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#! /usr/bin/python2.4
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#
# Copyright 2009 Sun Microsystems, Inc. All rights reserved.
# Use is subject to license terms.
#
"""This module provides utility functions for ZFS.
zfs.util.dev -- a file object of /dev/zfs """
import gettext
import errno
import os
# Note: this module (zfs.util) should not import zfs.ioctl, because that
# would introduce a circular dependency
errno.ECANCELED = 47
errno.ENOTSUP = 48
dev = open("/dev/zfs", "w")
_ = gettext.translation("SUNW_OST_OSLIB", "/usr/lib/locale",
fallback=True).gettext
def default_repr(self):
"""A simple __repr__ function."""
if self.__slots__:
str = "<" + self.__class__.__name__
for v in self.__slots__:
str += " %s: %r" % (v, getattr(self, v))
return str + ">"
else:
return "<%s %s>" % \
(self.__class__.__name__, repr(self.__dict__))
class ZFSError(StandardError):
"""This exception class represents a potentially user-visible
ZFS error. If uncaught, it will be printed and the process will
exit with exit code 1.
errno -- the error number (eg, from ioctl(2))."""
__slots__ = "why", "task", "errno"
__repr__ = default_repr
def __init__(self, eno, task=None, why=None):
"""Create a ZFS exception.
eno -- the error number (errno)
task -- a string describing the task that failed
why -- a string describing why it failed (defaults to
strerror(eno))"""
self.errno = eno
self.task = task
self.why = why
def __str__(self):
s = ""
if self.task:
s += self.task + ": "
if self.why:
s += self.why
else:
s += self.strerror
return s
__strs = {
errno.EPERM: _("permission denied"),
errno.ECANCELED:
_("delegated administration is disabled on pool"),
errno.EINTR: _("signal received"),
errno.EIO: _("I/O error"),
errno.ENOENT: _("dataset does not exist"),
errno.ENOSPC: _("out of space"),
errno.EEXIST: _("dataset already exists"),
errno.EBUSY: _("dataset is busy"),
errno.EROFS:
_("snapshot permissions cannot be modified"),
errno.ENAMETOOLONG: _("dataset name is too long"),
errno.ENOTSUP: _("unsupported version"),
errno.EAGAIN: _("pool I/O is currently suspended"),
}
__strs[errno.EACCES] = __strs[errno.EPERM]
__strs[errno.ENXIO] = __strs[errno.EIO]
__strs[errno.ENODEV] = __strs[errno.EIO]
__strs[errno.EDQUOT] = __strs[errno.ENOSPC]
@property
def strerror(self):
return ZFSError.__strs.get(self.errno, os.strerror(self.errno))
def nicenum(num):
"""Return a nice string (eg "1.23M") for this integer."""
index = 0;
n = num;
while n >= 1024:
n /= 1024
index += 1
u = " KMGTPE"[index]
if index == 0:
return "%u" % n;
elif n >= 100 or num & ((1024*index)-1) == 0:
# it's an exact multiple of its index, or it wouldn't
# fit as floating point, so print as an integer
return "%u%c" % (n, u)
else:
# due to rounding, it's tricky to tell what precision to
# use; try each precision and see which one fits
for i in (2, 1, 0):
s = "%.*f%c" % (i, float(num) / (1<<(10*index)), u)
if len(s) <= 5:
return s
def append_with_opt(option, opt, value, parser):
"""A function for OptionParser which appends a tuple (opt, value)."""
getattr(parser.values, option.dest).append((opt, value))
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