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#!/usr/bin/env python3
import os
import signal
import struct
import sys
def output(line, stream=sys.stdout, print_only=False):
if isinstance(line, str):
line = line.encode("utf-8", "surrogateescape")
if not print_only:
stream.buffer.write(struct.pack("@I", len(line)))
stream.buffer.write(line)
stream.flush()
def echo_loop():
while True:
line = sys.stdin.buffer.readline()
if not line:
break
output(line)
if sys.platform == "win32":
import msvcrt
msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)
cmd = sys.argv[1]
if cmd == "echo":
echo_loop()
elif cmd == "exit":
sys.exit(int(sys.argv[2]))
elif cmd == "env":
for var in sys.argv[2:]:
output(os.environ.get(var, "!"))
elif cmd == "pwd":
output(os.path.abspath(os.curdir))
elif cmd == "print_args":
for arg in sys.argv[2:]:
output(arg)
elif cmd == "print_python_executable_path":
import psutil # not stdlib, put already part of our virtualenv.
# This returns the final executable that launched this script.
# We cannot use sys.executable because on Windows that would point to the
# python.exe parent that spawns this process.
# See getRealPythonExecutable in test_subprocess.js.
output(psutil.Process().exe())
elif cmd == "ignore_sigterm":
signal.signal(signal.SIGTERM, signal.SIG_IGN)
output("Ready")
while True:
try:
signal.pause()
except AttributeError:
import time
time.sleep(3600)
elif cmd == "close_stdin_and_wait_forever":
# Do NOT use non-stdlib modules here; this runs outside our virtualenv,
# via the program identified by print_python_executable_path.
os.close(sys.stdin.fileno())
output("stdin_closed")
while True:
pass # Test should kill the program
elif cmd == "close_pipes_and_wait_for_stdin":
os.close(sys.stdout.fileno())
os.close(sys.stderr.fileno())
sys.stdin.buffer.read(1)
elif cmd == "print":
output(sys.argv[2], stream=sys.stdout, print_only=True)
output(sys.argv[3], stream=sys.stderr, print_only=True)
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