59 lines
1.3 KiB
Python
59 lines
1.3 KiB
Python
import os
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import pty
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import termios
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import pytest
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EOF = b'\x04'
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def ttyflags(fd):
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"""normalize tty i/o for testing"""
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# see:
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# http://www.gnu.org/software/libc/manual/html_mono/libc.html#Output-Modes
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attrs = termios.tcgetattr(fd)
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attrs[1] &= ~termios.OPOST # don't munge output
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attrs[3] &= ~termios.ECHO # don't echo input
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termios.tcsetattr(fd, termios.TCSANOW, attrs)
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def readall(fd):
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"""read until EOF"""
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result = b''
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while True:
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try:
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chunk = os.read(fd, 1 << 10)
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except OSError as error:
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if error.errno == 5: # linux pty EOF
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return result
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else:
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raise
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if chunk == '':
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return result
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else:
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result += chunk
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def _test(fd):
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"""write to tac via the pty and verify its output"""
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ttyflags(fd)
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assert os.write(fd, b'1\n2\n3\n') == 6
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assert os.write(fd, EOF * 2) == 2
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output = readall(fd)
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assert output == b'3\n2\n1\n', repr(output)
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print('PASS')
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# disable debug output so it doesn't break our assertion
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@pytest.mark.usefixtures('debug_disabled')
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def test_tty():
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"""
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Ensure processes wrapped by dumb-init can write successfully, given a tty
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"""
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pid, fd = pty.fork()
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if pid == 0:
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os.execvp('dumb-init', ('dumb-init', 'tac'))
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else:
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_test(fd)
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