2363d6de43
git-svn-id: http://google-refine.googlecode.com/svn/trunk@517 7d457c2a-affb-35e4-300a-418c747d4874
94 lines
3.1 KiB
Python
94 lines
3.1 KiB
Python
"""
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Implement subshell functionality for Jython.
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This is mostly to provide the environ object for the os module,
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and subshell execution functionality for os.system and popen* functions.
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javashell attempts to determine a suitable command shell for the host
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operating system, and uses that shell to determine environment variables
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and to provide subshell execution functionality.
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"""
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from java.lang import System, Runtime
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from java.io import File
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from java.io import IOException
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from java.io import InputStreamReader
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from java.io import BufferedReader
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from UserDict import UserDict
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import jarray
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import os
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import string
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import subprocess
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import sys
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import types
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import warnings
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warnings.warn('The javashell module is deprecated. Use the subprocess module.',
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DeprecationWarning, 2)
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__all__ = ["shellexecute"]
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def __warn( *args ):
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print " ".join( [str( arg ) for arg in args ])
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class _ShellEnv:
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"""Provide environment derived by spawning a subshell and parsing its
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environment. Also supports subshell execution functions and provides
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empty environment support for platforms with unknown shell functionality.
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"""
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def __init__( self, cmd=None, getEnv=None, keyTransform=None ):
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"""Construct _ShellEnv instance.
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cmd: list of exec() arguments required to run a command in
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subshell, or None
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getEnv: shell command to list environment variables, or None.
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deprecated
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keyTransform: normalization function for environment keys,
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such as 'string.upper', or None. deprecated.
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"""
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self.cmd = cmd
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self.environment = os.environ
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def execute( self, cmd ):
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"""Execute cmd in a shell, and return the java.lang.Process instance.
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Accepts either a string command to be executed in a shell,
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or a sequence of [executable, args...].
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"""
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shellCmd = self._formatCmd( cmd )
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env = self._formatEnvironment( self.environment )
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try:
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p = Runtime.getRuntime().exec( shellCmd, env, File(os.getcwd()) )
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return p
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except IOException, ex:
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raise OSError(
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0,
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"Failed to execute command (%s): %s" % ( shellCmd, ex )
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)
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########## utility methods
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def _formatCmd( self, cmd ):
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"""Format a command for execution in a shell."""
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if self.cmd is None:
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msgFmt = "Unable to execute commands in subshell because shell" \
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" functionality not implemented for OS %s" \
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" Failed command=%s"
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raise OSError( 0, msgFmt % ( os._name, cmd ))
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if isinstance(cmd, basestring):
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shellCmd = self.cmd + [cmd]
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else:
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shellCmd = cmd
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return shellCmd
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def _formatEnvironment( self, env ):
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"""Format enviroment in lines suitable for Runtime.exec"""
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lines = []
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for keyValue in env.items():
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lines.append( "%s=%s" % keyValue )
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return lines
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def _getOsType():
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return os._name
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_shellEnv = _ShellEnv(subprocess._shell_command)
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shellexecute = _shellEnv.execute
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