Mercurial > hg
annotate tests/test-stdio.py @ 45069:9172fd511999
tests: terminate subprocess in test-stdio.py in case of exception
If an error happened while reading the output of the subprocess, the pipe / TTY
buffer can fill up and prevent that the subprocess ends. Therefore we should
terminate the subprocess in case of an exception.
author | Manuel Jacob <me@manueljacob.de> |
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date | Tue, 07 Jul 2020 12:35:29 +0200 |
parents | 8cd18aba5e6c |
children | bc05c13e246f |
rev | line source |
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1 #!/usr/bin/env python |
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2 """ |
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3 Tests the buffering behavior of stdio streams in `mercurial.utils.procutil`. |
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4 """ |
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5 from __future__ import absolute_import |
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6 |
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7 import contextlib |
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8 import errno |
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9 import os |
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10 import subprocess |
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11 import sys |
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12 import unittest |
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13 |
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14 from mercurial import pycompat |
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15 |
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16 |
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17 CHILD_PROCESS = r''' |
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18 import os |
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19 |
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20 from mercurial import dispatch |
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21 from mercurial.utils import procutil |
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22 |
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23 dispatch.initstdio() |
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24 procutil.{stream}.write(b'aaa') |
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25 os.write(procutil.{stream}.fileno(), b'[written aaa]') |
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26 procutil.{stream}.write(b'bbb\n') |
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27 os.write(procutil.{stream}.fileno(), b'[written bbb\\n]') |
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28 ''' |
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29 UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]' |
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30 LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]' |
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31 FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n' |
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32 |
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33 |
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34 @contextlib.contextmanager |
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35 def _closing(fds): |
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36 try: |
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37 yield |
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38 finally: |
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39 for fd in fds: |
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40 try: |
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41 os.close(fd) |
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42 except EnvironmentError: |
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43 pass |
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44 |
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45 |
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46 @contextlib.contextmanager |
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47 def _pipes(): |
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48 rwpair = os.pipe() |
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49 with _closing(rwpair): |
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50 yield rwpair |
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51 |
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52 |
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53 @contextlib.contextmanager |
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54 def _ptys(): |
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55 if pycompat.iswindows: |
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56 raise unittest.SkipTest("PTYs are not supported on Windows") |
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57 import pty |
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58 import tty |
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59 |
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60 rwpair = pty.openpty() |
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61 with _closing(rwpair): |
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62 tty.setraw(rwpair[0]) |
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63 yield rwpair |
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64 |
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65 |
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66 def _readall(fd, buffer_size): |
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67 buf = [] |
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68 while True: |
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69 try: |
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70 s = os.read(fd, buffer_size) |
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71 except OSError as e: |
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72 if e.errno == errno.EIO: |
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73 # If the child-facing PTY got closed, reading from the |
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74 # parent-facing PTY raises EIO. |
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75 break |
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76 raise |
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77 if not s: |
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78 break |
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79 buf.append(s) |
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80 return b''.join(buf) |
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81 |
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82 |
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83 class TestStdio(unittest.TestCase): |
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84 def _test(self, stream, rwpair_generator, expected_output, python_args=[]): |
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85 assert stream in ('stdout', 'stderr') |
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86 with rwpair_generator() as (stream_receiver, child_stream), open( |
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87 os.devnull, 'rb' |
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88 ) as child_stdin: |
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89 proc = subprocess.Popen( |
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90 [sys.executable] |
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91 + python_args |
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92 + ['-c', CHILD_PROCESS.format(stream=stream)], |
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93 stdin=child_stdin, |
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94 stdout=child_stream if stream == 'stdout' else None, |
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95 stderr=child_stream if stream == 'stderr' else None, |
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96 ) |
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97 try: |
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98 os.close(child_stream) |
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99 self.assertEqual( |
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100 _readall(stream_receiver, 1024), expected_output |
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101 ) |
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102 except: # re-raises |
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103 proc.terminate() |
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104 raise |
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105 finally: |
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106 retcode = proc.wait() |
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107 self.assertEqual(retcode, 0) |
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108 |
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109 def test_stdout_pipes(self): |
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110 self._test('stdout', _pipes, FULLY_BUFFERED) |
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111 |
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112 def test_stdout_ptys(self): |
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113 self._test('stdout', _ptys, LINE_BUFFERED) |
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114 |
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115 def test_stdout_pipes_unbuffered(self): |
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116 self._test('stdout', _pipes, UNBUFFERED, python_args=['-u']) |
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117 |
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118 def test_stdout_ptys_unbuffered(self): |
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119 self._test('stdout', _ptys, UNBUFFERED, python_args=['-u']) |
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120 |
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121 if not pycompat.ispy3 and not pycompat.iswindows: |
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122 # On Python 2 on non-Windows, we manually open stdout in line-buffered |
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123 # mode if connected to a TTY. We should check if Python was configured |
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124 # to use unbuffered stdout, but it's hard to do that. |
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125 test_stdout_ptys_unbuffered = unittest.expectedFailure( |
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126 test_stdout_ptys_unbuffered |
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127 ) |
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128 |
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129 def test_stderr_pipes(self): |
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130 self._test('stderr', _pipes, UNBUFFERED) |
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131 |
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132 def test_stderr_ptys(self): |
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133 self._test('stderr', _ptys, UNBUFFERED) |
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134 |
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135 def test_stderr_pipes_unbuffered(self): |
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136 self._test('stderr', _pipes, UNBUFFERED, python_args=['-u']) |
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137 |
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138 def test_stderr_ptys_unbuffered(self): |
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139 self._test('stderr', _ptys, UNBUFFERED, python_args=['-u']) |
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140 |
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141 |
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142 if __name__ == '__main__': |
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143 import silenttestrunner |
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144 |
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145 silenttestrunner.main(__name__) |