Gestionnaire de fichiers - Editer - /usr/lib/python2.7/site-packages/vdo/vdomgmnt/SizeString.py
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# # Copyright (c) 2018 Red Hat, Inc. # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; either version 2 # of the License, or (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301, USA. # """ SizeString - LVM-style size strings $Id: //eng/vdo-releases/magnesium/src/python/vdo/vdomgmnt/SizeString.py#1 $ """ import locale from . import Constants class SizeString(object): """Represents the size of an object such as a disk partition. Conversions are provided to and from suffixed size strings as used by LVM commands like lvcreate(8). These strings consist of a (possibly floating-point) number followed by an optional unit suffix: B (bytes), S (512-byte sectors), and KMGTPE for kilobytes through exabytes, respectively. Suffixes are not case-sensitive; the default unit is Megabytes. Currently, we reject negative sizes. Unlike some (but not all) LVM commands we do not interpret the upper-case version of a suffix as a power of ten. Attributes: _originalString (str): the original string we were constructed with, mainly used for debugging _bytes (int): the value of this object in bytes """ ###################################################################### # Public methods ###################################################################### def __add__(self, rhs): retval = SizeString("") retval._bytes = self._bytes + int(rhs) return retval ###################################################################### def __bool__(self): return self._bytes != 0 ###################################################################### def __cmp__(self, rhs): result = 0 if not isinstance(rhs, SizeString): result = NotImplemented else: result = cmp(self._bytes, rhs.toBytes()) return result ###################################################################### def __iadd__(self, rhs): self._bytes += int(rhs) return self ###################################################################### def __int__(self): return self._bytes ###################################################################### def __nonzero__(self): return self.__bool__() ###################################################################### def asLvmText(self): """Returns this object as a size string without a decimal point.""" suffix = Constants.lvmDefaultSuffix size = self._bytes if size > 0: for click in Constants.lvmSiSuffixes[::-1]: divisor = Constants.lvmSiSuffixSizeMap[click] if size % divisor == 0: size = size // divisor suffix = click break else: suffix = Constants.lvmByteSuffix return str(size) + suffix.upper() ###################################################################### def roundToBlock(self): """Rounds this object down to a multiple of the block size.""" self._bytes = self.toBlocks() * Constants.VDO_BLOCK_SIZE return self ###################################################################### def toBlocks(self): """Returns this object as a count of 4K blocks, rounding down.""" return (self._bytes // Constants.VDO_BLOCK_SIZE) ###################################################################### def toBytes(self): """Returns the count of bytes represented by this object.""" return self._bytes ###################################################################### def toSectors(self): """Returns this object as a count of 512-byte sectors, rounding up.""" bytesPerSector = Constants.lvmSuffixSizeMap[Constants.lvmSectorSuffix] return (self._bytes + (bytesPerSector - 1)) / bytesPerSector ###################################################################### # Overridden methods ###################################################################### def __init__(self, sz): self._originalString = sz if sz: try: suffix = sz[-1:].lower() if suffix in Constants.lvmSuffixes: nbytes = self._atof(sz[:-1]) else: nbytes = self._atof(sz) suffix = Constants.lvmDefaultSuffix except ValueError: raise ValueError(_("invalid size string \"{size}\"").format(size=sz)) nbytes *= float(Constants.lvmSuffixSizeMap[suffix]) self._bytes = int(nbytes) if self._bytes < 0: raise ValueError(_("invalid size string \"{size}\"").format(size=sz)) else: self._bytes = 0 ###################################################################### def __repr__(self): return "{0} ({1}{2})".format(self._originalString, self._bytes, Constants.lvmByteSuffix.upper()) ###################################################################### def __str__(self): return self.asLvmText() ###################################################################### # Protected methods ###################################################################### @staticmethod def _atof(s): """Tries to convert a float using the current LC_NUMERIC settings. If something goes wrong, tries float(). """ try: return locale.atof(s) except Exception: return float(s)
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