author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 307 | c6bca38c1cbf |
permissions | -rw-r--r-- |
307
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1 |
import os |
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2 |
import sys |
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3 |
import py |
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4 |
import tempfile |
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5 |
|
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6 |
try: |
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7 |
from io import StringIO |
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8 |
except ImportError: |
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9 |
from StringIO import StringIO |
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10 |
|
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11 |
if sys.version_info < (3,0): |
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12 |
class TextIO(StringIO): |
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13 |
def write(self, data): |
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14 |
if not isinstance(data, unicode): |
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15 |
data = unicode(data, getattr(self, '_encoding', 'UTF-8')) |
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16 |
StringIO.write(self, data) |
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17 |
else: |
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18 |
TextIO = StringIO |
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19 |
|
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20 |
try: |
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21 |
from io import BytesIO |
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except ImportError: |
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class BytesIO(StringIO): |
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24 |
def write(self, data): |
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25 |
if isinstance(data, unicode): |
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raise TypeError("not a byte value: %r" %(data,)) |
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27 |
StringIO.write(self, data) |
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28 |
|
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patchsysdict = {0: 'stdin', 1: 'stdout', 2: 'stderr'} |
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|
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class FDCapture: |
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32 |
""" Capture IO to/from a given os-level filedescriptor. """ |
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|
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def __init__(self, targetfd, tmpfile=None, now=True, patchsys=False): |
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35 |
""" save targetfd descriptor, and open a new |
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36 |
temporary file there. If no tmpfile is |
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37 |
specified a tempfile.Tempfile() will be opened |
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38 |
in text mode. |
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""" |
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40 |
self.targetfd = targetfd |
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41 |
if tmpfile is None and targetfd != 0: |
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42 |
f = tempfile.TemporaryFile('wb+') |
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tmpfile = dupfile(f, encoding="UTF-8") |
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44 |
f.close() |
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self.tmpfile = tmpfile |
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46 |
self._savefd = os.dup(self.targetfd) |
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if patchsys: |
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48 |
self._oldsys = getattr(sys, patchsysdict[targetfd]) |
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49 |
if now: |
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50 |
self.start() |
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51 |
|
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def start(self): |
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try: |
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54 |
os.fstat(self._savefd) |
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except OSError: |
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56 |
raise ValueError("saved filedescriptor not valid, " |
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57 |
"did you call start() twice?") |
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if self.targetfd == 0 and not self.tmpfile: |
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59 |
fd = os.open(devnullpath, os.O_RDONLY) |
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60 |
os.dup2(fd, 0) |
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61 |
os.close(fd) |
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62 |
if hasattr(self, '_oldsys'): |
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63 |
setattr(sys, patchsysdict[self.targetfd], DontReadFromInput()) |
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64 |
else: |
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65 |
os.dup2(self.tmpfile.fileno(), self.targetfd) |
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66 |
if hasattr(self, '_oldsys'): |
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67 |
setattr(sys, patchsysdict[self.targetfd], self.tmpfile) |
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68 |
|
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69 |
def done(self): |
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70 |
""" unpatch and clean up, returns the self.tmpfile (file object) |
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71 |
""" |
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72 |
os.dup2(self._savefd, self.targetfd) |
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73 |
os.close(self._savefd) |
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74 |
if self.targetfd != 0: |
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75 |
self.tmpfile.seek(0) |
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76 |
if hasattr(self, '_oldsys'): |
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77 |
setattr(sys, patchsysdict[self.targetfd], self._oldsys) |
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78 |
return self.tmpfile |
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79 |
|
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80 |
def writeorg(self, data): |
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81 |
""" write a string to the original file descriptor |
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82 |
""" |
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83 |
tempfp = tempfile.TemporaryFile() |
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84 |
try: |
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85 |
os.dup2(self._savefd, tempfp.fileno()) |
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86 |
tempfp.write(data) |
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87 |
finally: |
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88 |
tempfp.close() |
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89 |
|
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90 |
|
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91 |
def dupfile(f, mode=None, buffering=0, raising=False, encoding=None): |
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92 |
""" return a new open file object that's a duplicate of f |
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93 |
|
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94 |
mode is duplicated if not given, 'buffering' controls |
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95 |
buffer size (defaulting to no buffering) and 'raising' |
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96 |
defines whether an exception is raised when an incompatible |
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97 |
file object is passed in (if raising is False, the file |
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98 |
object itself will be returned) |
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99 |
""" |
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100 |
try: |
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101 |
fd = f.fileno() |
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102 |
except AttributeError: |
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103 |
if raising: |
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104 |
raise |
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105 |
return f |
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106 |
newfd = os.dup(fd) |
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107 |
mode = mode and mode or f.mode |
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108 |
if sys.version_info >= (3,0): |
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109 |
if encoding is not None: |
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110 |
mode = mode.replace("b", "") |
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111 |
buffering = True |
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112 |
return os.fdopen(newfd, mode, buffering, encoding, closefd=True) |
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113 |
else: |
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114 |
f = os.fdopen(newfd, mode, buffering) |
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115 |
if encoding is not None: |
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116 |
return EncodedFile(f, encoding) |
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117 |
return f |
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118 |
|
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119 |
class EncodedFile(object): |
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120 |
def __init__(self, _stream, encoding): |
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121 |
self._stream = _stream |
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122 |
self.encoding = encoding |
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123 |
|
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124 |
def write(self, obj): |
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125 |
if isinstance(obj, unicode): |
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126 |
obj = obj.encode(self.encoding) |
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127 |
elif isinstance(obj, str): |
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128 |
pass |
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129 |
else: |
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130 |
obj = str(obj) |
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131 |
self._stream.write(obj) |
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132 |
|
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133 |
def writelines(self, linelist): |
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134 |
data = ''.join(linelist) |
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135 |
self.write(data) |
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136 |
|
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137 |
def __getattr__(self, name): |
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138 |
return getattr(self._stream, name) |
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139 |
|
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140 |
class Capture(object): |
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141 |
def call(cls, func, *args, **kwargs): |
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142 |
""" return a (res, out, err) tuple where |
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143 |
out and err represent the output/error output |
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144 |
during function execution. |
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145 |
call the given function with args/kwargs |
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146 |
and capture output/error during its execution. |
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147 |
""" |
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148 |
so = cls() |
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149 |
try: |
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150 |
res = func(*args, **kwargs) |
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151 |
finally: |
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152 |
out, err = so.reset() |
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153 |
return res, out, err |
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154 |
call = classmethod(call) |
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155 |
|
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156 |
def reset(self): |
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|
157 |
""" reset sys.stdout/stderr and return captured output as strings. """ |
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|
158 |
if hasattr(self, '_reset'): |
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|
159 |
raise ValueError("was already reset") |
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|
160 |
self._reset = True |
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|
161 |
outfile, errfile = self.done(save=False) |
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|
162 |
out, err = "", "" |
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|
163 |
if outfile and not outfile.closed: |
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|
164 |
out = outfile.read() |
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|
165 |
outfile.close() |
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|
166 |
if errfile and errfile != outfile and not errfile.closed: |
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|
167 |
err = errfile.read() |
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|
168 |
errfile.close() |
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|
169 |
return out, err |
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|
170 |
|
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|
171 |
def suspend(self): |
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|
172 |
""" return current snapshot captures, memorize tempfiles. """ |
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|
173 |
outerr = self.readouterr() |
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|
174 |
outfile, errfile = self.done() |
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|
175 |
return outerr |
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|
176 |
|
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|
177 |
|
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|
178 |
class StdCaptureFD(Capture): |
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|
179 |
""" This class allows to capture writes to FD1 and FD2 |
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180 |
and may connect a NULL file to FD0 (and prevent |
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|
181 |
reads from sys.stdin). If any of the 0,1,2 file descriptors |
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|
182 |
is invalid it will not be captured. |
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|
183 |
""" |
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|
184 |
def __init__(self, out=True, err=True, mixed=False, |
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|
185 |
in_=True, patchsys=True, now=True): |
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|
186 |
self._options = locals() |
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|
187 |
self._save() |
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|
188 |
if now: |
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|
189 |
self.startall() |
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|
190 |
|
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|
191 |
def _save(self): |
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|
192 |
in_ = self._options['in_'] |
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|
193 |
out = self._options['out'] |
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|
194 |
err = self._options['err'] |
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|
195 |
mixed = self._options['mixed'] |
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|
196 |
patchsys = self._options['patchsys'] |
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|
197 |
if in_: |
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|
198 |
try: |
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|
199 |
self.in_ = FDCapture(0, tmpfile=None, now=False, |
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|
200 |
patchsys=patchsys) |
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|
201 |
except OSError: |
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|
202 |
pass |
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|
203 |
if out: |
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|
204 |
tmpfile = None |
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|
205 |
if hasattr(out, 'write'): |
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|
206 |
tmpfile = out |
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|
207 |
try: |
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|
208 |
self.out = FDCapture(1, tmpfile=tmpfile, |
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|
209 |
now=False, patchsys=patchsys) |
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|
210 |
self._options['out'] = self.out.tmpfile |
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|
211 |
except OSError: |
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|
212 |
pass |
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|
213 |
if err: |
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|
214 |
if out and mixed: |
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|
215 |
tmpfile = self.out.tmpfile |
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changeset
|
216 |
elif hasattr(err, 'write'): |
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|
217 |
tmpfile = err |
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|
218 |
else: |
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|
219 |
tmpfile = None |
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|
220 |
try: |
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|
221 |
self.err = FDCapture(2, tmpfile=tmpfile, |
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|
222 |
now=False, patchsys=patchsys) |
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|
223 |
self._options['err'] = self.err.tmpfile |
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|
224 |
except OSError: |
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|
225 |
pass |
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|
226 |
|
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|
227 |
def startall(self): |
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|
228 |
if hasattr(self, 'in_'): |
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|
229 |
self.in_.start() |
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|
230 |
if hasattr(self, 'out'): |
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|
231 |
self.out.start() |
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|
232 |
if hasattr(self, 'err'): |
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|
233 |
self.err.start() |
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|
234 |
|
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|
235 |
def resume(self): |
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|
236 |
""" resume capturing with original temp files. """ |
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|
237 |
self.startall() |
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|
238 |
|
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|
239 |
def done(self, save=True): |
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|
240 |
""" return (outfile, errfile) and stop capturing. """ |
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|
241 |
outfile = errfile = None |
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|
242 |
if hasattr(self, 'out') and not self.out.tmpfile.closed: |
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|
243 |
outfile = self.out.done() |
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|
244 |
if hasattr(self, 'err') and not self.err.tmpfile.closed: |
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245 |
errfile = self.err.done() |
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|
246 |
if hasattr(self, 'in_'): |
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|
247 |
tmpfile = self.in_.done() |
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|
248 |
if save: |
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|
249 |
self._save() |
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250 |
return outfile, errfile |
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251 |
|
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|
252 |
def readouterr(self): |
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|
253 |
""" return snapshot value of stdout/stderr capturings. """ |
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|
254 |
l = [] |
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255 |
for name in ('out', 'err'): |
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|
256 |
res = "" |
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257 |
if hasattr(self, name): |
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258 |
f = getattr(self, name).tmpfile |
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259 |
f.seek(0) |
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260 |
res = f.read() |
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|
261 |
f.truncate(0) |
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|
262 |
f.seek(0) |
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|
263 |
l.append(res) |
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|
264 |
return l |
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265 |
|
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|
266 |
class StdCapture(Capture): |
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|
267 |
""" This class allows to capture writes to sys.stdout|stderr "in-memory" |
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|
268 |
and will raise errors on tries to read from sys.stdin. It only |
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269 |
modifies sys.stdout|stderr|stdin attributes and does not |
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270 |
touch underlying File Descriptors (use StdCaptureFD for that). |
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|
271 |
""" |
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272 |
def __init__(self, out=True, err=True, in_=True, mixed=False, now=True): |
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273 |
self._oldout = sys.stdout |
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|
274 |
self._olderr = sys.stderr |
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|
275 |
self._oldin = sys.stdin |
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changeset
|
276 |
if out and not hasattr(out, 'file'): |
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|
277 |
out = TextIO() |
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|
278 |
self.out = out |
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|
279 |
if err: |
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changeset
|
280 |
if mixed: |
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|
281 |
err = out |
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changeset
|
282 |
elif not hasattr(err, 'write'): |
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|
283 |
err = TextIO() |
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changeset
|
284 |
self.err = err |
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|
285 |
self.in_ = in_ |
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changeset
|
286 |
if now: |
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changeset
|
287 |
self.startall() |
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|
288 |
|
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|
289 |
def startall(self): |
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|
290 |
if self.out: |
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|
291 |
sys.stdout = self.out |
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changeset
|
292 |
if self.err: |
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changeset
|
293 |
sys.stderr = self.err |
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changeset
|
294 |
if self.in_: |
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|
295 |
sys.stdin = self.in_ = DontReadFromInput() |
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changeset
|
296 |
|
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|
297 |
def done(self, save=True): |
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changeset
|
298 |
""" return (outfile, errfile) and stop capturing. """ |
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Added buildout stuff and made changes accordingly
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changeset
|
299 |
outfile = errfile = None |
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changeset
|
300 |
if self.out and not self.out.closed: |
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changeset
|
301 |
sys.stdout = self._oldout |
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changeset
|
302 |
outfile = self.out |
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changeset
|
303 |
outfile.seek(0) |
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Added buildout stuff and made changes accordingly
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changeset
|
304 |
if self.err and not self.err.closed: |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
305 |
sys.stderr = self._olderr |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
306 |
errfile = self.err |
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Added buildout stuff and made changes accordingly
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changeset
|
307 |
errfile.seek(0) |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
308 |
if self.in_: |
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diff
changeset
|
309 |
sys.stdin = self._oldin |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
310 |
return outfile, errfile |
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Added buildout stuff and made changes accordingly
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changeset
|
311 |
|
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changeset
|
312 |
def resume(self): |
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diff
changeset
|
313 |
""" resume capturing with original temp files. """ |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
314 |
self.startall() |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
315 |
|
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diff
changeset
|
316 |
def readouterr(self): |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
317 |
""" return snapshot value of stdout/stderr capturings. """ |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
318 |
out = err = "" |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
319 |
if self.out: |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
320 |
out = self.out.getvalue() |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
321 |
self.out.truncate(0) |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
322 |
self.out.seek(0) |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
323 |
if self.err: |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
324 |
err = self.err.getvalue() |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
325 |
self.err.truncate(0) |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
326 |
self.err.seek(0) |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
327 |
return out, err |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
328 |
|
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Added buildout stuff and made changes accordingly
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diff
changeset
|
329 |
class DontReadFromInput: |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
330 |
"""Temporary stub class. Ideally when stdin is accessed, the |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
331 |
capturing should be turned off, with possibly all data captured |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
332 |
so far sent to the screen. This should be configurable, though, |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
333 |
because in automated test runs it is better to crash than |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
334 |
hang indefinitely. |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
335 |
""" |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
336 |
def read(self, *args): |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
337 |
raise IOError("reading from stdin while output is captured") |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
338 |
readline = read |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
339 |
readlines = read |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
340 |
__iter__ = read |
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Added buildout stuff and made changes accordingly
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changeset
|
341 |
|
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diff
changeset
|
342 |
def fileno(self): |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
343 |
raise ValueError("redirected Stdin is pseudofile, has no fileno()") |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
344 |
def isatty(self): |
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diff
changeset
|
345 |
return False |
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changeset
|
346 |
def close(self): |
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diff
changeset
|
347 |
pass |
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changeset
|
348 |
|
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diff
changeset
|
349 |
try: |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
350 |
devnullpath = os.devnull |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
351 |
except AttributeError: |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
352 |
if os.name == 'nt': |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
353 |
devnullpath = 'NUL' |
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parents:
diff
changeset
|
354 |
else: |
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diff
changeset
|
355 |
devnullpath = '/dev/null' |