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122 lines
4.0 KiB
Python
122 lines
4.0 KiB
Python
# Copyright 2009, Google Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""Web Sockets utilities.
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"""
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import StringIO
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import os
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import re
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import traceback
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def get_stack_trace():
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"""Get the current stack trace as string.
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This is needed to support Python 2.3.
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TODO: Remove this when we only support Python 2.4 and above.
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Use traceback.format_exc instead.
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"""
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out = StringIO.StringIO()
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traceback.print_exc(file=out)
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return out.getvalue()
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def prepend_message_to_exception(message, exc):
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"""Prepend message to the exception."""
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exc.args = (message + str(exc),)
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return
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def __translate_interp(interp, cygwin_path):
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"""Translate interp program path for Win32 python to run cygwin program
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(e.g. perl). Note that it doesn't support path that contains space,
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which is typically true for Unix, where #!-script is written.
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For Win32 python, cygwin_path is a directory of cygwin binaries.
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Args:
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interp: interp command line
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cygwin_path: directory name of cygwin binary, or None
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Returns:
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translated interp command line.
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"""
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if not cygwin_path:
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return interp
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m = re.match("^[^ ]*/([^ ]+)( .*)?", interp)
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if m:
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cmd = os.path.join(cygwin_path, m.group(1))
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return cmd + m.group(2)
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return interp
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def get_script_interp(script_path, cygwin_path=None):
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"""Gets #!-interpreter command line from the script.
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It also fixes command path. When Cygwin Python is used, e.g. in WebKit,
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it could run "/usr/bin/perl -wT hello.pl".
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When Win32 Python is used, e.g. in Chromium, it couldn't. So, fix
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"/usr/bin/perl" to "<cygwin_path>\perl.exe".
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Args:
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script_path: pathname of the script
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cygwin_path: directory name of cygwin binary, or None
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Returns:
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#!-interpreter command line, or None if it is not #!-script.
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"""
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fp = open(script_path)
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line = fp.readline()
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fp.close()
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m = re.match("^#!(.*)", line)
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if m:
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return __translate_interp(m.group(1), cygwin_path)
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return None
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def wrap_popen3_for_win(cygwin_path):
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"""Wrap popen3 to support #!-script on Windows.
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Args:
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cygwin_path: path for cygwin binary if command path is needed to be
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translated. None if no translation required.
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"""
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__orig_popen3 = os.popen3
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def __wrap_popen3(cmd, mode='t', bufsize=-1):
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cmdline = cmd.split(' ')
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interp = get_script_interp(cmdline[0], cygwin_path)
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if interp:
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cmd = interp + " " + cmd
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return __orig_popen3(cmd, mode, bufsize)
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os.popen3 = __wrap_popen3
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# vi:sts=4 sw=4 et
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