2 Functions to perform remctls.
5 from sipb_xen_database import Machine, Disk, Type, NIC, CDROM, ctx, meta
7 from webcommon import CodeError, InvalidInput
15 # ... and stolen from xend/uuid.py
17 """Generate a random UUID."""
19 return [ random.randint(0, 255) for _ in range(0, 16) ]
22 """Turn a numeric UUID to a hyphen-seperated one."""
23 return "-".join(["%02x" * 4, "%02x" * 2, "%02x" * 2, "%02x" * 2,
24 "%02x" * 6]) % tuple(u)
27 def kinit(username = 'daemon/sipb-xen.mit.edu', keytab = '/etc/sipb-xen.keytab'):
28 """Kinit with a given username and keytab"""
30 p = subprocess.Popen(['kinit', "-k", "-t", keytab, username],
31 stderr=subprocess.PIPE)
34 raise CodeError("Error %s in kinit: %s" % (e, p.stderr.read()))
37 """If we lack tickets, kinit."""
38 p = subprocess.Popen(['klist', '-s'])
42 def remctl(*args, **kws):
43 """Perform a remctl and return the output.
45 kinits if necessary, and outputs errors to stderr.
48 p = subprocess.Popen(['remctl', 'remote.mit.edu']
50 stdout=subprocess.PIPE,
51 stderr=subprocess.PIPE)
54 return p.stdout.read(), p.stderr.read()
56 print >> sys.stderr, 'Error', v, 'on remctl', args, ':'
57 print >> sys.stderr, p.stderr.read()
58 raise CodeError('ERROR on remctl')
59 return p.stdout.read()
61 def lvcreate(machine, disk):
62 """Create a single disk for a machine"""
63 remctl('web', 'lvcreate', machine.name,
64 disk.guest_device_name, str(disk.size))
66 def makeDisks(machine):
67 """Update the lvm partitions to add a disk."""
68 for disk in machine.disks:
69 lvcreate(machine, disk)
71 def lvcopy(machine_orig_name, machine, rootpw):
72 """Copy a golden image onto a machine's disk"""
73 remctl('web', 'lvcopy', machine_orig_name, machine.name, rootpw)
75 def bootMachine(machine, cdtype):
76 """Boot a machine with a given boot CD.
78 If cdtype is None, give no boot cd. Otherwise, it is the string
79 id of the CD (e.g. 'gutsy_i386')
81 if cdtype is not None:
82 out, err = remctl('control', machine.name, 'create',
85 out, err = remctl('control', machine.name, 'create',
87 if 'already exists' in out:
88 raise InvalidInput('action', 'create',
89 'VM %s is already on' % machine.name)
91 raise CodeError('"%s" on "control %s create %s'
92 % (err, machine.name, cdtype))
94 def createVm(owner, contact, name, memory, disk_size, machine_type, cdrom, clone_from):
95 """Create a VM and put it in the database"""
96 # put stuff in the table
97 transaction = ctx.current.create_transaction()
99 validation.validMemory(owner, memory)
100 validation.validDisk(owner, disk_size * 1. / 1024)
101 validation.validAddVm(owner)
102 res = meta.engine.execute('select nextval('
103 '\'"machines_machine_id_seq"\')')
104 id = res.fetchone()[0]
106 machine.machine_id = id
108 machine.memory = memory
109 machine.owner = owner
110 machine.administrator = owner
111 machine.contact = contact
112 machine.uuid = uuidToString(randomUUID())
113 machine.boot_off_cd = True
114 machine.type_id = machine_type.type_id
115 ctx.current.save(machine)
116 disk = Disk(machine_id=machine.machine_id,
117 guest_device_name='hda', size=disk_size)
118 open_nics = NIC.select_by(machine_id=None)
119 if not open_nics: #No IPs left!
120 raise CodeError("No IP addresses left! "
121 "Contact sipb-xen@mit.edu.")
123 nic.machine_id = machine.machine_id
125 ctx.current.save(nic)
126 ctx.current.save(disk)
127 cache_acls.refreshMachine(machine)
130 transaction.rollback()
134 lvcopy(clone_from, machine, 'password')
135 # tell it to boot with cdrom
136 bootMachine(machine, cdrom)
139 def getUptimes(machines=None):
140 """Return a dictionary mapping machine names to uptime strings"""
141 value_string = remctl('web', 'listvms')
142 lines = value_string.splitlines()
147 uptime = ' '.join(lst[2:])
151 ans[m] = d.get(m.name)
155 """Parse a status string into nested tuples of strings.
157 s = output of xm list --long <machine_name>
159 values = re.split('([()])', s)
161 for v in values[2:-2]: #remove initial and final '()'
168 if len(stack[-1]) == 1:
170 stack[-2].append(stack[-1])
175 stack[-1].extend(v.split())
178 def statusInfo(machine):
179 """Return the status list for a given machine.
181 Gets and parses xm list --long
183 value_string, err_string = remctl('control', machine.name, 'list-long',
185 if 'Unknown command' in err_string:
186 raise CodeError("ERROR in remctl list-long %s is not registered" %
188 elif 'does not exist' in err_string:
191 raise CodeError("ERROR in remctl list-long %s: %s" %
192 (machine.name, err_string))
193 status = parseStatus(value_string)
196 def deleteVM(machine):
198 remctl('control', machine.name, 'destroy', err=True)
199 transaction = ctx.current.create_transaction()
200 delete_disk_pairs = [(machine.name, d.guest_device_name)
201 for d in machine.disks]
203 for nic in machine.nics:
204 nic.machine_id = None
206 ctx.current.save(nic)
207 for disk in machine.disks:
208 ctx.current.delete(disk)
209 for access in machine.acl:
210 ctx.current.delete(access)
211 ctx.current.delete(machine)
214 transaction.rollback()
216 for mname, dname in delete_disk_pairs:
217 remctl('web', 'lvremove', mname, dname)
219 def commandResult(user, fields):
221 machine = validation.testMachineId(user, fields.getfirst('machine_id'))
222 action = fields.getfirst('action')
223 cdrom = fields.getfirst('cdrom')
224 if cdrom is not None and not CDROM.get(cdrom):
225 raise CodeError("Invalid cdrom type '%s'" % cdrom)
226 if action not in ('Reboot', 'Power on', 'Power off', 'Shutdown',
228 raise CodeError("Invalid action '%s'" % action)
229 if action == 'Reboot':
230 if cdrom is not None:
231 out, err = remctl('control', machine.name, 'reboot', cdrom,
234 out, err = remctl('control', machine.name, 'reboot',
237 if re.match("Error: Domain '.*' does not exist.", err):
238 raise InvalidInput("action", "reboot",
241 print >> sys.stderr, 'Error on reboot:'
242 print >> sys.stderr, err
243 raise CodeError('ERROR on remctl')
245 elif action == 'Power on':
246 if validation.maxMemory(user, machine) < machine.memory:
247 raise InvalidInput('action', 'Power on',
248 "You don't have enough free RAM quota "
249 "to turn on this machine.")
250 bootMachine(machine, cdrom)
251 elif action == 'Power off':
252 out, err = remctl('control', machine.name, 'destroy', err=True)
254 if re.match("Error: Domain '.*' does not exist.", err):
255 raise InvalidInput("action", "Power off",
256 "Machine is not on.")
258 print >> sys.stderr, 'Error on power off:'
259 print >> sys.stderr, err
260 raise CodeError('ERROR on remctl')
261 elif action == 'Shutdown':
262 out, err = remctl('control', machine.name, 'shutdown', err=True)
264 if re.match("Error: Domain '.*' does not exist.", err):
265 raise InvalidInput("action", "Shutdown",
266 "Machine is not on.")
268 print >> sys.stderr, 'Error on Shutdown:'
269 print >> sys.stderr, err
270 raise CodeError('ERROR on remctl')
271 elif action == 'Delete VM':
279 def resizeDisk(machine_name, disk_name, new_size):
280 remctl("web", "lvresize", machine_name, disk_name, new_size)
282 def renameMachine(machine, old_name, new_name):
283 for disk in machine.disks:
284 remctl("web", "lvrename", old_name,
285 disk.guest_device_name, new_name)