Jan Lindemann
048726a1aa
Commands executed by ExecContext and its derived classes don't populate the "cmd" parameter of "Result"'s constructor. Fixing that makes for nicer error messages.
Signed-off-by: Jan Lindemann <jan@janware.com>
681 lines
22 KiB
Python
681 lines
22 KiB
Python
from __future__ import annotations
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import abc
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import errno
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import sys
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from decimal import ROUND_FLOOR, Decimal
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from typing import TYPE_CHECKING, NamedTuple
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if TYPE_CHECKING:
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from typing import Type
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from types import TracebackType
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from .base import Input, InputMode, Result, StatResult
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from .FileContext import FileContext as Base
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from .log import DEBUG, ERR, NOTICE, log
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_US = '\x1f' # unlikely to appear in numeric output
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_BILLION = Decimal(1_000_000_000)
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def _looks_like_option_error(stderr: str | None) -> bool:
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if stderr is None:
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return False
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s = stderr.lower()
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return any(
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needle in s for needle in (
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'unrecognized option',
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'illegal option',
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'unknown option',
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'invalid option',
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'option requires an argument', )
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)
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def _raise_stat_error(path: str, result: Result) -> None:
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stderr = result.stderr_str_or_none or f'stat exited with status {result.status}'
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msg = stderr.strip()
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lower = msg.lower()
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if 'no such file' in lower:
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raise FileNotFoundError(errno.ENOENT, msg, path)
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if 'permission denied' in lower or 'operation not permitted' in lower:
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raise PermissionError(errno.EACCES, msg, path)
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raise OSError(errno.EIO, msg, path)
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def _parse_epoch(value: str) -> tuple[int, float, int]:
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"""
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Convert a decimal epoch timestamp string into:
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(integer seconds for tuple slot, float seconds for attribute, ns for *_ns)
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"""
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dec = Decimal(value.strip())
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sec = int(dec.to_integral_value(rounding = ROUND_FLOOR))
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ns = int((dec * _BILLION).to_integral_value(rounding = ROUND_FLOOR))
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return sec, float(dec), ns
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def _build_stat_result(fields: list[str], mode_base: int) -> StatResult:
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if len(fields) != 13:
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raise ValueError(
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f'unexpected stat output: expected 13 fields, got {len(fields)}: {fields!r}'
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)
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(
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mode_s,
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ino_s,
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dev_s,
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nlink_s,
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uid_s,
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gid_s,
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size_s,
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atime_s,
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mtime_s,
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ctime_s,
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blksize_s,
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blocks_s,
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rdev_s,
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) = fields
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st_mode = int(mode_s, mode_base)
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# st_ino = int(ino_s)
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# st_dev = int(dev_s)
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# st_nlink = int(nlink_s)
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st_uid = uid_s
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st_gid = gid_s
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st_size = int(size_s)
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st_atime_i, st_atime_f, st_atime_ns = _parse_epoch(atime_s)
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st_mtime_i, st_mtime_f, st_mtime_ns = _parse_epoch(mtime_s)
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st_ctime_i, st_ctime_f, st_ctime_ns = _parse_epoch(ctime_s)
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# st_blksize = int(blksize_s)
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# st_blocks = int(blocks_s)
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# st_rdev = int(rdev_s)
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return StatResult(
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mode = st_mode,
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owner = st_uid,
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group = st_gid,
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size = st_size,
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atime = st_atime_i,
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mtime = st_mtime_i,
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ctime = st_ctime_i,
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)
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class ExecContext(Base):
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class CallContext:
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def __init__(
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self,
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parent: ExecContext,
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title: str | None,
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cmd: list[str],
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cmd_input: Input,
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mod_env: dict[str, str] | None,
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wd: str | None,
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log_prefix: str,
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throw: bool,
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verbose: bool | None,
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) -> None:
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self.__cmd = cmd
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self.__wd = wd
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self.__log_prefix = log_prefix
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self.__parent = parent
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self.__pretty_cmd: str | None = None
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self.__title = (
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title if title else f'{parent.uri}: Running {self.pretty_cmd} -'
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)
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self.__delim = f'---- {self.__title} -'
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delim_len = 120
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self.__delim += '-' * max(0, delim_len - len(self.__delim))
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self.__mod_env = {'LC_ALL': 'C'} if mod_env is None else mod_env
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self.__cmd_input: bytes | None = None
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# -- At the end of this dance, interactive needs to be either True
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# or False
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interactive: bool | None = None
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cmd_input_bytes: None | bytes
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if isinstance(cmd_input, InputMode):
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cmd_input_bytes = None
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match cmd_input:
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case InputMode.Interactive:
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interactive = True
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case InputMode.NonInteractive:
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interactive = False
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case InputMode.OptInteractive:
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interactive = parent.interactive
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case InputMode.Auto:
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interactive = sys.stdin.isatty()
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if interactive is None:
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interactive = parent.interactive
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if interactive is None:
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interactive = sys.stdin.isatty()
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else:
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interactive = False
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if cmd_input is None:
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cmd_input_bytes = None
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elif isinstance(cmd_input, str):
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cmd_input_bytes = cmd_input.encode(sys.stdout.encoding or 'utf-8')
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else:
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cmd_input_bytes = cmd_input
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self.__cmd_input = cmd_input_bytes
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assert interactive in [True, False], f'Invalid: interactive = {interactive}'
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self.__interactive = interactive
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self.__throw = throw
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self.__verbose = verbose if verbose is not None else parent.verbose_default
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def __enter__(self) -> ExecContext.CallContext:
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self.log_delim(start = True)
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return self
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def __exit__(
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self,
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exc_type: Type[BaseException] | None,
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exc_value: BaseException | None,
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traceback: TracebackType | None,
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) -> None:
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self.log_delim(start = False)
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@property
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def log_prefix(self) -> str:
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return self.__log_prefix
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@property
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def interactive(self) -> bool:
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return self.__interactive
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@property
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def verbose(self) -> bool:
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return self.__verbose
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@property
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def cmd_input(self) -> bytes | None:
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return self.__cmd_input
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@property
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def mod_env(self) -> dict[str, str]:
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return self.__mod_env
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@property
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def throw(self) -> bool:
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return self.__throw
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@property
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def wd(self) -> str | None:
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return self.__wd
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@property
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def cmd(self) -> list[str]:
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return self.__cmd
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@property
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def pretty_cmd(self) -> str:
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if self.__pretty_cmd is None:
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from .util import pretty_cmd
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self.__pretty_cmd = pretty_cmd(self.__cmd, self.__wd)
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return self.__pretty_cmd
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def log(self, prio: int, *args, **kwargs) -> None:
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log(prio, self.__log_prefix, *args, **kwargs)
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def log_delim(self, start: bool) -> None:
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if not self.__verbose:
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return None
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if self.__interactive: # Don't log footer in interative mode
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if start:
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log(NOTICE, self.__delim)
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return
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delim = ',' + self.__delim + ' >' if start else '`' + self.__delim + ' <'
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log(NOTICE, delim)
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def check_exit_code(self, result: Result) -> None:
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if result.status == 0:
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return
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if self.__throw or self.__verbose:
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if self.__throw:
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raise RuntimeError(result.summary)
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def exception(self, result: Result, e: Exception) -> Result:
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log(ERR, self.__log_prefix, f'Failed to run {self.pretty_cmd}')
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if self.__throw:
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raise e
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return result
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@classmethod
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def __mode_str(cls, mode: int) -> str:
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return f'{mode:0o}'
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def __init__(self, *args, **kwargs) -> None:
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super().__init__(*args, **kwargs)
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@classmethod
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def create(cls, *args, **kwargs) -> ExecContext:
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ret = super().create(*args, **kwargs)
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if not isinstance(ret, cls):
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raise TypeError(f'Expected {cls.__name__}, got {type(ret).__name__}')
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return ret
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@abc.abstractmethod
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async def _run(
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self,
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cmd: list[str],
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wd: str | None,
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verbose: bool,
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cmd_input: bytes | None,
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mod_env: dict[str, str] | None,
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interactive: bool,
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log_prefix: str,
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) -> Result:
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raise NotImplementedError('Called pure virtual method _run()')
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async def run(
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self,
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cmd: list[str],
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wd: str | None = None,
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throw: bool = True,
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verbose: bool | None = None,
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cmd_input: Input = InputMode.OptInteractive,
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mod_env: dict[str, str] | None = None,
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title: str | None = None,
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) -> Result:
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"""
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Run a command asynchronously and return its output
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Args:
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cmd: Command and arguments
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wd: Optional working directory
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throw: Raise an exception on non-zero exit status if True
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verbose: Emit log output while the command runs
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cmd_input:
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- "InputMode.OptInteractive" -> Let --interactive govern how to handle
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interactivity (default)
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- "InputMode.Interactive" -> Inherit terminal stdin
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- "InputMode.Auto" -> Inherit terminal stdin if it is a TTY
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- "InputMode.NonInteractive" -> stdin from /dev/null
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- None -> Alias for InputMode.NonInteractive
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- otherwise -> Feed cmd_input to stdin
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mod_env: Change set to command's environment:
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- key: val adds a variable,
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- key: None removes it
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Returns:
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A Result instance
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In PTY mode stderr is always None because PTY merges stdout/stderr.
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"""
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# Note that in the calls to the wrapped method, cmd_input == None can
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# be returned by CallContext and is very much allowed
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assert cmd_input is not None, 'Invalid: cmd_input is None'
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# Enclose multiple run() calls in an additional open() / close() pair
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# if you want the context to stay open between the calls
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await self.open()
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try:
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ret = Result(cmd = cmd)
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with self.CallContext(
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self,
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title = title,
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cmd = cmd,
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cmd_input = cmd_input,
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mod_env = mod_env,
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wd = wd,
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log_prefix = '|',
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throw = throw,
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verbose = verbose,
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) as cc:
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try:
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ret = await self._run(
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cmd = cc.cmd,
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wd = wd,
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verbose = cc.verbose,
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cmd_input = cc.cmd_input,
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mod_env = cc.mod_env,
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interactive = cc.interactive,
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log_prefix = cc.log_prefix,
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)
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except Exception as e:
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return cc.exception(ret, e)
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cc.check_exit_code(ret)
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finally:
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await self.close()
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return ret
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async def _sudo(
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self,
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cmd: list[str],
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opts: list[str] | None,
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wd: str | None,
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mod_env_sudo: dict[str, str] | None,
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mod_env_cmd: dict[str, str] | None,
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cmd_input: bytes | None,
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verbose: bool,
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interactive: bool,
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log_prefix: str,
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) -> Result:
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def __check_equal_values(d1: dict[str, str], d2: dict[str, str]) -> None:
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for key, val in d1.items():
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if d2.get(key, None) not in [None, val]:
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raise ValueError(
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'Outer and inner environments differ at least for '
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f'{key}: "{val}" != "{d2.get(key)}"'
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)
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fw_cmd: list[str] = []
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fw_env: dict[str, str] = {}
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if opts is None:
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opts = []
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if mod_env_cmd:
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fw_env.update(mod_env_cmd)
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if self.username != 'root':
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if mod_env_sudo and mod_env_cmd:
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__check_equal_values(mod_env_sudo, mod_env_cmd)
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__check_equal_values(mod_env_cmd, mod_env_sudo)
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fw_cmd.append('/usr/bin/sudo')
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if mod_env_sudo:
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fw_env.update(mod_env_sudo)
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if mod_env_cmd:
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fw_cmd.append('--preserve-env=' + ','.join(mod_env_cmd.keys()))
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if wd is not None:
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opts.extend(['-D', wd])
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wd = None
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fw_cmd.extend(opts)
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mod_env = fw_env if fw_env else None
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fw_cmd.extend(cmd)
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return await self._run(
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fw_cmd,
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wd = wd,
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mod_env = mod_env,
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verbose = verbose,
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cmd_input = cmd_input,
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interactive = interactive,
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log_prefix = log_prefix,
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)
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async def sudo(
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self,
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cmd: list[str],
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opts: list[str] | None = None,
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wd: str | None = None,
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mod_env_sudo: dict[str, str] | None = None,
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mod_env_cmd: dict[str, str] | None = None,
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throw: bool = True,
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verbose: bool | None = None,
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cmd_input: Input = InputMode.OptInteractive,
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title: str | None = None,
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) -> Result:
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# Note that in the calls to the wrapped method, cmd_input == None can
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# be returned by CallContext and is very much allowed
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assert cmd_input is not None, 'Invalid: cmd_input is None'
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ret = Result(cmd = cmd)
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with self.CallContext(
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self,
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title = title,
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cmd = cmd,
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cmd_input = cmd_input,
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mod_env = mod_env_cmd,
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wd = wd,
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log_prefix = '|',
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throw = throw,
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verbose = verbose,
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) as cc:
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try:
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ret = await self._sudo(
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cmd = cc.cmd,
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opts = opts,
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wd = cc.wd,
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mod_env_sudo = mod_env_sudo,
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mod_env_cmd = cc.mod_env,
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verbose = cc.verbose,
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cmd_input = cc.cmd_input,
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interactive = cc.interactive,
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log_prefix = cc.log_prefix,
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)
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except Exception as e:
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return cc.exception(ret, e)
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cc.check_exit_code(ret)
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return ret
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async def _get(
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self, path: str, wd: str | None, throw: bool, verbose: bool | None, title: str
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) -> Result:
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ret = Result()
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if wd is not None:
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path = wd + '/' + path
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with self.CallContext(
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self,
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title = title,
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cmd = ['cat', path],
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cmd_input = InputMode.NonInteractive,
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wd = None,
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mod_env = None,
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log_prefix = '|',
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throw = throw,
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verbose = verbose,
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) as cc:
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try:
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ret = await self._run(
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cmd = cc.cmd,
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wd = wd,
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verbose = cc.verbose,
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cmd_input = cc.cmd_input,
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mod_env = cc.mod_env,
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interactive = cc.interactive,
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log_prefix = cc.log_prefix,
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)
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except Exception as e:
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return cc.exception(ret, e)
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if ret.matches_error('No such file'):
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raise FileNotFoundError(ret.summarize(cc.cmd, wd = cc.wd))
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cc.check_exit_code(ret)
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return ret
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async def _put(
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self,
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path: str,
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content: bytes,
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wd: str | None,
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throw: bool,
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verbose: bool | None,
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title: str,
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owner: str | None,
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group: str | None,
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mode: str | None,
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atomic: bool,
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) -> Result:
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from .util import pretty_cmd
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async def __run(
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cmd: list[str],
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cmd_input: Input = InputMode.NonInteractive,
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**kwargs
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) -> Result:
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return await self.run(cmd, cmd_input = cmd_input, **kwargs)
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ret = Result()
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try:
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class RemoteCmd(NamedTuple):
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cmd: list[str]
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cmd_input: Input = InputMode.NonInteractive
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tmp_file: str | None = None
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if wd is not None:
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path = wd + '/' + path
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cmds: list[RemoteCmd] = []
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out = path
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if atomic:
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out = (await __run(['mktemp', path + '.XXXXXX'])).stdout_str.strip()
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tmp_file = out
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cmds.append(RemoteCmd(
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cmd = ['tee', out],
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cmd_input = content,
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))
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if owner is not None and group is not None:
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cmds.append(RemoteCmd(
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cmd = ['chown', f'{owner}:{group}', out],
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))
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elif owner is not None:
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cmds.append(RemoteCmd(
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cmd = ['chown', owner, out],
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))
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elif group is not None:
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cmds.append(RemoteCmd(
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cmd = ['chgrp', group, out],
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))
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if mode is not None:
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cmds.append(RemoteCmd(
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cmd = ['chmod', mode, out],
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))
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if atomic:
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cmds.append(RemoteCmd(
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|
cmd = ['mv', out, path],
|
|
))
|
|
await self.open()
|
|
try:
|
|
for cmd in cmds:
|
|
log(DEBUG, f'{self.log_name}: Running {pretty_cmd(cmd.cmd, wd)}')
|
|
ret = await __run(cmd.cmd, cmd_input = cmd.cmd_input)
|
|
tmp_file = None # Has been successfully moved at this point
|
|
return ret
|
|
finally:
|
|
if tmp_file is not None:
|
|
await self.erase(tmp_file)
|
|
await self.close()
|
|
except Exception as e:
|
|
msg = f'Failed to get {path} from {self.root} ({str(e)})'
|
|
if throw:
|
|
raise Exception(msg)
|
|
log(ERR, msg)
|
|
return ret
|
|
|
|
async def _unlink(self, path: str) -> None:
|
|
cmd = ['rm', '-f', path]
|
|
await self.run(cmd, cmd_input = InputMode.NonInteractive)
|
|
|
|
async def _erase(self, path: str) -> None:
|
|
cmd = ['rm', '-rf', path]
|
|
await self.run(cmd, cmd_input = InputMode.NonInteractive)
|
|
|
|
async def _rename(self, src: str, dst: str) -> None:
|
|
cmd = ['mv', src, dst]
|
|
await self.run(cmd, cmd_input = InputMode.NonInteractive)
|
|
|
|
async def _mkdir(self, path: str, mode: int) -> None:
|
|
cmd = ['mkdir', path, '-m', self.__mode_str(mode)]
|
|
await self.run(cmd, cmd_input = InputMode.NonInteractive)
|
|
|
|
async def _mktemp(self, tmpl: str, directory: bool) -> str:
|
|
cmd = ['mktemp']
|
|
if directory:
|
|
cmd.append('-d')
|
|
cmd.append(tmpl)
|
|
result = await self.run(cmd, cmd_input = InputMode.NonInteractive, throw = True)
|
|
if result.status != 0 or result.stdout is None:
|
|
raise Exception(
|
|
f'Failed to create temporary file on {self.root}: {result.summary}'
|
|
)
|
|
return result.stdout_str.strip()
|
|
|
|
async def _stat(self, path: str, follow_symlinks: bool) -> StatResult:
|
|
|
|
async def __stat(opts: list[str]) -> Result:
|
|
mod_env = {'LC_ALL': 'C'}
|
|
cmd = ['stat']
|
|
if follow_symlinks:
|
|
cmd.append('-L')
|
|
cmd.extend(opts)
|
|
cmd.append(path)
|
|
return await self.run(
|
|
cmd,
|
|
mod_env = mod_env,
|
|
throw = False,
|
|
cmd_input = InputMode.NonInteractive
|
|
)
|
|
|
|
# GNU coreutils stat
|
|
gnu_format = _US.join(
|
|
[
|
|
'%f', # st_mode in hex
|
|
'%i', # st_ino
|
|
'%d', # st_dev
|
|
'%h', # st_nlink
|
|
'%U', # st_uid
|
|
'%G', # st_gid
|
|
'%s', # st_size
|
|
'%.9X', # st_atime
|
|
'%.9Y', # st_mtime
|
|
'%.9Z', # st_ctime
|
|
'%o', # st_blksize hint
|
|
'%b', # st_blocks
|
|
'%r', # st_rdev
|
|
]
|
|
)
|
|
|
|
result = await __stat(['--printf', gnu_format])
|
|
if result.status == 0 and result.stdout is not None:
|
|
return _build_stat_result(result.stdout_str.split(_US), mode_base = 16)
|
|
|
|
if not _looks_like_option_error(result.stderr_str_or_none):
|
|
# log(DEBUG, f'GNU stat attempt failed on "{path}" ({str(e)})')
|
|
_raise_stat_error(path, result)
|
|
|
|
# BSD / macOS / OpenBSD / NetBSD stat
|
|
bsd_format = _US.join(
|
|
[
|
|
'%p', # st_mode in octal
|
|
'%i', # st_ino
|
|
'%d', # st_dev
|
|
'%l', # st_nlink
|
|
'%U', # st_uid
|
|
'%G', # st_gid
|
|
'%z', # st_size
|
|
'%.9Fa', # st_atime
|
|
'%.9Fm', # st_mtime
|
|
'%.9Fc', # st_ctime
|
|
'%k', # st_blksize
|
|
'%b', # st_blocks
|
|
'%r', # st_rdev
|
|
]
|
|
)
|
|
|
|
result = await __stat(['-n', '-f', bsd_format])
|
|
stdout = result.stdout_str_or_none
|
|
if result.status != 0 or stdout is None:
|
|
_raise_stat_error(path, result)
|
|
assert stdout is not None # Just there to pacify the linter
|
|
return _build_stat_result(stdout.rstrip('\n').split(_US), mode_base = 8)
|
|
|
|
async def _chown(self, path: str, owner: str | None, group: str | None) -> None:
|
|
if owner is None and group is None:
|
|
raise ValueError(f'Tried to chown("{path}") without owner and group')
|
|
if group is None:
|
|
ownership = owner
|
|
elif owner is None:
|
|
ownership = ':' + group
|
|
else:
|
|
ownership = owner + ':' + group
|
|
assert ownership is not None # Impossible, just there to calm the linter
|
|
await self.run(['chown', ownership, path], cmd_input = InputMode.NonInteractive)
|
|
|
|
async def _chmod(self, path: str, mode: int) -> None:
|
|
await self.run(
|
|
['chmod', self.__mode_str(mode), path],
|
|
cmd_input = InputMode.NonInteractive
|
|
)
|