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136 lines
4.9 KiB
Python
136 lines
4.9 KiB
Python
# Copyright (C) 2010 Google Inc. 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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"""generic routines to convert platform-specific paths to URIs."""
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import atexit
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import subprocess
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import sys
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import threading
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import urllib
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def abspath_to_uri(platform, path):
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"""Converts a platform-specific absolute path to a file: URL."""
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return "file:" + _escape(_convert_path(platform, path))
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def cygpath(path):
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"""Converts an absolute cygwin path to an absolute Windows path."""
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return _CygPath.convert_using_singleton(path)
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# Note that this object is not threadsafe and must only be called
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# from multiple threads under protection of a lock (as is done in cygpath())
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class _CygPath(object):
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"""Manages a long-running 'cygpath' process for file conversion."""
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_lock = None
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_singleton = None
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@staticmethod
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def stop_cygpath_subprocess():
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if not _CygPath._lock:
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return
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with _CygPath._lock:
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if _CygPath._singleton:
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_CygPath._singleton.stop()
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@staticmethod
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def convert_using_singleton(path):
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if not _CygPath._lock:
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_CygPath._lock = threading.Lock()
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with _CygPath._lock:
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if not _CygPath._singleton:
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_CygPath._singleton = _CygPath()
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# Make sure the cygpath subprocess always gets shutdown cleanly.
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atexit.register(_CygPath.stop_cygpath_subprocess)
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return _CygPath._singleton.convert(path)
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def __init__(self):
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self._child_process = None
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def start(self):
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assert(self._child_process is None)
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args = ['cygpath', '-f', '-', '-wa']
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self._child_process = subprocess.Popen(args,
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE)
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def is_running(self):
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if not self._child_process:
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return False
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return self._child_process.returncode is None
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def stop(self):
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if self._child_process:
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self._child_process.stdin.close()
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self._child_process.wait()
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self._child_process = None
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def convert(self, path):
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if not self.is_running():
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self.start()
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self._child_process.stdin.write("%s\r\n" % path)
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self._child_process.stdin.flush()
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windows_path = self._child_process.stdout.readline().rstrip()
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# Some versions of cygpath use lowercase drive letters while others
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# use uppercase. We always convert to uppercase for consistency.
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windows_path = '%s%s' % (windows_path[0].upper(), windows_path[1:])
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return windows_path
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def _escape(path):
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"""Handle any characters in the path that should be escaped."""
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# FIXME: web browsers don't appear to blindly quote every character
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# when converting filenames to files. Instead of using urllib's default
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# rules, we allow a small list of other characters through un-escaped.
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# It's unclear if this is the best possible solution.
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return urllib.quote(path, safe='/+:')
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def _convert_path(platform, path):
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"""Handles any os-specific path separators, mappings, etc."""
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if platform.is_cygwin():
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return _winpath_to_uri(cygpath(path))
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if platform.is_win():
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return _winpath_to_uri(path)
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return _unixypath_to_uri(path)
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def _winpath_to_uri(path):
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"""Converts a window absolute path to a file: URL."""
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return "///" + path.replace("\\", "/")
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def _unixypath_to_uri(path):
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"""Converts a unix-style path to a file: URL."""
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return "//" + path
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