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#!/usr/bin/python
"""
Virt management features
Copyright 2007, Red Hat, Inc
Michael DeHaan <mdehaan@redhat.com>
This software may be freely redistributed under the terms of the GNU
general public license.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
"""
# warning: virt management is rather complicated
# to see a simple example of func, look at the
# service control module. API docs on how
# to use this to come.
# other modules
import os
import sub_process
import libvirt
# our modules
import codes
import func_module
VIRT_STATE_NAME_MAP = {
0 : "running",
1 : "running",
2 : "running",
3 : "paused",
4 : "shutdown",
5 : "shutdown",
6 : "crashed"
}
class FuncLibvirtConnection(object):
def __init__(self):
cmd = sub_process.Popen("uname -r", shell=True, stdout=sub_process.PIPE)
output = cmd.communicate()[0]
if output.find("xen") != -1:
conn = libvirt.open(None)
else:
conn = libvirt.open("qemu:///system")
if not conn:
raise codes.FuncException("hypervisor connection failure")
self.conn = conn
def find_vm(self, vmid):
"""
Extra bonus feature: vmid = -1 returns a list of everything
"""
conn = self.conn
vms = []
# this block of code borrowed from virt-manager:
# get working domain's name
ids = conn.listDomainsID();
for id in ids:
vm = conn.lookupByID(id)
vms.append(vm)
# get defined domain
names = conn.listDefinedDomains()
for name in names:
vm = conn.lookupByName(name)
vms.append(vm)
if vmid == -1:
return vms
for vm in vms:
if vm.name() == vmid:
return vm
raise codes.FuncException("virtual machine %s not found" % needle)
def shutdown(self, vmid):
return self.find_vm(vmid).shutdown()
def pause(self, vmid):
return suspend(self.conn,vmid)
def unpause(self, vmid):
return resume(self.conn,vmid)
def suspend(self, vmid):
return self.find_vm(vmid).suspend()
def resume(self, vmid):
return self.find_vm(vmid).resume()
def create(self, vmid):
return self.find_vm(vmid).create()
def destroy(self, vmid):
return self.find_vm(vmid).destroy()
def undefine(self, vmid):
return self.find_vm(vmid).undefine()
def get_status2(self, vm):
state = vm.info()[0]
# print "DEBUG: state: %s" % state
return VIRT_STATE_NAME_MAP.get(state,"unknown")
def get_status(self, vmid):
state = self.find_vm(vmid).info()[0]
return VIRT_STATE_NAME_MAP.get(state,"unknown")
class Virt(func_module.FuncModule):
def __init__(self):
"""
Constructor. Register methods and make them available.
"""
self.methods = {
"install" : self.install,
"shutdown" : self.shutdown,
"destroy" : self.destroy,
"start" : self.create,
"pause" : self.pause,
"unpause" : self.unpause,
"delete" : self.undefine,
"status" : self.get_status,
"list_vms" : self.list_vms,
}
func_module.FuncModule.__init__(self)
def get_conn(self):
self.conn = FuncLibvirtConnection()
return self.conn
def list_vms(self):
self.conn = self.get_conn()
vms = self.conn.find_vm(-1)
results = []
for x in vms:
try:
results.append(x.name())
except:
pass
return results
def install(self, server_name, target_name, system=False):
"""
Install a new virt system by way of a named cobbler profile.
"""
# Example:
# install("bootserver.example.org", "fc7webserver", True)
conn = self.get_conn()
if conn is None:
raise codes.FuncException("no connection")
if not os.path.exists("/usr/bin/koan"):
raise codes.FuncException("no /usr/bin/koan")
target = "profile"
if system:
target = "system"
# TODO: FUTURE: set --virt-path in cobbler or here
koan_args = [
"/usr/bin/koan",
"--virt",
"--virt-graphics", # enable VNC
"--%s=%s" % (target, target_name),
"--server=%s" % server_name
]
rc = sub_process.call(koan_args,shell=False)
if rc == 0:
return 0
else:
raise codes.FuncException("koan returned %d" % rc)
def shutdown(self, vmid):
"""
Make the machine with the given vmid stop running.
Whatever that takes.
"""
self.get_conn()
self.conn.shutdown(vmid)
return 0
def pause(self, vmid):
"""
Pause the machine with the given vmid.
"""
self.get_conn()
self.conn.suspend(vmid)
return 0
def unpause(self, vmid):
"""
Unpause the machine with the given vmid.
"""
self.get_conn()
self.conn.resume(vmid)
return 0
def create(self, vmid):
"""
Start the machine via the given mac address.
"""
self.get_conn()
self.conn.create(vmid)
return 0
def destroy(self, vmid):
"""
Pull the virtual power from the virtual domain, giving it virtually no
time to virtually shut down.
"""
self.get_conn()
self.conn.destroy(vmid)
return 0
def undefine(self, vmid):
"""
Stop a domain, and then wipe it from the face of the earth.
by deleting the disk image and it's configuration file.
"""
self.get_conn()
self.conn.undefine(vmid)
return 0
def get_status(self, vmid):
"""
Return a state suitable for server consumption. Aka, codes.py values, not XM output.
"""
self.get_conn()
return self.conn.get_status(vmid)
methods = Virt()
register_rpc = methods.register_rpc
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