finishing restart_net.py
This commit is contained in:
parent
c0df7dabe1
commit
50d2f7138e
GPG Key ID:
8C004C2F93481F6B
223
better_virsh.py
Executable file
223
better_virsh.py
Executable file
@ -0,0 +1,223 @@
|
||||
#!/usr/bin/env python3
|
||||
|
||||
import argparse
|
||||
# import os
|
||||
# import getpass
|
||||
import re
|
||||
##
|
||||
import libvirt
|
||||
# from lxml import etree
|
||||
|
||||
# NOTE: docs URLS are super long. Extrapolate using following:
|
||||
# docsurl = 'https://libvirt.org/docs/libvirt-appdev-guide-python/en-US/html'
|
||||
|
||||
# TODO: flesh this out. only supports guests atm
|
||||
# TODO: use openAuth?
|
||||
# {docsurl}/libvirt_application_development_guide_using_python-Connections.html#idp13928160
|
||||
|
||||
# I would like to take the moment to point out that I did in three hours with exactly NO prior knowledge of the libvirt
|
||||
# API what Red Hat couldn't do in four YEARS. https://bugzilla.redhat.com/show_bug.cgi?id=1244093
|
||||
|
||||
|
||||
def libvirt_callback(userdata, err):
|
||||
# fucking worst design decision.
|
||||
# https://stackoverflow.com/a/45543887/733214
|
||||
pass
|
||||
|
||||
|
||||
# fucking worst design decision.
|
||||
# https://stackoverflow.com/a/45543887/733214
|
||||
libvirt.registerErrorHandler(f = libvirt_callback, ctx = None)
|
||||
|
||||
|
||||
class LV(object):
|
||||
def __init__(self, uri, *args, **kwargs):
|
||||
self.uri = uri
|
||||
self.conn = None
|
||||
self._args = args
|
||||
self._kwargs = kwargs
|
||||
|
||||
def _getTargets(self, target, regex = False, ttype = 'guest',
|
||||
state = None, nocase = False, *args, **kwargs):
|
||||
targets = []
|
||||
# TODO: ..._RUNNING as well? can add multiple flags
|
||||
state_flags = {'guest': (libvirt.VIR_CONNECT_LIST_DOMAINS_ACTIVE,
|
||||
libvirt.VIR_CONNECT_LIST_DOMAINS_INACTIVE),
|
||||
'net': (libvirt.VIR_CONNECT_LIST_NETWORKS_ACTIVE,
|
||||
libvirt.VIR_CONNECT_LIST_NETWORKS_INACTIVE),
|
||||
'storage': (libvirt.VIR_CONNECT_LIST_STORAGE_POOLS_ACTIVE,
|
||||
libvirt.VIR_CONNECT_LIST_STORAGE_POOLS_INACTIVE)}
|
||||
re_flags = re.UNICODE # The default
|
||||
if nocase:
|
||||
re_flags += re.IGNORECASE
|
||||
if not self.conn:
|
||||
self.startConn()
|
||||
search_funcs = {'guest': self.conn.listAllDomains,
|
||||
'net': self.conn.listAllNetworks,
|
||||
'storage': self.conn.listAllStoragePools}
|
||||
if not regex:
|
||||
ptrn = r'^{0}$'.format(target)
|
||||
else:
|
||||
ptrn = target
|
||||
ptrn = re.compile(ptrn, re_flags)
|
||||
if state == 'active':
|
||||
flag = state_flags[ttype][0]
|
||||
elif state == 'inactive':
|
||||
flag = state_flags[ttype][1]
|
||||
else:
|
||||
flag = 0
|
||||
for t in search_funcs[ttype](flag):
|
||||
if ptrn.search(t.name()):
|
||||
targets.append(t)
|
||||
targets.sort(key = lambda i: i.name())
|
||||
return(targets)
|
||||
|
||||
def list(self, target, verbose = False, *args, **kwargs):
|
||||
# {docsurl}/libvirt_application_development_guide_using_python-Guest_Domains-Information-Info.html
|
||||
if not self.conn:
|
||||
self.startConn()
|
||||
targets = self._getTargets(target, **kwargs)
|
||||
results = []
|
||||
# Each attr is a tuple; the name of the attribute and the key name the result should use (if defined)
|
||||
attr_map = {'str': (('name', None),
|
||||
('OSType', 'os'),
|
||||
('UUIDString', 'uuid'),
|
||||
('hostname', None)),
|
||||
'bool': (('autostart', None),
|
||||
('hasCurrentSnapshot', 'current_snapshot'),
|
||||
('hasManagedSaveImage', 'managed_save_image'),
|
||||
('isActive', 'active'),
|
||||
('isPersistent', 'persistent'),
|
||||
('isUpdated', 'updated')),
|
||||
'int': (('ID', 'id'),
|
||||
('maxMemory', 'max_memory_KiB'),
|
||||
('maxVcpus', 'max_vCPUs'))}
|
||||
for t in targets:
|
||||
if not verbose:
|
||||
results.append(t.name())
|
||||
else:
|
||||
r = {}
|
||||
for attrname, newkey in attr_map['str']:
|
||||
keyname = (newkey if newkey else attrname)
|
||||
try:
|
||||
r[keyname] = str(getattr(t, attrname)())
|
||||
except libvirt.libvirtError:
|
||||
r[keyname] = '(N/A)'
|
||||
for attrname, newkey in attr_map['bool']:
|
||||
keyname = (newkey if newkey else attrname)
|
||||
try:
|
||||
r[keyname] = bool(getattr(t, attrname)())
|
||||
except (libvirt.libvirtError, ValueError):
|
||||
r[keyname] = None
|
||||
for attrname, newkey in attr_map['int']:
|
||||
keyname = (newkey if newkey else attrname)
|
||||
try:
|
||||
r[keyname] = int(getattr(t, attrname)())
|
||||
if r[keyname] == -1:
|
||||
r[keyname] = None
|
||||
except (libvirt.libvirtError, ValueError):
|
||||
r[keyname] = None
|
||||
results.append(r)
|
||||
return(results)
|
||||
|
||||
def restart(self, target, *args, **kwargs):
|
||||
self.stop(target, state = 'active', **kwargs)
|
||||
self.start(target, state = 'inactive', **kwargs)
|
||||
return()
|
||||
|
||||
def start(self, target, **kwargs):
|
||||
if not self.conn:
|
||||
self.startConn()
|
||||
targets = self._getTargets(target, state = 'inactive', **kwargs)
|
||||
for t in targets:
|
||||
t.create()
|
||||
return()
|
||||
|
||||
def stop(self, target, force = False, *args, **kwargs):
|
||||
if not self.conn:
|
||||
self.startConn()
|
||||
targets = self._getTargets(target, state = 'active', **kwargs)
|
||||
for t in targets:
|
||||
if not force:
|
||||
t.shutdown()
|
||||
else:
|
||||
t.destroy()
|
||||
return ()
|
||||
|
||||
def startConn(self):
|
||||
self.conn = libvirt.open(self.uri)
|
||||
return()
|
||||
|
||||
def stopConn(self):
|
||||
if self.conn:
|
||||
self.conn.close()
|
||||
self.conn = None
|
||||
return()
|
||||
|
||||
|
||||
def parseArgs():
|
||||
args = argparse.ArgumentParser(description = 'Some better handling of libvirt guests')
|
||||
common_args = argparse.ArgumentParser(add_help = False)
|
||||
common_args.add_argument('-u', '--uri',
|
||||
dest = 'uri',
|
||||
default = 'qemu:///system',
|
||||
help = 'The URI for the libvirt to connect to. Default: qemu:///system')
|
||||
common_args.add_argument('-r', '--regex',
|
||||
action = 'store_true',
|
||||
help = 'If specified, use a regex pattern for TARGET instead of exact match')
|
||||
common_args.add_argument('-i', '--case-insensitive',
|
||||
action = 'store_true',
|
||||
dest = 'nocase',
|
||||
help = 'If specified, match the target name/regex pattern case-insensitive')
|
||||
common_args.add_argument('-T', '--target-type',
|
||||
# choices = ['guest', 'net', 'storage'],
|
||||
choices = ['guest'],
|
||||
default = 'guest',
|
||||
dest = 'ttype',
|
||||
help = 'The type of TARGET')
|
||||
common_args.add_argument('-t', '--target',
|
||||
dest = 'target',
|
||||
metavar = 'TARGET',
|
||||
default = '.*',
|
||||
help = ('The guest, network, etc. to manage. '
|
||||
'If not specified, operate on all (respecting other filtering)'))
|
||||
subparsers = args.add_subparsers(help = 'Operation to perform',
|
||||
dest = 'oper',
|
||||
metavar = 'OPERATION',
|
||||
required = True)
|
||||
start_args = subparsers.add_parser('start', help = 'Start the target(s)', parents = [common_args])
|
||||
restart_args = subparsers.add_parser('restart', help = 'Restart the target(s)', parents = [common_args])
|
||||
stop_args = subparsers.add_parser('stop', help = 'Stop ("destroy") the target(s)', parents = [common_args])
|
||||
stop_args.add_argument('-f', '--force',
|
||||
dest = 'force',
|
||||
action = 'store_true',
|
||||
help = 'Hard poweroff instead of send a shutdown/ACPI powerdown signal')
|
||||
list_args = subparsers.add_parser('list', help = 'List the target(s)', parents = [common_args])
|
||||
list_args.add_argument('-v', '--verbose',
|
||||
dest = 'verbose',
|
||||
action = 'store_true',
|
||||
help = 'Display more output')
|
||||
list_args.add_argument('-s', '--state',
|
||||
dest = 'state',
|
||||
choices = ['active', 'inactive'],
|
||||
default = None,
|
||||
help = 'Filter results by state. Default is all states')
|
||||
return(args)
|
||||
|
||||
|
||||
def main():
|
||||
args = parseArgs().parse_args()
|
||||
varargs = vars(args)
|
||||
lv = LV(**varargs)
|
||||
f = getattr(lv, args.oper)(**varargs)
|
||||
if args.oper == 'list':
|
||||
if args.verbose:
|
||||
import json
|
||||
print(json.dumps(f, indent = 4, sort_keys = True))
|
||||
else:
|
||||
print('\n'.join(f))
|
||||
return()
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
main()
|
||||
162
restart_net.py
Executable file
162
restart_net.py
Executable file
@ -0,0 +1,162 @@
|
||||
#!/usr/bin/env python3
|
||||
|
||||
import argparse
|
||||
import time
|
||||
import uuid
|
||||
##
|
||||
import libvirt
|
||||
from lxml import etree
|
||||
|
||||
|
||||
# The next dummy function and proceeding statement are because of the fucking worst design decisions.
|
||||
# https://stackoverflow.com/a/45543887/733214
|
||||
def libvirt_callback(userdata, err):
|
||||
pass
|
||||
|
||||
|
||||
libvirt.registerErrorHandler(f = libvirt_callback, ctx = None)
|
||||
|
||||
|
||||
# Defaults.
|
||||
_def_uri = 'qemu:///system'
|
||||
_def_rsrt_guests = True
|
||||
|
||||
# "Ignore" these libvirt.libvirtError codes in shutdown attempts.
|
||||
#
|
||||
_lv_err_pass = (86, 8)
|
||||
|
||||
|
||||
class DomainNetwork(object):
|
||||
def __init__(self, dom):
|
||||
# dom is a libvirt.virDomain (or whatever it's called) instance.
|
||||
self.dom = dom
|
||||
self.dom_xml = etree.fromstring(dom.XMLDesc())
|
||||
self.ifaces = []
|
||||
|
||||
def get_nets(self, netnames):
|
||||
for iface in self.dom_xml.xpath('devices/interface'):
|
||||
if iface.attrib.get('type') == 'network':
|
||||
src_xml = iface.find('source')
|
||||
if src_xml and src_xml.attrib.get('network') in netnames:
|
||||
# Why, oh why, does the libvirt API want the XML??
|
||||
self.ifaces.append(etree.tostring(iface).decode('utf-8'))
|
||||
return(None)
|
||||
|
||||
|
||||
class VMManager(object):
|
||||
def __init__(self, netname, restart_guests = True, uri = _def_uri, *args, **kwargs):
|
||||
self.netname = netname
|
||||
self.restart_guests = restart_guests
|
||||
self.uri = uri
|
||||
self.networks = []
|
||||
self._listonly = True
|
||||
self.conn = None
|
||||
self._connect()
|
||||
self._get_networks()
|
||||
if self.netname:
|
||||
self._listonly = False
|
||||
self.networks = [i for i in self.networks if i.name() == self.netname]
|
||||
self.errs = []
|
||||
|
||||
def _connect(self):
|
||||
if self.conn:
|
||||
return(None)
|
||||
self.conn = libvirt.open(self.uri)
|
||||
return(None)
|
||||
|
||||
def _disconnect(self):
|
||||
if not self.conn:
|
||||
return(None)
|
||||
self.conn.close()
|
||||
self.conn = None
|
||||
return(None)
|
||||
|
||||
def _get_networks(self):
|
||||
self._connect()
|
||||
self.networks = self.conn.listAllNetworks(flags = libvirt.VIR_CONNECT_LIST_NETWORKS_ACTIVE)
|
||||
self.networks.sort(key = lambda i: i.name())
|
||||
self._disconnect()
|
||||
return(None)
|
||||
|
||||
def restart(self):
|
||||
if self._listonly:
|
||||
return(False)
|
||||
self._connect()
|
||||
doms = {}
|
||||
netnames = [i.name() for i in self.networks]
|
||||
# https://libvirt.org/html/libvirt-libvirt-domain.html#virConnectListAllDomains
|
||||
# _flags = (libvirt.VIR_CONNECT_LIST_DOMAINS_ACTIVE | libvirt.VIR_CONNECT_LIST_DOMAINS_RUNNING)
|
||||
_findflags = libvirt.VIR_CONNECT_LIST_DOMAINS_RUNNING
|
||||
# https://libvirt.org/html/libvirt-libvirt-domain.html#virDomainDetachDeviceFlags
|
||||
# https://libvirt.org/html/libvirt-libvirt-domain.html#virDomainAttachDeviceFlags
|
||||
# TODO: actually use _CURRENT?
|
||||
_ifaceflags = (libvirt.VIR_DOMAIN_AFFECT_LIVE | libvirt.VIR_DOMAIN_AFFECT_CURRENT)
|
||||
for dom in self.conn.listAllDomains(flags = _findflags):
|
||||
domnet = DomainNetwork(dom)
|
||||
domnet.get_nets(netnames)
|
||||
if dom.ifaces:
|
||||
doms[uuid.UUID(bytes = dom.UUID())] = domnet
|
||||
for n in self.networks:
|
||||
n.destroy()
|
||||
n.create()
|
||||
for dom_uuid, domnet in doms.items():
|
||||
for iface_xml in domnet.ifaces:
|
||||
# Nice that we don't actually need to shut the machine down.
|
||||
# Here be dragons, though, if the OS doesn't understand NIC hotplugging.
|
||||
domnet.dom.detachDeviceFlags(iface_xml, flags = _ifaceflags)
|
||||
domnet.dom.attachDeviceFlags(iface_xml, flags = _ifaceflags)
|
||||
self._disconnect()
|
||||
if not doms:
|
||||
doms = None
|
||||
return(doms)
|
||||
|
||||
def print_nets(self):
|
||||
max_name = len(max([i.name() for i in self.networks], key = len)) + 2
|
||||
hdr = '| Name{0} | Active | Persistent |'.format((' ' * (max_name - 6)))
|
||||
sep = '-' * len(hdr)
|
||||
print(sep)
|
||||
print(hdr)
|
||||
print(sep)
|
||||
vmtpl = '| {{name:<{0}}} | {{isActive}} | {{isPersistent}} |'.format((max_name - 2))
|
||||
for n in self.networks:
|
||||
vals = {}
|
||||
for i in ('name', 'isActive', 'isPersistent'):
|
||||
v = getattr(n, i)
|
||||
v = v()
|
||||
if isinstance(v, int):
|
||||
v = ('Y' if v else 'N')
|
||||
vals[i] = v
|
||||
print(vmtpl.format(**vals))
|
||||
print(sep)
|
||||
return(None)
|
||||
|
||||
|
||||
def parseArgs():
|
||||
args = argparse.ArgumentParser(description = 'Restart a network and all associated guests ("domains")')
|
||||
args.add_argument('-u', '--uri',
|
||||
dest = 'uri',
|
||||
default = _def_uri,
|
||||
help = ('The URI to use for which libvirt to connect to. '
|
||||
'Default: {0}').format(_def_uri))
|
||||
args.add_argument('-n', '--no-guests',
|
||||
action = 'store_false',
|
||||
dest = 'restart_guests',
|
||||
help = ('If specified, suppress rebooting guests and only restart the network'))
|
||||
args.add_argument('netname',
|
||||
metavar = 'NETWORK_NAME',
|
||||
nargs = '?',
|
||||
help = ('Restart this network name. If not specified, list all networks and quit'))
|
||||
return(args)
|
||||
|
||||
|
||||
def main():
|
||||
args = parseArgs().parse_args()
|
||||
VMM = VMManager(**vars(args))
|
||||
if not args.netname:
|
||||
VMM.print_nets()
|
||||
VMM.restart()
|
||||
return(None)
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
main()
|
||||
Loading…
x
Reference in New Issue
Block a user