the underlying fs() object will call sync. # TODO: https://stackoverflow.com/questions/28157929/how-to-safely-handle-an-exception-inside-a-context-manager if len(args) >= 2 and args[1]: log(args[1], level=logging.ERROR, fg='red') def __iter__(self, *args :List[Any], **kwargs :Dict[str, Any]) -> Iterator[bytes]: if self.session: for line in self.session: yield line def __getitem__(self, key :slice) -> Optional[bytes]: if not self.session: raise KeyError(f"SysCommand() does not have an active session.") elif type(key) is slice: start = key.start if key.start else 0 end = key.stop if key.stop else len(self.session._trace_log) return self.session._trace_log[start:end] else: raise ValueError("SysCommand() doesn't have key & value pairs, only slices, SysCommand('ls')[:10] as an example.") def __repr__(self, *args :List[Any], **kwargs :Dict[str, Any]) -> str: if self.session: return self.session._trace_log.decode('UTF-8') return '' def __json__(self) -> Dict[str, Union[str, bool, List[str], Dict[str, Any], Optional[bool], Optional[Dict[str, Any]]]]: return { 'cmd': self.cmd, 'callbacks': self._callbacks, 'peak': self.peak_output, 'environment_vars': self.environment_vars, 'session': True if self.session else False } def create_session(self) -> bool: """ Initiates a :ref:`SysCommandWorker` session in this class ``.session``. It then proceeds to poll the process until it ends, after which it also clears any printed output if ``.peak_output=True``. """ if self.session: return self.session with SysCommandWorker(self.cmd, callbacks=self._callbacks, peak_output=self.peak_output, environment_vars=self.environment_vars, remove_vt100_escape_codes_from_lines=self.remove_vt100_escape_codes_from_lines) as session: if not self.session: self.session = session while self.session.ended is None: self.session.poll() if self.peak_output: sys.stdout.write('\n') sys.stdout.flush() return True def decode(self, fmt :str = 'UTF-8') -> Optional[str]: if self.session: return self.session._trace_log.decode(fmt) return None @property def exit_code(self) -> Optional[int]: if self.session: return self.session.exit_code else: return None @property def trace_log(self) -> Optional[bytes]: if self.session: return self.session._trace_log return None def prerequisite_check() -> bool: """ This function is used as a safety check before continuing with an installation. Could be anything from checking that /boot is big enough to check if nvidia hardware exists when nvidia driver was chosen. """ return True def reboot(): SysCommand("/usr/bin/reboot") def pid_exists(pid: int) -> bool: try: return any(subprocess.check_output(['/usr/bin/ps', '--no-headers', '-o', 'pid', '-p', str(pid)]).strip()) except subprocess.CalledProcessError: return False def run_custom_user_commands(commands :List[str], installation :Installer) -> None: for index, command in enumerate(commands): log(f'Executing custom command "{command}" ...', level=logging.INFO) with open(f"{installation.target}/var/tmp/user-command.{index}.sh", "w") as temp_script: temp_script.write(command) execution_output = SysCommand(f"arch-chroot {installation.target} bash /var/tmp/user-command.{index}.sh") log(execution_output) os.unlink(f"{installation.target}/var/tmp/user-command.{index}.sh") def json_stream_to_structure(id : str, stream :str, target :dict) -> bool : """ Function to load a stream (file (as name) or valid JSON string into an existing dictionary Returns true if it could be done Return false if operation could not be executed +id is just a parameter to get meaningful, but not so long messages """ from pathlib import Path if Path(stream).exists(): try: with open(Path(stream)) as fh: target.update(json.load(fh)) except Exception as e: log(f"{id} = {stream} does not contain a valid JSON format: {e}",level=logging.ERROR) return False else: log(f"{id} = {stream} does not exists in the filesystem. Trying as JSON stream",level=logging.DEBUG) # NOTE: failure of this check doesn't make stream 'real' invalid JSON, just it first level entry is not an object (i.e. dict), so it is not a format we handle. if stream.strip().startswith('{') and stream.strip().endswith('}'): try: target.update(json.loads(stream)) except Exception as e: log(f" {id} Contains an invalid JSON format : {e}",level=logging.ERROR) return False else: log(f" {id} is neither a file nor is a JSON string:",level=logging.ERROR) return False return True