Mercurial > hg
annotate tests/test-stdio.py @ 45659:a475db79d84d
changing-files: add a "salvaged" set to track file that were not removed
We need this set for the copy tracing algorithm. See documentation for details
about this set.
Differential Revision: https://phab.mercurial-scm.org/D9118
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 14 Sep 2020 23:46:21 +0200 |
parents | a37f290a7124 |
children | c102b704edb5 |
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 signal |
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11 import subprocess |
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12 import sys |
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13 import tempfile |
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14 import unittest |
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15 |
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16 from mercurial import pycompat, util |
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17 |
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18 |
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19 if pycompat.ispy3: |
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20 |
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21 def set_noninheritable(fd): |
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22 # On Python 3, file descriptors are non-inheritable by default. |
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23 pass |
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24 |
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25 |
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26 else: |
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27 if pycompat.iswindows: |
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28 # unused |
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29 set_noninheritable = None |
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30 else: |
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31 import fcntl |
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32 |
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33 def set_noninheritable(fd): |
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34 old = fcntl.fcntl(fd, fcntl.F_GETFD) |
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35 fcntl.fcntl(fd, fcntl.F_SETFD, old | fcntl.FD_CLOEXEC) |
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36 |
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37 |
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38 TEST_BUFFERING_CHILD_SCRIPT = r''' |
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39 import os |
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40 |
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41 from mercurial import dispatch |
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42 from mercurial.utils import procutil |
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43 |
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44 dispatch.initstdio() |
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45 procutil.{stream}.write(b'aaa') |
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46 os.write(procutil.{stream}.fileno(), b'[written aaa]') |
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47 procutil.{stream}.write(b'bbb\n') |
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48 os.write(procutil.{stream}.fileno(), b'[written bbb\\n]') |
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49 ''' |
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50 UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]' |
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51 LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]' |
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52 FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n' |
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53 |
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54 |
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55 TEST_LARGE_WRITE_CHILD_SCRIPT = r''' |
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56 import os |
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57 import signal |
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58 import sys |
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59 |
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60 from mercurial import dispatch |
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61 from mercurial.utils import procutil |
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62 |
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63 signal.signal(signal.SIGINT, lambda *x: None) |
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64 dispatch.initstdio() |
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65 write_result = procutil.{stream}.write(b'x' * 1048576) |
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66 with os.fdopen( |
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67 os.open({write_result_fn!r}, os.O_WRONLY | getattr(os, 'O_TEMPORARY', 0)), |
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68 'w', |
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69 ) as write_result_f: |
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70 write_result_f.write(str(write_result)) |
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71 ''' |
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72 |
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73 |
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74 TEST_BROKEN_PIPE_CHILD_SCRIPT = r''' |
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75 import os |
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76 import pickle |
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77 |
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78 from mercurial import dispatch |
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79 from mercurial.utils import procutil |
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80 |
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81 dispatch.initstdio() |
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82 procutil.stdin.read(1) # wait until parent process closed pipe |
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83 try: |
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84 procutil.{stream}.write(b'test') |
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85 procutil.{stream}.flush() |
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86 except EnvironmentError as e: |
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87 with os.fdopen( |
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88 os.open( |
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89 {err_fn!r}, |
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90 os.O_WRONLY |
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91 | getattr(os, 'O_BINARY', 0) |
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92 | getattr(os, 'O_TEMPORARY', 0), |
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93 ), |
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94 'wb', |
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95 ) as err_f: |
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96 pickle.dump(e, err_f) |
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97 # Exit early to suppress further broken pipe errors at interpreter shutdown. |
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98 os._exit(0) |
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99 ''' |
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100 |
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101 |
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102 @contextlib.contextmanager |
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103 def _closing(fds): |
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104 try: |
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105 yield |
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106 finally: |
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107 for fd in fds: |
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108 try: |
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109 os.close(fd) |
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110 except EnvironmentError: |
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111 pass |
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112 |
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113 |
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114 # In the following, we set the FDs non-inheritable mainly to make it possible |
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115 # for tests to close the receiving end of the pipe / PTYs. |
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116 |
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117 |
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118 @contextlib.contextmanager |
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119 def _devnull(): |
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120 devnull = os.open(os.devnull, os.O_WRONLY) |
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121 # We don't have a receiving end, so it's not worth the effort on Python 2 |
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122 # on Windows to make the FD non-inheritable. |
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123 with _closing([devnull]): |
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124 yield (None, devnull) |
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125 |
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126 |
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127 @contextlib.contextmanager |
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128 def _pipes(): |
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129 rwpair = os.pipe() |
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130 # Pipes are already non-inheritable on Windows. |
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131 if not pycompat.iswindows: |
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132 set_noninheritable(rwpair[0]) |
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133 set_noninheritable(rwpair[1]) |
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134 with _closing(rwpair): |
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135 yield rwpair |
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136 |
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137 |
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138 @contextlib.contextmanager |
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139 def _ptys(): |
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140 if pycompat.iswindows: |
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141 raise unittest.SkipTest("PTYs are not supported on Windows") |
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142 import pty |
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143 import tty |
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144 |
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145 rwpair = pty.openpty() |
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146 set_noninheritable(rwpair[0]) |
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147 set_noninheritable(rwpair[1]) |
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148 with _closing(rwpair): |
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149 tty.setraw(rwpair[0]) |
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150 yield rwpair |
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151 |
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152 |
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153 def _readall(fd, buffer_size, initial_buf=None): |
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154 buf = initial_buf or [] |
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155 while True: |
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156 try: |
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157 s = os.read(fd, buffer_size) |
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158 except OSError as e: |
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159 if e.errno == errno.EIO: |
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160 # If the child-facing PTY got closed, reading from the |
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161 # parent-facing PTY raises EIO. |
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162 break |
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163 raise |
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164 if not s: |
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165 break |
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166 buf.append(s) |
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167 return b''.join(buf) |
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168 |
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169 |
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170 class TestStdio(unittest.TestCase): |
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171 def _test( |
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172 self, |
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173 child_script, |
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174 stream, |
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175 rwpair_generator, |
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176 check_output, |
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177 python_args=[], |
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178 post_child_check=None, |
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179 stdin_generator=None, |
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180 ): |
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181 assert stream in ('stdout', 'stderr') |
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182 if stdin_generator is None: |
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183 stdin_generator = open(os.devnull, 'rb') |
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184 with rwpair_generator() as ( |
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185 stream_receiver, |
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186 child_stream, |
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187 ), stdin_generator as child_stdin: |
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188 proc = subprocess.Popen( |
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189 [sys.executable] + python_args + ['-c', child_script], |
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190 stdin=child_stdin, |
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191 stdout=child_stream if stream == 'stdout' else None, |
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192 stderr=child_stream if stream == 'stderr' else None, |
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193 ) |
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194 try: |
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195 os.close(child_stream) |
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196 if stream_receiver is not None: |
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197 check_output(stream_receiver, proc) |
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198 except: # re-raises |
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199 proc.terminate() |
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200 raise |
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201 finally: |
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202 retcode = proc.wait() |
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203 self.assertEqual(retcode, 0) |
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204 if post_child_check is not None: |
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205 post_child_check() |
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206 |
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207 def _test_buffering( |
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208 self, stream, rwpair_generator, expected_output, python_args=[] |
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209 ): |
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210 def check_output(stream_receiver, proc): |
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211 self.assertEqual(_readall(stream_receiver, 1024), expected_output) |
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212 |
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213 self._test( |
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214 TEST_BUFFERING_CHILD_SCRIPT.format(stream=stream), |
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215 stream, |
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216 rwpair_generator, |
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217 check_output, |
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218 python_args, |
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219 ) |
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220 |
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221 def test_buffering_stdout_devnull(self): |
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222 self._test_buffering('stdout', _devnull, None) |
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223 |
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224 def test_buffering_stdout_pipes(self): |
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225 self._test_buffering('stdout', _pipes, FULLY_BUFFERED) |
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226 |
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227 def test_buffering_stdout_ptys(self): |
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228 self._test_buffering('stdout', _ptys, LINE_BUFFERED) |
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229 |
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230 def test_buffering_stdout_devnull_unbuffered(self): |
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231 self._test_buffering('stdout', _devnull, None, python_args=['-u']) |
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232 |
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233 def test_buffering_stdout_pipes_unbuffered(self): |
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234 self._test_buffering('stdout', _pipes, UNBUFFERED, python_args=['-u']) |
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235 |
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236 def test_buffering_stdout_ptys_unbuffered(self): |
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237 self._test_buffering('stdout', _ptys, UNBUFFERED, python_args=['-u']) |
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238 |
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239 if not pycompat.ispy3 and not pycompat.iswindows: |
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240 # On Python 2 on non-Windows, we manually open stdout in line-buffered |
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241 # mode if connected to a TTY. We should check if Python was configured |
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242 # to use unbuffered stdout, but it's hard to do that. |
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243 test_buffering_stdout_ptys_unbuffered = unittest.expectedFailure( |
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244 test_buffering_stdout_ptys_unbuffered |
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245 ) |
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246 |
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247 def _test_large_write(self, stream, rwpair_generator, python_args=[]): |
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248 if not pycompat.ispy3 and pycompat.isdarwin: |
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249 # Python 2 doesn't always retry on EINTR, but the libc might retry. |
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250 # So far, it was observed only on macOS that EINTR is raised at the |
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251 # Python level. As Python 2 support will be dropped soon-ish, we |
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252 # won't attempt to fix it. |
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253 raise unittest.SkipTest("raises EINTR on macOS") |
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254 |
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255 def check_output(stream_receiver, proc): |
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256 if not pycompat.iswindows: |
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257 # On Unix, we can provoke a partial write() by interrupting it |
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258 # by a signal handler as soon as a bit of data was written. |
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259 # We test that write() is called until all data is written. |
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260 buf = [os.read(stream_receiver, 1)] |
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261 proc.send_signal(signal.SIGINT) |
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262 else: |
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263 # On Windows, there doesn't seem to be a way to cause partial |
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264 # writes. |
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265 buf = [] |
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266 self.assertEqual( |
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267 _readall(stream_receiver, 131072, buf), b'x' * 1048576 |
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268 ) |
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269 |
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270 def post_child_check(): |
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271 write_result_str = write_result_f.read() |
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272 if pycompat.ispy3: |
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273 # On Python 3, we test that the correct number of bytes is |
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274 # claimed to have been written. |
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275 expected_write_result_str = '1048576' |
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276 else: |
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277 # On Python 2, we only check that the large write does not |
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278 # crash. |
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279 expected_write_result_str = 'None' |
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280 self.assertEqual(write_result_str, expected_write_result_str) |
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281 |
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282 with tempfile.NamedTemporaryFile('r') as write_result_f: |
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283 self._test( |
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284 TEST_LARGE_WRITE_CHILD_SCRIPT.format( |
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285 stream=stream, write_result_fn=write_result_f.name |
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286 ), |
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287 stream, |
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288 rwpair_generator, |
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289 check_output, |
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290 python_args, |
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291 post_child_check=post_child_check, |
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292 ) |
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293 |
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294 def test_large_write_stdout_devnull(self): |
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295 self._test_large_write('stdout', _devnull) |
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296 |
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297 def test_large_write_stdout_pipes(self): |
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298 self._test_large_write('stdout', _pipes) |
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299 |
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300 def test_large_write_stdout_ptys(self): |
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301 self._test_large_write('stdout', _ptys) |
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302 |
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303 def test_large_write_stdout_devnull_unbuffered(self): |
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304 self._test_large_write('stdout', _devnull, python_args=['-u']) |
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305 |
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306 def test_large_write_stdout_pipes_unbuffered(self): |
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307 self._test_large_write('stdout', _pipes, python_args=['-u']) |
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308 |
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309 def test_large_write_stdout_ptys_unbuffered(self): |
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310 self._test_large_write('stdout', _ptys, python_args=['-u']) |
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311 |
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312 def test_large_write_stderr_devnull(self): |
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313 self._test_large_write('stderr', _devnull) |
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314 |
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315 def test_large_write_stderr_pipes(self): |
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316 self._test_large_write('stderr', _pipes) |
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317 |
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318 def test_large_write_stderr_ptys(self): |
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319 self._test_large_write('stderr', _ptys) |
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320 |
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321 def test_large_write_stderr_devnull_unbuffered(self): |
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322 self._test_large_write('stderr', _devnull, python_args=['-u']) |
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323 |
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324 def test_large_write_stderr_pipes_unbuffered(self): |
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325 self._test_large_write('stderr', _pipes, python_args=['-u']) |
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326 |
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327 def test_large_write_stderr_ptys_unbuffered(self): |
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328 self._test_large_write('stderr', _ptys, python_args=['-u']) |
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329 |
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330 def _test_broken_pipe(self, stream): |
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331 assert stream in ('stdout', 'stderr') |
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332 |
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333 def check_output(stream_receiver, proc): |
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334 os.close(stream_receiver) |
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335 proc.stdin.write(b'x') |
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336 proc.stdin.close() |
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337 |
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338 def post_child_check(): |
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339 err = util.pickle.load(err_f) |
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340 self.assertEqual(err.errno, errno.EPIPE) |
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341 self.assertEqual(err.strerror, "Broken pipe") |
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342 |
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343 with tempfile.NamedTemporaryFile('rb') as err_f: |
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344 self._test( |
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345 TEST_BROKEN_PIPE_CHILD_SCRIPT.format( |
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346 stream=stream, err_fn=err_f.name |
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347 ), |
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348 stream, |
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349 _pipes, |
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350 check_output, |
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351 post_child_check=post_child_check, |
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352 stdin_generator=util.nullcontextmanager(subprocess.PIPE), |
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353 ) |
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354 |
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355 def test_broken_pipe_stdout(self): |
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356 self._test_broken_pipe('stdout') |
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357 |
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358 def test_broken_pipe_stderr(self): |
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359 self._test_broken_pipe('stderr') |
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360 |
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361 |
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362 if __name__ == '__main__': |
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363 import silenttestrunner |
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364 |
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365 silenttestrunner.main(__name__) |