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1 | """Pexpect is a Python module for spawning child applications and controlling |
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1 | """Pexpect is a Python module for spawning child applications and controlling | |
2 | them automatically. Pexpect can be used for automating interactive applications |
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2 | them automatically. Pexpect can be used for automating interactive applications | |
3 | such as ssh, ftp, passwd, telnet, etc. It can be used to a automate setup |
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3 | such as ssh, ftp, passwd, telnet, etc. It can be used to a automate setup | |
4 | scripts for duplicating software package installations on different servers. It |
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4 | scripts for duplicating software package installations on different servers. It | |
5 | can be used for automated software testing. Pexpect is in the spirit of Don |
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5 | can be used for automated software testing. Pexpect is in the spirit of Don | |
6 | Libes' Expect, but Pexpect is pure Python. Other Expect-like modules for Python |
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6 | Libes' Expect, but Pexpect is pure Python. Other Expect-like modules for Python | |
7 | require TCL and Expect or require C extensions to be compiled. Pexpect does not |
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7 | require TCL and Expect or require C extensions to be compiled. Pexpect does not | |
8 | use C, Expect, or TCL extensions. It should work on any platform that supports |
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8 | use C, Expect, or TCL extensions. It should work on any platform that supports | |
9 | the standard Python pty module. The Pexpect interface focuses on ease of use so |
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9 | the standard Python pty module. The Pexpect interface focuses on ease of use so | |
10 | that simple tasks are easy. |
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10 | that simple tasks are easy. | |
11 |
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11 | |||
12 | There are two main interfaces to the Pexpect system; these are the function, |
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12 | There are two main interfaces to the Pexpect system; these are the function, | |
13 | run() and the class, spawn. The spawn class is more powerful. The run() |
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13 | run() and the class, spawn. The spawn class is more powerful. The run() | |
14 | function is simpler than spawn, and is good for quickly calling program. When |
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14 | function is simpler than spawn, and is good for quickly calling program. When | |
15 | you call the run() function it executes a given program and then returns the |
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15 | you call the run() function it executes a given program and then returns the | |
16 | output. This is a handy replacement for os.system(). |
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16 | output. This is a handy replacement for os.system(). | |
17 |
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17 | |||
18 | For example:: |
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18 | For example:: | |
19 |
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19 | |||
20 | pexpect.run('ls -la') |
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20 | pexpect.run('ls -la') | |
21 |
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21 | |||
22 | The spawn class is the more powerful interface to the Pexpect system. You can |
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22 | The spawn class is the more powerful interface to the Pexpect system. You can | |
23 | use this to spawn a child program then interact with it by sending input and |
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23 | use this to spawn a child program then interact with it by sending input and | |
24 | expecting responses (waiting for patterns in the child's output). |
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24 | expecting responses (waiting for patterns in the child's output). | |
25 |
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25 | |||
26 | For example:: |
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26 | For example:: | |
27 |
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27 | |||
28 | child = pexpect.spawn('scp foo myname@host.example.com:.') |
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28 | child = pexpect.spawn('scp foo myname@host.example.com:.') | |
29 | child.expect ('Password:') |
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29 | child.expect ('Password:') | |
30 | child.sendline (mypassword) |
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30 | child.sendline (mypassword) | |
31 |
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31 | |||
32 | This works even for commands that ask for passwords or other input outside of |
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32 | This works even for commands that ask for passwords or other input outside of | |
33 | the normal stdio streams. For example, ssh reads input directly from the TTY |
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33 | the normal stdio streams. For example, ssh reads input directly from the TTY | |
34 | device which bypasses stdin. |
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34 | device which bypasses stdin. | |
35 |
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35 | |||
36 | Credits: Noah Spurrier, Richard Holden, Marco Molteni, Kimberley Burchett, |
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36 | Credits: Noah Spurrier, Richard Holden, Marco Molteni, Kimberley Burchett, | |
37 | Robert Stone, Hartmut Goebel, Chad Schroeder, Erick Tryzelaar, Dave Kirby, Ids |
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37 | Robert Stone, Hartmut Goebel, Chad Schroeder, Erick Tryzelaar, Dave Kirby, Ids | |
38 | vander Molen, George Todd, Noel Taylor, Nicolas D. Cesar, Alexander Gattin, |
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38 | vander Molen, George Todd, Noel Taylor, Nicolas D. Cesar, Alexander Gattin, | |
39 | Jacques-Etienne Baudoux, Geoffrey Marshall, Francisco Lourenco, Glen Mabey, |
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39 | Jacques-Etienne Baudoux, Geoffrey Marshall, Francisco Lourenco, Glen Mabey, | |
40 | Karthik Gurusamy, Fernando Perez, Corey Minyard, Jon Cohen, Guillaume |
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40 | Karthik Gurusamy, Fernando Perez, Corey Minyard, Jon Cohen, Guillaume | |
41 | Chazarain, Andrew Ryan, Nick Craig-Wood, Andrew Stone, Jorgen Grahn, John |
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41 | Chazarain, Andrew Ryan, Nick Craig-Wood, Andrew Stone, Jorgen Grahn, John | |
42 | Spiegel, Jan Grant, Shane Kerr and Thomas Kluyver. Let me know if I forgot anyone. |
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42 | Spiegel, Jan Grant, Shane Kerr and Thomas Kluyver. Let me know if I forgot anyone. | |
43 |
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43 | |||
44 | Pexpect is free, open source, and all that good stuff. |
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44 | Pexpect is free, open source, and all that good stuff. | |
45 |
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45 | |||
46 | Permission is hereby granted, free of charge, to any person obtaining a copy of |
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46 | Permission is hereby granted, free of charge, to any person obtaining a copy of | |
47 | this software and associated documentation files (the "Software"), to deal in |
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47 | this software and associated documentation files (the "Software"), to deal in | |
48 | the Software without restriction, including without limitation the rights to |
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48 | the Software without restriction, including without limitation the rights to | |
49 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies |
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49 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies | |
50 | of the Software, and to permit persons to whom the Software is furnished to do |
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50 | of the Software, and to permit persons to whom the Software is furnished to do | |
51 | so, subject to the following conditions: |
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51 | so, subject to the following conditions: | |
52 |
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52 | |||
53 | The above copyright notice and this permission notice shall be included in all |
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53 | The above copyright notice and this permission notice shall be included in all | |
54 | copies or substantial portions of the Software. |
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54 | copies or substantial portions of the Software. | |
55 |
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55 | |||
56 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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56 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
57 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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57 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
58 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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58 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
59 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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59 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
60 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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60 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
61 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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61 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
62 | SOFTWARE. |
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62 | SOFTWARE. | |
63 |
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63 | |||
64 | Pexpect Copyright (c) 2010 Noah Spurrier |
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64 | Pexpect Copyright (c) 2010 Noah Spurrier | |
65 | http://pexpect.sourceforge.net/ |
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65 | http://pexpect.sourceforge.net/ | |
66 | """ |
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66 | """ | |
67 |
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67 | |||
68 | try: |
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68 | try: | |
69 | import os, sys, time |
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69 | import os, sys, time | |
70 | import select |
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70 | import select | |
71 | import re |
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71 | import re | |
72 | import struct |
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72 | import struct | |
73 | import resource |
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73 | import resource | |
74 | import types |
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74 | import types | |
75 | import pty |
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75 | import pty | |
76 | import tty |
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76 | import tty | |
77 | import termios |
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77 | import termios | |
78 | import fcntl |
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78 | import fcntl | |
79 | import errno |
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79 | import errno | |
80 | import traceback |
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80 | import traceback | |
81 | import signal |
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81 | import signal | |
82 | except ImportError, e: |
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82 | except ImportError, e: | |
83 | raise ImportError (str(e) + """ |
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83 | raise ImportError (str(e) + """ | |
84 |
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84 | |||
85 | A critical module was not found. Probably this operating system does not |
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85 | A critical module was not found. Probably this operating system does not | |
86 | support it. Pexpect is intended for UNIX-like operating systems.""") |
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86 | support it. Pexpect is intended for UNIX-like operating systems.""") | |
87 |
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87 | |||
88 | __version__ = '2.6.dev' |
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88 | __version__ = '2.6.dev' | |
89 | version = __version__ |
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89 | version = __version__ | |
90 | version_info = (2,6,'dev') |
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90 | version_info = (2,6,'dev') | |
91 | __all__ = ['ExceptionPexpect', 'EOF', 'TIMEOUT', 'spawn', 'run', 'which', |
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91 | __all__ = ['ExceptionPexpect', 'EOF', 'TIMEOUT', 'spawn', 'spawnb', 'run', 'which', | |
92 | 'split_command_line', '__version__'] |
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92 | 'split_command_line', '__version__'] | |
93 |
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93 | |||
94 | # Exception classes used by this module. |
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94 | # Exception classes used by this module. | |
95 | class ExceptionPexpect(Exception): |
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95 | class ExceptionPexpect(Exception): | |
96 |
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96 | |||
97 | """Base class for all exceptions raised by this module. |
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97 | """Base class for all exceptions raised by this module. | |
98 | """ |
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98 | """ | |
99 |
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99 | |||
100 | def __init__(self, value): |
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100 | def __init__(self, value): | |
101 |
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101 | |||
102 | self.value = value |
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102 | self.value = value | |
103 |
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103 | |||
104 | def __str__(self): |
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104 | def __str__(self): | |
105 |
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105 | |||
106 | return str(self.value) |
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106 | return str(self.value) | |
107 |
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107 | |||
108 | def get_trace(self): |
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108 | def get_trace(self): | |
109 |
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109 | |||
110 | """This returns an abbreviated stack trace with lines that only concern |
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110 | """This returns an abbreviated stack trace with lines that only concern | |
111 | the caller. In other words, the stack trace inside the Pexpect module |
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111 | the caller. In other words, the stack trace inside the Pexpect module | |
112 | is not included. """ |
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112 | is not included. """ | |
113 |
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113 | |||
114 | tblist = traceback.extract_tb(sys.exc_info()[2]) |
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114 | tblist = traceback.extract_tb(sys.exc_info()[2]) | |
115 | #tblist = filter(self.__filter_not_pexpect, tblist) |
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115 | #tblist = filter(self.__filter_not_pexpect, tblist) | |
116 | tblist = [item for item in tblist if self.__filter_not_pexpect(item)] |
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116 | tblist = [item for item in tblist if self.__filter_not_pexpect(item)] | |
117 | tblist = traceback.format_list(tblist) |
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117 | tblist = traceback.format_list(tblist) | |
118 | return ''.join(tblist) |
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118 | return ''.join(tblist) | |
119 |
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119 | |||
120 | def __filter_not_pexpect(self, trace_list_item): |
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120 | def __filter_not_pexpect(self, trace_list_item): | |
121 |
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121 | |||
122 | """This returns True if list item 0 the string 'pexpect.py' in it. """ |
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122 | """This returns True if list item 0 the string 'pexpect.py' in it. """ | |
123 |
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123 | |||
124 | if trace_list_item[0].find('pexpect.py') == -1: |
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124 | if trace_list_item[0].find('pexpect.py') == -1: | |
125 | return True |
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125 | return True | |
126 | else: |
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126 | else: | |
127 | return False |
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127 | return False | |
128 |
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128 | |||
129 | class EOF(ExceptionPexpect): |
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129 | class EOF(ExceptionPexpect): | |
130 |
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130 | |||
131 | """Raised when EOF is read from a child. This usually means the child has exited.""" |
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131 | """Raised when EOF is read from a child. This usually means the child has exited.""" | |
132 |
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132 | |||
133 | class TIMEOUT(ExceptionPexpect): |
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133 | class TIMEOUT(ExceptionPexpect): | |
134 |
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134 | |||
135 | """Raised when a read time exceeds the timeout. """ |
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135 | """Raised when a read time exceeds the timeout. """ | |
136 |
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136 | |||
137 | ##class TIMEOUT_PATTERN(TIMEOUT): |
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137 | ##class TIMEOUT_PATTERN(TIMEOUT): | |
138 | ## """Raised when the pattern match time exceeds the timeout. |
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138 | ## """Raised when the pattern match time exceeds the timeout. | |
139 | ## This is different than a read TIMEOUT because the child process may |
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139 | ## This is different than a read TIMEOUT because the child process may | |
140 | ## give output, thus never give a TIMEOUT, but the output |
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140 | ## give output, thus never give a TIMEOUT, but the output | |
141 | ## may never match a pattern. |
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141 | ## may never match a pattern. | |
142 | ## """ |
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142 | ## """ | |
143 | ##class MAXBUFFER(ExceptionPexpect): |
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143 | ##class MAXBUFFER(ExceptionPexpect): | |
144 | ## """Raised when a scan buffer fills before matching an expected pattern.""" |
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144 | ## """Raised when a scan buffer fills before matching an expected pattern.""" | |
145 |
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145 | |||
146 | PY3 = (sys.version_info[0] >= 3) |
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146 | PY3 = (sys.version_info[0] >= 3) | |
147 |
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147 | |||
148 | def _cast_bytes(s, enc): |
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148 | def _cast_bytes(s, enc): | |
149 | if isinstance(s, unicode): |
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149 | if isinstance(s, unicode): | |
150 | return s.encode(enc) |
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150 | return s.encode(enc) | |
151 | return s |
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151 | return s | |
152 |
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152 | |||
153 | def _cast_unicode(s, enc): |
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153 | def _cast_unicode(s, enc): | |
154 | if isinstance(s, bytes): |
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154 | if isinstance(s, bytes): | |
155 | return s.decode(enc) |
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155 | return s.decode(enc) | |
156 | return s |
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156 | return s | |
157 |
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157 | |||
158 | re_type = type(re.compile('')) |
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158 | re_type = type(re.compile('')) | |
159 |
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159 | |||
160 | def run (command, timeout=-1, withexitstatus=False, events=None, extra_args=None, |
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160 | def run (command, timeout=-1, withexitstatus=False, events=None, extra_args=None, | |
161 | logfile=None, cwd=None, env=None, encoding='utf-8'): |
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161 | logfile=None, cwd=None, env=None, encoding='utf-8'): | |
162 |
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162 | |||
163 | """ |
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163 | """ | |
164 | This function runs the given command; waits for it to finish; then |
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164 | This function runs the given command; waits for it to finish; then | |
165 | returns all output as a string. STDERR is included in output. If the full |
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165 | returns all output as a string. STDERR is included in output. If the full | |
166 | path to the command is not given then the path is searched. |
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166 | path to the command is not given then the path is searched. | |
167 |
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167 | |||
168 | Note that lines are terminated by CR/LF (\\r\\n) combination even on |
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168 | Note that lines are terminated by CR/LF (\\r\\n) combination even on | |
169 | UNIX-like systems because this is the standard for pseudo ttys. If you set |
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169 | UNIX-like systems because this is the standard for pseudo ttys. If you set | |
170 | 'withexitstatus' to true, then run will return a tuple of (command_output, |
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170 | 'withexitstatus' to true, then run will return a tuple of (command_output, | |
171 | exitstatus). If 'withexitstatus' is false then this returns just |
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171 | exitstatus). If 'withexitstatus' is false then this returns just | |
172 | command_output. |
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172 | command_output. | |
173 |
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173 | |||
174 | The run() function can often be used instead of creating a spawn instance. |
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174 | The run() function can often be used instead of creating a spawn instance. | |
175 | For example, the following code uses spawn:: |
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175 | For example, the following code uses spawn:: | |
176 |
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176 | |||
177 | from pexpect import * |
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177 | from pexpect import * | |
178 | child = spawn('scp foo myname@host.example.com:.') |
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178 | child = spawn('scp foo myname@host.example.com:.') | |
179 | child.expect ('(?i)password') |
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179 | child.expect ('(?i)password') | |
180 | child.sendline (mypassword) |
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180 | child.sendline (mypassword) | |
181 |
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181 | |||
182 | The previous code can be replace with the following:: |
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182 | The previous code can be replace with the following:: | |
183 |
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183 | |||
184 | from pexpect import * |
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184 | from pexpect import * | |
185 | run ('scp foo myname@host.example.com:.', events={'(?i)password': mypassword}) |
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185 | run ('scp foo myname@host.example.com:.', events={'(?i)password': mypassword}) | |
186 |
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186 | |||
187 | Examples |
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187 | Examples | |
188 | ======== |
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188 | ======== | |
189 |
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189 | |||
190 | Start the apache daemon on the local machine:: |
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190 | Start the apache daemon on the local machine:: | |
191 |
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191 | |||
192 | from pexpect import * |
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192 | from pexpect import * | |
193 | run ("/usr/local/apache/bin/apachectl start") |
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193 | run ("/usr/local/apache/bin/apachectl start") | |
194 |
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194 | |||
195 | Check in a file using SVN:: |
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195 | Check in a file using SVN:: | |
196 |
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196 | |||
197 | from pexpect import * |
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197 | from pexpect import * | |
198 | run ("svn ci -m 'automatic commit' my_file.py") |
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198 | run ("svn ci -m 'automatic commit' my_file.py") | |
199 |
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199 | |||
200 | Run a command and capture exit status:: |
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200 | Run a command and capture exit status:: | |
201 |
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201 | |||
202 | from pexpect import * |
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202 | from pexpect import * | |
203 | (command_output, exitstatus) = run ('ls -l /bin', withexitstatus=1) |
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203 | (command_output, exitstatus) = run ('ls -l /bin', withexitstatus=1) | |
204 |
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204 | |||
205 | Tricky Examples |
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205 | Tricky Examples | |
206 | =============== |
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206 | =============== | |
207 |
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207 | |||
208 | The following will run SSH and execute 'ls -l' on the remote machine. The |
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208 | The following will run SSH and execute 'ls -l' on the remote machine. The | |
209 | password 'secret' will be sent if the '(?i)password' pattern is ever seen:: |
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209 | password 'secret' will be sent if the '(?i)password' pattern is ever seen:: | |
210 |
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210 | |||
211 | run ("ssh username@machine.example.com 'ls -l'", events={'(?i)password':'secret\\n'}) |
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211 | run ("ssh username@machine.example.com 'ls -l'", events={'(?i)password':'secret\\n'}) | |
212 |
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212 | |||
213 | This will start mencoder to rip a video from DVD. This will also display |
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213 | This will start mencoder to rip a video from DVD. This will also display | |
214 | progress ticks every 5 seconds as it runs. For example:: |
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214 | progress ticks every 5 seconds as it runs. For example:: | |
215 |
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215 | |||
216 | from pexpect import * |
|
216 | from pexpect import * | |
217 | def print_ticks(d): |
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217 | def print_ticks(d): | |
218 | print d['event_count'], |
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218 | print d['event_count'], | |
219 | run ("mencoder dvd://1 -o video.avi -oac copy -ovc copy", events={TIMEOUT:print_ticks}, timeout=5) |
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219 | run ("mencoder dvd://1 -o video.avi -oac copy -ovc copy", events={TIMEOUT:print_ticks}, timeout=5) | |
220 |
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220 | |||
221 | The 'events' argument should be a dictionary of patterns and responses. |
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221 | The 'events' argument should be a dictionary of patterns and responses. | |
222 | Whenever one of the patterns is seen in the command out run() will send the |
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222 | Whenever one of the patterns is seen in the command out run() will send the | |
223 | associated response string. Note that you should put newlines in your |
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223 | associated response string. Note that you should put newlines in your | |
224 | string if Enter is necessary. The responses may also contain callback |
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224 | string if Enter is necessary. The responses may also contain callback | |
225 | functions. Any callback is function that takes a dictionary as an argument. |
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225 | functions. Any callback is function that takes a dictionary as an argument. | |
226 | The dictionary contains all the locals from the run() function, so you can |
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226 | The dictionary contains all the locals from the run() function, so you can | |
227 | access the child spawn object or any other variable defined in run() |
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227 | access the child spawn object or any other variable defined in run() | |
228 | (event_count, child, and extra_args are the most useful). A callback may |
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228 | (event_count, child, and extra_args are the most useful). A callback may | |
229 | return True to stop the current run process otherwise run() continues until |
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229 | return True to stop the current run process otherwise run() continues until | |
230 | the next event. A callback may also return a string which will be sent to |
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230 | the next event. A callback may also return a string which will be sent to | |
231 | the child. 'extra_args' is not used by directly run(). It provides a way to |
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231 | the child. 'extra_args' is not used by directly run(). It provides a way to | |
232 | pass data to a callback function through run() through the locals |
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232 | pass data to a callback function through run() through the locals | |
233 | dictionary passed to a callback.""" |
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233 | dictionary passed to a callback.""" | |
234 |
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234 | |||
235 | if timeout == -1: |
|
235 | if timeout == -1: | |
236 | child = spawn(command, maxread=2000, logfile=logfile, cwd=cwd, env=env, |
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236 | child = spawn(command, maxread=2000, logfile=logfile, cwd=cwd, env=env, | |
237 | encoding=encoding) |
|
237 | encoding=encoding) | |
238 | else: |
|
238 | else: | |
239 | child = spawn(command, timeout=timeout, maxread=2000, logfile=logfile, |
|
239 | child = spawn(command, timeout=timeout, maxread=2000, logfile=logfile, | |
240 | cwd=cwd, env=env, encoding=encoding) |
|
240 | cwd=cwd, env=env, encoding=encoding) | |
241 | if events is not None: |
|
241 | if events is not None: | |
242 | patterns = events.keys() |
|
242 | patterns = events.keys() | |
243 | responses = events.values() |
|
243 | responses = events.values() | |
244 | else: |
|
244 | else: | |
245 | patterns=None # We assume that EOF or TIMEOUT will save us. |
|
245 | patterns=None # We assume that EOF or TIMEOUT will save us. | |
246 | responses=None |
|
246 | responses=None | |
247 | child_result_list = [] |
|
247 | child_result_list = [] | |
248 | event_count = 0 |
|
248 | event_count = 0 | |
249 | while 1: |
|
249 | while 1: | |
250 | try: |
|
250 | try: | |
251 | index = child.expect (patterns) |
|
251 | index = child.expect (patterns) | |
252 | if isinstance(child.after, basestring): |
|
252 | if isinstance(child.after, basestring): | |
253 | child_result_list.append(child.before + child.after) |
|
253 | child_result_list.append(child.before + child.after) | |
254 | else: # child.after may have been a TIMEOUT or EOF, so don't cat those. |
|
254 | else: # child.after may have been a TIMEOUT or EOF, so don't cat those. | |
255 | child_result_list.append(child.before) |
|
255 | child_result_list.append(child.before) | |
256 | if isinstance(responses[index], basestring): |
|
256 | if isinstance(responses[index], basestring): | |
257 | child.send(responses[index]) |
|
257 | child.send(responses[index]) | |
258 | elif type(responses[index]) is types.FunctionType: |
|
258 | elif type(responses[index]) is types.FunctionType: | |
259 | callback_result = responses[index](locals()) |
|
259 | callback_result = responses[index](locals()) | |
260 | sys.stdout.flush() |
|
260 | sys.stdout.flush() | |
261 | if isinstance(callback_result, basestring): |
|
261 | if isinstance(callback_result, basestring): | |
262 | child.send(callback_result) |
|
262 | child.send(callback_result) | |
263 | elif callback_result: |
|
263 | elif callback_result: | |
264 | break |
|
264 | break | |
265 | else: |
|
265 | else: | |
266 | raise TypeError ('The callback must be a string or function type.') |
|
266 | raise TypeError ('The callback must be a string or function type.') | |
267 | event_count = event_count + 1 |
|
267 | event_count = event_count + 1 | |
268 | except TIMEOUT, e: |
|
268 | except TIMEOUT, e: | |
269 | child_result_list.append(child.before) |
|
269 | child_result_list.append(child.before) | |
270 | break |
|
270 | break | |
271 | except EOF, e: |
|
271 | except EOF, e: | |
272 | child_result_list.append(child.before) |
|
272 | child_result_list.append(child.before) | |
273 | break |
|
273 | break | |
274 | child_result = child._empty_buffer.join(child_result_list) |
|
274 | child_result = child._empty_buffer.join(child_result_list) | |
275 | if withexitstatus: |
|
275 | if withexitstatus: | |
276 | child.close() |
|
276 | child.close() | |
277 | return (child_result, child.exitstatus) |
|
277 | return (child_result, child.exitstatus) | |
278 | else: |
|
278 | else: | |
279 | return child_result |
|
279 | return child_result | |
280 |
|
280 | |||
281 | class spawnb(object): |
|
281 | class spawnb(object): | |
282 | """Use this class to start and control child applications with a pure-bytes |
|
282 | """Use this class to start and control child applications with a pure-bytes | |
283 | interface.""" |
|
283 | interface.""" | |
284 |
|
284 | |||
285 | _buffer_type = bytes |
|
285 | _buffer_type = bytes | |
286 | def _cast_buffer_type(self, s): |
|
286 | def _cast_buffer_type(self, s): | |
287 | return _cast_bytes(s, self.encoding) |
|
287 | return _cast_bytes(s, self.encoding) | |
288 | _empty_buffer = b'' |
|
288 | _empty_buffer = b'' | |
289 | _pty_newline = b'\r\n' |
|
289 | _pty_newline = b'\r\n' | |
290 |
|
290 | |||
291 | # Some code needs this to exist, but it's mainly for the spawn subclass. |
|
291 | # Some code needs this to exist, but it's mainly for the spawn subclass. | |
292 | encoding = 'utf-8' |
|
292 | encoding = 'utf-8' | |
293 |
|
293 | |||
294 | def __init__(self, command, args=[], timeout=30, maxread=2000, searchwindowsize=None, |
|
294 | def __init__(self, command, args=[], timeout=30, maxread=2000, searchwindowsize=None, | |
295 | logfile=None, cwd=None, env=None): |
|
295 | logfile=None, cwd=None, env=None): | |
296 |
|
296 | |||
297 | """This is the constructor. The command parameter may be a string that |
|
297 | """This is the constructor. The command parameter may be a string that | |
298 | includes a command and any arguments to the command. For example:: |
|
298 | includes a command and any arguments to the command. For example:: | |
299 |
|
299 | |||
300 | child = pexpect.spawn ('/usr/bin/ftp') |
|
300 | child = pexpect.spawn ('/usr/bin/ftp') | |
301 | child = pexpect.spawn ('/usr/bin/ssh user@example.com') |
|
301 | child = pexpect.spawn ('/usr/bin/ssh user@example.com') | |
302 | child = pexpect.spawn ('ls -latr /tmp') |
|
302 | child = pexpect.spawn ('ls -latr /tmp') | |
303 |
|
303 | |||
304 | You may also construct it with a list of arguments like so:: |
|
304 | You may also construct it with a list of arguments like so:: | |
305 |
|
305 | |||
306 | child = pexpect.spawn ('/usr/bin/ftp', []) |
|
306 | child = pexpect.spawn ('/usr/bin/ftp', []) | |
307 | child = pexpect.spawn ('/usr/bin/ssh', ['user@example.com']) |
|
307 | child = pexpect.spawn ('/usr/bin/ssh', ['user@example.com']) | |
308 | child = pexpect.spawn ('ls', ['-latr', '/tmp']) |
|
308 | child = pexpect.spawn ('ls', ['-latr', '/tmp']) | |
309 |
|
309 | |||
310 | After this the child application will be created and will be ready to |
|
310 | After this the child application will be created and will be ready to | |
311 | talk to. For normal use, see expect() and send() and sendline(). |
|
311 | talk to. For normal use, see expect() and send() and sendline(). | |
312 |
|
312 | |||
313 | Remember that Pexpect does NOT interpret shell meta characters such as |
|
313 | Remember that Pexpect does NOT interpret shell meta characters such as | |
314 | redirect, pipe, or wild cards (>, |, or *). This is a common mistake. |
|
314 | redirect, pipe, or wild cards (>, |, or *). This is a common mistake. | |
315 | If you want to run a command and pipe it through another command then |
|
315 | If you want to run a command and pipe it through another command then | |
316 | you must also start a shell. For example:: |
|
316 | you must also start a shell. For example:: | |
317 |
|
317 | |||
318 | child = pexpect.spawn('/bin/bash -c "ls -l | grep LOG > log_list.txt"') |
|
318 | child = pexpect.spawn('/bin/bash -c "ls -l | grep LOG > log_list.txt"') | |
319 | child.expect(pexpect.EOF) |
|
319 | child.expect(pexpect.EOF) | |
320 |
|
320 | |||
321 | The second form of spawn (where you pass a list of arguments) is useful |
|
321 | The second form of spawn (where you pass a list of arguments) is useful | |
322 | in situations where you wish to spawn a command and pass it its own |
|
322 | in situations where you wish to spawn a command and pass it its own | |
323 | argument list. This can make syntax more clear. For example, the |
|
323 | argument list. This can make syntax more clear. For example, the | |
324 | following is equivalent to the previous example:: |
|
324 | following is equivalent to the previous example:: | |
325 |
|
325 | |||
326 | shell_cmd = 'ls -l | grep LOG > log_list.txt' |
|
326 | shell_cmd = 'ls -l | grep LOG > log_list.txt' | |
327 | child = pexpect.spawn('/bin/bash', ['-c', shell_cmd]) |
|
327 | child = pexpect.spawn('/bin/bash', ['-c', shell_cmd]) | |
328 | child.expect(pexpect.EOF) |
|
328 | child.expect(pexpect.EOF) | |
329 |
|
329 | |||
330 | The maxread attribute sets the read buffer size. This is maximum number |
|
330 | The maxread attribute sets the read buffer size. This is maximum number | |
331 | of bytes that Pexpect will try to read from a TTY at one time. Setting |
|
331 | of bytes that Pexpect will try to read from a TTY at one time. Setting | |
332 | the maxread size to 1 will turn off buffering. Setting the maxread |
|
332 | the maxread size to 1 will turn off buffering. Setting the maxread | |
333 | value higher may help performance in cases where large amounts of |
|
333 | value higher may help performance in cases where large amounts of | |
334 | output are read back from the child. This feature is useful in |
|
334 | output are read back from the child. This feature is useful in | |
335 | conjunction with searchwindowsize. |
|
335 | conjunction with searchwindowsize. | |
336 |
|
336 | |||
337 | The searchwindowsize attribute sets the how far back in the incomming |
|
337 | The searchwindowsize attribute sets the how far back in the incomming | |
338 | seach buffer Pexpect will search for pattern matches. Every time |
|
338 | seach buffer Pexpect will search for pattern matches. Every time | |
339 | Pexpect reads some data from the child it will append the data to the |
|
339 | Pexpect reads some data from the child it will append the data to the | |
340 | incomming buffer. The default is to search from the beginning of the |
|
340 | incomming buffer. The default is to search from the beginning of the | |
341 | imcomming buffer each time new data is read from the child. But this is |
|
341 | imcomming buffer each time new data is read from the child. But this is | |
342 | very inefficient if you are running a command that generates a large |
|
342 | very inefficient if you are running a command that generates a large | |
343 | amount of data where you want to match The searchwindowsize does not |
|
343 | amount of data where you want to match The searchwindowsize does not | |
344 | effect the size of the incomming data buffer. You will still have |
|
344 | effect the size of the incomming data buffer. You will still have | |
345 | access to the full buffer after expect() returns. |
|
345 | access to the full buffer after expect() returns. | |
346 |
|
346 | |||
347 | The logfile member turns on or off logging. All input and output will |
|
347 | The logfile member turns on or off logging. All input and output will | |
348 | be copied to the given file object. Set logfile to None to stop |
|
348 | be copied to the given file object. Set logfile to None to stop | |
349 | logging. This is the default. Set logfile to sys.stdout to echo |
|
349 | logging. This is the default. Set logfile to sys.stdout to echo | |
350 | everything to standard output. The logfile is flushed after each write. |
|
350 | everything to standard output. The logfile is flushed after each write. | |
351 |
|
351 | |||
352 | Example log input and output to a file:: |
|
352 | Example log input and output to a file:: | |
353 |
|
353 | |||
354 | child = pexpect.spawn('some_command') |
|
354 | child = pexpect.spawn('some_command') | |
355 | fout = file('mylog.txt','w') |
|
355 | fout = file('mylog.txt','w') | |
356 | child.logfile = fout |
|
356 | child.logfile = fout | |
357 |
|
357 | |||
358 | Example log to stdout:: |
|
358 | Example log to stdout:: | |
359 |
|
359 | |||
360 | child = pexpect.spawn('some_command') |
|
360 | child = pexpect.spawn('some_command') | |
361 | child.logfile = sys.stdout |
|
361 | child.logfile = sys.stdout | |
362 |
|
362 | |||
363 | The logfile_read and logfile_send members can be used to separately log |
|
363 | The logfile_read and logfile_send members can be used to separately log | |
364 | the input from the child and output sent to the child. Sometimes you |
|
364 | the input from the child and output sent to the child. Sometimes you | |
365 | don't want to see everything you write to the child. You only want to |
|
365 | don't want to see everything you write to the child. You only want to | |
366 | log what the child sends back. For example:: |
|
366 | log what the child sends back. For example:: | |
367 |
|
367 | |||
368 | child = pexpect.spawn('some_command') |
|
368 | child = pexpect.spawn('some_command') | |
369 | child.logfile_read = sys.stdout |
|
369 | child.logfile_read = sys.stdout | |
370 |
|
370 | |||
371 | To separately log output sent to the child use logfile_send:: |
|
371 | To separately log output sent to the child use logfile_send:: | |
372 |
|
372 | |||
373 | self.logfile_send = fout |
|
373 | self.logfile_send = fout | |
374 |
|
374 | |||
375 | The delaybeforesend helps overcome a weird behavior that many users |
|
375 | The delaybeforesend helps overcome a weird behavior that many users | |
376 | were experiencing. The typical problem was that a user would expect() a |
|
376 | were experiencing. The typical problem was that a user would expect() a | |
377 | "Password:" prompt and then immediately call sendline() to send the |
|
377 | "Password:" prompt and then immediately call sendline() to send the | |
378 | password. The user would then see that their password was echoed back |
|
378 | password. The user would then see that their password was echoed back | |
379 | to them. Passwords don't normally echo. The problem is caused by the |
|
379 | to them. Passwords don't normally echo. The problem is caused by the | |
380 | fact that most applications print out the "Password" prompt and then |
|
380 | fact that most applications print out the "Password" prompt and then | |
381 | turn off stdin echo, but if you send your password before the |
|
381 | turn off stdin echo, but if you send your password before the | |
382 | application turned off echo, then you get your password echoed. |
|
382 | application turned off echo, then you get your password echoed. | |
383 | Normally this wouldn't be a problem when interacting with a human at a |
|
383 | Normally this wouldn't be a problem when interacting with a human at a | |
384 | real keyboard. If you introduce a slight delay just before writing then |
|
384 | real keyboard. If you introduce a slight delay just before writing then | |
385 | this seems to clear up the problem. This was such a common problem for |
|
385 | this seems to clear up the problem. This was such a common problem for | |
386 | many users that I decided that the default pexpect behavior should be |
|
386 | many users that I decided that the default pexpect behavior should be | |
387 | to sleep just before writing to the child application. 1/20th of a |
|
387 | to sleep just before writing to the child application. 1/20th of a | |
388 | second (50 ms) seems to be enough to clear up the problem. You can set |
|
388 | second (50 ms) seems to be enough to clear up the problem. You can set | |
389 | delaybeforesend to 0 to return to the old behavior. Most Linux machines |
|
389 | delaybeforesend to 0 to return to the old behavior. Most Linux machines | |
390 | don't like this to be below 0.03. I don't know why. |
|
390 | don't like this to be below 0.03. I don't know why. | |
391 |
|
391 | |||
392 | Note that spawn is clever about finding commands on your path. |
|
392 | Note that spawn is clever about finding commands on your path. | |
393 | It uses the same logic that "which" uses to find executables. |
|
393 | It uses the same logic that "which" uses to find executables. | |
394 |
|
394 | |||
395 | If you wish to get the exit status of the child you must call the |
|
395 | If you wish to get the exit status of the child you must call the | |
396 | close() method. The exit or signal status of the child will be stored |
|
396 | close() method. The exit or signal status of the child will be stored | |
397 | in self.exitstatus or self.signalstatus. If the child exited normally |
|
397 | in self.exitstatus or self.signalstatus. If the child exited normally | |
398 | then exitstatus will store the exit return code and signalstatus will |
|
398 | then exitstatus will store the exit return code and signalstatus will | |
399 | be None. If the child was terminated abnormally with a signal then |
|
399 | be None. If the child was terminated abnormally with a signal then | |
400 | signalstatus will store the signal value and exitstatus will be None. |
|
400 | signalstatus will store the signal value and exitstatus will be None. | |
401 | If you need more detail you can also read the self.status member which |
|
401 | If you need more detail you can also read the self.status member which | |
402 | stores the status returned by os.waitpid. You can interpret this using |
|
402 | stores the status returned by os.waitpid. You can interpret this using | |
403 | os.WIFEXITED/os.WEXITSTATUS or os.WIFSIGNALED/os.TERMSIG. """ |
|
403 | os.WIFEXITED/os.WEXITSTATUS or os.WIFSIGNALED/os.TERMSIG. """ | |
404 |
|
404 | |||
405 | self.STDIN_FILENO = pty.STDIN_FILENO |
|
405 | self.STDIN_FILENO = pty.STDIN_FILENO | |
406 | self.STDOUT_FILENO = pty.STDOUT_FILENO |
|
406 | self.STDOUT_FILENO = pty.STDOUT_FILENO | |
407 | self.STDERR_FILENO = pty.STDERR_FILENO |
|
407 | self.STDERR_FILENO = pty.STDERR_FILENO | |
408 | self.stdin = sys.stdin |
|
408 | self.stdin = sys.stdin | |
409 | self.stdout = sys.stdout |
|
409 | self.stdout = sys.stdout | |
410 | self.stderr = sys.stderr |
|
410 | self.stderr = sys.stderr | |
411 |
|
411 | |||
412 | self.searcher = None |
|
412 | self.searcher = None | |
413 | self.ignorecase = False |
|
413 | self.ignorecase = False | |
414 | self.before = None |
|
414 | self.before = None | |
415 | self.after = None |
|
415 | self.after = None | |
416 | self.match = None |
|
416 | self.match = None | |
417 | self.match_index = None |
|
417 | self.match_index = None | |
418 | self.terminated = True |
|
418 | self.terminated = True | |
419 | self.exitstatus = None |
|
419 | self.exitstatus = None | |
420 | self.signalstatus = None |
|
420 | self.signalstatus = None | |
421 | self.status = None # status returned by os.waitpid |
|
421 | self.status = None # status returned by os.waitpid | |
422 | self.flag_eof = False |
|
422 | self.flag_eof = False | |
423 | self.pid = None |
|
423 | self.pid = None | |
424 | self.child_fd = -1 # initially closed |
|
424 | self.child_fd = -1 # initially closed | |
425 | self.timeout = timeout |
|
425 | self.timeout = timeout | |
426 | self.delimiter = EOF |
|
426 | self.delimiter = EOF | |
427 | self.logfile = logfile |
|
427 | self.logfile = logfile | |
428 | self.logfile_read = None # input from child (read_nonblocking) |
|
428 | self.logfile_read = None # input from child (read_nonblocking) | |
429 | self.logfile_send = None # output to send (send, sendline) |
|
429 | self.logfile_send = None # output to send (send, sendline) | |
430 | self.maxread = maxread # max bytes to read at one time into buffer |
|
430 | self.maxread = maxread # max bytes to read at one time into buffer | |
431 | self.buffer = self._empty_buffer # This is the read buffer. See maxread. |
|
431 | self.buffer = self._empty_buffer # This is the read buffer. See maxread. | |
432 | self.searchwindowsize = searchwindowsize # Anything before searchwindowsize point is preserved, but not searched. |
|
432 | self.searchwindowsize = searchwindowsize # Anything before searchwindowsize point is preserved, but not searched. | |
433 | # Most Linux machines don't like delaybeforesend to be below 0.03 (30 ms). |
|
433 | # Most Linux machines don't like delaybeforesend to be below 0.03 (30 ms). | |
434 | self.delaybeforesend = 0.05 # Sets sleep time used just before sending data to child. Time in seconds. |
|
434 | self.delaybeforesend = 0.05 # Sets sleep time used just before sending data to child. Time in seconds. | |
435 | self.delayafterclose = 0.1 # Sets delay in close() method to allow kernel time to update process status. Time in seconds. |
|
435 | self.delayafterclose = 0.1 # Sets delay in close() method to allow kernel time to update process status. Time in seconds. | |
436 | self.delayafterterminate = 0.1 # Sets delay in terminate() method to allow kernel time to update process status. Time in seconds. |
|
436 | self.delayafterterminate = 0.1 # Sets delay in terminate() method to allow kernel time to update process status. Time in seconds. | |
437 | self.softspace = False # File-like object. |
|
437 | self.softspace = False # File-like object. | |
438 | self.name = '<' + repr(self) + '>' # File-like object. |
|
438 | self.name = '<' + repr(self) + '>' # File-like object. | |
439 | self.closed = True # File-like object. |
|
439 | self.closed = True # File-like object. | |
440 | self.cwd = cwd |
|
440 | self.cwd = cwd | |
441 | self.env = env |
|
441 | self.env = env | |
442 | self.__irix_hack = (sys.platform.lower().find('irix')>=0) # This flags if we are running on irix |
|
442 | self.__irix_hack = (sys.platform.lower().find('irix')>=0) # This flags if we are running on irix | |
443 | # Solaris uses internal __fork_pty(). All others use pty.fork(). |
|
443 | # Solaris uses internal __fork_pty(). All others use pty.fork(). | |
444 | if 'solaris' in sys.platform.lower() or 'sunos5' in sys.platform.lower(): |
|
444 | if 'solaris' in sys.platform.lower() or 'sunos5' in sys.platform.lower(): | |
445 | self.use_native_pty_fork = False |
|
445 | self.use_native_pty_fork = False | |
446 | else: |
|
446 | else: | |
447 | self.use_native_pty_fork = True |
|
447 | self.use_native_pty_fork = True | |
448 |
|
448 | |||
449 |
|
449 | |||
450 | # allow dummy instances for subclasses that may not use command or args. |
|
450 | # allow dummy instances for subclasses that may not use command or args. | |
451 | if command is None: |
|
451 | if command is None: | |
452 | self.command = None |
|
452 | self.command = None | |
453 | self.args = None |
|
453 | self.args = None | |
454 | self.name = '<pexpect factory incomplete>' |
|
454 | self.name = '<pexpect factory incomplete>' | |
455 | else: |
|
455 | else: | |
456 | self._spawn (command, args) |
|
456 | self._spawn (command, args) | |
457 |
|
457 | |||
458 | def __del__(self): |
|
458 | def __del__(self): | |
459 |
|
459 | |||
460 | """This makes sure that no system resources are left open. Python only |
|
460 | """This makes sure that no system resources are left open. Python only | |
461 | garbage collects Python objects. OS file descriptors are not Python |
|
461 | garbage collects Python objects. OS file descriptors are not Python | |
462 | objects, so they must be handled explicitly. If the child file |
|
462 | objects, so they must be handled explicitly. If the child file | |
463 | descriptor was opened outside of this class (passed to the constructor) |
|
463 | descriptor was opened outside of this class (passed to the constructor) | |
464 | then this does not close it. """ |
|
464 | then this does not close it. """ | |
465 |
|
465 | |||
466 | if not self.closed: |
|
466 | if not self.closed: | |
467 | # It is possible for __del__ methods to execute during the |
|
467 | # It is possible for __del__ methods to execute during the | |
468 | # teardown of the Python VM itself. Thus self.close() may |
|
468 | # teardown of the Python VM itself. Thus self.close() may | |
469 | # trigger an exception because os.close may be None. |
|
469 | # trigger an exception because os.close may be None. | |
470 | # -- Fernando Perez |
|
470 | # -- Fernando Perez | |
471 | try: |
|
471 | try: | |
472 | self.close() |
|
472 | self.close() | |
473 | except: |
|
473 | except: | |
474 | pass |
|
474 | pass | |
475 |
|
475 | |||
476 | def __str__(self): |
|
476 | def __str__(self): | |
477 |
|
477 | |||
478 | """This returns a human-readable string that represents the state of |
|
478 | """This returns a human-readable string that represents the state of | |
479 | the object. """ |
|
479 | the object. """ | |
480 |
|
480 | |||
481 | s = [] |
|
481 | s = [] | |
482 | s.append(repr(self)) |
|
482 | s.append(repr(self)) | |
483 | s.append('version: ' + __version__) |
|
483 | s.append('version: ' + __version__) | |
484 | s.append('command: ' + str(self.command)) |
|
484 | s.append('command: ' + str(self.command)) | |
485 | s.append('args: ' + str(self.args)) |
|
485 | s.append('args: ' + str(self.args)) | |
486 | s.append('searcher: ' + str(self.searcher)) |
|
486 | s.append('searcher: ' + str(self.searcher)) | |
487 | s.append('buffer (last 100 chars): ' + str(self.buffer)[-100:]) |
|
487 | s.append('buffer (last 100 chars): ' + str(self.buffer)[-100:]) | |
488 | s.append('before (last 100 chars): ' + str(self.before)[-100:]) |
|
488 | s.append('before (last 100 chars): ' + str(self.before)[-100:]) | |
489 | s.append('after: ' + str(self.after)) |
|
489 | s.append('after: ' + str(self.after)) | |
490 | s.append('match: ' + str(self.match)) |
|
490 | s.append('match: ' + str(self.match)) | |
491 | s.append('match_index: ' + str(self.match_index)) |
|
491 | s.append('match_index: ' + str(self.match_index)) | |
492 | s.append('exitstatus: ' + str(self.exitstatus)) |
|
492 | s.append('exitstatus: ' + str(self.exitstatus)) | |
493 | s.append('flag_eof: ' + str(self.flag_eof)) |
|
493 | s.append('flag_eof: ' + str(self.flag_eof)) | |
494 | s.append('pid: ' + str(self.pid)) |
|
494 | s.append('pid: ' + str(self.pid)) | |
495 | s.append('child_fd: ' + str(self.child_fd)) |
|
495 | s.append('child_fd: ' + str(self.child_fd)) | |
496 | s.append('closed: ' + str(self.closed)) |
|
496 | s.append('closed: ' + str(self.closed)) | |
497 | s.append('timeout: ' + str(self.timeout)) |
|
497 | s.append('timeout: ' + str(self.timeout)) | |
498 | s.append('delimiter: ' + str(self.delimiter)) |
|
498 | s.append('delimiter: ' + str(self.delimiter)) | |
499 | s.append('logfile: ' + str(self.logfile)) |
|
499 | s.append('logfile: ' + str(self.logfile)) | |
500 | s.append('logfile_read: ' + str(self.logfile_read)) |
|
500 | s.append('logfile_read: ' + str(self.logfile_read)) | |
501 | s.append('logfile_send: ' + str(self.logfile_send)) |
|
501 | s.append('logfile_send: ' + str(self.logfile_send)) | |
502 | s.append('maxread: ' + str(self.maxread)) |
|
502 | s.append('maxread: ' + str(self.maxread)) | |
503 | s.append('ignorecase: ' + str(self.ignorecase)) |
|
503 | s.append('ignorecase: ' + str(self.ignorecase)) | |
504 | s.append('searchwindowsize: ' + str(self.searchwindowsize)) |
|
504 | s.append('searchwindowsize: ' + str(self.searchwindowsize)) | |
505 | s.append('delaybeforesend: ' + str(self.delaybeforesend)) |
|
505 | s.append('delaybeforesend: ' + str(self.delaybeforesend)) | |
506 | s.append('delayafterclose: ' + str(self.delayafterclose)) |
|
506 | s.append('delayafterclose: ' + str(self.delayafterclose)) | |
507 | s.append('delayafterterminate: ' + str(self.delayafterterminate)) |
|
507 | s.append('delayafterterminate: ' + str(self.delayafterterminate)) | |
508 | return '\n'.join(s) |
|
508 | return '\n'.join(s) | |
509 |
|
509 | |||
510 | def _spawn(self,command,args=[]): |
|
510 | def _spawn(self,command,args=[]): | |
511 |
|
511 | |||
512 | """This starts the given command in a child process. This does all the |
|
512 | """This starts the given command in a child process. This does all the | |
513 | fork/exec type of stuff for a pty. This is called by __init__. If args |
|
513 | fork/exec type of stuff for a pty. This is called by __init__. If args | |
514 | is empty then command will be parsed (split on spaces) and args will be |
|
514 | is empty then command will be parsed (split on spaces) and args will be | |
515 | set to parsed arguments. """ |
|
515 | set to parsed arguments. """ | |
516 |
|
516 | |||
517 | # The pid and child_fd of this object get set by this method. |
|
517 | # The pid and child_fd of this object get set by this method. | |
518 | # Note that it is difficult for this method to fail. |
|
518 | # Note that it is difficult for this method to fail. | |
519 | # You cannot detect if the child process cannot start. |
|
519 | # You cannot detect if the child process cannot start. | |
520 | # So the only way you can tell if the child process started |
|
520 | # So the only way you can tell if the child process started | |
521 | # or not is to try to read from the file descriptor. If you get |
|
521 | # or not is to try to read from the file descriptor. If you get | |
522 | # EOF immediately then it means that the child is already dead. |
|
522 | # EOF immediately then it means that the child is already dead. | |
523 | # That may not necessarily be bad because you may haved spawned a child |
|
523 | # That may not necessarily be bad because you may haved spawned a child | |
524 | # that performs some task; creates no stdout output; and then dies. |
|
524 | # that performs some task; creates no stdout output; and then dies. | |
525 |
|
525 | |||
526 | # If command is an int type then it may represent a file descriptor. |
|
526 | # If command is an int type then it may represent a file descriptor. | |
527 | if type(command) == type(0): |
|
527 | if type(command) == type(0): | |
528 | raise ExceptionPexpect ('Command is an int type. If this is a file descriptor then maybe you want to use fdpexpect.fdspawn which takes an existing file descriptor instead of a command string.') |
|
528 | raise ExceptionPexpect ('Command is an int type. If this is a file descriptor then maybe you want to use fdpexpect.fdspawn which takes an existing file descriptor instead of a command string.') | |
529 |
|
529 | |||
530 | if type (args) != type([]): |
|
530 | if type (args) != type([]): | |
531 | raise TypeError ('The argument, args, must be a list.') |
|
531 | raise TypeError ('The argument, args, must be a list.') | |
532 |
|
532 | |||
533 | if args == []: |
|
533 | if args == []: | |
534 | self.args = split_command_line(command) |
|
534 | self.args = split_command_line(command) | |
535 | self.command = self.args[0] |
|
535 | self.command = self.args[0] | |
536 | else: |
|
536 | else: | |
537 | self.args = args[:] # work with a copy |
|
537 | self.args = args[:] # work with a copy | |
538 | self.args.insert (0, command) |
|
538 | self.args.insert (0, command) | |
539 | self.command = command |
|
539 | self.command = command | |
540 |
|
540 | |||
541 | command_with_path = which(self.command) |
|
541 | command_with_path = which(self.command) | |
542 | if command_with_path is None: |
|
542 | if command_with_path is None: | |
543 | raise ExceptionPexpect ('The command was not found or was not executable: %s.' % self.command) |
|
543 | raise ExceptionPexpect ('The command was not found or was not executable: %s.' % self.command) | |
544 | self.command = command_with_path |
|
544 | self.command = command_with_path | |
545 | self.args[0] = self.command |
|
545 | self.args[0] = self.command | |
546 |
|
546 | |||
547 | self.name = '<' + ' '.join (self.args) + '>' |
|
547 | self.name = '<' + ' '.join (self.args) + '>' | |
548 |
|
548 | |||
549 | assert self.pid is None, 'The pid member should be None.' |
|
549 | assert self.pid is None, 'The pid member should be None.' | |
550 | assert self.command is not None, 'The command member should not be None.' |
|
550 | assert self.command is not None, 'The command member should not be None.' | |
551 |
|
551 | |||
552 | if self.use_native_pty_fork: |
|
552 | if self.use_native_pty_fork: | |
553 | try: |
|
553 | try: | |
554 | self.pid, self.child_fd = pty.fork() |
|
554 | self.pid, self.child_fd = pty.fork() | |
555 | except OSError, e: |
|
555 | except OSError, e: | |
556 | raise ExceptionPexpect('Error! pty.fork() failed: ' + str(e)) |
|
556 | raise ExceptionPexpect('Error! pty.fork() failed: ' + str(e)) | |
557 | else: # Use internal __fork_pty |
|
557 | else: # Use internal __fork_pty | |
558 | self.pid, self.child_fd = self.__fork_pty() |
|
558 | self.pid, self.child_fd = self.__fork_pty() | |
559 |
|
559 | |||
560 | if self.pid == 0: # Child |
|
560 | if self.pid == 0: # Child | |
561 | try: |
|
561 | try: | |
562 | self.child_fd = sys.stdout.fileno() # used by setwinsize() |
|
562 | self.child_fd = sys.stdout.fileno() # used by setwinsize() | |
563 | self.setwinsize(24, 80) |
|
563 | self.setwinsize(24, 80) | |
564 | except: |
|
564 | except: | |
565 | # Some platforms do not like setwinsize (Cygwin). |
|
565 | # Some platforms do not like setwinsize (Cygwin). | |
566 | # This will cause problem when running applications that |
|
566 | # This will cause problem when running applications that | |
567 | # are very picky about window size. |
|
567 | # are very picky about window size. | |
568 | # This is a serious limitation, but not a show stopper. |
|
568 | # This is a serious limitation, but not a show stopper. | |
569 | pass |
|
569 | pass | |
570 | # Do not allow child to inherit open file descriptors from parent. |
|
570 | # Do not allow child to inherit open file descriptors from parent. | |
571 | max_fd = resource.getrlimit(resource.RLIMIT_NOFILE)[0] |
|
571 | max_fd = resource.getrlimit(resource.RLIMIT_NOFILE)[0] | |
572 | for i in range (3, max_fd): |
|
572 | for i in range (3, max_fd): | |
573 | try: |
|
573 | try: | |
574 | os.close (i) |
|
574 | os.close (i) | |
575 | except OSError: |
|
575 | except OSError: | |
576 | pass |
|
576 | pass | |
577 |
|
577 | |||
578 | # I don't know why this works, but ignoring SIGHUP fixes a |
|
578 | # I don't know why this works, but ignoring SIGHUP fixes a | |
579 | # problem when trying to start a Java daemon with sudo |
|
579 | # problem when trying to start a Java daemon with sudo | |
580 | # (specifically, Tomcat). |
|
580 | # (specifically, Tomcat). | |
581 | signal.signal(signal.SIGHUP, signal.SIG_IGN) |
|
581 | signal.signal(signal.SIGHUP, signal.SIG_IGN) | |
582 |
|
582 | |||
583 | if self.cwd is not None: |
|
583 | if self.cwd is not None: | |
584 | os.chdir(self.cwd) |
|
584 | os.chdir(self.cwd) | |
585 | if self.env is None: |
|
585 | if self.env is None: | |
586 | os.execv(self.command, self.args) |
|
586 | os.execv(self.command, self.args) | |
587 | else: |
|
587 | else: | |
588 | os.execvpe(self.command, self.args, self.env) |
|
588 | os.execvpe(self.command, self.args, self.env) | |
589 |
|
589 | |||
590 | # Parent |
|
590 | # Parent | |
591 | self.terminated = False |
|
591 | self.terminated = False | |
592 | self.closed = False |
|
592 | self.closed = False | |
593 |
|
593 | |||
594 | def __fork_pty(self): |
|
594 | def __fork_pty(self): | |
595 |
|
595 | |||
596 | """This implements a substitute for the forkpty system call. This |
|
596 | """This implements a substitute for the forkpty system call. This | |
597 | should be more portable than the pty.fork() function. Specifically, |
|
597 | should be more portable than the pty.fork() function. Specifically, | |
598 | this should work on Solaris. |
|
598 | this should work on Solaris. | |
599 |
|
599 | |||
600 | Modified 10.06.05 by Geoff Marshall: Implemented __fork_pty() method to |
|
600 | Modified 10.06.05 by Geoff Marshall: Implemented __fork_pty() method to | |
601 | resolve the issue with Python's pty.fork() not supporting Solaris, |
|
601 | resolve the issue with Python's pty.fork() not supporting Solaris, | |
602 | particularly ssh. Based on patch to posixmodule.c authored by Noah |
|
602 | particularly ssh. Based on patch to posixmodule.c authored by Noah | |
603 | Spurrier:: |
|
603 | Spurrier:: | |
604 |
|
604 | |||
605 | http://mail.python.org/pipermail/python-dev/2003-May/035281.html |
|
605 | http://mail.python.org/pipermail/python-dev/2003-May/035281.html | |
606 |
|
606 | |||
607 | """ |
|
607 | """ | |
608 |
|
608 | |||
609 | parent_fd, child_fd = os.openpty() |
|
609 | parent_fd, child_fd = os.openpty() | |
610 | if parent_fd < 0 or child_fd < 0: |
|
610 | if parent_fd < 0 or child_fd < 0: | |
611 | raise ExceptionPexpect, "Error! Could not open pty with os.openpty()." |
|
611 | raise ExceptionPexpect, "Error! Could not open pty with os.openpty()." | |
612 |
|
612 | |||
613 | pid = os.fork() |
|
613 | pid = os.fork() | |
614 | if pid < 0: |
|
614 | if pid < 0: | |
615 | raise ExceptionPexpect, "Error! Failed os.fork()." |
|
615 | raise ExceptionPexpect, "Error! Failed os.fork()." | |
616 | elif pid == 0: |
|
616 | elif pid == 0: | |
617 | # Child. |
|
617 | # Child. | |
618 | os.close(parent_fd) |
|
618 | os.close(parent_fd) | |
619 | self.__pty_make_controlling_tty(child_fd) |
|
619 | self.__pty_make_controlling_tty(child_fd) | |
620 |
|
620 | |||
621 | os.dup2(child_fd, 0) |
|
621 | os.dup2(child_fd, 0) | |
622 | os.dup2(child_fd, 1) |
|
622 | os.dup2(child_fd, 1) | |
623 | os.dup2(child_fd, 2) |
|
623 | os.dup2(child_fd, 2) | |
624 |
|
624 | |||
625 | if child_fd > 2: |
|
625 | if child_fd > 2: | |
626 | os.close(child_fd) |
|
626 | os.close(child_fd) | |
627 | else: |
|
627 | else: | |
628 | # Parent. |
|
628 | # Parent. | |
629 | os.close(child_fd) |
|
629 | os.close(child_fd) | |
630 |
|
630 | |||
631 | return pid, parent_fd |
|
631 | return pid, parent_fd | |
632 |
|
632 | |||
633 | def __pty_make_controlling_tty(self, tty_fd): |
|
633 | def __pty_make_controlling_tty(self, tty_fd): | |
634 |
|
634 | |||
635 | """This makes the pseudo-terminal the controlling tty. This should be |
|
635 | """This makes the pseudo-terminal the controlling tty. This should be | |
636 | more portable than the pty.fork() function. Specifically, this should |
|
636 | more portable than the pty.fork() function. Specifically, this should | |
637 | work on Solaris. """ |
|
637 | work on Solaris. """ | |
638 |
|
638 | |||
639 | child_name = os.ttyname(tty_fd) |
|
639 | child_name = os.ttyname(tty_fd) | |
640 |
|
640 | |||
641 | # Disconnect from controlling tty. Harmless if not already connected. |
|
641 | # Disconnect from controlling tty. Harmless if not already connected. | |
642 | try: |
|
642 | try: | |
643 | fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY); |
|
643 | fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY); | |
644 | if fd >= 0: |
|
644 | if fd >= 0: | |
645 | os.close(fd) |
|
645 | os.close(fd) | |
646 | except: |
|
646 | except: | |
647 | # Already disconnected. This happens if running inside cron. |
|
647 | # Already disconnected. This happens if running inside cron. | |
648 | pass |
|
648 | pass | |
649 |
|
649 | |||
650 | os.setsid() |
|
650 | os.setsid() | |
651 |
|
651 | |||
652 | # Verify we are disconnected from controlling tty |
|
652 | # Verify we are disconnected from controlling tty | |
653 | # by attempting to open it again. |
|
653 | # by attempting to open it again. | |
654 | try: |
|
654 | try: | |
655 | fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY); |
|
655 | fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY); | |
656 | if fd >= 0: |
|
656 | if fd >= 0: | |
657 | os.close(fd) |
|
657 | os.close(fd) | |
658 | raise ExceptionPexpect, "Error! Failed to disconnect from controlling tty. It is still possible to open /dev/tty." |
|
658 | raise ExceptionPexpect, "Error! Failed to disconnect from controlling tty. It is still possible to open /dev/tty." | |
659 | except: |
|
659 | except: | |
660 | # Good! We are disconnected from a controlling tty. |
|
660 | # Good! We are disconnected from a controlling tty. | |
661 | pass |
|
661 | pass | |
662 |
|
662 | |||
663 | # Verify we can open child pty. |
|
663 | # Verify we can open child pty. | |
664 | fd = os.open(child_name, os.O_RDWR); |
|
664 | fd = os.open(child_name, os.O_RDWR); | |
665 | if fd < 0: |
|
665 | if fd < 0: | |
666 | raise ExceptionPexpect, "Error! Could not open child pty, " + child_name |
|
666 | raise ExceptionPexpect, "Error! Could not open child pty, " + child_name | |
667 | else: |
|
667 | else: | |
668 | os.close(fd) |
|
668 | os.close(fd) | |
669 |
|
669 | |||
670 | # Verify we now have a controlling tty. |
|
670 | # Verify we now have a controlling tty. | |
671 | fd = os.open("/dev/tty", os.O_WRONLY) |
|
671 | fd = os.open("/dev/tty", os.O_WRONLY) | |
672 | if fd < 0: |
|
672 | if fd < 0: | |
673 | raise ExceptionPexpect, "Error! Could not open controlling tty, /dev/tty" |
|
673 | raise ExceptionPexpect, "Error! Could not open controlling tty, /dev/tty" | |
674 | else: |
|
674 | else: | |
675 | os.close(fd) |
|
675 | os.close(fd) | |
676 |
|
676 | |||
677 | def fileno (self): # File-like object. |
|
677 | def fileno (self): # File-like object. | |
678 |
|
678 | |||
679 | """This returns the file descriptor of the pty for the child. |
|
679 | """This returns the file descriptor of the pty for the child. | |
680 | """ |
|
680 | """ | |
681 |
|
681 | |||
682 | return self.child_fd |
|
682 | return self.child_fd | |
683 |
|
683 | |||
684 | def close (self, force=True): # File-like object. |
|
684 | def close (self, force=True): # File-like object. | |
685 |
|
685 | |||
686 | """This closes the connection with the child application. Note that |
|
686 | """This closes the connection with the child application. Note that | |
687 | calling close() more than once is valid. This emulates standard Python |
|
687 | calling close() more than once is valid. This emulates standard Python | |
688 | behavior with files. Set force to True if you want to make sure that |
|
688 | behavior with files. Set force to True if you want to make sure that | |
689 | the child is terminated (SIGKILL is sent if the child ignores SIGHUP |
|
689 | the child is terminated (SIGKILL is sent if the child ignores SIGHUP | |
690 | and SIGINT). """ |
|
690 | and SIGINT). """ | |
691 |
|
691 | |||
692 | if not self.closed: |
|
692 | if not self.closed: | |
693 | self.flush() |
|
693 | self.flush() | |
694 | os.close (self.child_fd) |
|
694 | os.close (self.child_fd) | |
695 | time.sleep(self.delayafterclose) # Give kernel time to update process status. |
|
695 | time.sleep(self.delayafterclose) # Give kernel time to update process status. | |
696 | if self.isalive(): |
|
696 | if self.isalive(): | |
697 | if not self.terminate(force): |
|
697 | if not self.terminate(force): | |
698 | raise ExceptionPexpect ('close() could not terminate the child using terminate()') |
|
698 | raise ExceptionPexpect ('close() could not terminate the child using terminate()') | |
699 | self.child_fd = -1 |
|
699 | self.child_fd = -1 | |
700 | self.closed = True |
|
700 | self.closed = True | |
701 | #self.pid = None |
|
701 | #self.pid = None | |
702 |
|
702 | |||
703 | def flush (self): # File-like object. |
|
703 | def flush (self): # File-like object. | |
704 |
|
704 | |||
705 | """This does nothing. It is here to support the interface for a |
|
705 | """This does nothing. It is here to support the interface for a | |
706 | File-like object. """ |
|
706 | File-like object. """ | |
707 |
|
707 | |||
708 | pass |
|
708 | pass | |
709 |
|
709 | |||
710 | def isatty (self): # File-like object. |
|
710 | def isatty (self): # File-like object. | |
711 |
|
711 | |||
712 | """This returns True if the file descriptor is open and connected to a |
|
712 | """This returns True if the file descriptor is open and connected to a | |
713 | tty(-like) device, else False. """ |
|
713 | tty(-like) device, else False. """ | |
714 |
|
714 | |||
715 | return os.isatty(self.child_fd) |
|
715 | return os.isatty(self.child_fd) | |
716 |
|
716 | |||
717 | def waitnoecho (self, timeout=-1): |
|
717 | def waitnoecho (self, timeout=-1): | |
718 |
|
718 | |||
719 | """This waits until the terminal ECHO flag is set False. This returns |
|
719 | """This waits until the terminal ECHO flag is set False. This returns | |
720 | True if the echo mode is off. This returns False if the ECHO flag was |
|
720 | True if the echo mode is off. This returns False if the ECHO flag was | |
721 | not set False before the timeout. This can be used to detect when the |
|
721 | not set False before the timeout. This can be used to detect when the | |
722 | child is waiting for a password. Usually a child application will turn |
|
722 | child is waiting for a password. Usually a child application will turn | |
723 | off echo mode when it is waiting for the user to enter a password. For |
|
723 | off echo mode when it is waiting for the user to enter a password. For | |
724 | example, instead of expecting the "password:" prompt you can wait for |
|
724 | example, instead of expecting the "password:" prompt you can wait for | |
725 | the child to set ECHO off:: |
|
725 | the child to set ECHO off:: | |
726 |
|
726 | |||
727 | p = pexpect.spawn ('ssh user@example.com') |
|
727 | p = pexpect.spawn ('ssh user@example.com') | |
728 | p.waitnoecho() |
|
728 | p.waitnoecho() | |
729 | p.sendline(mypassword) |
|
729 | p.sendline(mypassword) | |
730 |
|
730 | |||
731 | If timeout==-1 then this method will use the value in self.timeout. |
|
731 | If timeout==-1 then this method will use the value in self.timeout. | |
732 | If timeout==None then this method to block until ECHO flag is False. |
|
732 | If timeout==None then this method to block until ECHO flag is False. | |
733 | """ |
|
733 | """ | |
734 |
|
734 | |||
735 | if timeout == -1: |
|
735 | if timeout == -1: | |
736 | timeout = self.timeout |
|
736 | timeout = self.timeout | |
737 | if timeout is not None: |
|
737 | if timeout is not None: | |
738 | end_time = time.time() + timeout |
|
738 | end_time = time.time() + timeout | |
739 | while True: |
|
739 | while True: | |
740 | if not self.getecho(): |
|
740 | if not self.getecho(): | |
741 | return True |
|
741 | return True | |
742 | if timeout < 0 and timeout is not None: |
|
742 | if timeout < 0 and timeout is not None: | |
743 | return False |
|
743 | return False | |
744 | if timeout is not None: |
|
744 | if timeout is not None: | |
745 | timeout = end_time - time.time() |
|
745 | timeout = end_time - time.time() | |
746 | time.sleep(0.1) |
|
746 | time.sleep(0.1) | |
747 |
|
747 | |||
748 | def getecho (self): |
|
748 | def getecho (self): | |
749 |
|
749 | |||
750 | """This returns the terminal echo mode. This returns True if echo is |
|
750 | """This returns the terminal echo mode. This returns True if echo is | |
751 | on or False if echo is off. Child applications that are expecting you |
|
751 | on or False if echo is off. Child applications that are expecting you | |
752 | to enter a password often set ECHO False. See waitnoecho(). """ |
|
752 | to enter a password often set ECHO False. See waitnoecho(). """ | |
753 |
|
753 | |||
754 | attr = termios.tcgetattr(self.child_fd) |
|
754 | attr = termios.tcgetattr(self.child_fd) | |
755 | if attr[3] & termios.ECHO: |
|
755 | if attr[3] & termios.ECHO: | |
756 | return True |
|
756 | return True | |
757 | return False |
|
757 | return False | |
758 |
|
758 | |||
759 | def setecho (self, state): |
|
759 | def setecho (self, state): | |
760 |
|
760 | |||
761 | """This sets the terminal echo mode on or off. Note that anything the |
|
761 | """This sets the terminal echo mode on or off. Note that anything the | |
762 | child sent before the echo will be lost, so you should be sure that |
|
762 | child sent before the echo will be lost, so you should be sure that | |
763 | your input buffer is empty before you call setecho(). For example, the |
|
763 | your input buffer is empty before you call setecho(). For example, the | |
764 | following will work as expected:: |
|
764 | following will work as expected:: | |
765 |
|
765 | |||
766 | p = pexpect.spawn('cat') |
|
766 | p = pexpect.spawn('cat') | |
767 | p.sendline ('1234') # We will see this twice (once from tty echo and again from cat). |
|
767 | p.sendline ('1234') # We will see this twice (once from tty echo and again from cat). | |
768 | p.expect (['1234']) |
|
768 | p.expect (['1234']) | |
769 | p.expect (['1234']) |
|
769 | p.expect (['1234']) | |
770 | p.setecho(False) # Turn off tty echo |
|
770 | p.setecho(False) # Turn off tty echo | |
771 | p.sendline ('abcd') # We will set this only once (echoed by cat). |
|
771 | p.sendline ('abcd') # We will set this only once (echoed by cat). | |
772 | p.sendline ('wxyz') # We will set this only once (echoed by cat) |
|
772 | p.sendline ('wxyz') # We will set this only once (echoed by cat) | |
773 | p.expect (['abcd']) |
|
773 | p.expect (['abcd']) | |
774 | p.expect (['wxyz']) |
|
774 | p.expect (['wxyz']) | |
775 |
|
775 | |||
776 | The following WILL NOT WORK because the lines sent before the setecho |
|
776 | The following WILL NOT WORK because the lines sent before the setecho | |
777 | will be lost:: |
|
777 | will be lost:: | |
778 |
|
778 | |||
779 | p = pexpect.spawn('cat') |
|
779 | p = pexpect.spawn('cat') | |
780 | p.sendline ('1234') # We will see this twice (once from tty echo and again from cat). |
|
780 | p.sendline ('1234') # We will see this twice (once from tty echo and again from cat). | |
781 | p.setecho(False) # Turn off tty echo |
|
781 | p.setecho(False) # Turn off tty echo | |
782 | p.sendline ('abcd') # We will set this only once (echoed by cat). |
|
782 | p.sendline ('abcd') # We will set this only once (echoed by cat). | |
783 | p.sendline ('wxyz') # We will set this only once (echoed by cat) |
|
783 | p.sendline ('wxyz') # We will set this only once (echoed by cat) | |
784 | p.expect (['1234']) |
|
784 | p.expect (['1234']) | |
785 | p.expect (['1234']) |
|
785 | p.expect (['1234']) | |
786 | p.expect (['abcd']) |
|
786 | p.expect (['abcd']) | |
787 | p.expect (['wxyz']) |
|
787 | p.expect (['wxyz']) | |
788 | """ |
|
788 | """ | |
789 |
|
789 | |||
790 | self.child_fd |
|
790 | self.child_fd | |
791 | attr = termios.tcgetattr(self.child_fd) |
|
791 | attr = termios.tcgetattr(self.child_fd) | |
792 | if state: |
|
792 | if state: | |
793 | attr[3] = attr[3] | termios.ECHO |
|
793 | attr[3] = attr[3] | termios.ECHO | |
794 | else: |
|
794 | else: | |
795 | attr[3] = attr[3] & ~termios.ECHO |
|
795 | attr[3] = attr[3] & ~termios.ECHO | |
796 | # I tried TCSADRAIN and TCSAFLUSH, but these were inconsistent |
|
796 | # I tried TCSADRAIN and TCSAFLUSH, but these were inconsistent | |
797 | # and blocked on some platforms. TCSADRAIN is probably ideal if it worked. |
|
797 | # and blocked on some platforms. TCSADRAIN is probably ideal if it worked. | |
798 | termios.tcsetattr(self.child_fd, termios.TCSANOW, attr) |
|
798 | termios.tcsetattr(self.child_fd, termios.TCSANOW, attr) | |
799 |
|
799 | |||
800 | def read_nonblocking (self, size = 1, timeout = -1): |
|
800 | def read_nonblocking (self, size = 1, timeout = -1): | |
801 |
|
801 | |||
802 | """This reads at most size bytes from the child application. It |
|
802 | """This reads at most size bytes from the child application. It | |
803 | includes a timeout. If the read does not complete within the timeout |
|
803 | includes a timeout. If the read does not complete within the timeout | |
804 | period then a TIMEOUT exception is raised. If the end of file is read |
|
804 | period then a TIMEOUT exception is raised. If the end of file is read | |
805 | then an EOF exception will be raised. If a log file was set using |
|
805 | then an EOF exception will be raised. If a log file was set using | |
806 | setlog() then all data will also be written to the log file. |
|
806 | setlog() then all data will also be written to the log file. | |
807 |
|
807 | |||
808 | If timeout is None then the read may block indefinitely. If timeout is -1 |
|
808 | If timeout is None then the read may block indefinitely. If timeout is -1 | |
809 | then the self.timeout value is used. If timeout is 0 then the child is |
|
809 | then the self.timeout value is used. If timeout is 0 then the child is | |
810 | polled and if there was no data immediately ready then this will raise |
|
810 | polled and if there was no data immediately ready then this will raise | |
811 | a TIMEOUT exception. |
|
811 | a TIMEOUT exception. | |
812 |
|
812 | |||
813 | The timeout refers only to the amount of time to read at least one |
|
813 | The timeout refers only to the amount of time to read at least one | |
814 | character. This is not effected by the 'size' parameter, so if you call |
|
814 | character. This is not effected by the 'size' parameter, so if you call | |
815 | read_nonblocking(size=100, timeout=30) and only one character is |
|
815 | read_nonblocking(size=100, timeout=30) and only one character is | |
816 | available right away then one character will be returned immediately. |
|
816 | available right away then one character will be returned immediately. | |
817 | It will not wait for 30 seconds for another 99 characters to come in. |
|
817 | It will not wait for 30 seconds for another 99 characters to come in. | |
818 |
|
818 | |||
819 | This is a wrapper around os.read(). It uses select.select() to |
|
819 | This is a wrapper around os.read(). It uses select.select() to | |
820 | implement the timeout. """ |
|
820 | implement the timeout. """ | |
821 |
|
821 | |||
822 | if self.closed: |
|
822 | if self.closed: | |
823 | raise ValueError ('I/O operation on closed file in read_nonblocking().') |
|
823 | raise ValueError ('I/O operation on closed file in read_nonblocking().') | |
824 |
|
824 | |||
825 | if timeout == -1: |
|
825 | if timeout == -1: | |
826 | timeout = self.timeout |
|
826 | timeout = self.timeout | |
827 |
|
827 | |||
828 | # Note that some systems such as Solaris do not give an EOF when |
|
828 | # Note that some systems such as Solaris do not give an EOF when | |
829 | # the child dies. In fact, you can still try to read |
|
829 | # the child dies. In fact, you can still try to read | |
830 | # from the child_fd -- it will block forever or until TIMEOUT. |
|
830 | # from the child_fd -- it will block forever or until TIMEOUT. | |
831 | # For this case, I test isalive() before doing any reading. |
|
831 | # For this case, I test isalive() before doing any reading. | |
832 | # If isalive() is false, then I pretend that this is the same as EOF. |
|
832 | # If isalive() is false, then I pretend that this is the same as EOF. | |
833 | if not self.isalive(): |
|
833 | if not self.isalive(): | |
834 | r,w,e = self.__select([self.child_fd], [], [], 0) # timeout of 0 means "poll" |
|
834 | r,w,e = self.__select([self.child_fd], [], [], 0) # timeout of 0 means "poll" | |
835 | if not r: |
|
835 | if not r: | |
836 | self.flag_eof = True |
|
836 | self.flag_eof = True | |
837 | raise EOF ('End Of File (EOF) in read_nonblocking(). Braindead platform.') |
|
837 | raise EOF ('End Of File (EOF) in read_nonblocking(). Braindead platform.') | |
838 | elif self.__irix_hack: |
|
838 | elif self.__irix_hack: | |
839 | # This is a hack for Irix. It seems that Irix requires a long delay before checking isalive. |
|
839 | # This is a hack for Irix. It seems that Irix requires a long delay before checking isalive. | |
840 | # This adds a 2 second delay, but only when the child is terminated. |
|
840 | # This adds a 2 second delay, but only when the child is terminated. | |
841 | r, w, e = self.__select([self.child_fd], [], [], 2) |
|
841 | r, w, e = self.__select([self.child_fd], [], [], 2) | |
842 | if not r and not self.isalive(): |
|
842 | if not r and not self.isalive(): | |
843 | self.flag_eof = True |
|
843 | self.flag_eof = True | |
844 | raise EOF ('End Of File (EOF) in read_nonblocking(). Pokey platform.') |
|
844 | raise EOF ('End Of File (EOF) in read_nonblocking(). Pokey platform.') | |
845 |
|
845 | |||
846 | r,w,e = self.__select([self.child_fd], [], [], timeout) |
|
846 | r,w,e = self.__select([self.child_fd], [], [], timeout) | |
847 |
|
847 | |||
848 | if not r: |
|
848 | if not r: | |
849 | if not self.isalive(): |
|
849 | if not self.isalive(): | |
850 | # Some platforms, such as Irix, will claim that their processes are alive; |
|
850 | # Some platforms, such as Irix, will claim that their processes are alive; | |
851 | # then timeout on the select; and then finally admit that they are not alive. |
|
851 | # then timeout on the select; and then finally admit that they are not alive. | |
852 | self.flag_eof = True |
|
852 | self.flag_eof = True | |
853 | raise EOF ('End of File (EOF) in read_nonblocking(). Very pokey platform.') |
|
853 | raise EOF ('End of File (EOF) in read_nonblocking(). Very pokey platform.') | |
854 | else: |
|
854 | else: | |
855 | raise TIMEOUT ('Timeout exceeded in read_nonblocking().') |
|
855 | raise TIMEOUT ('Timeout exceeded in read_nonblocking().') | |
856 |
|
856 | |||
857 | if self.child_fd in r: |
|
857 | if self.child_fd in r: | |
858 | try: |
|
858 | try: | |
859 | s = os.read(self.child_fd, size) |
|
859 | s = os.read(self.child_fd, size) | |
860 | except OSError, e: # Linux does this |
|
860 | except OSError, e: # Linux does this | |
861 | self.flag_eof = True |
|
861 | self.flag_eof = True | |
862 | raise EOF ('End Of File (EOF) in read_nonblocking(). Exception style platform.') |
|
862 | raise EOF ('End Of File (EOF) in read_nonblocking(). Exception style platform.') | |
863 | if s == b'': # BSD style |
|
863 | if s == b'': # BSD style | |
864 | self.flag_eof = True |
|
864 | self.flag_eof = True | |
865 | raise EOF ('End Of File (EOF) in read_nonblocking(). Empty string style platform.') |
|
865 | raise EOF ('End Of File (EOF) in read_nonblocking(). Empty string style platform.') | |
866 |
|
866 | |||
867 | s2 = self._cast_buffer_type(s) |
|
867 | s2 = self._cast_buffer_type(s) | |
868 | if self.logfile is not None: |
|
868 | if self.logfile is not None: | |
869 | self.logfile.write(s2) |
|
869 | self.logfile.write(s2) | |
870 | self.logfile.flush() |
|
870 | self.logfile.flush() | |
871 | if self.logfile_read is not None: |
|
871 | if self.logfile_read is not None: | |
872 | self.logfile_read.write(s2) |
|
872 | self.logfile_read.write(s2) | |
873 | self.logfile_read.flush() |
|
873 | self.logfile_read.flush() | |
874 |
|
874 | |||
875 | return s |
|
875 | return s | |
876 |
|
876 | |||
877 | raise ExceptionPexpect ('Reached an unexpected state in read_nonblocking().') |
|
877 | raise ExceptionPexpect ('Reached an unexpected state in read_nonblocking().') | |
878 |
|
878 | |||
879 | def read (self, size = -1): # File-like object. |
|
879 | def read (self, size = -1): # File-like object. | |
880 | """This reads at most "size" bytes from the file (less if the read hits |
|
880 | """This reads at most "size" bytes from the file (less if the read hits | |
881 | EOF before obtaining size bytes). If the size argument is negative or |
|
881 | EOF before obtaining size bytes). If the size argument is negative or | |
882 | omitted, read all data until EOF is reached. The bytes are returned as |
|
882 | omitted, read all data until EOF is reached. The bytes are returned as | |
883 | a string object. An empty string is returned when EOF is encountered |
|
883 | a string object. An empty string is returned when EOF is encountered | |
884 | immediately. """ |
|
884 | immediately. """ | |
885 |
|
885 | |||
886 | if size == 0: |
|
886 | if size == 0: | |
887 | return self._empty_buffer |
|
887 | return self._empty_buffer | |
888 | if size < 0: |
|
888 | if size < 0: | |
889 | self.expect (self.delimiter) # delimiter default is EOF |
|
889 | self.expect (self.delimiter) # delimiter default is EOF | |
890 | return self.before |
|
890 | return self.before | |
891 |
|
891 | |||
892 | # I could have done this more directly by not using expect(), but |
|
892 | # I could have done this more directly by not using expect(), but | |
893 | # I deliberately decided to couple read() to expect() so that |
|
893 | # I deliberately decided to couple read() to expect() so that | |
894 | # I would catch any bugs early and ensure consistant behavior. |
|
894 | # I would catch any bugs early and ensure consistant behavior. | |
895 | # It's a little less efficient, but there is less for me to |
|
895 | # It's a little less efficient, but there is less for me to | |
896 | # worry about if I have to later modify read() or expect(). |
|
896 | # worry about if I have to later modify read() or expect(). | |
897 | # Note, it's OK if size==-1 in the regex. That just means it |
|
897 | # Note, it's OK if size==-1 in the regex. That just means it | |
898 | # will never match anything in which case we stop only on EOF. |
|
898 | # will never match anything in which case we stop only on EOF. | |
899 | if self._buffer_type is bytes: |
|
899 | if self._buffer_type is bytes: | |
900 | pat = (u'.{%d}' % size).encode('ascii') |
|
900 | pat = (u'.{%d}' % size).encode('ascii') | |
901 | else: |
|
901 | else: | |
902 | pat = u'.{%d}' % size |
|
902 | pat = u'.{%d}' % size | |
903 | cre = re.compile(pat, re.DOTALL) |
|
903 | cre = re.compile(pat, re.DOTALL) | |
904 | index = self.expect ([cre, self.delimiter]) # delimiter default is EOF |
|
904 | index = self.expect ([cre, self.delimiter]) # delimiter default is EOF | |
905 | if index == 0: |
|
905 | if index == 0: | |
906 | return self.after ### self.before should be ''. Should I assert this? |
|
906 | return self.after ### self.before should be ''. Should I assert this? | |
907 | return self.before |
|
907 | return self.before | |
908 |
|
908 | |||
909 | def readline(self, size = -1): |
|
909 | def readline(self, size = -1): | |
910 | """This reads and returns one entire line. A trailing newline is kept |
|
910 | """This reads and returns one entire line. A trailing newline is kept | |
911 | in the string, but may be absent when a file ends with an incomplete |
|
911 | in the string, but may be absent when a file ends with an incomplete | |
912 | line. Note: This readline() looks for a \\r\\n pair even on UNIX |
|
912 | line. Note: This readline() looks for a \\r\\n pair even on UNIX | |
913 | because this is what the pseudo tty device returns. So contrary to what |
|
913 | because this is what the pseudo tty device returns. So contrary to what | |
914 | you may expect you will receive the newline as \\r\\n. An empty string |
|
914 | you may expect you will receive the newline as \\r\\n. An empty string | |
915 | is returned when EOF is hit immediately. Currently, the size argument is |
|
915 | is returned when EOF is hit immediately. Currently, the size argument is | |
916 | mostly ignored, so this behavior is not standard for a file-like |
|
916 | mostly ignored, so this behavior is not standard for a file-like | |
917 | object. If size is 0 then an empty string is returned. """ |
|
917 | object. If size is 0 then an empty string is returned. """ | |
918 |
|
918 | |||
919 | if size == 0: |
|
919 | if size == 0: | |
920 | return self._empty_buffer |
|
920 | return self._empty_buffer | |
921 | index = self.expect ([self._pty_newline, self.delimiter]) # delimiter default is EOF |
|
921 | index = self.expect ([self._pty_newline, self.delimiter]) # delimiter default is EOF | |
922 | if index == 0: |
|
922 | if index == 0: | |
923 | return self.before + self._pty_newline |
|
923 | return self.before + self._pty_newline | |
924 | return self.before |
|
924 | return self.before | |
925 |
|
925 | |||
926 | def __iter__ (self): # File-like object. |
|
926 | def __iter__ (self): # File-like object. | |
927 |
|
927 | |||
928 | """This is to support iterators over a file-like object. |
|
928 | """This is to support iterators over a file-like object. | |
929 | """ |
|
929 | """ | |
930 |
|
930 | |||
931 | return self |
|
931 | return self | |
932 |
|
932 | |||
933 | def next (self): # File-like object. |
|
933 | def next (self): # File-like object. | |
934 |
|
934 | |||
935 | """This is to support iterators over a file-like object. |
|
935 | """This is to support iterators over a file-like object. | |
936 | """ |
|
936 | """ | |
937 |
|
937 | |||
938 | result = self.readline() |
|
938 | result = self.readline() | |
939 | if result == self._empty_buffer: |
|
939 | if result == self._empty_buffer: | |
940 | raise StopIteration |
|
940 | raise StopIteration | |
941 | return result |
|
941 | return result | |
942 |
|
942 | |||
943 | def readlines (self, sizehint = -1): # File-like object. |
|
943 | def readlines (self, sizehint = -1): # File-like object. | |
944 |
|
944 | |||
945 | """This reads until EOF using readline() and returns a list containing |
|
945 | """This reads until EOF using readline() and returns a list containing | |
946 | the lines thus read. The optional "sizehint" argument is ignored. """ |
|
946 | the lines thus read. The optional "sizehint" argument is ignored. """ | |
947 |
|
947 | |||
948 | lines = [] |
|
948 | lines = [] | |
949 | while True: |
|
949 | while True: | |
950 | line = self.readline() |
|
950 | line = self.readline() | |
951 | if not line: |
|
951 | if not line: | |
952 | break |
|
952 | break | |
953 | lines.append(line) |
|
953 | lines.append(line) | |
954 | return lines |
|
954 | return lines | |
955 |
|
955 | |||
956 | def write(self, s): # File-like object. |
|
956 | def write(self, s): # File-like object. | |
957 |
|
957 | |||
958 | """This is similar to send() except that there is no return value. |
|
958 | """This is similar to send() except that there is no return value. | |
959 | """ |
|
959 | """ | |
960 |
|
960 | |||
961 | self.send (s) |
|
961 | self.send (s) | |
962 |
|
962 | |||
963 | def writelines (self, sequence): # File-like object. |
|
963 | def writelines (self, sequence): # File-like object. | |
964 |
|
964 | |||
965 | """This calls write() for each element in the sequence. The sequence |
|
965 | """This calls write() for each element in the sequence. The sequence | |
966 | can be any iterable object producing strings, typically a list of |
|
966 | can be any iterable object producing strings, typically a list of | |
967 | strings. This does not add line separators There is no return value. |
|
967 | strings. This does not add line separators There is no return value. | |
968 | """ |
|
968 | """ | |
969 |
|
969 | |||
970 | for s in sequence: |
|
970 | for s in sequence: | |
971 | self.write (s) |
|
971 | self.write (s) | |
972 |
|
972 | |||
973 | def send(self, s): |
|
973 | def send(self, s): | |
974 |
|
974 | |||
975 | """This sends a string to the child process. This returns the number of |
|
975 | """This sends a string to the child process. This returns the number of | |
976 | bytes written. If a log file was set then the data is also written to |
|
976 | bytes written. If a log file was set then the data is also written to | |
977 | the log. """ |
|
977 | the log. """ | |
978 |
|
978 | |||
979 | time.sleep(self.delaybeforesend) |
|
979 | time.sleep(self.delaybeforesend) | |
980 |
|
980 | |||
981 | s2 = self._cast_buffer_type(s) |
|
981 | s2 = self._cast_buffer_type(s) | |
982 | if self.logfile is not None: |
|
982 | if self.logfile is not None: | |
983 | self.logfile.write(s2) |
|
983 | self.logfile.write(s2) | |
984 | self.logfile.flush() |
|
984 | self.logfile.flush() | |
985 | if self.logfile_send is not None: |
|
985 | if self.logfile_send is not None: | |
986 | self.logfile_send.write(s2) |
|
986 | self.logfile_send.write(s2) | |
987 | self.logfile_send.flush() |
|
987 | self.logfile_send.flush() | |
988 | c = os.write (self.child_fd, _cast_bytes(s, self.encoding)) |
|
988 | c = os.write (self.child_fd, _cast_bytes(s, self.encoding)) | |
989 | return c |
|
989 | return c | |
990 |
|
990 | |||
991 | def sendline(self, s=''): |
|
991 | def sendline(self, s=''): | |
992 |
|
992 | |||
993 | """This is like send(), but it adds a line feed (os.linesep). This |
|
993 | """This is like send(), but it adds a line feed (os.linesep). This | |
994 | returns the number of bytes written. """ |
|
994 | returns the number of bytes written. """ | |
995 |
|
995 | |||
996 | n = self.send (s) |
|
996 | n = self.send (s) | |
997 | n = n + self.send (os.linesep) |
|
997 | n = n + self.send (os.linesep) | |
998 | return n |
|
998 | return n | |
999 |
|
999 | |||
1000 | def sendcontrol(self, char): |
|
1000 | def sendcontrol(self, char): | |
1001 |
|
1001 | |||
1002 | """This sends a control character to the child such as Ctrl-C or |
|
1002 | """This sends a control character to the child such as Ctrl-C or | |
1003 | Ctrl-D. For example, to send a Ctrl-G (ASCII 7):: |
|
1003 | Ctrl-D. For example, to send a Ctrl-G (ASCII 7):: | |
1004 |
|
1004 | |||
1005 | child.sendcontrol('g') |
|
1005 | child.sendcontrol('g') | |
1006 |
|
1006 | |||
1007 | See also, sendintr() and sendeof(). |
|
1007 | See also, sendintr() and sendeof(). | |
1008 | """ |
|
1008 | """ | |
1009 |
|
1009 | |||
1010 | char = char.lower() |
|
1010 | char = char.lower() | |
1011 | a = ord(char) |
|
1011 | a = ord(char) | |
1012 | if a>=97 and a<=122: |
|
1012 | if a>=97 and a<=122: | |
1013 | a = a - ord('a') + 1 |
|
1013 | a = a - ord('a') + 1 | |
1014 | return self.send (chr(a)) |
|
1014 | return self.send (chr(a)) | |
1015 | d = {'@':0, '`':0, |
|
1015 | d = {'@':0, '`':0, | |
1016 | '[':27, '{':27, |
|
1016 | '[':27, '{':27, | |
1017 | '\\':28, '|':28, |
|
1017 | '\\':28, '|':28, | |
1018 | ']':29, '}': 29, |
|
1018 | ']':29, '}': 29, | |
1019 | '^':30, '~':30, |
|
1019 | '^':30, '~':30, | |
1020 | '_':31, |
|
1020 | '_':31, | |
1021 | '?':127} |
|
1021 | '?':127} | |
1022 | if char not in d: |
|
1022 | if char not in d: | |
1023 | return 0 |
|
1023 | return 0 | |
1024 | return self.send (chr(d[char])) |
|
1024 | return self.send (chr(d[char])) | |
1025 |
|
1025 | |||
1026 | def sendeof(self): |
|
1026 | def sendeof(self): | |
1027 |
|
1027 | |||
1028 | """This sends an EOF to the child. This sends a character which causes |
|
1028 | """This sends an EOF to the child. This sends a character which causes | |
1029 | the pending parent output buffer to be sent to the waiting child |
|
1029 | the pending parent output buffer to be sent to the waiting child | |
1030 | program without waiting for end-of-line. If it is the first character |
|
1030 | program without waiting for end-of-line. If it is the first character | |
1031 | of the line, the read() in the user program returns 0, which signifies |
|
1031 | of the line, the read() in the user program returns 0, which signifies | |
1032 | end-of-file. This means to work as expected a sendeof() has to be |
|
1032 | end-of-file. This means to work as expected a sendeof() has to be | |
1033 | called at the beginning of a line. This method does not send a newline. |
|
1033 | called at the beginning of a line. This method does not send a newline. | |
1034 | It is the responsibility of the caller to ensure the eof is sent at the |
|
1034 | It is the responsibility of the caller to ensure the eof is sent at the | |
1035 | beginning of a line. """ |
|
1035 | beginning of a line. """ | |
1036 |
|
1036 | |||
1037 | ### Hmmm... how do I send an EOF? |
|
1037 | ### Hmmm... how do I send an EOF? | |
1038 | ###C if ((m = write(pty, *buf, p - *buf)) < 0) |
|
1038 | ###C if ((m = write(pty, *buf, p - *buf)) < 0) | |
1039 | ###C return (errno == EWOULDBLOCK) ? n : -1; |
|
1039 | ###C return (errno == EWOULDBLOCK) ? n : -1; | |
1040 | #fd = sys.stdin.fileno() |
|
1040 | #fd = sys.stdin.fileno() | |
1041 | #old = termios.tcgetattr(fd) # remember current state |
|
1041 | #old = termios.tcgetattr(fd) # remember current state | |
1042 | #attr = termios.tcgetattr(fd) |
|
1042 | #attr = termios.tcgetattr(fd) | |
1043 | #attr[3] = attr[3] | termios.ICANON # ICANON must be set to recognize EOF |
|
1043 | #attr[3] = attr[3] | termios.ICANON # ICANON must be set to recognize EOF | |
1044 | #try: # use try/finally to ensure state gets restored |
|
1044 | #try: # use try/finally to ensure state gets restored | |
1045 | # termios.tcsetattr(fd, termios.TCSADRAIN, attr) |
|
1045 | # termios.tcsetattr(fd, termios.TCSADRAIN, attr) | |
1046 | # if hasattr(termios, 'CEOF'): |
|
1046 | # if hasattr(termios, 'CEOF'): | |
1047 | # os.write (self.child_fd, '%c' % termios.CEOF) |
|
1047 | # os.write (self.child_fd, '%c' % termios.CEOF) | |
1048 | # else: |
|
1048 | # else: | |
1049 | # # Silly platform does not define CEOF so assume CTRL-D |
|
1049 | # # Silly platform does not define CEOF so assume CTRL-D | |
1050 | # os.write (self.child_fd, '%c' % 4) |
|
1050 | # os.write (self.child_fd, '%c' % 4) | |
1051 | #finally: # restore state |
|
1051 | #finally: # restore state | |
1052 | # termios.tcsetattr(fd, termios.TCSADRAIN, old) |
|
1052 | # termios.tcsetattr(fd, termios.TCSADRAIN, old) | |
1053 | if hasattr(termios, 'VEOF'): |
|
1053 | if hasattr(termios, 'VEOF'): | |
1054 | char = termios.tcgetattr(self.child_fd)[6][termios.VEOF] |
|
1054 | char = termios.tcgetattr(self.child_fd)[6][termios.VEOF] | |
1055 | else: |
|
1055 | else: | |
1056 | # platform does not define VEOF so assume CTRL-D |
|
1056 | # platform does not define VEOF so assume CTRL-D | |
1057 | char = chr(4) |
|
1057 | char = chr(4) | |
1058 | self.send(char) |
|
1058 | self.send(char) | |
1059 |
|
1059 | |||
1060 | def sendintr(self): |
|
1060 | def sendintr(self): | |
1061 |
|
1061 | |||
1062 | """This sends a SIGINT to the child. It does not require |
|
1062 | """This sends a SIGINT to the child. It does not require | |
1063 | the SIGINT to be the first character on a line. """ |
|
1063 | the SIGINT to be the first character on a line. """ | |
1064 |
|
1064 | |||
1065 | if hasattr(termios, 'VINTR'): |
|
1065 | if hasattr(termios, 'VINTR'): | |
1066 | char = termios.tcgetattr(self.child_fd)[6][termios.VINTR] |
|
1066 | char = termios.tcgetattr(self.child_fd)[6][termios.VINTR] | |
1067 | else: |
|
1067 | else: | |
1068 | # platform does not define VINTR so assume CTRL-C |
|
1068 | # platform does not define VINTR so assume CTRL-C | |
1069 | char = chr(3) |
|
1069 | char = chr(3) | |
1070 | self.send (char) |
|
1070 | self.send (char) | |
1071 |
|
1071 | |||
1072 | def eof (self): |
|
1072 | def eof (self): | |
1073 |
|
1073 | |||
1074 | """This returns True if the EOF exception was ever raised. |
|
1074 | """This returns True if the EOF exception was ever raised. | |
1075 | """ |
|
1075 | """ | |
1076 |
|
1076 | |||
1077 | return self.flag_eof |
|
1077 | return self.flag_eof | |
1078 |
|
1078 | |||
1079 | def terminate(self, force=False): |
|
1079 | def terminate(self, force=False): | |
1080 |
|
1080 | |||
1081 | """This forces a child process to terminate. It starts nicely with |
|
1081 | """This forces a child process to terminate. It starts nicely with | |
1082 | SIGHUP and SIGINT. If "force" is True then moves onto SIGKILL. This |
|
1082 | SIGHUP and SIGINT. If "force" is True then moves onto SIGKILL. This | |
1083 | returns True if the child was terminated. This returns False if the |
|
1083 | returns True if the child was terminated. This returns False if the | |
1084 | child could not be terminated. """ |
|
1084 | child could not be terminated. """ | |
1085 |
|
1085 | |||
1086 | if not self.isalive(): |
|
1086 | if not self.isalive(): | |
1087 | return True |
|
1087 | return True | |
1088 | try: |
|
1088 | try: | |
1089 | self.kill(signal.SIGHUP) |
|
1089 | self.kill(signal.SIGHUP) | |
1090 | time.sleep(self.delayafterterminate) |
|
1090 | time.sleep(self.delayafterterminate) | |
1091 | if not self.isalive(): |
|
1091 | if not self.isalive(): | |
1092 | return True |
|
1092 | return True | |
1093 | self.kill(signal.SIGCONT) |
|
1093 | self.kill(signal.SIGCONT) | |
1094 | time.sleep(self.delayafterterminate) |
|
1094 | time.sleep(self.delayafterterminate) | |
1095 | if not self.isalive(): |
|
1095 | if not self.isalive(): | |
1096 | return True |
|
1096 | return True | |
1097 | self.kill(signal.SIGINT) |
|
1097 | self.kill(signal.SIGINT) | |
1098 | time.sleep(self.delayafterterminate) |
|
1098 | time.sleep(self.delayafterterminate) | |
1099 | if not self.isalive(): |
|
1099 | if not self.isalive(): | |
1100 | return True |
|
1100 | return True | |
1101 | if force: |
|
1101 | if force: | |
1102 | self.kill(signal.SIGKILL) |
|
1102 | self.kill(signal.SIGKILL) | |
1103 | time.sleep(self.delayafterterminate) |
|
1103 | time.sleep(self.delayafterterminate) | |
1104 | if not self.isalive(): |
|
1104 | if not self.isalive(): | |
1105 | return True |
|
1105 | return True | |
1106 | else: |
|
1106 | else: | |
1107 | return False |
|
1107 | return False | |
1108 | return False |
|
1108 | return False | |
1109 | except OSError, e: |
|
1109 | except OSError, e: | |
1110 | # I think there are kernel timing issues that sometimes cause |
|
1110 | # I think there are kernel timing issues that sometimes cause | |
1111 | # this to happen. I think isalive() reports True, but the |
|
1111 | # this to happen. I think isalive() reports True, but the | |
1112 | # process is dead to the kernel. |
|
1112 | # process is dead to the kernel. | |
1113 | # Make one last attempt to see if the kernel is up to date. |
|
1113 | # Make one last attempt to see if the kernel is up to date. | |
1114 | time.sleep(self.delayafterterminate) |
|
1114 | time.sleep(self.delayafterterminate) | |
1115 | if not self.isalive(): |
|
1115 | if not self.isalive(): | |
1116 | return True |
|
1116 | return True | |
1117 | else: |
|
1117 | else: | |
1118 | return False |
|
1118 | return False | |
1119 |
|
1119 | |||
1120 | def wait(self): |
|
1120 | def wait(self): | |
1121 |
|
1121 | |||
1122 | """This waits until the child exits. This is a blocking call. This will |
|
1122 | """This waits until the child exits. This is a blocking call. This will | |
1123 | not read any data from the child, so this will block forever if the |
|
1123 | not read any data from the child, so this will block forever if the | |
1124 | child has unread output and has terminated. In other words, the child |
|
1124 | child has unread output and has terminated. In other words, the child | |
1125 | may have printed output then called exit(); but, technically, the child |
|
1125 | may have printed output then called exit(); but, technically, the child | |
1126 | is still alive until its output is read. """ |
|
1126 | is still alive until its output is read. """ | |
1127 |
|
1127 | |||
1128 | if self.isalive(): |
|
1128 | if self.isalive(): | |
1129 | pid, status = os.waitpid(self.pid, 0) |
|
1129 | pid, status = os.waitpid(self.pid, 0) | |
1130 | else: |
|
1130 | else: | |
1131 | raise ExceptionPexpect ('Cannot wait for dead child process.') |
|
1131 | raise ExceptionPexpect ('Cannot wait for dead child process.') | |
1132 | self.exitstatus = os.WEXITSTATUS(status) |
|
1132 | self.exitstatus = os.WEXITSTATUS(status) | |
1133 | if os.WIFEXITED (status): |
|
1133 | if os.WIFEXITED (status): | |
1134 | self.status = status |
|
1134 | self.status = status | |
1135 | self.exitstatus = os.WEXITSTATUS(status) |
|
1135 | self.exitstatus = os.WEXITSTATUS(status) | |
1136 | self.signalstatus = None |
|
1136 | self.signalstatus = None | |
1137 | self.terminated = True |
|
1137 | self.terminated = True | |
1138 | elif os.WIFSIGNALED (status): |
|
1138 | elif os.WIFSIGNALED (status): | |
1139 | self.status = status |
|
1139 | self.status = status | |
1140 | self.exitstatus = None |
|
1140 | self.exitstatus = None | |
1141 | self.signalstatus = os.WTERMSIG(status) |
|
1141 | self.signalstatus = os.WTERMSIG(status) | |
1142 | self.terminated = True |
|
1142 | self.terminated = True | |
1143 | elif os.WIFSTOPPED (status): |
|
1143 | elif os.WIFSTOPPED (status): | |
1144 | raise ExceptionPexpect ('Wait was called for a child process that is stopped. This is not supported. Is some other process attempting job control with our child pid?') |
|
1144 | raise ExceptionPexpect ('Wait was called for a child process that is stopped. This is not supported. Is some other process attempting job control with our child pid?') | |
1145 | return self.exitstatus |
|
1145 | return self.exitstatus | |
1146 |
|
1146 | |||
1147 | def isalive(self): |
|
1147 | def isalive(self): | |
1148 |
|
1148 | |||
1149 | """This tests if the child process is running or not. This is |
|
1149 | """This tests if the child process is running or not. This is | |
1150 | non-blocking. If the child was terminated then this will read the |
|
1150 | non-blocking. If the child was terminated then this will read the | |
1151 | exitstatus or signalstatus of the child. This returns True if the child |
|
1151 | exitstatus or signalstatus of the child. This returns True if the child | |
1152 | process appears to be running or False if not. It can take literally |
|
1152 | process appears to be running or False if not. It can take literally | |
1153 | SECONDS for Solaris to return the right status. """ |
|
1153 | SECONDS for Solaris to return the right status. """ | |
1154 |
|
1154 | |||
1155 | if self.terminated: |
|
1155 | if self.terminated: | |
1156 | return False |
|
1156 | return False | |
1157 |
|
1157 | |||
1158 | if self.flag_eof: |
|
1158 | if self.flag_eof: | |
1159 | # This is for Linux, which requires the blocking form of waitpid to get |
|
1159 | # This is for Linux, which requires the blocking form of waitpid to get | |
1160 | # status of a defunct process. This is super-lame. The flag_eof would have |
|
1160 | # status of a defunct process. This is super-lame. The flag_eof would have | |
1161 | # been set in read_nonblocking(), so this should be safe. |
|
1161 | # been set in read_nonblocking(), so this should be safe. | |
1162 | waitpid_options = 0 |
|
1162 | waitpid_options = 0 | |
1163 | else: |
|
1163 | else: | |
1164 | waitpid_options = os.WNOHANG |
|
1164 | waitpid_options = os.WNOHANG | |
1165 |
|
1165 | |||
1166 | try: |
|
1166 | try: | |
1167 | pid, status = os.waitpid(self.pid, waitpid_options) |
|
1167 | pid, status = os.waitpid(self.pid, waitpid_options) | |
1168 | except OSError as e: # No child processes |
|
1168 | except OSError as e: # No child processes | |
1169 | if e.errno == errno.ECHILD: |
|
1169 | if e.errno == errno.ECHILD: | |
1170 | raise ExceptionPexpect ('isalive() encountered condition where "terminated" is 0, but there was no child process. Did someone else call waitpid() on our process?') |
|
1170 | raise ExceptionPexpect ('isalive() encountered condition where "terminated" is 0, but there was no child process. Did someone else call waitpid() on our process?') | |
1171 | else: |
|
1171 | else: | |
1172 | raise e |
|
1172 | raise e | |
1173 |
|
1173 | |||
1174 | # I have to do this twice for Solaris. I can't even believe that I figured this out... |
|
1174 | # I have to do this twice for Solaris. I can't even believe that I figured this out... | |
1175 | # If waitpid() returns 0 it means that no child process wishes to |
|
1175 | # If waitpid() returns 0 it means that no child process wishes to | |
1176 | # report, and the value of status is undefined. |
|
1176 | # report, and the value of status is undefined. | |
1177 | if pid == 0: |
|
1177 | if pid == 0: | |
1178 | try: |
|
1178 | try: | |
1179 | pid, status = os.waitpid(self.pid, waitpid_options) ### os.WNOHANG) # Solaris! |
|
1179 | pid, status = os.waitpid(self.pid, waitpid_options) ### os.WNOHANG) # Solaris! | |
1180 | except OSError, e: # This should never happen... |
|
1180 | except OSError, e: # This should never happen... | |
1181 | if e[0] == errno.ECHILD: |
|
1181 | if e[0] == errno.ECHILD: | |
1182 | raise ExceptionPexpect ('isalive() encountered condition that should never happen. There was no child process. Did someone else call waitpid() on our process?') |
|
1182 | raise ExceptionPexpect ('isalive() encountered condition that should never happen. There was no child process. Did someone else call waitpid() on our process?') | |
1183 | else: |
|
1183 | else: | |
1184 | raise e |
|
1184 | raise e | |
1185 |
|
1185 | |||
1186 | # If pid is still 0 after two calls to waitpid() then |
|
1186 | # If pid is still 0 after two calls to waitpid() then | |
1187 | # the process really is alive. This seems to work on all platforms, except |
|
1187 | # the process really is alive. This seems to work on all platforms, except | |
1188 | # for Irix which seems to require a blocking call on waitpid or select, so I let read_nonblocking |
|
1188 | # for Irix which seems to require a blocking call on waitpid or select, so I let read_nonblocking | |
1189 | # take care of this situation (unfortunately, this requires waiting through the timeout). |
|
1189 | # take care of this situation (unfortunately, this requires waiting through the timeout). | |
1190 | if pid == 0: |
|
1190 | if pid == 0: | |
1191 | return True |
|
1191 | return True | |
1192 |
|
1192 | |||
1193 | if pid == 0: |
|
1193 | if pid == 0: | |
1194 | return True |
|
1194 | return True | |
1195 |
|
1195 | |||
1196 | if os.WIFEXITED (status): |
|
1196 | if os.WIFEXITED (status): | |
1197 | self.status = status |
|
1197 | self.status = status | |
1198 | self.exitstatus = os.WEXITSTATUS(status) |
|
1198 | self.exitstatus = os.WEXITSTATUS(status) | |
1199 | self.signalstatus = None |
|
1199 | self.signalstatus = None | |
1200 | self.terminated = True |
|
1200 | self.terminated = True | |
1201 | elif os.WIFSIGNALED (status): |
|
1201 | elif os.WIFSIGNALED (status): | |
1202 | self.status = status |
|
1202 | self.status = status | |
1203 | self.exitstatus = None |
|
1203 | self.exitstatus = None | |
1204 | self.signalstatus = os.WTERMSIG(status) |
|
1204 | self.signalstatus = os.WTERMSIG(status) | |
1205 | self.terminated = True |
|
1205 | self.terminated = True | |
1206 | elif os.WIFSTOPPED (status): |
|
1206 | elif os.WIFSTOPPED (status): | |
1207 | raise ExceptionPexpect ('isalive() encountered condition where child process is stopped. This is not supported. Is some other process attempting job control with our child pid?') |
|
1207 | raise ExceptionPexpect ('isalive() encountered condition where child process is stopped. This is not supported. Is some other process attempting job control with our child pid?') | |
1208 | return False |
|
1208 | return False | |
1209 |
|
1209 | |||
1210 | def kill(self, sig): |
|
1210 | def kill(self, sig): | |
1211 |
|
1211 | |||
1212 | """This sends the given signal to the child application. In keeping |
|
1212 | """This sends the given signal to the child application. In keeping | |
1213 | with UNIX tradition it has a misleading name. It does not necessarily |
|
1213 | with UNIX tradition it has a misleading name. It does not necessarily | |
1214 | kill the child unless you send the right signal. """ |
|
1214 | kill the child unless you send the right signal. """ | |
1215 |
|
1215 | |||
1216 | # Same as os.kill, but the pid is given for you. |
|
1216 | # Same as os.kill, but the pid is given for you. | |
1217 | if self.isalive(): |
|
1217 | if self.isalive(): | |
1218 | os.kill(self.pid, sig) |
|
1218 | os.kill(self.pid, sig) | |
1219 |
|
1219 | |||
1220 | def compile_pattern_list(self, patterns): |
|
1220 | def compile_pattern_list(self, patterns): | |
1221 |
|
1221 | |||
1222 | """This compiles a pattern-string or a list of pattern-strings. |
|
1222 | """This compiles a pattern-string or a list of pattern-strings. | |
1223 | Patterns must be a StringType, EOF, TIMEOUT, SRE_Pattern, or a list of |
|
1223 | Patterns must be a StringType, EOF, TIMEOUT, SRE_Pattern, or a list of | |
1224 | those. Patterns may also be None which results in an empty list (you |
|
1224 | those. Patterns may also be None which results in an empty list (you | |
1225 | might do this if waiting for an EOF or TIMEOUT condition without |
|
1225 | might do this if waiting for an EOF or TIMEOUT condition without | |
1226 | expecting any pattern). |
|
1226 | expecting any pattern). | |
1227 |
|
1227 | |||
1228 | This is used by expect() when calling expect_list(). Thus expect() is |
|
1228 | This is used by expect() when calling expect_list(). Thus expect() is | |
1229 | nothing more than:: |
|
1229 | nothing more than:: | |
1230 |
|
1230 | |||
1231 | cpl = self.compile_pattern_list(pl) |
|
1231 | cpl = self.compile_pattern_list(pl) | |
1232 | return self.expect_list(cpl, timeout) |
|
1232 | return self.expect_list(cpl, timeout) | |
1233 |
|
1233 | |||
1234 | If you are using expect() within a loop it may be more |
|
1234 | If you are using expect() within a loop it may be more | |
1235 | efficient to compile the patterns first and then call expect_list(). |
|
1235 | efficient to compile the patterns first and then call expect_list(). | |
1236 | This avoid calls in a loop to compile_pattern_list():: |
|
1236 | This avoid calls in a loop to compile_pattern_list():: | |
1237 |
|
1237 | |||
1238 | cpl = self.compile_pattern_list(my_pattern) |
|
1238 | cpl = self.compile_pattern_list(my_pattern) | |
1239 | while some_condition: |
|
1239 | while some_condition: | |
1240 | ... |
|
1240 | ... | |
1241 | i = self.expect_list(clp, timeout) |
|
1241 | i = self.expect_list(clp, timeout) | |
1242 | ... |
|
1242 | ... | |
1243 | """ |
|
1243 | """ | |
1244 |
|
1244 | |||
1245 | if patterns is None: |
|
1245 | if patterns is None: | |
1246 | return [] |
|
1246 | return [] | |
1247 | if not isinstance(patterns, list): |
|
1247 | if not isinstance(patterns, list): | |
1248 | patterns = [patterns] |
|
1248 | patterns = [patterns] | |
1249 |
|
1249 | |||
1250 | compile_flags = re.DOTALL # Allow dot to match \n |
|
1250 | compile_flags = re.DOTALL # Allow dot to match \n | |
1251 | if self.ignorecase: |
|
1251 | if self.ignorecase: | |
1252 | compile_flags = compile_flags | re.IGNORECASE |
|
1252 | compile_flags = compile_flags | re.IGNORECASE | |
1253 | compiled_pattern_list = [] |
|
1253 | compiled_pattern_list = [] | |
1254 | for p in patterns: |
|
1254 | for p in patterns: | |
1255 | if isinstance(p, (bytes, unicode)): |
|
1255 | if isinstance(p, (bytes, unicode)): | |
1256 | p = self._cast_buffer_type(p) |
|
1256 | p = self._cast_buffer_type(p) | |
1257 | compiled_pattern_list.append(re.compile(p, compile_flags)) |
|
1257 | compiled_pattern_list.append(re.compile(p, compile_flags)) | |
1258 | elif p is EOF: |
|
1258 | elif p is EOF: | |
1259 | compiled_pattern_list.append(EOF) |
|
1259 | compiled_pattern_list.append(EOF) | |
1260 | elif p is TIMEOUT: |
|
1260 | elif p is TIMEOUT: | |
1261 | compiled_pattern_list.append(TIMEOUT) |
|
1261 | compiled_pattern_list.append(TIMEOUT) | |
1262 | elif type(p) is re_type: |
|
1262 | elif type(p) is re_type: | |
1263 | p = self._prepare_regex_pattern(p) |
|
1263 | p = self._prepare_regex_pattern(p) | |
1264 | compiled_pattern_list.append(p) |
|
1264 | compiled_pattern_list.append(p) | |
1265 | else: |
|
1265 | else: | |
1266 | raise TypeError ('Argument must be one of StringTypes, EOF, TIMEOUT, SRE_Pattern, or a list of those type. %s' % str(type(p))) |
|
1266 | raise TypeError ('Argument must be one of StringTypes, EOF, TIMEOUT, SRE_Pattern, or a list of those type. %s' % str(type(p))) | |
1267 |
|
1267 | |||
1268 | return compiled_pattern_list |
|
1268 | return compiled_pattern_list | |
1269 |
|
1269 | |||
1270 | def _prepare_regex_pattern(self, p): |
|
1270 | def _prepare_regex_pattern(self, p): | |
1271 | "Recompile unicode regexes as bytes regexes. Overridden in subclass." |
|
1271 | "Recompile unicode regexes as bytes regexes. Overridden in subclass." | |
1272 | if isinstance(p.pattern, unicode): |
|
1272 | if isinstance(p.pattern, unicode): | |
1273 | p = re.compile(p.pattern.encode('utf-8'), p.flags &~ re.UNICODE) |
|
1273 | p = re.compile(p.pattern.encode('utf-8'), p.flags &~ re.UNICODE) | |
1274 | return p |
|
1274 | return p | |
1275 |
|
1275 | |||
1276 | def expect(self, pattern, timeout = -1, searchwindowsize=-1): |
|
1276 | def expect(self, pattern, timeout = -1, searchwindowsize=-1): | |
1277 |
|
1277 | |||
1278 | """This seeks through the stream until a pattern is matched. The |
|
1278 | """This seeks through the stream until a pattern is matched. The | |
1279 | pattern is overloaded and may take several types. The pattern can be a |
|
1279 | pattern is overloaded and may take several types. The pattern can be a | |
1280 | StringType, EOF, a compiled re, or a list of any of those types. |
|
1280 | StringType, EOF, a compiled re, or a list of any of those types. | |
1281 | Strings will be compiled to re types. This returns the index into the |
|
1281 | Strings will be compiled to re types. This returns the index into the | |
1282 | pattern list. If the pattern was not a list this returns index 0 on a |
|
1282 | pattern list. If the pattern was not a list this returns index 0 on a | |
1283 | successful match. This may raise exceptions for EOF or TIMEOUT. To |
|
1283 | successful match. This may raise exceptions for EOF or TIMEOUT. To | |
1284 | avoid the EOF or TIMEOUT exceptions add EOF or TIMEOUT to the pattern |
|
1284 | avoid the EOF or TIMEOUT exceptions add EOF or TIMEOUT to the pattern | |
1285 | list. That will cause expect to match an EOF or TIMEOUT condition |
|
1285 | list. That will cause expect to match an EOF or TIMEOUT condition | |
1286 | instead of raising an exception. |
|
1286 | instead of raising an exception. | |
1287 |
|
1287 | |||
1288 | If you pass a list of patterns and more than one matches, the first match |
|
1288 | If you pass a list of patterns and more than one matches, the first match | |
1289 | in the stream is chosen. If more than one pattern matches at that point, |
|
1289 | in the stream is chosen. If more than one pattern matches at that point, | |
1290 | the leftmost in the pattern list is chosen. For example:: |
|
1290 | the leftmost in the pattern list is chosen. For example:: | |
1291 |
|
1291 | |||
1292 | # the input is 'foobar' |
|
1292 | # the input is 'foobar' | |
1293 | index = p.expect (['bar', 'foo', 'foobar']) |
|
1293 | index = p.expect (['bar', 'foo', 'foobar']) | |
1294 | # returns 1 ('foo') even though 'foobar' is a "better" match |
|
1294 | # returns 1 ('foo') even though 'foobar' is a "better" match | |
1295 |
|
1295 | |||
1296 | Please note, however, that buffering can affect this behavior, since |
|
1296 | Please note, however, that buffering can affect this behavior, since | |
1297 | input arrives in unpredictable chunks. For example:: |
|
1297 | input arrives in unpredictable chunks. For example:: | |
1298 |
|
1298 | |||
1299 | # the input is 'foobar' |
|
1299 | # the input is 'foobar' | |
1300 | index = p.expect (['foobar', 'foo']) |
|
1300 | index = p.expect (['foobar', 'foo']) | |
1301 | # returns 0 ('foobar') if all input is available at once, |
|
1301 | # returns 0 ('foobar') if all input is available at once, | |
1302 | # but returs 1 ('foo') if parts of the final 'bar' arrive late |
|
1302 | # but returs 1 ('foo') if parts of the final 'bar' arrive late | |
1303 |
|
1303 | |||
1304 | After a match is found the instance attributes 'before', 'after' and |
|
1304 | After a match is found the instance attributes 'before', 'after' and | |
1305 | 'match' will be set. You can see all the data read before the match in |
|
1305 | 'match' will be set. You can see all the data read before the match in | |
1306 | 'before'. You can see the data that was matched in 'after'. The |
|
1306 | 'before'. You can see the data that was matched in 'after'. The | |
1307 | re.MatchObject used in the re match will be in 'match'. If an error |
|
1307 | re.MatchObject used in the re match will be in 'match'. If an error | |
1308 | occurred then 'before' will be set to all the data read so far and |
|
1308 | occurred then 'before' will be set to all the data read so far and | |
1309 | 'after' and 'match' will be None. |
|
1309 | 'after' and 'match' will be None. | |
1310 |
|
1310 | |||
1311 | If timeout is -1 then timeout will be set to the self.timeout value. |
|
1311 | If timeout is -1 then timeout will be set to the self.timeout value. | |
1312 |
|
1312 | |||
1313 | A list entry may be EOF or TIMEOUT instead of a string. This will |
|
1313 | A list entry may be EOF or TIMEOUT instead of a string. This will | |
1314 | catch these exceptions and return the index of the list entry instead |
|
1314 | catch these exceptions and return the index of the list entry instead | |
1315 | of raising the exception. The attribute 'after' will be set to the |
|
1315 | of raising the exception. The attribute 'after' will be set to the | |
1316 | exception type. The attribute 'match' will be None. This allows you to |
|
1316 | exception type. The attribute 'match' will be None. This allows you to | |
1317 | write code like this:: |
|
1317 | write code like this:: | |
1318 |
|
1318 | |||
1319 | index = p.expect (['good', 'bad', pexpect.EOF, pexpect.TIMEOUT]) |
|
1319 | index = p.expect (['good', 'bad', pexpect.EOF, pexpect.TIMEOUT]) | |
1320 | if index == 0: |
|
1320 | if index == 0: | |
1321 | do_something() |
|
1321 | do_something() | |
1322 | elif index == 1: |
|
1322 | elif index == 1: | |
1323 | do_something_else() |
|
1323 | do_something_else() | |
1324 | elif index == 2: |
|
1324 | elif index == 2: | |
1325 | do_some_other_thing() |
|
1325 | do_some_other_thing() | |
1326 | elif index == 3: |
|
1326 | elif index == 3: | |
1327 | do_something_completely_different() |
|
1327 | do_something_completely_different() | |
1328 |
|
1328 | |||
1329 | instead of code like this:: |
|
1329 | instead of code like this:: | |
1330 |
|
1330 | |||
1331 | try: |
|
1331 | try: | |
1332 | index = p.expect (['good', 'bad']) |
|
1332 | index = p.expect (['good', 'bad']) | |
1333 | if index == 0: |
|
1333 | if index == 0: | |
1334 | do_something() |
|
1334 | do_something() | |
1335 | elif index == 1: |
|
1335 | elif index == 1: | |
1336 | do_something_else() |
|
1336 | do_something_else() | |
1337 | except EOF: |
|
1337 | except EOF: | |
1338 | do_some_other_thing() |
|
1338 | do_some_other_thing() | |
1339 | except TIMEOUT: |
|
1339 | except TIMEOUT: | |
1340 | do_something_completely_different() |
|
1340 | do_something_completely_different() | |
1341 |
|
1341 | |||
1342 | These two forms are equivalent. It all depends on what you want. You |
|
1342 | These two forms are equivalent. It all depends on what you want. You | |
1343 | can also just expect the EOF if you are waiting for all output of a |
|
1343 | can also just expect the EOF if you are waiting for all output of a | |
1344 | child to finish. For example:: |
|
1344 | child to finish. For example:: | |
1345 |
|
1345 | |||
1346 | p = pexpect.spawn('/bin/ls') |
|
1346 | p = pexpect.spawn('/bin/ls') | |
1347 | p.expect (pexpect.EOF) |
|
1347 | p.expect (pexpect.EOF) | |
1348 | print p.before |
|
1348 | print p.before | |
1349 |
|
1349 | |||
1350 | If you are trying to optimize for speed then see expect_list(). |
|
1350 | If you are trying to optimize for speed then see expect_list(). | |
1351 | """ |
|
1351 | """ | |
1352 |
|
1352 | |||
1353 | compiled_pattern_list = self.compile_pattern_list(pattern) |
|
1353 | compiled_pattern_list = self.compile_pattern_list(pattern) | |
1354 | return self.expect_list(compiled_pattern_list, timeout, searchwindowsize) |
|
1354 | return self.expect_list(compiled_pattern_list, timeout, searchwindowsize) | |
1355 |
|
1355 | |||
1356 | def expect_list(self, pattern_list, timeout = -1, searchwindowsize = -1): |
|
1356 | def expect_list(self, pattern_list, timeout = -1, searchwindowsize = -1): | |
1357 |
|
1357 | |||
1358 | """This takes a list of compiled regular expressions and returns the |
|
1358 | """This takes a list of compiled regular expressions and returns the | |
1359 | index into the pattern_list that matched the child output. The list may |
|
1359 | index into the pattern_list that matched the child output. The list may | |
1360 | also contain EOF or TIMEOUT (which are not compiled regular |
|
1360 | also contain EOF or TIMEOUT (which are not compiled regular | |
1361 | expressions). This method is similar to the expect() method except that |
|
1361 | expressions). This method is similar to the expect() method except that | |
1362 | expect_list() does not recompile the pattern list on every call. This |
|
1362 | expect_list() does not recompile the pattern list on every call. This | |
1363 | may help if you are trying to optimize for speed, otherwise just use |
|
1363 | may help if you are trying to optimize for speed, otherwise just use | |
1364 | the expect() method. This is called by expect(). If timeout==-1 then |
|
1364 | the expect() method. This is called by expect(). If timeout==-1 then | |
1365 | the self.timeout value is used. If searchwindowsize==-1 then the |
|
1365 | the self.timeout value is used. If searchwindowsize==-1 then the | |
1366 | self.searchwindowsize value is used. """ |
|
1366 | self.searchwindowsize value is used. """ | |
1367 |
|
1367 | |||
1368 | return self.expect_loop(searcher_re(pattern_list), timeout, searchwindowsize) |
|
1368 | return self.expect_loop(searcher_re(pattern_list), timeout, searchwindowsize) | |
1369 |
|
1369 | |||
1370 | def expect_exact(self, pattern_list, timeout = -1, searchwindowsize = -1): |
|
1370 | def expect_exact(self, pattern_list, timeout = -1, searchwindowsize = -1): | |
1371 |
|
1371 | |||
1372 | """This is similar to expect(), but uses plain string matching instead |
|
1372 | """This is similar to expect(), but uses plain string matching instead | |
1373 | of compiled regular expressions in 'pattern_list'. The 'pattern_list' |
|
1373 | of compiled regular expressions in 'pattern_list'. The 'pattern_list' | |
1374 | may be a string; a list or other sequence of strings; or TIMEOUT and |
|
1374 | may be a string; a list or other sequence of strings; or TIMEOUT and | |
1375 | EOF. |
|
1375 | EOF. | |
1376 |
|
1376 | |||
1377 | This call might be faster than expect() for two reasons: string |
|
1377 | This call might be faster than expect() for two reasons: string | |
1378 | searching is faster than RE matching and it is possible to limit the |
|
1378 | searching is faster than RE matching and it is possible to limit the | |
1379 | search to just the end of the input buffer. |
|
1379 | search to just the end of the input buffer. | |
1380 |
|
1380 | |||
1381 | This method is also useful when you don't want to have to worry about |
|
1381 | This method is also useful when you don't want to have to worry about | |
1382 | escaping regular expression characters that you want to match.""" |
|
1382 | escaping regular expression characters that you want to match.""" | |
1383 |
|
1383 | |||
1384 | if isinstance(pattern_list, (bytes, unicode)) or pattern_list in (TIMEOUT, EOF): |
|
1384 | if isinstance(pattern_list, (bytes, unicode)) or pattern_list in (TIMEOUT, EOF): | |
1385 | pattern_list = [pattern_list] |
|
1385 | pattern_list = [pattern_list] | |
1386 | return self.expect_loop(searcher_string(pattern_list), timeout, searchwindowsize) |
|
1386 | return self.expect_loop(searcher_string(pattern_list), timeout, searchwindowsize) | |
1387 |
|
1387 | |||
1388 | def expect_loop(self, searcher, timeout = -1, searchwindowsize = -1): |
|
1388 | def expect_loop(self, searcher, timeout = -1, searchwindowsize = -1): | |
1389 |
|
1389 | |||
1390 | """This is the common loop used inside expect. The 'searcher' should be |
|
1390 | """This is the common loop used inside expect. The 'searcher' should be | |
1391 | an instance of searcher_re or searcher_string, which describes how and what |
|
1391 | an instance of searcher_re or searcher_string, which describes how and what | |
1392 | to search for in the input. |
|
1392 | to search for in the input. | |
1393 |
|
1393 | |||
1394 | See expect() for other arguments, return value and exceptions. """ |
|
1394 | See expect() for other arguments, return value and exceptions. """ | |
1395 |
|
1395 | |||
1396 | self.searcher = searcher |
|
1396 | self.searcher = searcher | |
1397 |
|
1397 | |||
1398 | if timeout == -1: |
|
1398 | if timeout == -1: | |
1399 | timeout = self.timeout |
|
1399 | timeout = self.timeout | |
1400 | if timeout is not None: |
|
1400 | if timeout is not None: | |
1401 | end_time = time.time() + timeout |
|
1401 | end_time = time.time() + timeout | |
1402 | if searchwindowsize == -1: |
|
1402 | if searchwindowsize == -1: | |
1403 | searchwindowsize = self.searchwindowsize |
|
1403 | searchwindowsize = self.searchwindowsize | |
1404 |
|
1404 | |||
1405 | try: |
|
1405 | try: | |
1406 | incoming = self.buffer |
|
1406 | incoming = self.buffer | |
1407 | freshlen = len(incoming) |
|
1407 | freshlen = len(incoming) | |
1408 | while True: # Keep reading until exception or return. |
|
1408 | while True: # Keep reading until exception or return. | |
1409 | index = searcher.search(incoming, freshlen, searchwindowsize) |
|
1409 | index = searcher.search(incoming, freshlen, searchwindowsize) | |
1410 | if index >= 0: |
|
1410 | if index >= 0: | |
1411 | self.buffer = incoming[searcher.end : ] |
|
1411 | self.buffer = incoming[searcher.end : ] | |
1412 | self.before = incoming[ : searcher.start] |
|
1412 | self.before = incoming[ : searcher.start] | |
1413 | self.after = incoming[searcher.start : searcher.end] |
|
1413 | self.after = incoming[searcher.start : searcher.end] | |
1414 | self.match = searcher.match |
|
1414 | self.match = searcher.match | |
1415 | self.match_index = index |
|
1415 | self.match_index = index | |
1416 | return self.match_index |
|
1416 | return self.match_index | |
1417 | # No match at this point |
|
1417 | # No match at this point | |
1418 | if timeout is not None and timeout < 0: |
|
1418 | if timeout is not None and timeout < 0: | |
1419 | raise TIMEOUT ('Timeout exceeded in expect_any().') |
|
1419 | raise TIMEOUT ('Timeout exceeded in expect_any().') | |
1420 | # Still have time left, so read more data |
|
1420 | # Still have time left, so read more data | |
1421 | c = self.read_nonblocking (self.maxread, timeout) |
|
1421 | c = self.read_nonblocking (self.maxread, timeout) | |
1422 | freshlen = len(c) |
|
1422 | freshlen = len(c) | |
1423 | time.sleep (0.0001) |
|
1423 | time.sleep (0.0001) | |
1424 | incoming = incoming + c |
|
1424 | incoming = incoming + c | |
1425 | if timeout is not None: |
|
1425 | if timeout is not None: | |
1426 | timeout = end_time - time.time() |
|
1426 | timeout = end_time - time.time() | |
1427 | except EOF, e: |
|
1427 | except EOF, e: | |
1428 | self.buffer = self._empty_buffer |
|
1428 | self.buffer = self._empty_buffer | |
1429 | self.before = incoming |
|
1429 | self.before = incoming | |
1430 | self.after = EOF |
|
1430 | self.after = EOF | |
1431 | index = searcher.eof_index |
|
1431 | index = searcher.eof_index | |
1432 | if index >= 0: |
|
1432 | if index >= 0: | |
1433 | self.match = EOF |
|
1433 | self.match = EOF | |
1434 | self.match_index = index |
|
1434 | self.match_index = index | |
1435 | return self.match_index |
|
1435 | return self.match_index | |
1436 | else: |
|
1436 | else: | |
1437 | self.match = None |
|
1437 | self.match = None | |
1438 | self.match_index = None |
|
1438 | self.match_index = None | |
1439 | raise EOF (str(e) + '\n' + str(self)) |
|
1439 | raise EOF (str(e) + '\n' + str(self)) | |
1440 | except TIMEOUT, e: |
|
1440 | except TIMEOUT, e: | |
1441 | self.buffer = incoming |
|
1441 | self.buffer = incoming | |
1442 | self.before = incoming |
|
1442 | self.before = incoming | |
1443 | self.after = TIMEOUT |
|
1443 | self.after = TIMEOUT | |
1444 | index = searcher.timeout_index |
|
1444 | index = searcher.timeout_index | |
1445 | if index >= 0: |
|
1445 | if index >= 0: | |
1446 | self.match = TIMEOUT |
|
1446 | self.match = TIMEOUT | |
1447 | self.match_index = index |
|
1447 | self.match_index = index | |
1448 | return self.match_index |
|
1448 | return self.match_index | |
1449 | else: |
|
1449 | else: | |
1450 | self.match = None |
|
1450 | self.match = None | |
1451 | self.match_index = None |
|
1451 | self.match_index = None | |
1452 | raise TIMEOUT (str(e) + '\n' + str(self)) |
|
1452 | raise TIMEOUT (str(e) + '\n' + str(self)) | |
1453 | except: |
|
1453 | except: | |
1454 | self.before = incoming |
|
1454 | self.before = incoming | |
1455 | self.after = None |
|
1455 | self.after = None | |
1456 | self.match = None |
|
1456 | self.match = None | |
1457 | self.match_index = None |
|
1457 | self.match_index = None | |
1458 | raise |
|
1458 | raise | |
1459 |
|
1459 | |||
1460 | def getwinsize(self): |
|
1460 | def getwinsize(self): | |
1461 |
|
1461 | |||
1462 | """This returns the terminal window size of the child tty. The return |
|
1462 | """This returns the terminal window size of the child tty. The return | |
1463 | value is a tuple of (rows, cols). """ |
|
1463 | value is a tuple of (rows, cols). """ | |
1464 |
|
1464 | |||
1465 | TIOCGWINSZ = getattr(termios, 'TIOCGWINSZ', 1074295912L) |
|
1465 | TIOCGWINSZ = getattr(termios, 'TIOCGWINSZ', 1074295912L) | |
1466 | s = struct.pack('HHHH', 0, 0, 0, 0) |
|
1466 | s = struct.pack('HHHH', 0, 0, 0, 0) | |
1467 | x = fcntl.ioctl(self.fileno(), TIOCGWINSZ, s) |
|
1467 | x = fcntl.ioctl(self.fileno(), TIOCGWINSZ, s) | |
1468 | return struct.unpack('HHHH', x)[0:2] |
|
1468 | return struct.unpack('HHHH', x)[0:2] | |
1469 |
|
1469 | |||
1470 | def setwinsize(self, r, c): |
|
1470 | def setwinsize(self, r, c): | |
1471 |
|
1471 | |||
1472 | """This sets the terminal window size of the child tty. This will cause |
|
1472 | """This sets the terminal window size of the child tty. This will cause | |
1473 | a SIGWINCH signal to be sent to the child. This does not change the |
|
1473 | a SIGWINCH signal to be sent to the child. This does not change the | |
1474 | physical window size. It changes the size reported to TTY-aware |
|
1474 | physical window size. It changes the size reported to TTY-aware | |
1475 | applications like vi or curses -- applications that respond to the |
|
1475 | applications like vi or curses -- applications that respond to the | |
1476 | SIGWINCH signal. """ |
|
1476 | SIGWINCH signal. """ | |
1477 |
|
1477 | |||
1478 | # Check for buggy platforms. Some Python versions on some platforms |
|
1478 | # Check for buggy platforms. Some Python versions on some platforms | |
1479 | # (notably OSF1 Alpha and RedHat 7.1) truncate the value for |
|
1479 | # (notably OSF1 Alpha and RedHat 7.1) truncate the value for | |
1480 | # termios.TIOCSWINSZ. It is not clear why this happens. |
|
1480 | # termios.TIOCSWINSZ. It is not clear why this happens. | |
1481 | # These platforms don't seem to handle the signed int very well; |
|
1481 | # These platforms don't seem to handle the signed int very well; | |
1482 | # yet other platforms like OpenBSD have a large negative value for |
|
1482 | # yet other platforms like OpenBSD have a large negative value for | |
1483 | # TIOCSWINSZ and they don't have a truncate problem. |
|
1483 | # TIOCSWINSZ and they don't have a truncate problem. | |
1484 | # Newer versions of Linux have totally different values for TIOCSWINSZ. |
|
1484 | # Newer versions of Linux have totally different values for TIOCSWINSZ. | |
1485 | # Note that this fix is a hack. |
|
1485 | # Note that this fix is a hack. | |
1486 | TIOCSWINSZ = getattr(termios, 'TIOCSWINSZ', -2146929561) |
|
1486 | TIOCSWINSZ = getattr(termios, 'TIOCSWINSZ', -2146929561) | |
1487 | if TIOCSWINSZ == 2148037735L: # L is not required in Python >= 2.2. |
|
1487 | if TIOCSWINSZ == 2148037735L: # L is not required in Python >= 2.2. | |
1488 | TIOCSWINSZ = -2146929561 # Same bits, but with sign. |
|
1488 | TIOCSWINSZ = -2146929561 # Same bits, but with sign. | |
1489 | # Note, assume ws_xpixel and ws_ypixel are zero. |
|
1489 | # Note, assume ws_xpixel and ws_ypixel are zero. | |
1490 | s = struct.pack('HHHH', r, c, 0, 0) |
|
1490 | s = struct.pack('HHHH', r, c, 0, 0) | |
1491 | fcntl.ioctl(self.fileno(), TIOCSWINSZ, s) |
|
1491 | fcntl.ioctl(self.fileno(), TIOCSWINSZ, s) | |
1492 |
|
1492 | |||
1493 | def interact(self, escape_character = b'\x1d', input_filter = None, output_filter = None): |
|
1493 | def interact(self, escape_character = b'\x1d', input_filter = None, output_filter = None): | |
1494 |
|
1494 | |||
1495 | """This gives control of the child process to the interactive user (the |
|
1495 | """This gives control of the child process to the interactive user (the | |
1496 | human at the keyboard). Keystrokes are sent to the child process, and |
|
1496 | human at the keyboard). Keystrokes are sent to the child process, and | |
1497 | the stdout and stderr output of the child process is printed. This |
|
1497 | the stdout and stderr output of the child process is printed. This | |
1498 | simply echos the child stdout and child stderr to the real stdout and |
|
1498 | simply echos the child stdout and child stderr to the real stdout and | |
1499 | it echos the real stdin to the child stdin. When the user types the |
|
1499 | it echos the real stdin to the child stdin. When the user types the | |
1500 | escape_character this method will stop. The default for |
|
1500 | escape_character this method will stop. The default for | |
1501 | escape_character is ^]. This should not be confused with ASCII 27 -- |
|
1501 | escape_character is ^]. This should not be confused with ASCII 27 -- | |
1502 | the ESC character. ASCII 29 was chosen for historical merit because |
|
1502 | the ESC character. ASCII 29 was chosen for historical merit because | |
1503 | this is the character used by 'telnet' as the escape character. The |
|
1503 | this is the character used by 'telnet' as the escape character. The | |
1504 | escape_character will not be sent to the child process. |
|
1504 | escape_character will not be sent to the child process. | |
1505 |
|
1505 | |||
1506 | You may pass in optional input and output filter functions. These |
|
1506 | You may pass in optional input and output filter functions. These | |
1507 | functions should take a string and return a string. The output_filter |
|
1507 | functions should take a string and return a string. The output_filter | |
1508 | will be passed all the output from the child process. The input_filter |
|
1508 | will be passed all the output from the child process. The input_filter | |
1509 | will be passed all the keyboard input from the user. The input_filter |
|
1509 | will be passed all the keyboard input from the user. The input_filter | |
1510 | is run BEFORE the check for the escape_character. |
|
1510 | is run BEFORE the check for the escape_character. | |
1511 |
|
1511 | |||
1512 | Note that if you change the window size of the parent the SIGWINCH |
|
1512 | Note that if you change the window size of the parent the SIGWINCH | |
1513 | signal will not be passed through to the child. If you want the child |
|
1513 | signal will not be passed through to the child. If you want the child | |
1514 | window size to change when the parent's window size changes then do |
|
1514 | window size to change when the parent's window size changes then do | |
1515 | something like the following example:: |
|
1515 | something like the following example:: | |
1516 |
|
1516 | |||
1517 | import pexpect, struct, fcntl, termios, signal, sys |
|
1517 | import pexpect, struct, fcntl, termios, signal, sys | |
1518 | def sigwinch_passthrough (sig, data): |
|
1518 | def sigwinch_passthrough (sig, data): | |
1519 | s = struct.pack("HHHH", 0, 0, 0, 0) |
|
1519 | s = struct.pack("HHHH", 0, 0, 0, 0) | |
1520 | a = struct.unpack('hhhh', fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ , s)) |
|
1520 | a = struct.unpack('hhhh', fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ , s)) | |
1521 | global p |
|
1521 | global p | |
1522 | p.setwinsize(a[0],a[1]) |
|
1522 | p.setwinsize(a[0],a[1]) | |
1523 | p = pexpect.spawn('/bin/bash') # Note this is global and used in sigwinch_passthrough. |
|
1523 | p = pexpect.spawn('/bin/bash') # Note this is global and used in sigwinch_passthrough. | |
1524 | signal.signal(signal.SIGWINCH, sigwinch_passthrough) |
|
1524 | signal.signal(signal.SIGWINCH, sigwinch_passthrough) | |
1525 | p.interact() |
|
1525 | p.interact() | |
1526 | """ |
|
1526 | """ | |
1527 |
|
1527 | |||
1528 | # Flush the buffer. |
|
1528 | # Flush the buffer. | |
1529 | if PY3: self.stdout.write(_cast_unicode(self.buffer, self.encoding)) |
|
1529 | if PY3: self.stdout.write(_cast_unicode(self.buffer, self.encoding)) | |
1530 | else: self.stdout.write(self.buffer) |
|
1530 | else: self.stdout.write(self.buffer) | |
1531 | self.stdout.flush() |
|
1531 | self.stdout.flush() | |
1532 | self.buffer = self._empty_buffer |
|
1532 | self.buffer = self._empty_buffer | |
1533 | mode = tty.tcgetattr(self.STDIN_FILENO) |
|
1533 | mode = tty.tcgetattr(self.STDIN_FILENO) | |
1534 | tty.setraw(self.STDIN_FILENO) |
|
1534 | tty.setraw(self.STDIN_FILENO) | |
1535 | try: |
|
1535 | try: | |
1536 | self.__interact_copy(escape_character, input_filter, output_filter) |
|
1536 | self.__interact_copy(escape_character, input_filter, output_filter) | |
1537 | finally: |
|
1537 | finally: | |
1538 | tty.tcsetattr(self.STDIN_FILENO, tty.TCSAFLUSH, mode) |
|
1538 | tty.tcsetattr(self.STDIN_FILENO, tty.TCSAFLUSH, mode) | |
1539 |
|
1539 | |||
1540 | def __interact_writen(self, fd, data): |
|
1540 | def __interact_writen(self, fd, data): | |
1541 |
|
1541 | |||
1542 | """This is used by the interact() method. |
|
1542 | """This is used by the interact() method. | |
1543 | """ |
|
1543 | """ | |
1544 |
|
1544 | |||
1545 | while data != b'' and self.isalive(): |
|
1545 | while data != b'' and self.isalive(): | |
1546 | n = os.write(fd, data) |
|
1546 | n = os.write(fd, data) | |
1547 | data = data[n:] |
|
1547 | data = data[n:] | |
1548 |
|
1548 | |||
1549 | def __interact_read(self, fd): |
|
1549 | def __interact_read(self, fd): | |
1550 |
|
1550 | |||
1551 | """This is used by the interact() method. |
|
1551 | """This is used by the interact() method. | |
1552 | """ |
|
1552 | """ | |
1553 |
|
1553 | |||
1554 | return os.read(fd, 1000) |
|
1554 | return os.read(fd, 1000) | |
1555 |
|
1555 | |||
1556 | def __interact_copy(self, escape_character = None, input_filter = None, output_filter = None): |
|
1556 | def __interact_copy(self, escape_character = None, input_filter = None, output_filter = None): | |
1557 |
|
1557 | |||
1558 | """This is used by the interact() method. |
|
1558 | """This is used by the interact() method. | |
1559 | """ |
|
1559 | """ | |
1560 |
|
1560 | |||
1561 | while self.isalive(): |
|
1561 | while self.isalive(): | |
1562 | r,w,e = self.__select([self.child_fd, self.STDIN_FILENO], [], []) |
|
1562 | r,w,e = self.__select([self.child_fd, self.STDIN_FILENO], [], []) | |
1563 | if self.child_fd in r: |
|
1563 | if self.child_fd in r: | |
1564 | data = self.__interact_read(self.child_fd) |
|
1564 | data = self.__interact_read(self.child_fd) | |
1565 | if output_filter: data = output_filter(data) |
|
1565 | if output_filter: data = output_filter(data) | |
1566 | if self.logfile is not None: |
|
1566 | if self.logfile is not None: | |
1567 | self.logfile.write (data) |
|
1567 | self.logfile.write (data) | |
1568 | self.logfile.flush() |
|
1568 | self.logfile.flush() | |
1569 | os.write(self.STDOUT_FILENO, data) |
|
1569 | os.write(self.STDOUT_FILENO, data) | |
1570 | if self.STDIN_FILENO in r: |
|
1570 | if self.STDIN_FILENO in r: | |
1571 | data = self.__interact_read(self.STDIN_FILENO) |
|
1571 | data = self.__interact_read(self.STDIN_FILENO) | |
1572 | if input_filter: data = input_filter(data) |
|
1572 | if input_filter: data = input_filter(data) | |
1573 | i = data.rfind(escape_character) |
|
1573 | i = data.rfind(escape_character) | |
1574 | if i != -1: |
|
1574 | if i != -1: | |
1575 | data = data[:i] |
|
1575 | data = data[:i] | |
1576 | self.__interact_writen(self.child_fd, data) |
|
1576 | self.__interact_writen(self.child_fd, data) | |
1577 | break |
|
1577 | break | |
1578 | self.__interact_writen(self.child_fd, data) |
|
1578 | self.__interact_writen(self.child_fd, data) | |
1579 |
|
1579 | |||
1580 | def __select (self, iwtd, owtd, ewtd, timeout=None): |
|
1580 | def __select (self, iwtd, owtd, ewtd, timeout=None): | |
1581 |
|
1581 | |||
1582 | """This is a wrapper around select.select() that ignores signals. If |
|
1582 | """This is a wrapper around select.select() that ignores signals. If | |
1583 | select.select raises a select.error exception and errno is an EINTR |
|
1583 | select.select raises a select.error exception and errno is an EINTR | |
1584 | error then it is ignored. Mainly this is used to ignore sigwinch |
|
1584 | error then it is ignored. Mainly this is used to ignore sigwinch | |
1585 | (terminal resize). """ |
|
1585 | (terminal resize). """ | |
1586 |
|
1586 | |||
1587 | # if select() is interrupted by a signal (errno==EINTR) then |
|
1587 | # if select() is interrupted by a signal (errno==EINTR) then | |
1588 | # we loop back and enter the select() again. |
|
1588 | # we loop back and enter the select() again. | |
1589 | if timeout is not None: |
|
1589 | if timeout is not None: | |
1590 | end_time = time.time() + timeout |
|
1590 | end_time = time.time() + timeout | |
1591 | while True: |
|
1591 | while True: | |
1592 | try: |
|
1592 | try: | |
1593 | return select.select (iwtd, owtd, ewtd, timeout) |
|
1593 | return select.select (iwtd, owtd, ewtd, timeout) | |
1594 | except select.error as e: |
|
1594 | except select.error as e: | |
1595 | if e.args[0] == errno.EINTR: |
|
1595 | if e.args[0] == errno.EINTR: | |
1596 | # if we loop back we have to subtract the amount of time we already waited. |
|
1596 | # if we loop back we have to subtract the amount of time we already waited. | |
1597 | if timeout is not None: |
|
1597 | if timeout is not None: | |
1598 | timeout = end_time - time.time() |
|
1598 | timeout = end_time - time.time() | |
1599 | if timeout < 0: |
|
1599 | if timeout < 0: | |
1600 | return ([],[],[]) |
|
1600 | return ([],[],[]) | |
1601 | else: # something else caused the select.error, so this really is an exception |
|
1601 | else: # something else caused the select.error, so this really is an exception | |
1602 | raise |
|
1602 | raise | |
1603 |
|
1603 | |||
1604 | class spawn(spawnb): |
|
1604 | class spawn(spawnb): | |
1605 | """This is the main class interface for Pexpect. Use this class to start |
|
1605 | """This is the main class interface for Pexpect. Use this class to start | |
1606 | and control child applications.""" |
|
1606 | and control child applications.""" | |
1607 |
|
1607 | |||
1608 | _buffer_type = unicode |
|
1608 | _buffer_type = unicode | |
1609 | def _cast_buffer_type(self, s): |
|
1609 | def _cast_buffer_type(self, s): | |
1610 | return _cast_unicode(s, self.encoding) |
|
1610 | return _cast_unicode(s, self.encoding) | |
1611 | _empty_buffer = u'' |
|
1611 | _empty_buffer = u'' | |
1612 | _pty_newline = u'\r\n' |
|
1612 | _pty_newline = u'\r\n' | |
1613 |
|
1613 | |||
1614 | def __init__(self, command, args=[], timeout=30, maxread=2000, searchwindowsize=None, |
|
1614 | def __init__(self, command, args=[], timeout=30, maxread=2000, searchwindowsize=None, | |
1615 | logfile=None, cwd=None, env=None, encoding='utf-8'): |
|
1615 | logfile=None, cwd=None, env=None, encoding='utf-8'): | |
1616 | super(spawn, self).__init__(command, args, timeout=timeout, maxread=maxread, |
|
1616 | super(spawn, self).__init__(command, args, timeout=timeout, maxread=maxread, | |
1617 | searchwindowsize=searchwindowsize, logfile=logfile, cwd=cwd, env=env) |
|
1617 | searchwindowsize=searchwindowsize, logfile=logfile, cwd=cwd, env=env) | |
1618 | self.encoding = encoding |
|
1618 | self.encoding = encoding | |
1619 |
|
1619 | |||
1620 | def _prepare_regex_pattern(self, p): |
|
1620 | def _prepare_regex_pattern(self, p): | |
1621 | "Recompile bytes regexes as unicode regexes." |
|
1621 | "Recompile bytes regexes as unicode regexes." | |
1622 | if isinstance(p.pattern, bytes): |
|
1622 | if isinstance(p.pattern, bytes): | |
1623 | p = re.compile(p.pattern.decode(self.encoding), p.flags) |
|
1623 | p = re.compile(p.pattern.decode(self.encoding), p.flags) | |
1624 | return p |
|
1624 | return p | |
1625 |
|
1625 | |||
1626 | def read_nonblocking(self, size=1, timeout=-1): |
|
1626 | def read_nonblocking(self, size=1, timeout=-1): | |
1627 | return super(spawn, self).read_nonblocking(size=size, timeout=timeout)\ |
|
1627 | return super(spawn, self).read_nonblocking(size=size, timeout=timeout)\ | |
1628 | .decode(self.encoding) |
|
1628 | .decode(self.encoding) | |
1629 |
|
1629 | |||
1630 | read_nonblocking.__doc__ = spawnb.read_nonblocking.__doc__ |
|
1630 | read_nonblocking.__doc__ = spawnb.read_nonblocking.__doc__ | |
1631 |
|
1631 | |||
1632 |
|
1632 | |||
1633 | ############################################################################## |
|
1633 | ############################################################################## | |
1634 | # End of spawn class |
|
1634 | # End of spawn class | |
1635 | ############################################################################## |
|
1635 | ############################################################################## | |
1636 |
|
1636 | |||
1637 | class searcher_string (object): |
|
1637 | class searcher_string (object): | |
1638 |
|
1638 | |||
1639 | """This is a plain string search helper for the spawn.expect_any() method. |
|
1639 | """This is a plain string search helper for the spawn.expect_any() method. | |
1640 | This helper class is for speed. For more powerful regex patterns |
|
1640 | This helper class is for speed. For more powerful regex patterns | |
1641 | see the helper class, searcher_re. |
|
1641 | see the helper class, searcher_re. | |
1642 |
|
1642 | |||
1643 | Attributes: |
|
1643 | Attributes: | |
1644 |
|
1644 | |||
1645 | eof_index - index of EOF, or -1 |
|
1645 | eof_index - index of EOF, or -1 | |
1646 | timeout_index - index of TIMEOUT, or -1 |
|
1646 | timeout_index - index of TIMEOUT, or -1 | |
1647 |
|
1647 | |||
1648 | After a successful match by the search() method the following attributes |
|
1648 | After a successful match by the search() method the following attributes | |
1649 | are available: |
|
1649 | are available: | |
1650 |
|
1650 | |||
1651 | start - index into the buffer, first byte of match |
|
1651 | start - index into the buffer, first byte of match | |
1652 | end - index into the buffer, first byte after match |
|
1652 | end - index into the buffer, first byte after match | |
1653 | match - the matching string itself |
|
1653 | match - the matching string itself | |
1654 |
|
1654 | |||
1655 | """ |
|
1655 | """ | |
1656 |
|
1656 | |||
1657 | def __init__(self, strings): |
|
1657 | def __init__(self, strings): | |
1658 |
|
1658 | |||
1659 | """This creates an instance of searcher_string. This argument 'strings' |
|
1659 | """This creates an instance of searcher_string. This argument 'strings' | |
1660 | may be a list; a sequence of strings; or the EOF or TIMEOUT types. """ |
|
1660 | may be a list; a sequence of strings; or the EOF or TIMEOUT types. """ | |
1661 |
|
1661 | |||
1662 | self.eof_index = -1 |
|
1662 | self.eof_index = -1 | |
1663 | self.timeout_index = -1 |
|
1663 | self.timeout_index = -1 | |
1664 | self._strings = [] |
|
1664 | self._strings = [] | |
1665 | for n, s in enumerate(strings): |
|
1665 | for n, s in enumerate(strings): | |
1666 | if s is EOF: |
|
1666 | if s is EOF: | |
1667 | self.eof_index = n |
|
1667 | self.eof_index = n | |
1668 | continue |
|
1668 | continue | |
1669 | if s is TIMEOUT: |
|
1669 | if s is TIMEOUT: | |
1670 | self.timeout_index = n |
|
1670 | self.timeout_index = n | |
1671 | continue |
|
1671 | continue | |
1672 | self._strings.append((n, s)) |
|
1672 | self._strings.append((n, s)) | |
1673 |
|
1673 | |||
1674 | def __str__(self): |
|
1674 | def __str__(self): | |
1675 |
|
1675 | |||
1676 | """This returns a human-readable string that represents the state of |
|
1676 | """This returns a human-readable string that represents the state of | |
1677 | the object.""" |
|
1677 | the object.""" | |
1678 |
|
1678 | |||
1679 | ss = [ (ns[0],' %d: "%s"' % ns) for ns in self._strings ] |
|
1679 | ss = [ (ns[0],' %d: "%s"' % ns) for ns in self._strings ] | |
1680 | ss.append((-1,'searcher_string:')) |
|
1680 | ss.append((-1,'searcher_string:')) | |
1681 | if self.eof_index >= 0: |
|
1681 | if self.eof_index >= 0: | |
1682 | ss.append ((self.eof_index,' %d: EOF' % self.eof_index)) |
|
1682 | ss.append ((self.eof_index,' %d: EOF' % self.eof_index)) | |
1683 | if self.timeout_index >= 0: |
|
1683 | if self.timeout_index >= 0: | |
1684 | ss.append ((self.timeout_index,' %d: TIMEOUT' % self.timeout_index)) |
|
1684 | ss.append ((self.timeout_index,' %d: TIMEOUT' % self.timeout_index)) | |
1685 | ss.sort() |
|
1685 | ss.sort() | |
1686 | return '\n'.join(a[1] for a in ss) |
|
1686 | return '\n'.join(a[1] for a in ss) | |
1687 |
|
1687 | |||
1688 | def search(self, buffer, freshlen, searchwindowsize=None): |
|
1688 | def search(self, buffer, freshlen, searchwindowsize=None): | |
1689 |
|
1689 | |||
1690 | """This searches 'buffer' for the first occurence of one of the search |
|
1690 | """This searches 'buffer' for the first occurence of one of the search | |
1691 | strings. 'freshlen' must indicate the number of bytes at the end of |
|
1691 | strings. 'freshlen' must indicate the number of bytes at the end of | |
1692 | 'buffer' which have not been searched before. It helps to avoid |
|
1692 | 'buffer' which have not been searched before. It helps to avoid | |
1693 | searching the same, possibly big, buffer over and over again. |
|
1693 | searching the same, possibly big, buffer over and over again. | |
1694 |
|
1694 | |||
1695 | See class spawn for the 'searchwindowsize' argument. |
|
1695 | See class spawn for the 'searchwindowsize' argument. | |
1696 |
|
1696 | |||
1697 | If there is a match this returns the index of that string, and sets |
|
1697 | If there is a match this returns the index of that string, and sets | |
1698 | 'start', 'end' and 'match'. Otherwise, this returns -1. """ |
|
1698 | 'start', 'end' and 'match'. Otherwise, this returns -1. """ | |
1699 |
|
1699 | |||
1700 | absurd_match = len(buffer) |
|
1700 | absurd_match = len(buffer) | |
1701 | first_match = absurd_match |
|
1701 | first_match = absurd_match | |
1702 |
|
1702 | |||
1703 | # 'freshlen' helps a lot here. Further optimizations could |
|
1703 | # 'freshlen' helps a lot here. Further optimizations could | |
1704 | # possibly include: |
|
1704 | # possibly include: | |
1705 | # |
|
1705 | # | |
1706 | # using something like the Boyer-Moore Fast String Searching |
|
1706 | # using something like the Boyer-Moore Fast String Searching | |
1707 | # Algorithm; pre-compiling the search through a list of |
|
1707 | # Algorithm; pre-compiling the search through a list of | |
1708 | # strings into something that can scan the input once to |
|
1708 | # strings into something that can scan the input once to | |
1709 | # search for all N strings; realize that if we search for |
|
1709 | # search for all N strings; realize that if we search for | |
1710 | # ['bar', 'baz'] and the input is '...foo' we need not bother |
|
1710 | # ['bar', 'baz'] and the input is '...foo' we need not bother | |
1711 | # rescanning until we've read three more bytes. |
|
1711 | # rescanning until we've read three more bytes. | |
1712 | # |
|
1712 | # | |
1713 | # Sadly, I don't know enough about this interesting topic. /grahn |
|
1713 | # Sadly, I don't know enough about this interesting topic. /grahn | |
1714 |
|
1714 | |||
1715 | for index, s in self._strings: |
|
1715 | for index, s in self._strings: | |
1716 | if searchwindowsize is None: |
|
1716 | if searchwindowsize is None: | |
1717 | # the match, if any, can only be in the fresh data, |
|
1717 | # the match, if any, can only be in the fresh data, | |
1718 | # or at the very end of the old data |
|
1718 | # or at the very end of the old data | |
1719 | offset = -(freshlen+len(s)) |
|
1719 | offset = -(freshlen+len(s)) | |
1720 | else: |
|
1720 | else: | |
1721 | # better obey searchwindowsize |
|
1721 | # better obey searchwindowsize | |
1722 | offset = -searchwindowsize |
|
1722 | offset = -searchwindowsize | |
1723 | n = buffer.find(s, offset) |
|
1723 | n = buffer.find(s, offset) | |
1724 | if n >= 0 and n < first_match: |
|
1724 | if n >= 0 and n < first_match: | |
1725 | first_match = n |
|
1725 | first_match = n | |
1726 | best_index, best_match = index, s |
|
1726 | best_index, best_match = index, s | |
1727 | if first_match == absurd_match: |
|
1727 | if first_match == absurd_match: | |
1728 | return -1 |
|
1728 | return -1 | |
1729 | self.match = best_match |
|
1729 | self.match = best_match | |
1730 | self.start = first_match |
|
1730 | self.start = first_match | |
1731 | self.end = self.start + len(self.match) |
|
1731 | self.end = self.start + len(self.match) | |
1732 | return best_index |
|
1732 | return best_index | |
1733 |
|
1733 | |||
1734 | class searcher_re (object): |
|
1734 | class searcher_re (object): | |
1735 |
|
1735 | |||
1736 | """This is regular expression string search helper for the |
|
1736 | """This is regular expression string search helper for the | |
1737 | spawn.expect_any() method. This helper class is for powerful |
|
1737 | spawn.expect_any() method. This helper class is for powerful | |
1738 | pattern matching. For speed, see the helper class, searcher_string. |
|
1738 | pattern matching. For speed, see the helper class, searcher_string. | |
1739 |
|
1739 | |||
1740 | Attributes: |
|
1740 | Attributes: | |
1741 |
|
1741 | |||
1742 | eof_index - index of EOF, or -1 |
|
1742 | eof_index - index of EOF, or -1 | |
1743 | timeout_index - index of TIMEOUT, or -1 |
|
1743 | timeout_index - index of TIMEOUT, or -1 | |
1744 |
|
1744 | |||
1745 | After a successful match by the search() method the following attributes |
|
1745 | After a successful match by the search() method the following attributes | |
1746 | are available: |
|
1746 | are available: | |
1747 |
|
1747 | |||
1748 | start - index into the buffer, first byte of match |
|
1748 | start - index into the buffer, first byte of match | |
1749 | end - index into the buffer, first byte after match |
|
1749 | end - index into the buffer, first byte after match | |
1750 | match - the re.match object returned by a succesful re.search |
|
1750 | match - the re.match object returned by a succesful re.search | |
1751 |
|
1751 | |||
1752 | """ |
|
1752 | """ | |
1753 |
|
1753 | |||
1754 | def __init__(self, patterns): |
|
1754 | def __init__(self, patterns): | |
1755 |
|
1755 | |||
1756 | """This creates an instance that searches for 'patterns' Where |
|
1756 | """This creates an instance that searches for 'patterns' Where | |
1757 | 'patterns' may be a list or other sequence of compiled regular |
|
1757 | 'patterns' may be a list or other sequence of compiled regular | |
1758 | expressions, or the EOF or TIMEOUT types.""" |
|
1758 | expressions, or the EOF or TIMEOUT types.""" | |
1759 |
|
1759 | |||
1760 | self.eof_index = -1 |
|
1760 | self.eof_index = -1 | |
1761 | self.timeout_index = -1 |
|
1761 | self.timeout_index = -1 | |
1762 | self._searches = [] |
|
1762 | self._searches = [] | |
1763 | for n, s in enumerate(patterns): |
|
1763 | for n, s in enumerate(patterns): | |
1764 | if s is EOF: |
|
1764 | if s is EOF: | |
1765 | self.eof_index = n |
|
1765 | self.eof_index = n | |
1766 | continue |
|
1766 | continue | |
1767 | if s is TIMEOUT: |
|
1767 | if s is TIMEOUT: | |
1768 | self.timeout_index = n |
|
1768 | self.timeout_index = n | |
1769 | continue |
|
1769 | continue | |
1770 | self._searches.append((n, s)) |
|
1770 | self._searches.append((n, s)) | |
1771 |
|
1771 | |||
1772 | def __str__(self): |
|
1772 | def __str__(self): | |
1773 |
|
1773 | |||
1774 | """This returns a human-readable string that represents the state of |
|
1774 | """This returns a human-readable string that represents the state of | |
1775 | the object.""" |
|
1775 | the object.""" | |
1776 |
|
1776 | |||
1777 | ss = [ (n,' %d: re.compile("%s")' % (n,str(s.pattern))) for n,s in self._searches] |
|
1777 | ss = [ (n,' %d: re.compile("%s")' % (n,str(s.pattern))) for n,s in self._searches] | |
1778 | ss.append((-1,'searcher_re:')) |
|
1778 | ss.append((-1,'searcher_re:')) | |
1779 | if self.eof_index >= 0: |
|
1779 | if self.eof_index >= 0: | |
1780 | ss.append ((self.eof_index,' %d: EOF' % self.eof_index)) |
|
1780 | ss.append ((self.eof_index,' %d: EOF' % self.eof_index)) | |
1781 | if self.timeout_index >= 0: |
|
1781 | if self.timeout_index >= 0: | |
1782 | ss.append ((self.timeout_index,' %d: TIMEOUT' % self.timeout_index)) |
|
1782 | ss.append ((self.timeout_index,' %d: TIMEOUT' % self.timeout_index)) | |
1783 | ss.sort() |
|
1783 | ss.sort() | |
1784 | return '\n'.join(a[1] for a in ss) |
|
1784 | return '\n'.join(a[1] for a in ss) | |
1785 |
|
1785 | |||
1786 | def search(self, buffer, freshlen, searchwindowsize=None): |
|
1786 | def search(self, buffer, freshlen, searchwindowsize=None): | |
1787 |
|
1787 | |||
1788 | """This searches 'buffer' for the first occurence of one of the regular |
|
1788 | """This searches 'buffer' for the first occurence of one of the regular | |
1789 | expressions. 'freshlen' must indicate the number of bytes at the end of |
|
1789 | expressions. 'freshlen' must indicate the number of bytes at the end of | |
1790 | 'buffer' which have not been searched before. |
|
1790 | 'buffer' which have not been searched before. | |
1791 |
|
1791 | |||
1792 | See class spawn for the 'searchwindowsize' argument. |
|
1792 | See class spawn for the 'searchwindowsize' argument. | |
1793 |
|
1793 | |||
1794 | If there is a match this returns the index of that string, and sets |
|
1794 | If there is a match this returns the index of that string, and sets | |
1795 | 'start', 'end' and 'match'. Otherwise, returns -1.""" |
|
1795 | 'start', 'end' and 'match'. Otherwise, returns -1.""" | |
1796 |
|
1796 | |||
1797 | absurd_match = len(buffer) |
|
1797 | absurd_match = len(buffer) | |
1798 | first_match = absurd_match |
|
1798 | first_match = absurd_match | |
1799 | # 'freshlen' doesn't help here -- we cannot predict the |
|
1799 | # 'freshlen' doesn't help here -- we cannot predict the | |
1800 | # length of a match, and the re module provides no help. |
|
1800 | # length of a match, and the re module provides no help. | |
1801 | if searchwindowsize is None: |
|
1801 | if searchwindowsize is None: | |
1802 | searchstart = 0 |
|
1802 | searchstart = 0 | |
1803 | else: |
|
1803 | else: | |
1804 | searchstart = max(0, len(buffer)-searchwindowsize) |
|
1804 | searchstart = max(0, len(buffer)-searchwindowsize) | |
1805 | for index, s in self._searches: |
|
1805 | for index, s in self._searches: | |
1806 | match = s.search(buffer, searchstart) |
|
1806 | match = s.search(buffer, searchstart) | |
1807 | if match is None: |
|
1807 | if match is None: | |
1808 | continue |
|
1808 | continue | |
1809 | n = match.start() |
|
1809 | n = match.start() | |
1810 | if n < first_match: |
|
1810 | if n < first_match: | |
1811 | first_match = n |
|
1811 | first_match = n | |
1812 | the_match = match |
|
1812 | the_match = match | |
1813 | best_index = index |
|
1813 | best_index = index | |
1814 | if first_match == absurd_match: |
|
1814 | if first_match == absurd_match: | |
1815 | return -1 |
|
1815 | return -1 | |
1816 | self.start = first_match |
|
1816 | self.start = first_match | |
1817 | self.match = the_match |
|
1817 | self.match = the_match | |
1818 | self.end = self.match.end() |
|
1818 | self.end = self.match.end() | |
1819 | return best_index |
|
1819 | return best_index | |
1820 |
|
1820 | |||
1821 | def which (filename): |
|
1821 | def which (filename): | |
1822 |
|
1822 | |||
1823 | """This takes a given filename; tries to find it in the environment path; |
|
1823 | """This takes a given filename; tries to find it in the environment path; | |
1824 | then checks if it is executable. This returns the full path to the filename |
|
1824 | then checks if it is executable. This returns the full path to the filename | |
1825 | if found and executable. Otherwise this returns None.""" |
|
1825 | if found and executable. Otherwise this returns None.""" | |
1826 |
|
1826 | |||
1827 | # Special case where filename already contains a path. |
|
1827 | # Special case where filename already contains a path. | |
1828 | if os.path.dirname(filename) != '': |
|
1828 | if os.path.dirname(filename) != '': | |
1829 | if os.access (filename, os.X_OK): |
|
1829 | if os.access (filename, os.X_OK): | |
1830 | return filename |
|
1830 | return filename | |
1831 |
|
1831 | |||
1832 | if not os.environ.has_key('PATH') or os.environ['PATH'] == '': |
|
1832 | if not os.environ.has_key('PATH') or os.environ['PATH'] == '': | |
1833 | p = os.defpath |
|
1833 | p = os.defpath | |
1834 | else: |
|
1834 | else: | |
1835 | p = os.environ['PATH'] |
|
1835 | p = os.environ['PATH'] | |
1836 |
|
1836 | |||
1837 | pathlist = p.split(os.pathsep) |
|
1837 | pathlist = p.split(os.pathsep) | |
1838 |
|
1838 | |||
1839 | for path in pathlist: |
|
1839 | for path in pathlist: | |
1840 | f = os.path.join(path, filename) |
|
1840 | f = os.path.join(path, filename) | |
1841 | if os.access(f, os.X_OK): |
|
1841 | if os.access(f, os.X_OK): | |
1842 | return f |
|
1842 | return f | |
1843 | return None |
|
1843 | return None | |
1844 |
|
1844 | |||
1845 | def split_command_line(command_line): |
|
1845 | def split_command_line(command_line): | |
1846 |
|
1846 | |||
1847 | """This splits a command line into a list of arguments. It splits arguments |
|
1847 | """This splits a command line into a list of arguments. It splits arguments | |
1848 | on spaces, but handles embedded quotes, doublequotes, and escaped |
|
1848 | on spaces, but handles embedded quotes, doublequotes, and escaped | |
1849 | characters. It's impossible to do this with a regular expression, so I |
|
1849 | characters. It's impossible to do this with a regular expression, so I | |
1850 | wrote a little state machine to parse the command line. """ |
|
1850 | wrote a little state machine to parse the command line. """ | |
1851 |
|
1851 | |||
1852 | arg_list = [] |
|
1852 | arg_list = [] | |
1853 | arg = '' |
|
1853 | arg = '' | |
1854 |
|
1854 | |||
1855 | # Constants to name the states we can be in. |
|
1855 | # Constants to name the states we can be in. | |
1856 | state_basic = 0 |
|
1856 | state_basic = 0 | |
1857 | state_esc = 1 |
|
1857 | state_esc = 1 | |
1858 | state_singlequote = 2 |
|
1858 | state_singlequote = 2 | |
1859 | state_doublequote = 3 |
|
1859 | state_doublequote = 3 | |
1860 | state_whitespace = 4 # The state of consuming whitespace between commands. |
|
1860 | state_whitespace = 4 # The state of consuming whitespace between commands. | |
1861 | state = state_basic |
|
1861 | state = state_basic | |
1862 |
|
1862 | |||
1863 | for c in command_line: |
|
1863 | for c in command_line: | |
1864 | if state == state_basic or state == state_whitespace: |
|
1864 | if state == state_basic or state == state_whitespace: | |
1865 | if c == '\\': # Escape the next character |
|
1865 | if c == '\\': # Escape the next character | |
1866 | state = state_esc |
|
1866 | state = state_esc | |
1867 | elif c == r"'": # Handle single quote |
|
1867 | elif c == r"'": # Handle single quote | |
1868 | state = state_singlequote |
|
1868 | state = state_singlequote | |
1869 | elif c == r'"': # Handle double quote |
|
1869 | elif c == r'"': # Handle double quote | |
1870 | state = state_doublequote |
|
1870 | state = state_doublequote | |
1871 | elif c.isspace(): |
|
1871 | elif c.isspace(): | |
1872 | # Add arg to arg_list if we aren't in the middle of whitespace. |
|
1872 | # Add arg to arg_list if we aren't in the middle of whitespace. | |
1873 | if state == state_whitespace: |
|
1873 | if state == state_whitespace: | |
1874 | None # Do nothing. |
|
1874 | None # Do nothing. | |
1875 | else: |
|
1875 | else: | |
1876 | arg_list.append(arg) |
|
1876 | arg_list.append(arg) | |
1877 | arg = '' |
|
1877 | arg = '' | |
1878 | state = state_whitespace |
|
1878 | state = state_whitespace | |
1879 | else: |
|
1879 | else: | |
1880 | arg = arg + c |
|
1880 | arg = arg + c | |
1881 | state = state_basic |
|
1881 | state = state_basic | |
1882 | elif state == state_esc: |
|
1882 | elif state == state_esc: | |
1883 | arg = arg + c |
|
1883 | arg = arg + c | |
1884 | state = state_basic |
|
1884 | state = state_basic | |
1885 | elif state == state_singlequote: |
|
1885 | elif state == state_singlequote: | |
1886 | if c == r"'": |
|
1886 | if c == r"'": | |
1887 | state = state_basic |
|
1887 | state = state_basic | |
1888 | else: |
|
1888 | else: | |
1889 | arg = arg + c |
|
1889 | arg = arg + c | |
1890 | elif state == state_doublequote: |
|
1890 | elif state == state_doublequote: | |
1891 | if c == r'"': |
|
1891 | if c == r'"': | |
1892 | state = state_basic |
|
1892 | state = state_basic | |
1893 | else: |
|
1893 | else: | |
1894 | arg = arg + c |
|
1894 | arg = arg + c | |
1895 |
|
1895 | |||
1896 | if arg != '': |
|
1896 | if arg != '': | |
1897 | arg_list.append(arg) |
|
1897 | arg_list.append(arg) | |
1898 | return arg_list |
|
1898 | return arg_list | |
1899 |
|
1899 | |||
1900 | # vi:set sr et ts=4 sw=4 ft=python : |
|
1900 | # vi:set sr et ts=4 sw=4 ft=python : |
@@ -1,194 +1,194 b'' | |||||
1 | """Posix-specific implementation of process utilities. |
|
1 | """Posix-specific implementation of process utilities. | |
2 |
|
2 | |||
3 | This file is only meant to be imported by process.py, not by end-users. |
|
3 | This file is only meant to be imported by process.py, not by end-users. | |
4 | """ |
|
4 | """ | |
5 |
|
5 | |||
6 | #----------------------------------------------------------------------------- |
|
6 | #----------------------------------------------------------------------------- | |
7 | # Copyright (C) 2010-2011 The IPython Development Team |
|
7 | # Copyright (C) 2010-2011 The IPython Development Team | |
8 | # |
|
8 | # | |
9 | # Distributed under the terms of the BSD License. The full license is in |
|
9 | # Distributed under the terms of the BSD License. The full license is in | |
10 | # the file COPYING, distributed as part of this software. |
|
10 | # the file COPYING, distributed as part of this software. | |
11 | #----------------------------------------------------------------------------- |
|
11 | #----------------------------------------------------------------------------- | |
12 |
|
12 | |||
13 | #----------------------------------------------------------------------------- |
|
13 | #----------------------------------------------------------------------------- | |
14 | # Imports |
|
14 | # Imports | |
15 | #----------------------------------------------------------------------------- |
|
15 | #----------------------------------------------------------------------------- | |
16 | from __future__ import print_function |
|
16 | from __future__ import print_function | |
17 |
|
17 | |||
18 | # Stdlib |
|
18 | # Stdlib | |
19 | import subprocess as sp |
|
19 | import subprocess as sp | |
20 | import sys |
|
20 | import sys | |
21 |
|
21 | |||
22 | from IPython.external import pexpect |
|
22 | from IPython.external import pexpect | |
23 |
|
23 | |||
24 | # Our own |
|
24 | # Our own | |
25 | from .autoattr import auto_attr |
|
25 | from .autoattr import auto_attr | |
26 | from ._process_common import getoutput |
|
26 | from ._process_common import getoutput | |
27 | from IPython.utils import text |
|
27 | from IPython.utils import text | |
28 | from IPython.utils import py3compat |
|
28 | from IPython.utils import py3compat | |
29 |
|
29 | |||
30 | #----------------------------------------------------------------------------- |
|
30 | #----------------------------------------------------------------------------- | |
31 | # Function definitions |
|
31 | # Function definitions | |
32 | #----------------------------------------------------------------------------- |
|
32 | #----------------------------------------------------------------------------- | |
33 |
|
33 | |||
34 | def _find_cmd(cmd): |
|
34 | def _find_cmd(cmd): | |
35 | """Find the full path to a command using which.""" |
|
35 | """Find the full path to a command using which.""" | |
36 |
|
36 | |||
37 | path = sp.Popen(['/usr/bin/env', 'which', cmd], |
|
37 | path = sp.Popen(['/usr/bin/env', 'which', cmd], | |
38 | stdout=sp.PIPE).communicate()[0] |
|
38 | stdout=sp.PIPE).communicate()[0] | |
39 | return py3compat.bytes_to_str(path) |
|
39 | return py3compat.bytes_to_str(path) | |
40 |
|
40 | |||
41 |
|
41 | |||
42 | class ProcessHandler(object): |
|
42 | class ProcessHandler(object): | |
43 | """Execute subprocesses under the control of pexpect. |
|
43 | """Execute subprocesses under the control of pexpect. | |
44 | """ |
|
44 | """ | |
45 | # Timeout in seconds to wait on each reading of the subprocess' output. |
|
45 | # Timeout in seconds to wait on each reading of the subprocess' output. | |
46 | # This should not be set too low to avoid cpu overusage from our side, |
|
46 | # This should not be set too low to avoid cpu overusage from our side, | |
47 | # since we read in a loop whose period is controlled by this timeout. |
|
47 | # since we read in a loop whose period is controlled by this timeout. | |
48 | read_timeout = 0.05 |
|
48 | read_timeout = 0.05 | |
49 |
|
49 | |||
50 | # Timeout to give a process if we receive SIGINT, between sending the |
|
50 | # Timeout to give a process if we receive SIGINT, between sending the | |
51 | # SIGINT to the process and forcefully terminating it. |
|
51 | # SIGINT to the process and forcefully terminating it. | |
52 | terminate_timeout = 0.2 |
|
52 | terminate_timeout = 0.2 | |
53 |
|
53 | |||
54 | # File object where stdout and stderr of the subprocess will be written |
|
54 | # File object where stdout and stderr of the subprocess will be written | |
55 | logfile = None |
|
55 | logfile = None | |
56 |
|
56 | |||
57 | # Shell to call for subprocesses to execute |
|
57 | # Shell to call for subprocesses to execute | |
58 | sh = None |
|
58 | sh = None | |
59 |
|
59 | |||
60 | @auto_attr |
|
60 | @auto_attr | |
61 | def sh(self): |
|
61 | def sh(self): | |
62 | sh = pexpect.which('sh') |
|
62 | sh = pexpect.which('sh') | |
63 | if sh is None: |
|
63 | if sh is None: | |
64 | raise OSError('"sh" shell not found') |
|
64 | raise OSError('"sh" shell not found') | |
65 | return sh |
|
65 | return sh | |
66 |
|
66 | |||
67 | def __init__(self, logfile=None, read_timeout=None, terminate_timeout=None): |
|
67 | def __init__(self, logfile=None, read_timeout=None, terminate_timeout=None): | |
68 | """Arguments are used for pexpect calls.""" |
|
68 | """Arguments are used for pexpect calls.""" | |
69 | self.read_timeout = (ProcessHandler.read_timeout if read_timeout is |
|
69 | self.read_timeout = (ProcessHandler.read_timeout if read_timeout is | |
70 | None else read_timeout) |
|
70 | None else read_timeout) | |
71 | self.terminate_timeout = (ProcessHandler.terminate_timeout if |
|
71 | self.terminate_timeout = (ProcessHandler.terminate_timeout if | |
72 | terminate_timeout is None else |
|
72 | terminate_timeout is None else | |
73 | terminate_timeout) |
|
73 | terminate_timeout) | |
74 | self.logfile = sys.stdout if logfile is None else logfile |
|
74 | self.logfile = sys.stdout if logfile is None else logfile | |
75 |
|
75 | |||
76 | def getoutput(self, cmd): |
|
76 | def getoutput(self, cmd): | |
77 | """Run a command and return its stdout/stderr as a string. |
|
77 | """Run a command and return its stdout/stderr as a string. | |
78 |
|
78 | |||
79 | Parameters |
|
79 | Parameters | |
80 | ---------- |
|
80 | ---------- | |
81 | cmd : str |
|
81 | cmd : str | |
82 | A command to be executed in the system shell. |
|
82 | A command to be executed in the system shell. | |
83 |
|
83 | |||
84 | Returns |
|
84 | Returns | |
85 | ------- |
|
85 | ------- | |
86 | output : str |
|
86 | output : str | |
87 | A string containing the combination of stdout and stderr from the |
|
87 | A string containing the combination of stdout and stderr from the | |
88 | subprocess, in whatever order the subprocess originally wrote to its |
|
88 | subprocess, in whatever order the subprocess originally wrote to its | |
89 | file descriptors (so the order of the information in this string is the |
|
89 | file descriptors (so the order of the information in this string is the | |
90 | correct order as would be seen if running the command in a terminal). |
|
90 | correct order as would be seen if running the command in a terminal). | |
91 | """ |
|
91 | """ | |
92 | try: |
|
92 | try: | |
93 | return pexpect.run(self.sh, args=['-c', cmd]).replace('\r\n', '\n') |
|
93 | return pexpect.run(self.sh, args=['-c', cmd]).replace('\r\n', '\n') | |
94 | except KeyboardInterrupt: |
|
94 | except KeyboardInterrupt: | |
95 | print('^C', file=sys.stderr, end='') |
|
95 | print('^C', file=sys.stderr, end='') | |
96 |
|
96 | |||
97 | def getoutput_pexpect(self, cmd): |
|
97 | def getoutput_pexpect(self, cmd): | |
98 | """Run a command and return its stdout/stderr as a string. |
|
98 | """Run a command and return its stdout/stderr as a string. | |
99 |
|
99 | |||
100 | Parameters |
|
100 | Parameters | |
101 | ---------- |
|
101 | ---------- | |
102 | cmd : str |
|
102 | cmd : str | |
103 | A command to be executed in the system shell. |
|
103 | A command to be executed in the system shell. | |
104 |
|
104 | |||
105 | Returns |
|
105 | Returns | |
106 | ------- |
|
106 | ------- | |
107 | output : str |
|
107 | output : str | |
108 | A string containing the combination of stdout and stderr from the |
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108 | A string containing the combination of stdout and stderr from the | |
109 | subprocess, in whatever order the subprocess originally wrote to its |
|
109 | subprocess, in whatever order the subprocess originally wrote to its | |
110 | file descriptors (so the order of the information in this string is the |
|
110 | file descriptors (so the order of the information in this string is the | |
111 | correct order as would be seen if running the command in a terminal). |
|
111 | correct order as would be seen if running the command in a terminal). | |
112 | """ |
|
112 | """ | |
113 | try: |
|
113 | try: | |
114 | return pexpect.run(self.sh, args=['-c', cmd]).replace('\r\n', '\n') |
|
114 | return pexpect.run(self.sh, args=['-c', cmd]).replace('\r\n', '\n') | |
115 | except KeyboardInterrupt: |
|
115 | except KeyboardInterrupt: | |
116 | print('^C', file=sys.stderr, end='') |
|
116 | print('^C', file=sys.stderr, end='') | |
117 |
|
117 | |||
118 | def system(self, cmd): |
|
118 | def system(self, cmd): | |
119 | """Execute a command in a subshell. |
|
119 | """Execute a command in a subshell. | |
120 |
|
120 | |||
121 | Parameters |
|
121 | Parameters | |
122 | ---------- |
|
122 | ---------- | |
123 | cmd : str |
|
123 | cmd : str | |
124 | A command to be executed in the system shell. |
|
124 | A command to be executed in the system shell. | |
125 |
|
125 | |||
126 | Returns |
|
126 | Returns | |
127 | ------- |
|
127 | ------- | |
128 | int : child's exitstatus |
|
128 | int : child's exitstatus | |
129 | """ |
|
129 | """ | |
130 | # Get likely encoding for the output. |
|
130 | # Get likely encoding for the output. | |
131 | enc = text.getdefaultencoding() |
|
131 | enc = text.getdefaultencoding() | |
132 |
|
132 | |||
133 | # Patterns to match on the output, for pexpect. We read input and |
|
133 | # Patterns to match on the output, for pexpect. We read input and | |
134 | # allow either a short timeout or EOF |
|
134 | # allow either a short timeout or EOF | |
135 | patterns = [pexpect.TIMEOUT, pexpect.EOF] |
|
135 | patterns = [pexpect.TIMEOUT, pexpect.EOF] | |
136 | # the index of the EOF pattern in the list. |
|
136 | # the index of the EOF pattern in the list. | |
137 | # even though we know it's 1, this call means we don't have to worry if |
|
137 | # even though we know it's 1, this call means we don't have to worry if | |
138 | # we change the above list, and forget to change this value: |
|
138 | # we change the above list, and forget to change this value: | |
139 | EOF_index = patterns.index(pexpect.EOF) |
|
139 | EOF_index = patterns.index(pexpect.EOF) | |
140 | # The size of the output stored so far in the process output buffer. |
|
140 | # The size of the output stored so far in the process output buffer. | |
141 | # Since pexpect only appends to this buffer, each time we print we |
|
141 | # Since pexpect only appends to this buffer, each time we print we | |
142 | # record how far we've printed, so that next time we only print *new* |
|
142 | # record how far we've printed, so that next time we only print *new* | |
143 | # content from the buffer. |
|
143 | # content from the buffer. | |
144 | out_size = 0 |
|
144 | out_size = 0 | |
145 | try: |
|
145 | try: | |
146 | # Since we're not really searching the buffer for text patterns, we |
|
146 | # Since we're not really searching the buffer for text patterns, we | |
147 | # can set pexpect's search window to be tiny and it won't matter. |
|
147 | # can set pexpect's search window to be tiny and it won't matter. | |
148 | # We only search for the 'patterns' timeout or EOF, which aren't in |
|
148 | # We only search for the 'patterns' timeout or EOF, which aren't in | |
149 | # the text itself. |
|
149 | # the text itself. | |
150 | #child = pexpect.spawn(pcmd, searchwindowsize=1) |
|
150 | #child = pexpect.spawn(pcmd, searchwindowsize=1) | |
151 | try: |
|
151 | if hasattr(pexpect, 'spawnb'): | |
152 |
child = pexpect.spawn(self.sh, args=['-c', cmd] |
|
152 | child = pexpect.spawnb(self.sh, args=['-c', cmd]) # Pexpect-U | |
153 |
e |
|
153 | else: | |
154 |
child = pexpect.spawn(self.sh, args=['-c', cmd]) |
|
154 | child = pexpect.spawn(self.sh, args=['-c', cmd]) # Vanilla Pexpect | |
155 | flush = sys.stdout.flush |
|
155 | flush = sys.stdout.flush | |
156 | while True: |
|
156 | while True: | |
157 | # res is the index of the pattern that caused the match, so we |
|
157 | # res is the index of the pattern that caused the match, so we | |
158 | # know whether we've finished (if we matched EOF) or not |
|
158 | # know whether we've finished (if we matched EOF) or not | |
159 | res_idx = child.expect_list(patterns, self.read_timeout) |
|
159 | res_idx = child.expect_list(patterns, self.read_timeout) | |
160 |
print |
|
160 | print(child.before[out_size:].decode(enc, 'replace'), end='') | |
161 | flush() |
|
161 | flush() | |
162 | if res_idx==EOF_index: |
|
162 | if res_idx==EOF_index: | |
163 | break |
|
163 | break | |
164 | # Update the pointer to what we've already printed |
|
164 | # Update the pointer to what we've already printed | |
165 | out_size = len(child.before) |
|
165 | out_size = len(child.before) | |
166 | except KeyboardInterrupt: |
|
166 | except KeyboardInterrupt: | |
167 | # We need to send ^C to the process. The ascii code for '^C' is 3 |
|
167 | # We need to send ^C to the process. The ascii code for '^C' is 3 | |
168 | # (the character is known as ETX for 'End of Text', see |
|
168 | # (the character is known as ETX for 'End of Text', see | |
169 | # curses.ascii.ETX). |
|
169 | # curses.ascii.ETX). | |
170 | child.sendline(chr(3)) |
|
170 | child.sendline(chr(3)) | |
171 | # Read and print any more output the program might produce on its |
|
171 | # Read and print any more output the program might produce on its | |
172 | # way out. |
|
172 | # way out. | |
173 | try: |
|
173 | try: | |
174 | out_size = len(child.before) |
|
174 | out_size = len(child.before) | |
175 | child.expect_list(patterns, self.terminate_timeout) |
|
175 | child.expect_list(patterns, self.terminate_timeout) | |
176 |
print |
|
176 | print(child.before[out_size:].decode(enc, 'replace'), end='') | |
177 | sys.stdout.flush() |
|
177 | sys.stdout.flush() | |
178 | except KeyboardInterrupt: |
|
178 | except KeyboardInterrupt: | |
179 | # Impatient users tend to type it multiple times |
|
179 | # Impatient users tend to type it multiple times | |
180 | pass |
|
180 | pass | |
181 | finally: |
|
181 | finally: | |
182 | # Ensure the subprocess really is terminated |
|
182 | # Ensure the subprocess really is terminated | |
183 | child.terminate(force=True) |
|
183 | child.terminate(force=True) | |
184 | # add isalive check, to ensure exitstatus is set: |
|
184 | # add isalive check, to ensure exitstatus is set: | |
185 | child.isalive() |
|
185 | child.isalive() | |
186 | return child.exitstatus |
|
186 | return child.exitstatus | |
187 |
|
187 | |||
188 |
|
188 | |||
189 | # Make system() with a functional interface for outside use. Note that we use |
|
189 | # Make system() with a functional interface for outside use. Note that we use | |
190 | # getoutput() from the _common utils, which is built on top of popen(). Using |
|
190 | # getoutput() from the _common utils, which is built on top of popen(). Using | |
191 | # pexpect to get subprocess output produces difficult to parse output, since |
|
191 | # pexpect to get subprocess output produces difficult to parse output, since | |
192 | # programs think they are talking to a tty and produce highly formatted output |
|
192 | # programs think they are talking to a tty and produce highly formatted output | |
193 | # (ls is a good example) that makes them hard. |
|
193 | # (ls is a good example) that makes them hard. | |
194 | system = ProcessHandler().system |
|
194 | system = ProcessHandler().system |
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