554081498d
Listing VM properties require specific object, so instead of collecting all properties from all VMs (which may be denied by policy), simply try to access properties (and display '-' when it fails). QubesOS/qubes-issues#853
574 lines
16 KiB
Python
574 lines
16 KiB
Python
# pylint: disable=too-few-public-methods
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#
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# The Qubes OS Project, https://www.qubes-os.org/
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#
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# Copyright (C) 2015 Joanna Rutkowska <joanna@invisiblethingslab.com>
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# Copyright (C) 2015 Wojtek Porczyk <woju@invisiblethingslab.com>
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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 2 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 along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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'''qvm-ls - List available domains'''
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from __future__ import print_function
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import argparse
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import collections
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import sys
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import textwrap
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import qubesmgmt
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import qubesmgmt.tools
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import qubesmgmt.utils
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#
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# columns
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#
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class Column(object):
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'''A column in qvm-ls output characterised by its head, a width and a way
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to fetch a parameter describing the domain.
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:param str head: Column head (usually uppercase).
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:param int width: Column width.
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:param str attr: Attribute, possibly complex (containing ``.``). This may \
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also be a callable that gets as its only argument the domain.
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:param str doc: Description of column (will be visible in --help-columns).
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'''
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#: collection of all columns
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columns = {}
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def __init__(self, head, width=0, attr=None, doc=None):
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self.ls_head = head
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self.ls_width = max(width, len(self.ls_head) + 1)
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self.__doc__ = doc if doc is None else qubesmgmt.utils.format_doc(doc)
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# intentionally not always do set self._attr,
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# to cause AttributeError in self.format()
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if attr is not None:
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self._attr = attr
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self.__class__.columns[self.ls_head] = self
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def cell(self, vm):
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'''Format one cell.
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.. note::
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This is only for technical formatting (filling with space). If you
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want to subclass the :py:class:`Column` class, you should override
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:py:meth:`Column.format` method instead.
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:param qubes.vm.qubesvm.QubesVM: Domain to get a value from.
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:returns: string that is at least as wide as needed to fill table row.
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:rtype: str
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'''
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value = self.format(vm) or '-'
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return value.ljust(self.ls_width)
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def format(self, vm):
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'''Format one cell value.
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Return value to put in a table cell.
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:param qubes.vm.qubesvm.QubesVM: Domain to get a value from.
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:returns: Value to put, or :py:obj:`None` if no value.
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:rtype: str or None
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'''
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ret = None
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try:
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if isinstance(self._attr, str):
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ret = vm
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for attrseg in self._attr.split('.'):
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ret = getattr(ret, attrseg)
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elif isinstance(self._attr, collections.Callable):
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ret = self._attr(vm)
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except (AttributeError, ZeroDivisionError):
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# division by 0 may be caused by arithmetic in callable attr
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return None
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if ret is None:
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return None
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if isinstance(ret, int):
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return str(ret)
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return ret
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def __repr__(self):
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return '{}(head={!r}, width={!r})'.format(self.__class__.__name__,
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self.ls_head, self.ls_width)
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def __eq__(self, other):
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return self.ls_head == other.ls_head
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def __lt__(self, other):
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return self.ls_head < other.ls_head
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class PropertyColumn(Column):
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'''Column that displays value from property (:py:class:`property` or
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:py:class:`qubes.property`) of domain.
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:param name: Name of VM property.
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'''
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def __init__(self, name):
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ls_head = name.replace('_', '-').upper()
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super(PropertyColumn, self).__init__(
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head=ls_head,
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attr=name)
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def __repr__(self):
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return '{}(head={!r}'.format(
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self.__class__.__name__,
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self.ls_head)
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def process_vm(vm):
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'''Process VM object to find all listable properties.
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:param qubesmgmt.vm.QubesVM vm: VM object.
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'''
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for prop_name in vm.property_list():
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PropertyColumn(prop_name)
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def flag(field):
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'''Mark method as flag field.
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:param int field: Which field to fill (counted from 1)
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'''
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def decorator(obj):
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# pylint: disable=missing-docstring
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obj.field = field
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return obj
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return decorator
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def simple_flag(field, letter, attr, doc=None):
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'''Create simple, binary flag.
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:param str attr: Attribute name to check. If result is true, flag is fired.
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:param str letter: The letter to show.
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'''
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def helper(self, vm):
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# pylint: disable=missing-docstring,unused-argument
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try:
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value = getattr(vm, attr)
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except AttributeError:
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value = False
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if value:
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return letter[0]
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helper.__doc__ = doc
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helper.field = field
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return helper
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class StatusColumn(Column):
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'''Some fancy flags that describe general status of the domain.'''
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# pylint: disable=no-self-use
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def __init__(self):
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super(StatusColumn, self).__init__(
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head='STATUS',
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width=len(self.get_flags()) + 1,
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doc=self.__class__.__doc__)
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@flag(1)
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def type(self, vm):
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'''Type of domain.
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0 AdminVM (AKA Dom0)
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aA AppVM
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dD DisposableVM
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sS StandaloneVM
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tT TemplateVM
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When it is HVM (optimised VM), the letter is capital.
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'''
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# late import because of circular dependency
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# pylint: disable=redefined-outer-name
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import qubes.vm
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import qubes.vm.adminvm
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import qubes.vm.appvm
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import qubes.vm.dispvm
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import qubes.vm.qubesvm
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import qubes.vm.templatevm
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if isinstance(vm, qubes.vm.adminvm.AdminVM):
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return '0'
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ret = None
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# TODO right order, depending on inheritance
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if isinstance(vm, qubes.vm.templatevm.TemplateVM):
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ret = 't'
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if isinstance(vm, qubes.vm.appvm.AppVM):
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ret = 'a'
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# if isinstance(vm, qubes.vm.standalonevm.StandaloneVM):
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# ret = 's'
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if isinstance(vm, qubes.vm.dispvm.DispVM):
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ret = 'd'
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if ret is not None:
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if getattr(vm, 'hvm', False):
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return ret.upper()
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else:
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return ret
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@flag(2)
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def power(self, vm):
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'''Current power state.
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r running
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t transient
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p paused
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s suspended
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h halting
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d dying
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c crashed
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? unknown
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'''
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state = vm.get_power_state().lower()
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if state == 'unknown':
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return '?'
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elif state in ('running', 'transient', 'paused', 'suspended',
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'halting', 'dying', 'crashed'):
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return state[0]
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updateable = simple_flag(3, 'U', 'updateable',
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doc='If the domain is updateable.')
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provides_network = simple_flag(4, 'N', 'provides_network',
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doc='If the domain provides network.')
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installed_by_rpm = simple_flag(5, 'R', 'installed_by_rpm',
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doc='If the domain is installed by RPM.')
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internal = simple_flag(6, 'i', 'internal',
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doc='If the domain is internal (not normally shown, no appmenus).')
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debug = simple_flag(7, 'D', 'debug',
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doc='If the domain is being debugged.')
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autostart = simple_flag(8, 'A', 'autostart',
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doc='If the domain is marked for autostart.')
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# TODO (not sure if really):
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# include in backups
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# uses_custom_config
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def _no_flag(self, vm):
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'''Reserved for future use.'''
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@classmethod
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def get_flags(cls):
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'''Get all flags as list.
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Holes between flags are filled with :py:meth:`_no_flag`.
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:rtype: list
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'''
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flags = {}
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for mycls in cls.__mro__:
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for attr in mycls.__dict__.values():
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if not hasattr(attr, 'field'):
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continue
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if attr.field in flags:
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continue
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flags[attr.field] = attr
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return [(flags[i] if i in flags else cls._no_flag)
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for i in range(1, max(flags) + 1)]
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def format(self, vm):
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return ''.join((flag(self, vm) or '-') for flag in self.get_flags())
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def calc_size(vm, volume_name):
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''' Calculates the volume size in MB '''
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try:
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return vm.volumes[volume_name].size // 1024 // 1024
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except KeyError:
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return 0
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def calc_usage(vm, volume_name):
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''' Calculates the volume usage in MB '''
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try:
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return vm.volumes[volume_name].usage // 1024 // 1024
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except KeyError:
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return 0
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def calc_used(vm, volume_name):
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''' Calculates the volume usage in percent '''
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size = calc_size(vm, volume_name)
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if size == 0:
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return 0
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usage = calc_usage(vm, volume_name)
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return usage * 100 // size
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# todo maxmem
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Column('GATEWAY', width=15,
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attr='netvm.gateway',
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doc='Network gateway.')
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Column('MEMORY', width=5,
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attr=(lambda vm: vm.get_mem() / 1024 if vm.is_running() else None),
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doc='Memory currently used by VM')
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Column('DISK', width=5,
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attr=(lambda vm: vm.storage.get_disk_utilization() / 1024 / 1024),
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doc='Total disk utilisation.')
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Column('PRIV-CURR', width=5,
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attr=(lambda vm: calc_usage(vm, 'private')),
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doc='Disk utilisation by private image (/home, /usr/local).')
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Column('PRIV-MAX', width=5,
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attr=(lambda vm: calc_size(vm, 'private')),
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doc='Maximum available space for private image.')
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Column('PRIV-USED', width=5,
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attr=(lambda vm: calc_used(vm, 'private')),
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doc='Disk utilisation by private image as a percentage of available space.')
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Column('ROOT-CURR', width=5,
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attr=(lambda vm: calc_usage(vm, 'root')),
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doc='Disk utilisation by root image (/usr, /lib, /etc, ...).')
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Column('ROOT-MAX', width=5,
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attr=(lambda vm: calc_size(vm, 'root')),
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doc='Maximum available space for root image.')
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Column('ROOT-USED', width=5,
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attr=(lambda vm: calc_used(vm, 'root')),
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doc='Disk utilisation by root image as a percentage of available space.')
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StatusColumn()
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class Table(object):
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'''Table that is displayed to the user.
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:param qubes.Qubes app: Qubes application object.
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:param list colnames: Names of the columns (need not to be uppercase).
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'''
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def __init__(self, app, colnames, raw_data=False):
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self.app = app
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self.columns = tuple(Column.columns[col.upper()] for col in colnames)
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self.raw_data = raw_data
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def format_head(self):
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'''Format table head (all column heads).'''
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return ''.join('{head:{width}s}'.format(
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head=col.ls_head, width=col.ls_width)
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for col in self.columns[:-1]) + \
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self.columns[-1].ls_head
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def format_row(self, vm):
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'''Format single table row (all columns for one domain).'''
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if self.raw_data:
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return '|'.join(col.format(vm) for col in self.columns)
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else:
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return ''.join(col.cell(vm) for col in self.columns)
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def write_table(self, stream=sys.stdout):
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'''Write whole table to file-like object.
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:param file stream: Stream to write the table to.
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'''
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if not self.raw_data:
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stream.write(self.format_head() + '\n')
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for vm in self.app.domains:
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stream.write(self.format_row(vm) + '\n')
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#: Available formats. Feel free to plug your own one.
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formats = {
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'simple': ('name', 'status', 'label', 'template', 'netvm'),
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'network': ('name', 'status', 'netvm', 'ip', 'ipback', 'gateway'),
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'full': ('name', 'status', 'label', 'qid', 'xid', 'uuid'),
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# 'perf': ('name', 'status', 'cpu', 'memory'),
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'disk': ('name', 'status', 'disk',
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'priv-curr', 'priv-max', 'priv-used',
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'root-curr', 'root-max', 'root-used'),
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}
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class _HelpColumnsAction(argparse.Action):
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'''Action for argument parser that displays all columns and exits.'''
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# pylint: disable=redefined-builtin
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def __init__(self,
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option_strings,
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dest=argparse.SUPPRESS,
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default=argparse.SUPPRESS,
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help='list all available columns with short descriptions and exit'):
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super(_HelpColumnsAction, self).__init__(
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option_strings=option_strings,
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dest=dest,
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default=default,
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nargs=0,
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help=help)
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def __call__(self, parser, namespace, values, option_string=None):
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width = max(len(column.ls_head) for column in Column.columns.values())
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wrapper = textwrap.TextWrapper(width=80,
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initial_indent=' ', subsequent_indent=' ' * (width + 6))
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text = 'Available columns:\n' + '\n'.join(
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wrapper.fill('{head:{width}s} {doc}'.format(
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head=column.ls_head,
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doc=column.__doc__ or '',
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width=width))
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for column in sorted(Column.columns.values()))
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parser.exit(message=text + '\n')
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class _HelpFormatsAction(argparse.Action):
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'''Action for argument parser that displays all formats and exits.'''
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# pylint: disable=redefined-builtin
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def __init__(self,
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option_strings,
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dest=argparse.SUPPRESS,
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default=argparse.SUPPRESS,
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help='list all available formats with their definitions and exit'):
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super(_HelpFormatsAction, self).__init__(
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option_strings=option_strings,
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dest=dest,
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default=default,
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nargs=0,
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help=help)
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def __call__(self, parser, namespace, values, option_string=None):
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width = max(len(fmt) for fmt in formats)
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text = 'Available formats:\n' + ''.join(
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' {fmt:{width}s} {columns}\n'.format(
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fmt=fmt, columns=','.join(formats[fmt]).upper(), width=width)
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for fmt in sorted(formats))
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parser.exit(message=text)
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def get_parser():
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'''Create :py:class:`argparse.ArgumentParser` suitable for
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:program:`qvm-ls`.
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'''
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# parser creation is delayed to get all the columns that are scattered
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# thorough the modules
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wrapper = textwrap.TextWrapper(width=80, break_on_hyphens=False,
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initial_indent=' ', subsequent_indent=' ')
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parser = qubesmgmt.tools.QubesArgumentParser(
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formatter_class=argparse.RawTextHelpFormatter,
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description='List Qubes domains and their parametres.',
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epilog='available formats (see --help-formats):\n{}\n\n'
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'available columns (see --help-columns):\n{}'.format(
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wrapper.fill(', '.join(sorted(formats.keys()))),
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wrapper.fill(', '.join(sorted(sorted(Column.columns.keys()))))))
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parser.add_argument('--help-columns', action=_HelpColumnsAction)
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parser.add_argument('--help-formats', action=_HelpFormatsAction)
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parser_formats = parser.add_mutually_exclusive_group()
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parser_formats.add_argument('--format', '-o', metavar='FORMAT',
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action='store', choices=formats.keys(), default='simple',
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help='preset format')
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parser_formats.add_argument('--fields', '-O', metavar='FIELD,...',
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action='store',
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help='user specified format (see available columns below)')
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parser.add_argument('--raw-data', action='store_true',
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help='Display specify data of specified VMs. Intended for '
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'bash-parsing.')
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# parser.add_argument('--conf', '-c',
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# action='store', metavar='CFGFILE',
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# help='Qubes config file')
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return parser
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def main(args=None):
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'''Main routine of :program:`qvm-ls`.
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:param list args: Optional arguments to override those delivered from \
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command line.
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'''
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parser = get_parser()
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try:
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args = parser.parse_args(args)
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except qubesmgmt.exc.QubesException as e:
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parser.print_error(str(e))
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return 1
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if args.fields:
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columns = [col.strip() for col in args.fields.split(',')]
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for col in columns:
|
|
if col.upper() not in Column.columns:
|
|
parser.error('no such column: {!r}'.format(col))
|
|
else:
|
|
columns = formats[args.format]
|
|
|
|
# assume unknown columns are VM properties
|
|
for col in columns:
|
|
if col.upper() not in Column.columns:
|
|
PropertyColumn(col)
|
|
|
|
table = Table(args.app, columns)
|
|
table.write_table(sys.stdout)
|
|
|
|
return 0
|
|
|
|
|
|
if __name__ == '__main__':
|
|
sys.exit(main())
|