VirtualMailManager/common.py
author Pascal Volk <neverseen@users.sourceforge.net>
Sun, 25 Apr 2010 03:03:09 +0000
branchv0.6.x
changeset 263 07fdc93dde9f
parent 262 6eea85d8b91d
child 265 3c0173418d5d
permissions -rw-r--r--
VMM/common: improved version_hex() in order to convert also alpha, beta and release candidate versions.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2010, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.common
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    Some common functions
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"""
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import os
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import re
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from VirtualMailManager import ENCODING
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from VirtualMailManager.constants.ERROR import \
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     NOT_EXECUTABLE, NO_SUCH_BINARY, NO_SUCH_DIRECTORY
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from VirtualMailManager.errors import VMMError
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_ = lambda msg: msg
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def expand_path(path):
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    """Expands paths, starting with ``.`` or ``~``, to an absolute path."""
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    if path.startswith('.'):
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        return os.path.abspath(path)
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    if path.startswith('~'):
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        return os.path.expanduser(path)
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    return path
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def get_unicode(string):
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    """Converts `string` to `unicode`, if necessary."""
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    if isinstance(string, unicode):
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        return string
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    return unicode(string, ENCODING, 'replace')
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def is_dir(path):
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    """Checks if `path` is a directory.
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    Throws a `VMMError` if `path` is not a directory.
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    """
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    path = expand_path(path)
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    if not os.path.isdir(path):
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        raise VMMError(_(u"'%s' is not a directory") % get_unicode(path),
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                       NO_SUCH_DIRECTORY)
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    return path
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def exec_ok(binary):
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    """Checks if the `binary` exists and if it is executable.
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    Throws a `VMMError` if the `binary` isn't a file or is not
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    executable.
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    """
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    binary = expand_path(binary)
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    if not os.path.isfile(binary):
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        raise VMMError(_(u"'%s' is not a file") % get_unicode(binary),
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                       NO_SUCH_BINARY)
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    if not os.access(binary, os.X_OK):
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        raise VMMError(_(u"File is not executable: '%s'") %
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                       get_unicode(binary), NOT_EXECUTABLE)
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    return binary
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def version_hex(version_string):
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    """Convert a Dovecot version, e.g.: '1.2.3' or '2.0.beta4', to an int.
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    Returns 0 if the *version_string* has the wrong™ format.
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    version_hex('1.2.3') -> 16909296
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    hex(version_hex('1.2.3')) -> '0x10203f0'
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    """
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    version = 0
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    version_re = r'^(\d+)\.(\d+)\.(?:(\d+)|(alpha|beta|rc)(\d+))$'
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    version_level = dict(alpha=0xA, beta=0xB, rc=0xC)
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    version_mo = re.match(version_re, version_string)
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    if version_mo:
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        major, minor, patch, level, serial = version_mo.groups()
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        version += int(major) << 24
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        version += int(minor) << 16
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        if patch:
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            version += int(patch) << 8
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        version += version_level.get(level, 0xF) << 4
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        if serial:
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            version += int(serial)
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    return version
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del _