forked from Mirror/pmbootstrap
866e5bcfab
Move pmb/parse/arch.py over to core and refactor it as an Arch type, similar to how Chroot was done. Fix all the uses (that I can find) of arch in the codebase that need adjusting. The new Arch type is an Enum, making it clear what architectures can be represented and making it much easier to reason about. Since we support ~5 (kinda) different representations of an Architecture (Alpine, Kernel, target triple, platform, and QEMU), we now formalise that the Alpine format is what we represent internally, with methods to convert to any of the others as-needed. Signed-off-by: Caleb Connolly <caleb@postmarketos.org>
409 lines
16 KiB
Python
409 lines
16 KiB
Python
# Copyright 2023 Oliver Smith
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# SPDX-License-Identifier: GPL-3.0-or-later
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import fcntl
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from pmb.core import get_context
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from pmb.core.arch import Arch
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from pmb.types import PathString, Env
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from pmb.helpers import logging
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import os
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from pathlib import Path
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import selectors
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import shlex
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import subprocess
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import sys
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import threading
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import time
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from typing import Dict, Optional, Sequence
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import pmb.helpers.run
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"""For a detailed description of all output modes, read the description of
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core() at the bottom. All other functions in this file get (indirectly)
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called by core(). """
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def flat_cmd(cmds: Sequence[Sequence[PathString]], working_dir: Optional[Path]=None, env: Env={}):
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"""Convert a shell command passed as list into a flat shell string with proper escaping.
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:param cmds: list of commands as list, e.g. ["echo", "string with spaces"]
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:param working_dir: when set, prepend "cd ...;" to execute the command
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in the given working directory
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:param env: dict of environment variables to be passed to the command, e.g.
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{"JOBS": "5"}
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:returns: the flat string, e.g.
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echo 'string with spaces'
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cd /home/pmos;echo 'string with spaces'
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"""
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# Merge env and cmd into escaped list
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escaped = []
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for key, value in env.items():
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if isinstance(value, Arch):
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value = str(value)
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escaped.append(key + "=" + shlex.quote(os.fspath(value)))
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for cmd in cmds:
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for i in range(len(cmd)):
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escaped.append(shlex.quote(os.fspath(cmd[i])))
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escaped.append(";")
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# Prepend working dir
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ret = " ".join(escaped)
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if working_dir is not None:
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ret = "cd " + shlex.quote(str(working_dir)) + ";" + ret
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return ret
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def sanity_checks(output="log", output_return=False, check=None):
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"""Raise an exception if the parameters passed to core() don't make sense.
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(all parameters are described in core() below).
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"""
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vals = ["log", "stdout", "interactive", "tui", "background", "pipe"]
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if output not in vals:
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raise RuntimeError("Invalid output value: " + str(output))
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# Prevent setting the check parameter with output="background".
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# The exit code won't be checked when running in background, so it would
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# always by check=False. But we prevent it from getting set to check=False
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# as well, so it does not look like you could change it to check=True.
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if check is not None and output == "background":
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raise RuntimeError("Can't use check with output: background")
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if output_return and output in ["tui", "background"]:
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raise RuntimeError("Can't use output_return with output: " + output)
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def background(cmd, working_dir=None):
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"""Run a subprocess in background and redirect its output to the log."""
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ret = subprocess.Popen(cmd, stdout=pmb.helpers.logging.logfd,
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stderr=pmb.helpers.logging.logfd, cwd=working_dir)
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logging.debug(f"New background process: pid={ret.pid}, output=background")
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return ret
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def pipe(cmd, working_dir=None):
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"""Run a subprocess in background and redirect its output to a pipe."""
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ret = subprocess.Popen(cmd, stdout=subprocess.PIPE,
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stdin=subprocess.DEVNULL,
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stderr=pmb.helpers.logging.logfd, cwd=working_dir)
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logging.verbose(f"New background process: pid={ret.pid}, output=pipe")
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return ret
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# FIXME (#2324): These types make no sense at all
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def pipe_read(process, output_to_stdout=False, output_return=False,
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output_return_buffer=False):
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"""Read all output from a subprocess, copy it to the log and optionally stdout and a buffer variable.
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This is only meant to be called by foreground_pipe() below.
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:param process: subprocess.Popen instance
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:param output_to_stdout: copy all output to pmbootstrap's stdout
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:param output_return: when set to True, output_return_buffer will be
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extended
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:param output_return_buffer: list of bytes that gets extended with the
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current output in case output_return is True.
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"""
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while True:
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# Copy available output
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out = process.stdout.readline()
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if len(out):
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pmb.helpers.logging.logfd.buffer.write(out)
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if output_to_stdout:
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sys.stdout.buffer.write(out)
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if output_return:
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output_return_buffer.append(out)
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continue
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# No more output (flush buffers)
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pmb.helpers.logging.logfd.flush()
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if output_to_stdout:
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sys.stdout.flush()
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return
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def kill_process_tree(pid, ppids, sudo):
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"""Recursively kill a pid and its child processes.
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:param pid: process id that will be killed
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:param ppids: list of process id and parent process id tuples (pid, ppid)
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:param sudo: use sudo to kill the process
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"""
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if sudo:
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pmb.helpers.run.root(["kill", "-9", str(pid)],
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check=False)
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else:
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pmb.helpers.run.user(["kill", "-9", str(pid)],
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check=False)
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for (child_pid, child_ppid) in ppids:
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if child_ppid == str(pid):
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kill_process_tree(child_pid, ppids, sudo)
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def kill_command(pid, sudo):
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"""Kill a command process and recursively kill its child processes.
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:param pid: process id that will be killed
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:param sudo: use sudo to kill the process
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"""
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cmd = ["ps", "-e", "-o", "pid,ppid"]
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ret = subprocess.run(cmd, check=True, stdout=subprocess.PIPE)
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ppids = []
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proc_entries = ret.stdout.decode("utf-8").rstrip().split('\n')[1:]
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for row in proc_entries:
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items = row.split()
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if len(items) != 2:
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raise RuntimeError("Unexpected ps output: " + row)
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ppids.append(items)
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kill_process_tree(pid, ppids, sudo)
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def foreground_pipe(cmd, working_dir=None, output_to_stdout=False,
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output_return=False, output_timeout=True,
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sudo=False, stdin=None):
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"""Run a subprocess in foreground with redirected output.
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Optionally kill it after being silent for too long.
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:param cmd: command as list, e.g. ["echo", "string with spaces"]
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:param working_dir: path in host system where the command should run
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:param output_to_stdout: copy all output to pmbootstrap's stdout
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:param output_return: return the output of the whole program
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:param output_timeout: kill the process when it doesn't print any output
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after a certain time (configured with --timeout)
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and raise a RuntimeError exception
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:param sudo: use sudo to kill the process when it hits the timeout
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:returns: (code, output)
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* code: return code of the program
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* output: ""
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* output: full program output string (output_return is True)
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"""
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context = pmb.core.get_context()
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# Start process in background (stdout and stderr combined)
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process = subprocess.Popen(cmd, stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT, cwd=working_dir,
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stdin=stdin)
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# Make process.stdout non-blocking
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stdout = process.stdout or None
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if not stdout:
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raise RuntimeError("Process has no stdout?!")
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handle = stdout.fileno()
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flags = fcntl.fcntl(handle, fcntl.F_GETFL)
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fcntl.fcntl(handle, fcntl.F_SETFL, flags | os.O_NONBLOCK)
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# While process exists wait for output (with timeout)
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output_buffer: list[bytes] = []
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sel = selectors.DefaultSelector()
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sel.register(stdout, selectors.EVENT_READ)
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timeout = context.command_timeout
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while process.poll() is None:
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wait_start = time.perf_counter()
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sel.select(timeout)
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# On timeout raise error (we need to measure time on our own, because
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# select() may exit early even if there is no data to read and the
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# timeout was not reached.)
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if output_timeout:
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wait_end = time.perf_counter()
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if wait_end - wait_start >= timeout:
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logging.info("Process did not write any output for " +
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str(timeout) + " seconds. Killing it.")
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logging.info("NOTE: The timeout can be increased with"
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" 'pmbootstrap -t'.")
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kill_command(process.pid, sudo)
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continue
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# Read all currently available output
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pipe_read(process, output_to_stdout, output_return,
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output_buffer)
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# There may still be output after the process quit
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pipe_read(process, output_to_stdout, output_return, output_buffer)
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# Return the return code and output (the output gets built as list of
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# output chunks and combined at the end, this is faster than extending the
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# combined string with each new chunk)
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return (process.returncode, b"".join(output_buffer).decode("utf-8"))
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def foreground_tui(cmd, working_dir=None):
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"""Run a subprocess in foreground without redirecting any of its output.
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This is the only way text-based user interfaces (ncurses programs like
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vim, nano or the kernel's menuconfig) work properly.
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"""
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logging.debug("*** output passed to pmbootstrap stdout, not to this log"
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" ***")
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process = subprocess.Popen(cmd, cwd=working_dir)
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return process.wait()
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def check_return_code(code, log_message):
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"""Check the return code of a command.
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:param code: exit code to check
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:param log_message: simplified and more readable form of the command, e.g.
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"(native) % echo test" instead of the full command with
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entering the chroot and more escaping
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:raises RuntimeError: when the code indicates that the command failed
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"""
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if code:
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logging.debug("^" * 70)
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log_file = get_context().log
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logging.info("NOTE: The failed command's output is above the ^^^ line"
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f" in the log file: {log_file}")
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raise RuntimeError(f"Command failed (exit code {str(code)}): " +
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log_message)
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def sudo_timer_iterate():
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"""Run sudo -v and schedule a new timer to repeat the same."""
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if pmb.config.which_sudo() == "sudo":
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subprocess.Popen(["sudo", "-v"]).wait()
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else:
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subprocess.Popen(pmb.config.sudo(["true"])).wait()
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timer = threading.Timer(interval=60, function=sudo_timer_iterate)
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timer.daemon = True
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timer.start()
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def sudo_timer_start():
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"""Start a timer to call sudo -v periodically, so that the password is only needed once."""
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if "sudo_timer_active" in pmb.helpers.other.cache:
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return
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pmb.helpers.other.cache["sudo_timer_active"] = True
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sudo_timer_iterate()
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def add_proxy_env_vars(env):
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"""Add proxy environment variables from host to the environment of the command we are running.
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:param env: dict of environment variables, it will be extended with all of the proxy env vars
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that are set on the host
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"""
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proxy_env_vars = [
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"FTP_PROXY",
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"HTTPS_PROXY",
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"HTTP_PROXY",
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"HTTP_PROXY_AUTH"
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"ftp_proxy",
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"http_proxy",
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"https_proxy",
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]
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for var in proxy_env_vars:
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if var in os.environ:
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env[var] = os.environ[var]
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def core(log_message, cmd, working_dir=None, output="log",
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output_return=False, check=None, sudo=False, disable_timeout=False):
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"""Run a command and create a log entry.
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This is a low level function not meant to be used directly. Use one of the
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following instead: pmb.helpers.run.user(), pmb.helpers.run.root(),
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pmb.chroot.user(), pmb.chroot.root()
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:param log_message: simplified and more readable form of the command, e.g.
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"(native) % echo test" instead of the full command with
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entering the chroot and more escaping
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:param cmd: command as list, e.g. ["echo", "string with spaces"]
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:param working_dir: path in host system where the command should run
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:param output: where to write the output (stdout and stderr) of the
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process. We almost always write to the log file, which can
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be read with "pmbootstrap log" (output values: "log",
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"stdout", "interactive", "background"), so it's easy to
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trace what pmbootstrap does.
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The exceptions are "tui" (text-based user interface), where
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it does not make sense to write to the log file (think of
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ncurses UIs, such as "menuconfig") and "pipe" where the
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output is written to a pipe for manual asynchronous
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consumption by the caller.
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When the output is not set to "interactive", "tui",
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"background" or "pipe", we kill the process if it does not
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output anything for 5 minutes (time can be set with
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"pmbootstrap --timeout").
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The table below shows all possible values along with
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their properties. "wait" indicates that we wait for the
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process to complete.
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============= ======= ========== ============= ==== ==========
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output value timeout out to log out to stdout wait pass stdin
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============= ======= ========== ============= ==== ==========
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"log" x x x
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"stdout" x x x x
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"interactive" x x x x
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"tui" x x x
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"background" x
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"pipe"
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============= ======= ========== ============= ==== ==========
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:param output_return: in addition to writing the program's output to the
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destinations above in real time, write to a buffer and return it as string when the
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command has completed. This is not possible when output is "background", "pipe" or "tui".
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:param check: an exception will be raised when the command's return code is not 0.
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Set this to False to disable the check. This parameter can not be used when the output is
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"background" or "pipe".
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:param sudo: use sudo to kill the process when it hits the timeout.
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:returns: * program's return code (default)
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* subprocess.Popen instance (output is "background" or "pipe")
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* the program's entire output (output_return is True)
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"""
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sanity_checks(output, output_return, check)
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context = pmb.core.get_context()
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if context.sudo_timer and sudo:
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sudo_timer_start()
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# Log simplified and full command (pmbootstrap -v)
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logging.debug(log_message)
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logging.verbose("run: " + str(cmd))
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# try:
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# input("Press Enter to continue...")
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# except KeyboardInterrupt as e:
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# raise e
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# Background
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if output == "background":
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return background(cmd, working_dir)
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# Pipe
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if output == "pipe":
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return pipe(cmd, working_dir)
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# Foreground
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output_after_run = ""
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if output == "tui":
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# Foreground TUI
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code = foreground_tui(cmd, working_dir)
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else:
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# Foreground pipe (always redirects to the error log file)
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output_to_stdout = False
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if not context.details_to_stdout and output in ["stdout", "interactive"]:
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output_to_stdout = True
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output_timeout = output in ["log", "stdout"] and not disable_timeout
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stdin = subprocess.DEVNULL if output in ["log", "stdout"] else None
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(code, output_after_run) = foreground_pipe(cmd, working_dir,
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output_to_stdout,
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output_return,
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output_timeout,
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sudo, stdin)
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# Check the return code
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if check is not False:
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check_return_code(code, log_message)
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# Return (code or output string)
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return output_after_run if output_return else code
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