95 lines
3.0 KiB
Python
95 lines
3.0 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2010 Bastian Kleineidam
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""Utility functions."""
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import os
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import sys
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import subprocess
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import mimetypes
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import tempfile
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import traceback
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mimedb = mimetypes.MimeTypes(strict=False)
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# add missing encodings for Python <=2.5
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mimedb.encodings_map['.bz2'] = 'bzip2'
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mimedb.suffix_map['.tbz2'] = '.tar.bz2'
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mimedb.add_type('application/x-lzop', '.lzo', strict=False)
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mimedb.add_type('application/x-arj', '.arj', strict=False)
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class PatoolError (StandardError):
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"""Raised when errors occur."""
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pass
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def backtick (cmd):
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"""Return output from command."""
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return subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()[0]
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def run (cmd, **kwargs):
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"""Run command and raise subprocess.CalledProcessError on error."""
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subprocess.check_call(cmd, **kwargs)
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def guess_mime (filename):
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"""Guess the MIME type of given filename. Uses first mimetypes
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and then file(1) as fallback."""
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mime, encoding = mimedb.guess_type(filename, strict=False)
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if mime is None and os.path.isfile(filename):
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cmd = ["file", "--brief", "--mime-type", filename]
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try:
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mime = backtick(cmd).strip()
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except OSError, msg:
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pass
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return mime, encoding
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def check_filename (filename):
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"""Ensure that given filename is a valid, existing file."""
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if not os.path.isfile(filename):
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raise PatoolError("`%s' is not a file." % filename)
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if not os.path.exists(filename):
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raise PatoolError("File `%s' not found." % filename)
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if not os.access(filename, os.R_OK):
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raise PatoolError("File `%s' not readable." % filename)
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def tmpdir (dir=None):
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"""Return a temporary directory for extraction."""
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return tempfile.mkdtemp(suffix='', prefix='Unpack_', dir=dir)
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def shell_quote (value):
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"""Quote all shell metacharacters in given string value."""
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return '%s' % value
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def stripext (filename):
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"""Return the basename without extension of given filename."""
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return os.path.splitext(os.path.basename(filename))[0]
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def log_error (msg, out=sys.stderr):
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print >> out, "patool error:", msg
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def log_internal_error (out=sys.stderr):
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print >> out, "patool: internal error"
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etype, value = sys.exc_info()[:2]
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traceback.print_exc()
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print >> out, "System info:"
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print >> out, "Python %s on %s" % (sys.version, sys.platform)
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