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pproc.py

# borrowed from python 2.5.2c1
# Copyright (c) 2003-2005 by Peter Astrand <astrand@lysator.liu.se>
# Licensed to PSF under a Contributor Agreement.

import sys
mswindows = (sys.platform == "win32")

import os
import types
import traceback
import gc

class CalledProcessError(Exception):
    def __init__(self, returncode, cmd):
        self.returncode = returncode
        self.cmd = cmd
    def __str__(self):
        return "Command '%s' returned non-zero exit status %d" % (self.cmd, self.returncode)

if mswindows:
    import threading
    import msvcrt
    if 0:
        import pywintypes
        from win32api import GetStdHandle, STD_INPUT_HANDLE, \
                             STD_OUTPUT_HANDLE, STD_ERROR_HANDLE
        from win32api import GetCurrentProcess, DuplicateHandle, \
                             GetModuleFileName, GetVersion
        from win32con import DUPLICATE_SAME_ACCESS, SW_HIDE
        from win32pipe import CreatePipe
        from win32process import CreateProcess, STARTUPINFO, \
                                 GetExitCodeProcess, STARTF_USESTDHANDLES, \
                                 STARTF_USESHOWWINDOW, CREATE_NEW_CONSOLE
        from win32event import WaitForSingleObject, INFINITE, WAIT_OBJECT_0
    else:
        from _subprocess import *
        class STARTUPINFO:
            dwFlags = 0
            hStdInput = None
            hStdOutput = None
            hStdError = None
            wShowWindow = 0
        class pywintypes:
            error = IOError
else:
    import select
    import errno
    import fcntl
    import pickle

__all__ = ["Popen", "PIPE", "STDOUT", "call", "check_call", "CalledProcessError"]

try:
    MAXFD = os.sysconf("SC_OPEN_MAX")
except:
    MAXFD = 256

try:
    False
except NameError:
    False = 0
    True = 1

_active = []

def _cleanup():
    for inst in _active[:]:
        if inst.poll(_deadstate=sys.maxint) >= 0:
            try:
                _active.remove(inst)
            except ValueError:
                pass

PIPE = -1
STDOUT = -2


def call(*popenargs, **kwargs):
    return Popen(*popenargs, **kwargs).wait()

def check_call(*popenargs, **kwargs):
    retcode = call(*popenargs, **kwargs)
    cmd = kwargs.get("args")
    if cmd is None:
        cmd = popenargs[0]
    if retcode:
        raise CalledProcessError(retcode, cmd)
    return retcode


def list2cmdline(seq):
    result = []
    needquote = False
    for arg in seq:
        bs_buf = []

        if result:
            result.append(' ')

        needquote = (" " in arg) or ("\t" in arg) or arg == ""
        if needquote:
            result.append('"')

        for c in arg:
            if c == '\\':
                bs_buf.append(c)
            elif c == '"':
                result.append('\\' * len(bs_buf)*2)
                bs_buf = []
                result.append('\\"')
            else:
                if bs_buf:
                    result.extend(bs_buf)
                    bs_buf = []
                result.append(c)

        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):
        _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:
                raise ValueError("close_fds is not supported on Windows platforms")
        else:
            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

        (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 stdin is None and p2cwrite is not None:
                os.close(p2cwrite)
                p2cwrite = None
            if stdout is None and c2pread is not None:
                os.close(c2pread)
                c2pread = None
            if stderr is None and errread is not None:
                os.close(errread)
                errread = None

        if p2cwrite:
            self.stdin = os.fdopen(p2cwrite, 'wb', bufsize)
        if c2pread:
            if universal_newlines:
                self.stdout = os.fdopen(c2pread, 'rU', bufsize)
            else:
                self.stdout = os.fdopen(c2pread, 'rb', bufsize)
        if errread:
            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, sys=sys):
        if not self._child_created:
            return
        self.poll(_deadstate=sys.maxint)
        if self.returncode is None and _active is not None:
            _active.append(self)


    def communicate(self, input=None):
        if [self.stdin, self.stdout, self.stderr].count(None) >= 2:
            stdout = None
            stderr = None
            if self.stdin:
                if input:
                    self.stdin.write(input)
                self.stdin.close()
            elif self.stdout:
                stdout = self.stdout.read()
            elif self.stderr:
                stderr = self.stderr.read()
            self.wait()
            return (stdout, stderr)

        return self._communicate(input)


    if mswindows:
        def _get_handles(self, stdin, stdout, stderr):
            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 = GetStdHandle(STD_INPUT_HANDLE)
            if p2cread is not None:
                pass
            elif stdin is None or stdin == PIPE:
                p2cread, p2cwrite = CreatePipe(None, 0)
                p2cwrite = p2cwrite.Detach()
                p2cwrite = msvcrt.open_osfhandle(p2cwrite, 0)
            elif isinstance(stdin, int):
                p2cread = msvcrt.get_osfhandle(stdin)
            else:
                p2cread = msvcrt.get_osfhandle(stdin.fileno())
            p2cread = self._make_inheritable(p2cread)

            if stdout is None:
                c2pwrite = GetStdHandle(STD_OUTPUT_HANDLE)
            if c2pwrite is not None:
                pass
            elif stdout is None or stdout == PIPE:
                c2pread, c2pwrite = CreatePipe(None, 0)
                c2pread = c2pread.Detach()
                c2pread = msvcrt.open_osfhandle(c2pread, 0)
            elif isinstance(stdout, int):
                c2pwrite = msvcrt.get_osfhandle(stdout)
            else:
                c2pwrite = msvcrt.get_osfhandle(stdout.fileno())
            c2pwrite = self._make_inheritable(c2pwrite)

            if stderr is None:
                errwrite = GetStdHandle(STD_ERROR_HANDLE)
            if errwrite is not None:
                pass
            elif stderr is None or stderr == PIPE:
                errread, errwrite = CreatePipe(None, 0)
                errread = errread.Detach()
                errread = msvcrt.open_osfhandle(errread, 0)
            elif stderr == STDOUT:
                errwrite = c2pwrite
            elif isinstance(stderr, int):
                errwrite = msvcrt.get_osfhandle(stderr)
            else:
                errwrite = msvcrt.get_osfhandle(stderr.fileno())
            errwrite = self._make_inheritable(errwrite)

            return (p2cread, p2cwrite,
                    c2pread, c2pwrite,
                    errread, errwrite)
        def _make_inheritable(self, handle):
            return DuplicateHandle(GetCurrentProcess(), handle, GetCurrentProcess(), 0, 1, DUPLICATE_SAME_ACCESS)

        def _find_w9xpopen(self):
            w9xpopen = os.path.join(os.path.dirname(GetModuleFileName(0)), "w9xpopen.exe")
            if not os.path.exists(w9xpopen):
                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):

            if not isinstance(args, types.StringTypes):
                args = list2cmdline(args)

            if startupinfo is None:
                startupinfo = STARTUPINFO()
            if None not in (p2cread, c2pwrite, errwrite):
                startupinfo.dwFlags |= STARTF_USESTDHANDLES
                startupinfo.hStdInput = p2cread
                startupinfo.hStdOutput = c2pwrite
                startupinfo.hStdError = errwrite

            if shell:
                startupinfo.dwFlags |= STARTF_USESHOWWINDOW
                startupinfo.wShowWindow = SW_HIDE
                comspec = os.environ.get("COMSPEC", "cmd.exe")
                args = comspec + " /c " + args
                if (GetVersion() >= 0x80000000L or
                        os.path.basename(comspec).lower() == "command.com"):
                    w9xpopen = self._find_w9xpopen()
                    args = '"%s" %s' % (w9xpopen, args)
                    creationflags |= CREATE_NEW_CONSOLE

            try:
                hp, ht, pid, tid = CreateProcess(executable, args, None, None, 1, creationflags, env, cwd, startupinfo)
            except pywintypes.error, e:
                raise WindowsError(*e.args)

            self._child_created = True
            self._handle = hp
            self.pid = pid
            ht.Close()

            if p2cread is not None:
                p2cread.Close()
            if c2pwrite is not None:
                c2pwrite.Close()
            if errwrite is not None:
                errwrite.Close()


        def poll(self, _deadstate=None):
            if self.returncode is None:
                if WaitForSingleObject(self._handle, 0) == WAIT_OBJECT_0:
                    self.returncode = GetExitCodeProcess(self._handle)
            return self.returncode


        def wait(self):
            if self.returncode is None:
                obj = WaitForSingleObject(self._handle, INFINITE)
                self.returncode = GetExitCodeProcess(self._handle)
            return self.returncode

        def _readerthread(self, fh, buffer):
            buffer.append(fh.read())

        def _communicate(self, input):
            stdout = None
            stderr = None

            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:
                    self.stdin.write(input)
                self.stdin.close()

            if self.stdout:
                stdout_thread.join()
            if self.stderr:
                stderr_thread.join()

            if stdout is not None:
                stdout = stdout[0]
            if stderr is not None:
                stderr = stderr[0]

            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)

    else:
        def _get_handles(self, stdin, stdout, stderr):
            p2cread, p2cwrite = None, None
            c2pread, c2pwrite = None, None
            errread, errwrite = None, None

            if stdin is None:
                pass
            elif stdin == PIPE:
                p2cread, p2cwrite = os.pipe()
            elif isinstance(stdin, int):
                p2cread = stdin
            else:
                p2cread = stdin.fileno()

            if stdout is None:
                pass
            elif stdout == PIPE:
                c2pread, c2pwrite = os.pipe()
            elif isinstance(stdout, int):
                c2pwrite = stdout
            else:
                c2pwrite = stdout.fileno()

            if stderr is None:
                pass
            elif stderr == PIPE:
                errread, errwrite = os.pipe()
            elif stderr == STDOUT:
                errwrite = c2pwrite
            elif isinstance(stderr, int):
                errwrite = stderr
            else:
                errwrite = stderr.fileno()

            return (p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite)

        def _set_cloexec_flag(self, fd):
            try:
                cloexec_flag = fcntl.FD_CLOEXEC
            except AttributeError:
                cloexec_flag = 1

            old = fcntl.fcntl(fd, fcntl.F_GETFD)
            fcntl.fcntl(fd, fcntl.F_SETFD, old | cloexec_flag)

        def _close_fds(self, but):
            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):

            if isinstance(args, types.StringTypes):
                args = [args]
            else:
                args = list(args)

            if shell:
                args = ["/bin/sh", "-c"] + args

            if executable is None:
                executable = args[0]

            errpipe_read, errpipe_write = os.pipe()
            self._set_cloexec_flag(errpipe_write)

            gc_was_enabled = gc.isenabled()
            gc.disable()
            try:
                self.pid = os.fork()
            except:
                if gc_was_enabled:
                    gc.enable()
                raise
            self._child_created = True
            if self.pid == 0:
                try:
                    if p2cwrite:
                        os.close(p2cwrite)
                    if c2pread:
                        os.close(c2pread)
                    if errread:
                        os.close(errread)
                    os.close(errpipe_read)

                    if p2cread:
                        os.dup2(p2cread, 0)
                    if c2pwrite:
                        os.dup2(c2pwrite, 1)
                    if errwrite:
                        os.dup2(errwrite, 2)

                    if p2cread and p2cread not in (0,):
                        os.close(p2cread)
                    if c2pwrite and c2pwrite not in (p2cread, 1):
                        os.close(c2pwrite)
                    if errwrite and errwrite not in (p2cread, c2pwrite, 2):
                        os.close(errwrite)

                    if close_fds:
                        self._close_fds(but=errpipe_write)

                    if cwd is not None:
                        os.chdir(cwd)

                    if preexec_fn:
                        apply(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()
                    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))

                os._exit(255)

            if gc_was_enabled:
                gc.enable()
            os.close(errpipe_write)
            if p2cread and p2cwrite:
                os.close(p2cread)
            if c2pwrite and c2pread:
                os.close(c2pwrite)
            if errwrite and errread:
                os.close(errwrite)

            data = os.read(errpipe_read, 1048576)
            os.close(errpipe_read)
            if data != "":
                os.waitpid(self.pid, 0)
                child_exception = pickle.loads(data)
                raise child_exception

        def _handle_exitstatus(self, sts):
            if os.WIFSIGNALED(sts):
                self.returncode = -os.WTERMSIG(sts)
            elif os.WIFEXITED(sts):
                self.returncode = os.WEXITSTATUS(sts)
            else:
                raise RuntimeError("Unknown child exit status!")

        def poll(self, _deadstate=None):
            if self.returncode is None:
                try:
                    pid, sts = os.waitpid(self.pid, os.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):
            if self.returncode is None:
                pid, sts = os.waitpid(self.pid, 0)
                self._handle_exitstatus(sts)
            return self.returncode

        def _communicate(self, input):
            read_set = []
            write_set = []
            stdout = None
            stderr = None

            if self.stdin:
                self.stdin.flush()
                if input:
                    write_set.append(self.stdin)
                else:
                    self.stdin.close()
            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:
                rlist, wlist, xlist = select.select(read_set, write_set, [])

                if self.stdin in wlist:
                    bytes_written = os.write(self.stdin.fileno(), buffer(input, input_offset, 512))
                    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)

            if stdout is not None:
                stdout = ''.join(stdout)
            if stderr is not None:
                stderr = ''.join(stderr)

            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)


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