mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-04 10:23:37 +00:00
cec4ed573d
Switched out sqlite3 libs in favour of SQLAlchemy v0.9, will gradually migrate dialects and scheme to be fully SQLAlchemy compliant for using there ORM with sessions instead of direct. Fixed getEpisode function to stop making unrequired scene number conversions on already converted data thats available now from cache.
1544 lines
55 KiB
Python
1544 lines
55 KiB
Python
# subprocess - Subprocesses with accessible I/O streams
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#
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# For more information about this module, see PEP 324.
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#
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# This module should remain compatible with Python 2.2, see PEP 291.
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#
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# Copyright (c) 2003-2005 by Peter Astrand <astrand@lysator.liu.se>
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#
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# Licensed to PSF under a Contributor Agreement.
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# See http://www.python.org/2.4/license for licensing details.
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r"""subprocess - Subprocesses with accessible I/O streams
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This module allows you to spawn processes, connect to their
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input/output/error pipes, and obtain their return codes. This module
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intends to replace several other, older modules and functions, like:
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os.system
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os.spawn*
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os.popen*
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popen2.*
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commands.*
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Information about how the subprocess module can be used to replace these
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modules and functions can be found below.
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Using the subprocess module
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===========================
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This module defines one class called Popen:
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class Popen(args, bufsize=0, executable=None,
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stdin=None, stdout=None, stderr=None,
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preexec_fn=None, close_fds=False, shell=False,
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cwd=None, env=None, universal_newlines=False,
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startupinfo=None, creationflags=0):
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Arguments are:
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args should be a string, or a sequence of program arguments. The
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program to execute is normally the first item in the args sequence or
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string, but can be explicitly set by using the executable argument.
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On UNIX, with shell=False (default): In this case, the Popen class
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uses os.execvp() to execute the child program. args should normally
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be a sequence. A string will be treated as a sequence with the string
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as the only item (the program to execute).
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On UNIX, with shell=True: If args is a string, it specifies the
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command string to execute through the shell. If args is a sequence,
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the first item specifies the command string, and any additional items
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will be treated as additional shell arguments.
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On Windows: the Popen class uses CreateProcess() to execute the child
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program, which operates on strings. If args is a sequence, it will be
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converted to a string using the list2cmdline method. Please note that
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not all MS Windows applications interpret the command line the same
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way: The list2cmdline is designed for applications using the same
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rules as the MS C runtime.
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bufsize, if given, has the same meaning as the corresponding argument
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to the built-in open() function: 0 means unbuffered, 1 means line
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buffered, any other positive value means use a buffer of
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(approximately) that size. A negative bufsize means to use the system
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default, which usually means fully buffered. The default value for
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bufsize is 0 (unbuffered).
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stdin, stdout and stderr specify the executed programs' standard
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input, standard output and standard error file handles, respectively.
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Valid values are PIPE, an existing file descriptor (a positive
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integer), an existing file object, and None. PIPE indicates that a
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new pipe to the child should be created. With None, no redirection
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will occur; the child's file handles will be inherited from the
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parent. Additionally, stderr can be STDOUT, which indicates that the
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stderr data from the applications should be captured into the same
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file handle as for stdout.
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If preexec_fn is set to a callable object, this object will be called
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in the child process just before the child is executed.
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If close_fds is true, all file descriptors except 0, 1 and 2 will be
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closed before the child process is executed.
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if shell is true, the specified command will be executed through the
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shell.
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If cwd is not None, the current directory will be changed to cwd
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before the child is executed.
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If env is not None, it defines the environment variables for the new
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process.
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If universal_newlines is true, the file objects stdout and stderr are
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opened as a text files, but lines may be terminated by any of '\n',
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the Unix end-of-line convention, '\r', the Macintosh convention or
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'\r\n', the Windows convention. All of these external representations
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are seen as '\n' by the Python program. Note: This feature is only
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available if Python is built with universal newline support (the
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default). Also, the newlines attribute of the file objects stdout,
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stdin and stderr are not updated by the communicate() method.
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The startupinfo and creationflags, if given, will be passed to the
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underlying CreateProcess() function. They can specify things such as
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appearance of the main window and priority for the new process.
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(Windows only)
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This module also defines some shortcut functions:
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call(*popenargs, **kwargs):
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Run command with arguments. Wait for command to complete, then
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return the returncode attribute.
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The arguments are the same as for the Popen constructor. Example:
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retcode = call(["ls", "-l"])
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check_call(*popenargs, **kwargs):
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Run command with arguments. Wait for command to complete. If the
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exit code was zero then return, otherwise raise
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CalledProcessError. The CalledProcessError object will have the
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return code in the returncode attribute.
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The arguments are the same as for the Popen constructor. Example:
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check_call(["ls", "-l"])
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check_output(*popenargs, **kwargs):
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Run command with arguments and return its output as a byte string.
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If the exit code was non-zero it raises a CalledProcessError. The
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CalledProcessError object will have the return code in the returncode
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attribute and output in the output attribute.
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The arguments are the same as for the Popen constructor. Example:
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output = check_output(["ls", "-l", "/dev/null"])
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Exceptions
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----------
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Exceptions raised in the child process, before the new program has
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started to execute, will be re-raised in the parent. Additionally,
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the exception object will have one extra attribute called
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'child_traceback', which is a string containing traceback information
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from the childs point of view.
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The most common exception raised is OSError. This occurs, for
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example, when trying to execute a non-existent file. Applications
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should prepare for OSErrors.
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A ValueError will be raised if Popen is called with invalid arguments.
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check_call() and check_output() will raise CalledProcessError, if the
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called process returns a non-zero return code.
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Security
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--------
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Unlike some other popen functions, this implementation will never call
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/bin/sh implicitly. This means that all characters, including shell
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metacharacters, can safely be passed to child processes.
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Popen objects
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=============
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Instances of the Popen class have the following methods:
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poll()
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Check if child process has terminated. Returns returncode
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attribute.
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wait()
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Wait for child process to terminate. Returns returncode attribute.
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communicate(input=None)
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Interact with process: Send data to stdin. Read data from stdout
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and stderr, until end-of-file is reached. Wait for process to
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terminate. The optional input argument should be a string to be
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sent to the child process, or None, if no data should be sent to
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the child.
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communicate() returns a tuple (stdout, stderr).
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Note: The data read is buffered in memory, so do not use this
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method if the data size is large or unlimited.
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The following attributes are also available:
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stdin
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If the stdin argument is PIPE, this attribute is a file object
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that provides input to the child process. Otherwise, it is None.
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stdout
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If the stdout argument is PIPE, this attribute is a file object
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that provides output from the child process. Otherwise, it is
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None.
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stderr
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If the stderr argument is PIPE, this attribute is file object that
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provides error output from the child process. Otherwise, it is
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None.
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pid
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The process ID of the child process.
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returncode
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The child return code. A None value indicates that the process
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hasn't terminated yet. A negative value -N indicates that the
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child was terminated by signal N (UNIX only).
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Replacing older functions with the subprocess module
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====================================================
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In this section, "a ==> b" means that b can be used as a replacement
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for a.
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Note: All functions in this section fail (more or less) silently if
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the executed program cannot be found; this module raises an OSError
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exception.
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In the following examples, we assume that the subprocess module is
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imported with "from subprocess import *".
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Replacing /bin/sh shell backquote
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---------------------------------
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output=`mycmd myarg`
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==>
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output = Popen(["mycmd", "myarg"], stdout=PIPE).communicate()[0]
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Replacing shell pipe line
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-------------------------
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output=`dmesg | grep hda`
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==>
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p1 = Popen(["dmesg"], stdout=PIPE)
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p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
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output = p2.communicate()[0]
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Replacing os.system()
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---------------------
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sts = os.system("mycmd" + " myarg")
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==>
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p = Popen("mycmd" + " myarg", shell=True)
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pid, sts = os.waitpid(p.pid, 0)
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Note:
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* Calling the program through the shell is usually not required.
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* It's easier to look at the returncode attribute than the
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exitstatus.
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A more real-world example would look like this:
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try:
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retcode = call("mycmd" + " myarg", shell=True)
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if retcode < 0:
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print >>sys.stderr, "Child was terminated by signal", -retcode
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else:
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print >>sys.stderr, "Child returned", retcode
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except OSError, e:
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print >>sys.stderr, "Execution failed:", e
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Replacing os.spawn*
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-------------------
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P_NOWAIT example:
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pid = os.spawnlp(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg")
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==>
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pid = Popen(["/bin/mycmd", "myarg"]).pid
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P_WAIT example:
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retcode = os.spawnlp(os.P_WAIT, "/bin/mycmd", "mycmd", "myarg")
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==>
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retcode = call(["/bin/mycmd", "myarg"])
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Vector example:
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os.spawnvp(os.P_NOWAIT, path, args)
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==>
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Popen([path] + args[1:])
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Environment example:
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os.spawnlpe(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg", env)
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==>
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Popen(["/bin/mycmd", "myarg"], env={"PATH": "/usr/bin"})
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Replacing os.popen*
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-------------------
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pipe = os.popen("cmd", mode='r', bufsize)
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==>
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pipe = Popen("cmd", shell=True, bufsize=bufsize, stdout=PIPE).stdout
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pipe = os.popen("cmd", mode='w', bufsize)
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==>
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pipe = Popen("cmd", shell=True, bufsize=bufsize, stdin=PIPE).stdin
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(child_stdin, child_stdout) = os.popen2("cmd", mode, bufsize)
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==>
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p = Popen("cmd", shell=True, bufsize=bufsize,
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stdin=PIPE, stdout=PIPE, close_fds=True)
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(child_stdin, child_stdout) = (p.stdin, p.stdout)
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(child_stdin,
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child_stdout,
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child_stderr) = os.popen3("cmd", mode, bufsize)
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==>
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p = Popen("cmd", shell=True, bufsize=bufsize,
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stdin=PIPE, stdout=PIPE, stderr=PIPE, close_fds=True)
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(child_stdin,
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child_stdout,
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child_stderr) = (p.stdin, p.stdout, p.stderr)
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(child_stdin, child_stdout_and_stderr) = os.popen4("cmd", mode,
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bufsize)
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==>
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p = Popen("cmd", shell=True, bufsize=bufsize,
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stdin=PIPE, stdout=PIPE, stderr=STDOUT, close_fds=True)
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(child_stdin, child_stdout_and_stderr) = (p.stdin, p.stdout)
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On Unix, os.popen2, os.popen3 and os.popen4 also accept a sequence as
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the command to execute, in which case arguments will be passed
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directly to the program without shell intervention. This usage can be
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replaced as follows:
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(child_stdin, child_stdout) = os.popen2(["/bin/ls", "-l"], mode,
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bufsize)
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==>
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p = Popen(["/bin/ls", "-l"], bufsize=bufsize, stdin=PIPE, stdout=PIPE)
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(child_stdin, child_stdout) = (p.stdin, p.stdout)
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Return code handling translates as follows:
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pipe = os.popen("cmd", 'w')
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...
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rc = pipe.close()
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if rc is not None and rc % 256:
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print "There were some errors"
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==>
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process = Popen("cmd", 'w', shell=True, stdin=PIPE)
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...
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process.stdin.close()
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if process.wait() != 0:
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print "There were some errors"
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Replacing popen2.*
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------------------
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(child_stdout, child_stdin) = popen2.popen2("somestring", bufsize, mode)
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==>
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p = Popen(["somestring"], shell=True, bufsize=bufsize
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stdin=PIPE, stdout=PIPE, close_fds=True)
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(child_stdout, child_stdin) = (p.stdout, p.stdin)
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On Unix, popen2 also accepts a sequence as the command to execute, in
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which case arguments will be passed directly to the program without
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shell intervention. This usage can be replaced as follows:
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(child_stdout, child_stdin) = popen2.popen2(["mycmd", "myarg"], bufsize,
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mode)
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==>
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p = Popen(["mycmd", "myarg"], bufsize=bufsize,
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stdin=PIPE, stdout=PIPE, close_fds=True)
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(child_stdout, child_stdin) = (p.stdout, p.stdin)
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The popen2.Popen3 and popen2.Popen4 basically works as subprocess.Popen,
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except that:
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* subprocess.Popen raises an exception if the execution fails
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* the capturestderr argument is replaced with the stderr argument.
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* stdin=PIPE and stdout=PIPE must be specified.
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* popen2 closes all filedescriptors by default, but you have to specify
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close_fds=True with subprocess.Popen.
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"""
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import sys
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mswindows = (sys.platform == "win32")
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import os
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import types
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import traceback
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import gc
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import signal
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import errno
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try:
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set
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except NameError:
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from sets import Set as set
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# Exception classes used by this module.
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class CalledProcessError(Exception):
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"""This exception is raised when a process run by check_call() or
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check_output() returns a non-zero exit status.
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The exit status will be stored in the returncode attribute;
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check_output() will also store the output in the output attribute.
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"""
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def __init__(self, returncode, cmd, output=None):
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self.returncode = returncode
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self.cmd = cmd
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self.output = output
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def __str__(self):
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return "Command '%s' returned non-zero exit status %d" % (
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self.cmd, self.returncode)
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if mswindows:
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import threading
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import msvcrt
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import _subprocess
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class STARTUPINFO:
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dwFlags = 0
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hStdInput = None
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hStdOutput = None
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hStdError = None
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wShowWindow = 0
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class pywintypes:
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error = IOError
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else:
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import select
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_has_poll = hasattr(select, 'poll')
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import fcntl
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import pickle
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# When select or poll has indicated that the file is writable,
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# we can write up to _PIPE_BUF bytes without risk of blocking.
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# POSIX defines PIPE_BUF as >= 512.
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_PIPE_BUF = getattr(select, 'PIPE_BUF', 512)
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__all__ = ["Popen", "PIPE", "STDOUT", "call", "check_call",
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"check_output", "CalledProcessError"]
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if mswindows:
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from _subprocess import CREATE_NEW_CONSOLE, CREATE_NEW_PROCESS_GROUP, \
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STD_INPUT_HANDLE, STD_OUTPUT_HANDLE, \
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STD_ERROR_HANDLE, SW_HIDE, \
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STARTF_USESTDHANDLES, STARTF_USESHOWWINDOW
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__all__.extend(["CREATE_NEW_CONSOLE", "CREATE_NEW_PROCESS_GROUP",
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"STD_INPUT_HANDLE", "STD_OUTPUT_HANDLE",
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"STD_ERROR_HANDLE", "SW_HIDE",
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"STARTF_USESTDHANDLES", "STARTF_USESHOWWINDOW"])
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try:
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MAXFD = os.sysconf("SC_OPEN_MAX")
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except:
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MAXFD = 256
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_active = []
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def _cleanup():
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for inst in _active[:]:
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res = inst._internal_poll(_deadstate=sys.maxint)
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if res is not None:
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try:
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_active.remove(inst)
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except ValueError:
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# This can happen if two threads create a new Popen instance.
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# It's harmless that it was already removed, so ignore.
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pass
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PIPE = -1
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STDOUT = -2
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def _eintr_retry_call(func, *args):
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while True:
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try:
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return func(*args)
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except (OSError, IOError), e:
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if e.errno == errno.EINTR:
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continue
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raise
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def call(*popenargs, **kwargs):
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"""Run command with arguments. Wait for command to complete, then
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return the returncode attribute.
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The arguments are the same as for the Popen constructor. Example:
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retcode = call(["ls", "-l"])
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"""
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return Popen(*popenargs, **kwargs).wait()
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def check_call(*popenargs, **kwargs):
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"""Run command with arguments. Wait for command to complete. If
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the exit code was zero then return, otherwise raise
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CalledProcessError. The CalledProcessError object will have the
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return code in the returncode attribute.
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The arguments are the same as for the Popen constructor. Example:
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check_call(["ls", "-l"])
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"""
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retcode = call(*popenargs, **kwargs)
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if retcode:
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cmd = kwargs.get("args")
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if cmd is None:
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cmd = popenargs[0]
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raise CalledProcessError(retcode, cmd)
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return 0
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def check_output(*popenargs, **kwargs):
|
|
r"""Run command with arguments and return its output as a byte string.
|
|
|
|
If the exit code was non-zero it raises a CalledProcessError. The
|
|
CalledProcessError object will have the return code in the returncode
|
|
attribute and output in the output attribute.
|
|
|
|
The arguments are the same as for the Popen constructor. Example:
|
|
|
|
>>> check_output(["ls", "-l", "/dev/null"])
|
|
'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
|
|
|
|
The stdout argument is not allowed as it is used internally.
|
|
To capture standard error in the result, use stderr=STDOUT.
|
|
|
|
>>> check_output(["/bin/sh", "-c",
|
|
... "ls -l non_existent_file ; exit 0"],
|
|
... stderr=STDOUT)
|
|
'ls: non_existent_file: No such file or directory\n'
|
|
"""
|
|
if 'stdout' in kwargs:
|
|
raise ValueError('stdout argument not allowed, it will be overridden.')
|
|
process = Popen(stdout=PIPE, *popenargs, **kwargs)
|
|
output, unused_err = process.communicate()
|
|
retcode = process.poll()
|
|
if retcode:
|
|
cmd = kwargs.get("args")
|
|
if cmd is None:
|
|
cmd = popenargs[0]
|
|
raise CalledProcessError(retcode, cmd, output=output)
|
|
return output
|
|
|
|
|
|
def list2cmdline(seq):
|
|
"""
|
|
Translate a sequence of arguments into a command line
|
|
string, using the same rules as the MS C runtime:
|
|
|
|
1) Arguments are delimited by white space, which is either a
|
|
space or a tab.
|
|
|
|
2) A string surrounded by double quotation marks is
|
|
interpreted as a single argument, regardless of white space
|
|
contained within. A quoted string can be embedded in an
|
|
argument.
|
|
|
|
3) A double quotation mark preceded by a backslash is
|
|
interpreted as a literal double quotation mark.
|
|
|
|
4) Backslashes are interpreted literally, unless they
|
|
immediately precede a double quotation mark.
|
|
|
|
5) If backslashes immediately precede a double quotation mark,
|
|
every pair of backslashes is interpreted as a literal
|
|
backslash. If the number of backslashes is odd, the last
|
|
backslash escapes the next double quotation mark as
|
|
described in rule 3.
|
|
"""
|
|
|
|
# See
|
|
# http://msdn.microsoft.com/en-us/library/17w5ykft.aspx
|
|
# or search http://msdn.microsoft.com for
|
|
# "Parsing C++ Command-Line Arguments"
|
|
result = []
|
|
needquote = False
|
|
for arg in seq:
|
|
bs_buf = []
|
|
|
|
# Add a space to separate this argument from the others
|
|
if result:
|
|
result.append(' ')
|
|
|
|
needquote = (" " in arg) or ("\t" in arg) or not arg
|
|
if needquote:
|
|
result.append('"')
|
|
|
|
for c in arg:
|
|
if c == '\\':
|
|
# Don't know if we need to double yet.
|
|
bs_buf.append(c)
|
|
elif c == '"':
|
|
# Double backslashes.
|
|
result.append('\\' * len(bs_buf) * 2)
|
|
bs_buf = []
|
|
result.append('\\"')
|
|
else:
|
|
# Normal char
|
|
if bs_buf:
|
|
result.extend(bs_buf)
|
|
bs_buf = []
|
|
result.append(c)
|
|
|
|
# Add remaining backslashes, if any.
|
|
if bs_buf:
|
|
result.extend(bs_buf)
|
|
|
|
if needquote:
|
|
result.extend(bs_buf)
|
|
result.append('"')
|
|
|
|
return ''.join(result)
|
|
|
|
|
|
class Popen(object):
|
|
|
|
def __init__(self, args, bufsize=0, executable=None,
|
|
stdin=None, stdout=None, stderr=None,
|
|
preexec_fn=None, close_fds=False, shell=False,
|
|
cwd=None, env=None, universal_newlines=False,
|
|
startupinfo=None, creationflags=0):
|
|
"""Create new Popen instance."""
|
|
_cleanup()
|
|
|
|
self._child_created = False
|
|
if not isinstance(bufsize, (int, long)):
|
|
raise TypeError("bufsize must be an integer")
|
|
|
|
if mswindows:
|
|
if preexec_fn is not None:
|
|
raise ValueError("preexec_fn is not supported on Windows "
|
|
"platforms")
|
|
if close_fds and (stdin is not None or stdout is not None or
|
|
stderr is not None):
|
|
raise ValueError("close_fds is not supported on Windows "
|
|
"platforms if you redirect "
|
|
"stdin/stdout/stderr")
|
|
else:
|
|
# POSIX
|
|
if startupinfo is not None:
|
|
raise ValueError("startupinfo is only supported on Windows "
|
|
"platforms")
|
|
if creationflags != 0:
|
|
raise ValueError("creationflags is only supported on Windows "
|
|
"platforms")
|
|
|
|
self.stdin = None
|
|
self.stdout = None
|
|
self.stderr = None
|
|
self.pid = None
|
|
self.returncode = None
|
|
self.universal_newlines = universal_newlines
|
|
|
|
# Input and output objects. The general principle is like
|
|
# this:
|
|
#
|
|
# Parent Child
|
|
# ------ -----
|
|
# p2cwrite ---stdin---> p2cread
|
|
# c2pread <--stdout--- c2pwrite
|
|
# errread <--stderr--- errwrite
|
|
#
|
|
# On POSIX, the child objects are file descriptors. On
|
|
# Windows, these are Windows file handles. The parent objects
|
|
# are file descriptors on both platforms. The parent objects
|
|
# are None when not using PIPEs. The child objects are None
|
|
# when not redirecting.
|
|
|
|
(p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite) = self._get_handles(stdin, stdout, stderr)
|
|
|
|
self._execute_child(args, executable, preexec_fn, close_fds,
|
|
cwd, env, universal_newlines,
|
|
startupinfo, creationflags, shell,
|
|
p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite)
|
|
|
|
if mswindows:
|
|
if p2cwrite is not None:
|
|
p2cwrite = msvcrt.open_osfhandle(p2cwrite.Detach(), 0)
|
|
if c2pread is not None:
|
|
c2pread = msvcrt.open_osfhandle(c2pread.Detach(), 0)
|
|
if errread is not None:
|
|
errread = msvcrt.open_osfhandle(errread.Detach(), 0)
|
|
|
|
if p2cwrite is not None:
|
|
self.stdin = os.fdopen(p2cwrite, 'wb', bufsize)
|
|
if c2pread is not None:
|
|
if universal_newlines:
|
|
self.stdout = os.fdopen(c2pread, 'rU', bufsize)
|
|
else:
|
|
self.stdout = os.fdopen(c2pread, 'rb', bufsize)
|
|
if errread is not None:
|
|
if universal_newlines:
|
|
self.stderr = os.fdopen(errread, 'rU', bufsize)
|
|
else:
|
|
self.stderr = os.fdopen(errread, 'rb', bufsize)
|
|
|
|
def _translate_newlines(self, data):
|
|
data = data.replace("\r\n", "\n")
|
|
data = data.replace("\r", "\n")
|
|
return data
|
|
|
|
def __del__(self, _maxint=sys.maxint, _active=_active):
|
|
# If __init__ hasn't had a chance to execute (e.g. if it
|
|
# was passed an undeclared keyword argument), we don't
|
|
# have a _child_created attribute at all.
|
|
if not getattr(self, '_child_created', False):
|
|
# We didn't get to successfully create a child process.
|
|
return
|
|
# In case the child hasn't been waited on, check if it's done.
|
|
self._internal_poll(_deadstate=_maxint)
|
|
if self.returncode is None and _active is not None:
|
|
# Child is still running, keep us alive until we can wait on it.
|
|
_active.append(self)
|
|
|
|
def communicate(self, input=None):
|
|
"""Interact with process: Send data to stdin. Read data from
|
|
stdout and stderr, until end-of-file is reached. Wait for
|
|
process to terminate. The optional input argument should be a
|
|
string to be sent to the child process, or None, if no data
|
|
should be sent to the child.
|
|
|
|
communicate() returns a tuple (stdout, stderr)."""
|
|
|
|
# Optimization: If we are only using one pipe, or no pipe at
|
|
# all, using select() or threads is unnecessary.
|
|
if [self.stdin, self.stdout, self.stderr].count(None) >= 2:
|
|
stdout = None
|
|
stderr = None
|
|
if self.stdin:
|
|
if input:
|
|
try:
|
|
self.stdin.write(input)
|
|
except IOError, e:
|
|
if e.errno != errno.EPIPE and e.errno != errno.EINVAL:
|
|
raise
|
|
self.stdin.close()
|
|
elif self.stdout:
|
|
stdout = _eintr_retry_call(self.stdout.read)
|
|
self.stdout.close()
|
|
elif self.stderr:
|
|
stderr = _eintr_retry_call(self.stderr.read)
|
|
self.stderr.close()
|
|
self.wait()
|
|
return (stdout, stderr)
|
|
|
|
return self._communicate(input)
|
|
|
|
def poll(self):
|
|
return self._internal_poll()
|
|
|
|
if mswindows:
|
|
#
|
|
# Windows methods
|
|
#
|
|
def _get_handles(self, stdin, stdout, stderr):
|
|
"""Construct and return tuple with IO objects:
|
|
p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite
|
|
"""
|
|
if stdin is None and stdout is None and stderr is None:
|
|
return (None, None, None, None, None, None)
|
|
|
|
p2cread, p2cwrite = None, None
|
|
c2pread, c2pwrite = None, None
|
|
errread, errwrite = None, None
|
|
|
|
if stdin is None:
|
|
p2cread = _subprocess.GetStdHandle(
|
|
_subprocess.STD_INPUT_HANDLE)
|
|
if p2cread is None:
|
|
p2cread, _ = _subprocess.CreatePipe(None, 0)
|
|
elif stdin == PIPE:
|
|
p2cread, p2cwrite = _subprocess.CreatePipe(None, 0)
|
|
elif isinstance(stdin, int):
|
|
p2cread = msvcrt.get_osfhandle(stdin)
|
|
else:
|
|
# Assuming file-like object
|
|
p2cread = msvcrt.get_osfhandle(stdin.fileno())
|
|
p2cread = self._make_inheritable(p2cread)
|
|
|
|
if stdout is None:
|
|
c2pwrite = _subprocess.GetStdHandle(
|
|
_subprocess.STD_OUTPUT_HANDLE)
|
|
if c2pwrite is None:
|
|
_, c2pwrite = _subprocess.CreatePipe(None, 0)
|
|
elif stdout == PIPE:
|
|
c2pread, c2pwrite = _subprocess.CreatePipe(None, 0)
|
|
elif isinstance(stdout, int):
|
|
c2pwrite = msvcrt.get_osfhandle(stdout)
|
|
else:
|
|
# Assuming file-like object
|
|
c2pwrite = msvcrt.get_osfhandle(stdout.fileno())
|
|
c2pwrite = self._make_inheritable(c2pwrite)
|
|
|
|
if stderr is None:
|
|
errwrite = _subprocess.GetStdHandle(
|
|
_subprocess.STD_ERROR_HANDLE)
|
|
if errwrite is None:
|
|
_, errwrite = _subprocess.CreatePipe(None, 0)
|
|
elif stderr == PIPE:
|
|
errread, errwrite = _subprocess.CreatePipe(None, 0)
|
|
elif stderr == STDOUT:
|
|
errwrite = c2pwrite
|
|
elif isinstance(stderr, int):
|
|
errwrite = msvcrt.get_osfhandle(stderr)
|
|
else:
|
|
# Assuming file-like object
|
|
errwrite = msvcrt.get_osfhandle(stderr.fileno())
|
|
errwrite = self._make_inheritable(errwrite)
|
|
|
|
return (p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite)
|
|
|
|
def _make_inheritable(self, handle):
|
|
"""Return a duplicate of handle, which is inheritable"""
|
|
return _subprocess.DuplicateHandle(
|
|
_subprocess.GetCurrentProcess(),
|
|
handle,
|
|
_subprocess.GetCurrentProcess(),
|
|
0,
|
|
1,
|
|
_subprocess.DUPLICATE_SAME_ACCESS
|
|
)
|
|
|
|
def _find_w9xpopen(self):
|
|
"""Find and return absolut path to w9xpopen.exe"""
|
|
w9xpopen = os.path.join(
|
|
os.path.dirname(_subprocess.GetModuleFileName(0)),
|
|
"w9xpopen.exe")
|
|
if not os.path.exists(w9xpopen):
|
|
# Eeek - file-not-found - possibly an embedding
|
|
# situation - see if we can locate it in sys.exec_prefix
|
|
w9xpopen = os.path.join(os.path.dirname(sys.exec_prefix),
|
|
"w9xpopen.exe")
|
|
if not os.path.exists(w9xpopen):
|
|
raise RuntimeError("Cannot locate w9xpopen.exe, which is "
|
|
"needed for Popen to work with your "
|
|
"shell or platform.")
|
|
return w9xpopen
|
|
|
|
def _execute_child(self, args, executable, preexec_fn, close_fds,
|
|
cwd, env, universal_newlines,
|
|
startupinfo, creationflags, shell,
|
|
p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite):
|
|
"""Execute program (MS Windows version)"""
|
|
|
|
if not isinstance(args, types.StringTypes):
|
|
args = list2cmdline(args)
|
|
|
|
# Process startup details
|
|
if startupinfo is None:
|
|
startupinfo = STARTUPINFO()
|
|
if None not in (p2cread, c2pwrite, errwrite):
|
|
startupinfo.dwFlags |= _subprocess.STARTF_USESTDHANDLES
|
|
startupinfo.hStdInput = p2cread
|
|
startupinfo.hStdOutput = c2pwrite
|
|
startupinfo.hStdError = errwrite
|
|
|
|
if shell:
|
|
startupinfo.dwFlags |= _subprocess.STARTF_USESHOWWINDOW
|
|
startupinfo.wShowWindow = _subprocess.SW_HIDE
|
|
comspec = os.environ.get("COMSPEC", "cmd.exe")
|
|
args = '{} /c "{}"'.format(comspec, args)
|
|
if (_subprocess.GetVersion() >= 0x80000000 or
|
|
os.path.basename(comspec).lower() == "command.com"):
|
|
# Win9x, or using command.com on NT. We need to
|
|
# use the w9xpopen intermediate program. For more
|
|
# information, see KB Q150956
|
|
# (http://web.archive.org/web/20011105084002/http://support.microsoft.com/support/kb/articles/Q150/9/56.asp)
|
|
w9xpopen = self._find_w9xpopen()
|
|
args = '"%s" %s' % (w9xpopen, args)
|
|
# Not passing CREATE_NEW_CONSOLE has been known to
|
|
# cause random failures on win9x. Specifically a
|
|
# dialog: "Your program accessed mem currently in
|
|
# use at xxx" and a hopeful warning about the
|
|
# stability of your system. Cost is Ctrl+C wont
|
|
# kill children.
|
|
creationflags |= _subprocess.CREATE_NEW_CONSOLE
|
|
|
|
# Start the process
|
|
try:
|
|
try:
|
|
hp, ht, pid, tid = _subprocess.CreateProcess(
|
|
executable, args,
|
|
# no special
|
|
# security
|
|
None, None,
|
|
int(not close_fds),
|
|
creationflags,
|
|
env,
|
|
cwd,
|
|
startupinfo)
|
|
except pywintypes.error, e:
|
|
# Translate pywintypes.error to WindowsError, which is
|
|
# a subclass of OSError. FIXME: We should really
|
|
# translate errno using _sys_errlist (or similar), but
|
|
# how can this be done from Python?
|
|
raise WindowsError(*e.args)
|
|
finally:
|
|
# Child is launched. Close the parent's copy of those pipe
|
|
# handles that only the child should have open. You need
|
|
# to make sure that no handles to the write end of the
|
|
# output pipe are maintained in this process or else the
|
|
# pipe will not close when the child process exits and the
|
|
# ReadFile will hang.
|
|
if p2cread is not None:
|
|
p2cread.Close()
|
|
if c2pwrite is not None:
|
|
c2pwrite.Close()
|
|
if errwrite is not None:
|
|
errwrite.Close()
|
|
|
|
# Retain the process handle, but close the thread handle
|
|
self._child_created = True
|
|
self._handle = hp
|
|
self.pid = pid
|
|
ht.Close()
|
|
|
|
def _internal_poll(
|
|
self, _deadstate=None,
|
|
_WaitForSingleObject=_subprocess.WaitForSingleObject,
|
|
_WAIT_OBJECT_0=_subprocess.WAIT_OBJECT_0,
|
|
_GetExitCodeProcess=_subprocess.GetExitCodeProcess
|
|
):
|
|
"""Check if child process has terminated. Returns returncode
|
|
attribute.
|
|
|
|
This method is called by __del__, so it can only refer to objects
|
|
in its local scope.
|
|
|
|
"""
|
|
if self.returncode is None:
|
|
if _WaitForSingleObject(self._handle, 0) == _WAIT_OBJECT_0:
|
|
self.returncode = _GetExitCodeProcess(self._handle)
|
|
return self.returncode
|
|
|
|
def wait(self):
|
|
"""Wait for child process to terminate. Returns returncode
|
|
attribute."""
|
|
if self.returncode is None:
|
|
_subprocess.WaitForSingleObject(self._handle,
|
|
_subprocess.INFINITE)
|
|
self.returncode = _subprocess.GetExitCodeProcess(self._handle)
|
|
return self.returncode
|
|
|
|
def _readerthread(self, fh, buffer):
|
|
buffer.append(fh.read())
|
|
|
|
def _communicate(self, input):
|
|
stdout = None # Return
|
|
stderr = None # Return
|
|
|
|
if self.stdout:
|
|
stdout = []
|
|
stdout_thread = threading.Thread(target=self._readerthread,
|
|
args=(self.stdout, stdout))
|
|
stdout_thread.setDaemon(True)
|
|
stdout_thread.start()
|
|
if self.stderr:
|
|
stderr = []
|
|
stderr_thread = threading.Thread(target=self._readerthread,
|
|
args=(self.stderr, stderr))
|
|
stderr_thread.setDaemon(True)
|
|
stderr_thread.start()
|
|
|
|
if self.stdin:
|
|
if input is not None:
|
|
try:
|
|
self.stdin.write(input)
|
|
except IOError, e:
|
|
if e.errno != errno.EPIPE:
|
|
raise
|
|
self.stdin.close()
|
|
|
|
if self.stdout:
|
|
stdout_thread.join()
|
|
if self.stderr:
|
|
stderr_thread.join()
|
|
|
|
# All data exchanged. Translate lists into strings.
|
|
if stdout is not None:
|
|
stdout = stdout[0]
|
|
if stderr is not None:
|
|
stderr = stderr[0]
|
|
|
|
# Translate newlines, if requested. We cannot let the file
|
|
# object do the translation: It is based on stdio, which is
|
|
# impossible to combine with select (unless forcing no
|
|
# buffering).
|
|
if self.universal_newlines and hasattr(file, 'newlines'):
|
|
if stdout:
|
|
stdout = self._translate_newlines(stdout)
|
|
if stderr:
|
|
stderr = self._translate_newlines(stderr)
|
|
|
|
self.wait()
|
|
return (stdout, stderr)
|
|
|
|
def send_signal(self, sig):
|
|
"""Send a signal to the process
|
|
"""
|
|
if sig == signal.SIGTERM:
|
|
self.terminate()
|
|
elif sig == signal.CTRL_C_EVENT:
|
|
os.kill(self.pid, signal.CTRL_C_EVENT)
|
|
elif sig == signal.CTRL_BREAK_EVENT:
|
|
os.kill(self.pid, signal.CTRL_BREAK_EVENT)
|
|
else:
|
|
raise ValueError("Unsupported signal: {}".format(sig))
|
|
|
|
def terminate(self):
|
|
"""Terminates the process
|
|
"""
|
|
_subprocess.TerminateProcess(self._handle, 1)
|
|
|
|
kill = terminate
|
|
|
|
else:
|
|
#
|
|
# POSIX methods
|
|
#
|
|
def _get_handles(self, stdin, stdout, stderr):
|
|
"""Construct and return tuple with IO objects:
|
|
p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite
|
|
"""
|
|
p2cread, p2cwrite = None, None
|
|
c2pread, c2pwrite = None, None
|
|
errread, errwrite = None, None
|
|
|
|
if stdin is None:
|
|
pass
|
|
elif stdin == PIPE:
|
|
p2cread, p2cwrite = self.pipe_cloexec()
|
|
elif isinstance(stdin, int):
|
|
p2cread = stdin
|
|
else:
|
|
# Assuming file-like object
|
|
p2cread = stdin.fileno()
|
|
|
|
if stdout is None:
|
|
pass
|
|
elif stdout == PIPE:
|
|
c2pread, c2pwrite = self.pipe_cloexec()
|
|
elif isinstance(stdout, int):
|
|
c2pwrite = stdout
|
|
else:
|
|
# Assuming file-like object
|
|
c2pwrite = stdout.fileno()
|
|
|
|
if stderr is None:
|
|
pass
|
|
elif stderr == PIPE:
|
|
errread, errwrite = self.pipe_cloexec()
|
|
elif stderr == STDOUT:
|
|
errwrite = c2pwrite
|
|
elif isinstance(stderr, int):
|
|
errwrite = stderr
|
|
else:
|
|
# Assuming file-like object
|
|
errwrite = stderr.fileno()
|
|
|
|
return (p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite)
|
|
|
|
def _set_cloexec_flag(self, fd, cloexec=True):
|
|
try:
|
|
cloexec_flag = fcntl.FD_CLOEXEC
|
|
except AttributeError:
|
|
cloexec_flag = 1
|
|
|
|
old = fcntl.fcntl(fd, fcntl.F_GETFD)
|
|
if cloexec:
|
|
fcntl.fcntl(fd, fcntl.F_SETFD, old | cloexec_flag)
|
|
else:
|
|
fcntl.fcntl(fd, fcntl.F_SETFD, old & ~cloexec_flag)
|
|
|
|
def pipe_cloexec(self):
|
|
"""Create a pipe with FDs set CLOEXEC."""
|
|
# Pipes' FDs are set CLOEXEC by default because we don't want them
|
|
# to be inherited by other subprocesses: the CLOEXEC flag is
|
|
# removed from the child's FDs by _dup2(), between fork() and
|
|
# exec().
|
|
# This is not atomic: we would need the pipe2() syscall for that.
|
|
r, w = os.pipe()
|
|
self._set_cloexec_flag(r)
|
|
self._set_cloexec_flag(w)
|
|
return r, w
|
|
|
|
def _close_fds(self, but):
|
|
if hasattr(os, 'closerange'):
|
|
os.closerange(3, but)
|
|
os.closerange(but + 1, MAXFD)
|
|
else:
|
|
for i in xrange(3, MAXFD):
|
|
if i == but:
|
|
continue
|
|
try:
|
|
os.close(i)
|
|
except:
|
|
pass
|
|
|
|
def _execute_child(self, args, executable, preexec_fn, close_fds,
|
|
cwd, env, universal_newlines,
|
|
startupinfo, creationflags, shell,
|
|
p2cread, p2cwrite,
|
|
c2pread, c2pwrite,
|
|
errread, errwrite):
|
|
"""Execute program (POSIX version)"""
|
|
|
|
if isinstance(args, types.StringTypes):
|
|
args = [args]
|
|
else:
|
|
args = list(args)
|
|
|
|
if shell:
|
|
args = ["/bin/sh", "-c"] + args
|
|
if executable:
|
|
args[0] = executable
|
|
|
|
if executable is None:
|
|
executable = args[0]
|
|
|
|
# For transferring possible exec failure from child to parent
|
|
# The first char specifies the exception type: 0 means
|
|
# OSError, 1 means some other error.
|
|
errpipe_read, errpipe_write = self.pipe_cloexec()
|
|
try:
|
|
try:
|
|
gc_was_enabled = gc.isenabled()
|
|
# Disable gc to avoid bug where gc -> file_dealloc ->
|
|
# write to stderr -> hang.
|
|
# http://bugs.python.org/issue1336
|
|
gc.disable()
|
|
try:
|
|
self.pid = os.fork()
|
|
except:
|
|
if gc_was_enabled:
|
|
gc.enable()
|
|
raise
|
|
self._child_created = True
|
|
if self.pid == 0:
|
|
# Child
|
|
try:
|
|
# Close parent's pipe ends
|
|
if p2cwrite is not None:
|
|
os.close(p2cwrite)
|
|
if c2pread is not None:
|
|
os.close(c2pread)
|
|
if errread is not None:
|
|
os.close(errread)
|
|
os.close(errpipe_read)
|
|
|
|
# When duping fds, if there arises a situation
|
|
# where one of the fds is either 0, 1 or 2, it
|
|
# is possible that it is overwritten (#12607).
|
|
if c2pwrite == 0:
|
|
c2pwrite = os.dup(c2pwrite)
|
|
if errwrite == 0 or errwrite == 1:
|
|
errwrite = os.dup(errwrite)
|
|
|
|
# Dup fds for child
|
|
def _dup2(a, b):
|
|
# dup2() removes the CLOEXEC flag but
|
|
# we must do it ourselves if dup2()
|
|
# would be a no-op (issue #10806).
|
|
if a == b:
|
|
self._set_cloexec_flag(a, False)
|
|
elif a is not None:
|
|
os.dup2(a, b)
|
|
_dup2(p2cread, 0)
|
|
_dup2(c2pwrite, 1)
|
|
_dup2(errwrite, 2)
|
|
|
|
# Close pipe fds. Make sure we don't close the
|
|
# same fd more than once, or standard fds.
|
|
closed = set([None])
|
|
for fd in [p2cread, c2pwrite, errwrite]:
|
|
if fd not in closed and fd > 2:
|
|
os.close(fd)
|
|
closed.add(fd)
|
|
|
|
# Close all other fds, if asked for
|
|
if close_fds:
|
|
self._close_fds(but=errpipe_write)
|
|
|
|
if cwd is not None:
|
|
os.chdir(cwd)
|
|
|
|
if preexec_fn:
|
|
preexec_fn()
|
|
|
|
if env is None:
|
|
os.execvp(executable, args)
|
|
else:
|
|
os.execvpe(executable, args, env)
|
|
|
|
except:
|
|
exc_type, exc_value, tb = sys.exc_info()
|
|
# Save the traceback and attach it to the exception
|
|
# object
|
|
exc_lines = traceback.format_exception(exc_type,
|
|
exc_value,
|
|
tb)
|
|
exc_value.child_traceback = ''.join(exc_lines)
|
|
os.write(errpipe_write, pickle.dumps(exc_value))
|
|
|
|
# This exitcode won't be reported to applications,
|
|
# so it really doesn't matter what we return.
|
|
os._exit(255)
|
|
|
|
# Parent
|
|
if gc_was_enabled:
|
|
gc.enable()
|
|
finally:
|
|
# be sure the FD is closed no matter what
|
|
os.close(errpipe_write)
|
|
|
|
if p2cread is not None and p2cwrite is not None:
|
|
os.close(p2cread)
|
|
if c2pwrite is not None and c2pread is not None:
|
|
os.close(c2pwrite)
|
|
if errwrite is not None and errread is not None:
|
|
os.close(errwrite)
|
|
|
|
# Wait for exec to fail or succeed; possibly raising exception
|
|
# Exception limited to 1M
|
|
data = _eintr_retry_call(os.read, errpipe_read, 1048576)
|
|
finally:
|
|
# be sure the FD is closed no matter what
|
|
os.close(errpipe_read)
|
|
|
|
if data != "":
|
|
try:
|
|
_eintr_retry_call(os.waitpid, self.pid, 0)
|
|
except OSError, e:
|
|
if e.errno != errno.ECHILD:
|
|
raise
|
|
child_exception = pickle.loads(data)
|
|
for fd in (p2cwrite, c2pread, errread):
|
|
if fd is not None:
|
|
os.close(fd)
|
|
raise child_exception
|
|
|
|
def _handle_exitstatus(self, sts, _WIFSIGNALED=os.WIFSIGNALED,
|
|
_WTERMSIG=os.WTERMSIG, _WIFEXITED=os.WIFEXITED,
|
|
_WEXITSTATUS=os.WEXITSTATUS):
|
|
# This method is called (indirectly) by __del__, so it cannot
|
|
# refer to anything outside of its local scope."""
|
|
if _WIFSIGNALED(sts):
|
|
self.returncode = -_WTERMSIG(sts)
|
|
elif _WIFEXITED(sts):
|
|
self.returncode = _WEXITSTATUS(sts)
|
|
else:
|
|
# Should never happen
|
|
raise RuntimeError("Unknown child exit status!")
|
|
|
|
def _internal_poll(self, _deadstate=None, _waitpid=os.waitpid,
|
|
_WNOHANG=os.WNOHANG, _os_error=os.error):
|
|
"""Check if child process has terminated. Returns returncode
|
|
attribute.
|
|
|
|
This method is called by __del__, so it cannot reference anything
|
|
outside of the local scope (nor can any methods it calls).
|
|
|
|
"""
|
|
if self.returncode is None:
|
|
try:
|
|
pid, sts = _waitpid(self.pid, _WNOHANG)
|
|
if pid == self.pid:
|
|
self._handle_exitstatus(sts)
|
|
except _os_error:
|
|
if _deadstate is not None:
|
|
self.returncode = _deadstate
|
|
return self.returncode
|
|
|
|
def wait(self):
|
|
"""Wait for child process to terminate. Returns returncode
|
|
attribute."""
|
|
if self.returncode is None:
|
|
try:
|
|
pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0)
|
|
except OSError, e:
|
|
if e.errno != errno.ECHILD:
|
|
raise
|
|
# This happens if SIGCLD is set to be ignored or waiting
|
|
# for child processes has otherwise been disabled for our
|
|
# process. This child is dead, we can't get the status.
|
|
sts = 0
|
|
self._handle_exitstatus(sts)
|
|
return self.returncode
|
|
|
|
def _communicate(self, input):
|
|
if self.stdin:
|
|
# Flush stdio buffer. This might block, if the user has
|
|
# been writing to .stdin in an uncontrolled fashion.
|
|
self.stdin.flush()
|
|
if not input:
|
|
self.stdin.close()
|
|
|
|
if _has_poll:
|
|
stdout, stderr = self._communicate_with_poll(input)
|
|
else:
|
|
stdout, stderr = self._communicate_with_select(input)
|
|
|
|
# All data exchanged. Translate lists into strings.
|
|
if stdout is not None:
|
|
stdout = ''.join(stdout)
|
|
if stderr is not None:
|
|
stderr = ''.join(stderr)
|
|
|
|
# Translate newlines, if requested. We cannot let the file
|
|
# object do the translation: It is based on stdio, which is
|
|
# impossible to combine with select (unless forcing no
|
|
# buffering).
|
|
if self.universal_newlines and hasattr(file, 'newlines'):
|
|
if stdout:
|
|
stdout = self._translate_newlines(stdout)
|
|
if stderr:
|
|
stderr = self._translate_newlines(stderr)
|
|
|
|
self.wait()
|
|
return (stdout, stderr)
|
|
|
|
def _communicate_with_poll(self, input):
|
|
stdout = None # Return
|
|
stderr = None # Return
|
|
fd2file = {}
|
|
fd2output = {}
|
|
|
|
poller = select.poll()
|
|
|
|
def register_and_append(file_obj, eventmask):
|
|
poller.register(file_obj.fileno(), eventmask)
|
|
fd2file[file_obj.fileno()] = file_obj
|
|
|
|
def close_unregister_and_remove(fd):
|
|
poller.unregister(fd)
|
|
fd2file[fd].close()
|
|
fd2file.pop(fd)
|
|
|
|
if self.stdin and input:
|
|
register_and_append(self.stdin, select.POLLOUT)
|
|
|
|
select_POLLIN_POLLPRI = select.POLLIN | select.POLLPRI
|
|
if self.stdout:
|
|
register_and_append(self.stdout, select_POLLIN_POLLPRI)
|
|
fd2output[self.stdout.fileno()] = stdout = []
|
|
if self.stderr:
|
|
register_and_append(self.stderr, select_POLLIN_POLLPRI)
|
|
fd2output[self.stderr.fileno()] = stderr = []
|
|
|
|
input_offset = 0
|
|
while fd2file:
|
|
try:
|
|
ready = poller.poll()
|
|
except select.error, e:
|
|
if e.args[0] == errno.EINTR:
|
|
continue
|
|
raise
|
|
|
|
for fd, mode in ready:
|
|
if mode & select.POLLOUT:
|
|
chunk = input[input_offset: input_offset + _PIPE_BUF]
|
|
try:
|
|
input_offset += os.write(fd, chunk)
|
|
except OSError, e:
|
|
if e.errno == errno.EPIPE:
|
|
close_unregister_and_remove(fd)
|
|
else:
|
|
raise
|
|
else:
|
|
if input_offset >= len(input):
|
|
close_unregister_and_remove(fd)
|
|
elif mode & select_POLLIN_POLLPRI:
|
|
data = os.read(fd, 4096)
|
|
if not data:
|
|
close_unregister_and_remove(fd)
|
|
fd2output[fd].append(data)
|
|
else:
|
|
# Ignore hang up or errors.
|
|
close_unregister_and_remove(fd)
|
|
|
|
return (stdout, stderr)
|
|
|
|
def _communicate_with_select(self, input):
|
|
read_set = []
|
|
write_set = []
|
|
stdout = None # Return
|
|
stderr = None # Return
|
|
|
|
if self.stdin and input:
|
|
write_set.append(self.stdin)
|
|
if self.stdout:
|
|
read_set.append(self.stdout)
|
|
stdout = []
|
|
if self.stderr:
|
|
read_set.append(self.stderr)
|
|
stderr = []
|
|
|
|
input_offset = 0
|
|
while read_set or write_set:
|
|
try:
|
|
rlist, wlist, xlist = select.select(
|
|
read_set, write_set, [])
|
|
except select.error, e:
|
|
if e.args[0] == errno.EINTR:
|
|
continue
|
|
raise
|
|
|
|
if self.stdin in wlist:
|
|
chunk = input[input_offset: input_offset + _PIPE_BUF]
|
|
try:
|
|
bytes_written = os.write(self.stdin.fileno(), chunk)
|
|
except OSError, e:
|
|
if e.errno == errno.EPIPE:
|
|
self.stdin.close()
|
|
write_set.remove(self.stdin)
|
|
else:
|
|
raise
|
|
else:
|
|
input_offset += bytes_written
|
|
if input_offset >= len(input):
|
|
self.stdin.close()
|
|
write_set.remove(self.stdin)
|
|
|
|
if self.stdout in rlist:
|
|
data = os.read(self.stdout.fileno(), 1024)
|
|
if data == "":
|
|
self.stdout.close()
|
|
read_set.remove(self.stdout)
|
|
stdout.append(data)
|
|
|
|
if self.stderr in rlist:
|
|
data = os.read(self.stderr.fileno(), 1024)
|
|
if data == "":
|
|
self.stderr.close()
|
|
read_set.remove(self.stderr)
|
|
stderr.append(data)
|
|
|
|
return (stdout, stderr)
|
|
|
|
def send_signal(self, sig):
|
|
"""Send a signal to the process
|
|
"""
|
|
os.kill(self.pid, sig)
|
|
|
|
def terminate(self):
|
|
"""Terminate the process with SIGTERM
|
|
"""
|
|
self.send_signal(signal.SIGTERM)
|
|
|
|
def kill(self):
|
|
"""Kill the process with SIGKILL
|
|
"""
|
|
self.send_signal(signal.SIGKILL)
|
|
|
|
|
|
def _demo_posix():
|
|
#
|
|
# Example 1: Simple redirection: Get process list
|
|
#
|
|
plist = Popen(["ps"], stdout=PIPE).communicate()[0]
|
|
print "Process list:"
|
|
print plist
|
|
|
|
#
|
|
# Example 2: Change uid before executing child
|
|
#
|
|
if os.getuid() == 0:
|
|
p = Popen(["id"], preexec_fn=lambda: os.setuid(100))
|
|
p.wait()
|
|
|
|
#
|
|
# Example 3: Connecting several subprocesses
|
|
#
|
|
print "Looking for 'hda'..."
|
|
p1 = Popen(["dmesg"], stdout=PIPE)
|
|
p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
|
|
print repr(p2.communicate()[0])
|
|
|
|
#
|
|
# Example 4: Catch execution error
|
|
#
|
|
print
|
|
print "Trying a weird file..."
|
|
try:
|
|
print Popen(["/this/path/does/not/exist"]).communicate()
|
|
except OSError, e:
|
|
if e.errno == errno.ENOENT:
|
|
print "The file didn't exist. I thought so..."
|
|
print "Child traceback:"
|
|
print e.child_traceback
|
|
else:
|
|
print "Error", e.errno
|
|
else:
|
|
print >>sys.stderr, "Gosh. No error."
|
|
|
|
|
|
def _demo_windows():
|
|
#
|
|
# Example 1: Connecting several subprocesses
|
|
#
|
|
print "Looking for 'PROMPT' in set output..."
|
|
p1 = Popen("set", stdout=PIPE, shell=True)
|
|
p2 = Popen('find "PROMPT"', stdin=p1.stdout, stdout=PIPE)
|
|
print repr(p2.communicate()[0])
|
|
|
|
#
|
|
# Example 2: Simple execution of program
|
|
#
|
|
print "Executing calc..."
|
|
p = Popen("calc")
|
|
p.wait()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
if mswindows:
|
|
_demo_windows()
|
|
else:
|
|
_demo_posix()
|