import hashlib import json import logging import os import pty import shlex import subprocess import sys import time from datetime import datetime, date from select import epoll, EPOLLIN, EPOLLHUP from typing import Union from .exceptions import * from .output import log def gen_uid(entropy_length=256): return hashlib.sha512(os.urandom(entropy_length)).hexdigest() def multisplit(s, splitters): 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): 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.") class JsonEncoder: def _encode(obj): 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] == '!': copy[JsonEncoder._encode(key)] = '******' 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)): r = [] for item in obj: r.append(json.loads(json.dumps(item, cls=JSON))) return r else: return obj class JSON(json.JSONEncoder, json.JSONDecoder): def _encode(self, obj): return JsonEncoder._encode(obj) def encode(self, obj): return super(JSON, self).encode(self._encode(obj)) class SysCommandWorker: def __init__(self, cmd, callbacks=None, peak_output=False, environment_vars=None, logfile=None, working_directory='./'): if not callbacks: callbacks = {} if not environment_vars: environment_vars = {} if type(cmd) is str: cmd = shlex.split(cmd) 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 self.environment_vars = environment_vars self.logfile = logfile self.working_directory = working_directory self.exit_code = None self._trace_log = b'' self._trace_log_pos = 0 self.poll_object = epoll() self.child_fd = None self.started = None self.ended = None def __contains__(self, key: bytes): """ 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, **kwargs): for line in self._trace_log[self._trace_log_pos:self._trace_log.rfind(b'\n')].split(b'\n'): if line: yield line + b'\n' self._trace_log_pos = self._trace_log.rfind(b'\n') def __repr__(self): self.make_sure_we_are_executing() return str(self._trace_log) def __enter__(self): return self def __exit__(self, *args): # 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.ERROR, fg='red') if self.exit_code != 0: raise SysCallError(f"{self.cmd} exited with abnormal exit code: {self.exit_code}") def is_alive(self): self.poll() if self.started and self.ended is None: return True return False def write(self, data: bytes, line_ending=True): assert type(data) == bytes # TODO: Maybe we can support str as well and encode it self.make_sure_we_are_executing() os.write(self.child_fd, data + (b'\n' if line_ending else b'')) def make_sure_we_are_executing(self): if not self.started: return self.execute() def tell(self) -> int: self.make_sure_we_are_executing() return self._trace_log_pos def seek(self, pos): 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 output = output.strip('\r\n ') if len(output) <= 0: return False from .user_interaction import get_terminal_width # Move back to the beginning of the terminal sys.stdout.flush() sys.stdout.write("\033[%dG" % 0) sys.stdout.flush() # Clear the line sys.stdout.write(" " * get_terminal_width()) sys.stdout.flush() # Move back to the beginning again sys.stdout.flush() sys.stdout.write("\033[%dG" % 0) sys.stdout.flush() # And print the new output we're peaking on: sys.stdout.write(output) sys.stdout.flush() return True def poll(self): self.make_sure_we_are_executing() 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 as err: 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: if (old_dir := os.getcwd()) != self.working_directory: os.chdir(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) if not self.pid: try: os.execve(self.cmd[0], self.cmd, {**os.environ, **self.environment_vars}) 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='UTF-8'): return self._trace_log.decode(encoding) class SysCommand: def __init__(self, cmd, callback=None, start_callback=None, peak_output=False, environment_vars=None, working_directory='./'): _callbacks = {} if callback: _callbacks['on_end'] = callback 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.session = None self.create_session() def __enter__(self): return self.session def __exit__(self, *args, **kwargs): # 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, **kwargs): for line in self.session: yield line def __repr__(self, *args, **kwargs): return self.session._trace_log.decode('UTF-8') def __json__(self): 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): if self.session: return True try: self.session = SysCommandWorker(self.cmd, callbacks=self._callbacks, peak_output=self.peak_output, environment_vars=self.environment_vars) while self.session.ended is None: self.session.poll() except SysCallError: return False return True def decode(self, fmt='UTF-8'): return self.session._trace_log.decode(fmt) @property def exit_code(self): return self.session.exit_code @property def trace_log(self): return self.session._trace_log def prerequisite_check(): if not os.path.isdir("/sys/firmware/efi"): raise RequirementError("Archinstall only supports machines in UEFI mode.") return True def reboot(): o = b''.join(SysCommand("/usr/bin/reboot")) def pid_exists(pid: int): try: return any(subprocess.check_output(['/usr/bin/ps', '--no-headers', '-o', 'pid', '-p', str(pid)]).strip()) except subprocess.CalledProcessError: return False