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https://github.com/retspen/webvirtcloud
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The Disks tab has a Move button for each disk: it opens a dialog to choose another storage pool of the same host, and the move runs as a job. - Running or paused VM: libvirt copies the disk with a block job (TRANSIENT_JOB, as the VM is persistent) into a file it creates in the pool, then pivots. The pivot names the copy in both the running and the next start's definition. - Shut-off VM: the volume is copied into the pool and the copy named in the definition. The source file goes then, unless a VM or volume of any compute uses it (shared storage holds it for every host that mounts it), a compute cannot be read, or the delete fails: the job lists such a file under "Left behind", and the move stands. A disk moves when: - the VM is defined and running, paused or shut off, without snapshots, a saved state or a block job; - the disk is a writable, unshared, unencrypted raw or qcow2 file of a storage pool, without a backing file, and the same file in both definitions; - the pool keeps disk files, is another directory, and has no file of that name (libvirt would write into it). Otherwise it is refused with the reason before anything changes. The job claims the VM and the file's name in both pools. A cancel aborts the block copy, and ends the job cancelled once the VM is back on its file. A failed move deletes the copy it made, unless a definition names it (a lost reply after the pivot); a file there before the copy began is never deleted. Recovery after a stopped worker ends a copy left mirroring, matched by its destination, and reads the outcome from the definitions. Superusers only, like the other disk edits.
130 lines
7.1 KiB
Python
130 lines
7.1 KiB
Python
"""Moving a disk to another pool of its host runs as a job: the page queues
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it, the worker moves it, recovery ends a copy no worker waits for and reads
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the outcome from the VM's definitions."""
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from types import SimpleNamespace
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from unittest.mock import MagicMock, patch
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from django.contrib.auth import get_user_model
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from django.test import TransactionTestCase
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from django.urls import reverse
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from libvirt import libvirtError
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from appsettings.settings import get_settings
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from computes.models import Compute
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from instances.jobs import MoveDisk
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from instances.models import Instance
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from operations.jobs import Cancelled, Context, get_kind
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from operations.models import Claim, Operation, acquire
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UUID = "41414141-4242-5353-6464-757575757575"
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OLD, NEW = "/var/lib/libvirt/images/vm.qcow2", "/srv/fast/vm.qcow2"
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class MoveDiskJobTestCase(TransactionTestCase):
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def setUp(self):
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get_settings()
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self.compute = Compute.objects.create(name="mv-host", hostname="192.0.2.60", login="root", password="", type=1)
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self.vm = Instance.objects.create(compute=self.compute, name="mv-vm", uuid=UUID)
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self.admin = get_user_model().objects.create_superuser("mv_admin", "a@example.com", "pw")
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self.client.force_login(self.admin)
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patch.object(Compute, "status", True).start()
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self.proxy = patch("instances.jobs.wvmInstance").start().return_value
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self.proxy.disk_move_plan.return_value = {
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"dev": "vda", "path": OLD, "dest": NEW, "running": True,
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"volume": MagicMock(**{"storagePoolLookupByVolume.return_value.name.return_value": "default"})}
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patch("instances.views.get_instance", return_value=self.vm).start()
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self.addCleanup(patch.stopall)
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def queue(self, **form):
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self.client.post(reverse("instances:move_disk", args=[self.vm.pk]),
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{"dev": "vda", "pool": "fast", "submission_key": "key-move0001", **form})
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return Operation.objects.filter(kind="disk.move").first()
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def start(self, op):
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acquire("wvc-test:1:a", "wvc-test")
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Operation.objects.filter(pk=op.pk).update(state=Operation.RUNNING, worker="wvc-test:1:a")
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op.refresh_from_db()
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return Context(op, SimpleNamespace(identity="wvc-test:1:a"))
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def test_the_page_queues_it_and_the_worker_moves_it(self):
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op = self.queue()
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self.assertTrue({(f"instance:{UUID}", "exclusive"), (f"volume:{self.compute.pk}:default/vm.qcow2", "exclusive"),
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(f"volume:{self.compute.pk}:fast/vm.qcow2", "exclusive")}
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<= set(Claim.objects.values_list("resource", "mode")))
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self.proxy.move_disk.assert_not_called() # nothing ran in the request
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ctx = self.start(op)
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get_kind(op.kind).precheck(op, ctx)
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with patch("instances.jobs.wvmConnect") as hosts:
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hosts.return_value.paths_in_use.return_value = set()
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result = get_kind(op.kind).run(op, ctx)
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self.proxy.move_disk.assert_called_once()
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self.proxy.disk_move_plan.return_value["volume"].delete.assert_called_once_with(0) # the source went
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op.refresh_from_db()
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self.assertEqual((op.intent["path"], op.intent["dest"], result), (OLD, NEW, {"left_behind": []}))
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def test_a_source_file_any_host_may_use_is_left_behind(self):
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"""Shared storage: a VM or volume of another host may use it."""
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Compute.objects.create(name="mv-other", hostname="192.0.2.61", login="root", password="", type=1)
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cases = ((set(), {OLD}, None), (set(), set(), libvirtError("unreachable")),
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(set(), set(), "delete fails"))
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for n, (here, other, problem) in enumerate(cases):
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with self.subTest(case=n):
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Operation.objects.all().delete()
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op = self.queue(submission_key=f"key-left{n:04d}")
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ctx = self.start(op)
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volume = self.proxy.disk_move_plan.return_value["volume"]
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volume.delete.reset_mock()
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volume.delete.side_effect = libvirtError("busy") if problem == "delete fails" else None
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with patch("instances.jobs.wvmConnect") as hosts:
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reads = [here, other] if not isinstance(problem, libvirtError) else [here, problem]
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hosts.return_value.paths_in_use.side_effect = reads
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result = get_kind(op.kind).run(op, ctx)
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self.assertEqual(result, {"left_behind": [OLD]})
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self.assertEqual(volume.delete.called, problem == "delete fails")
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def test_only_a_superuser_with_a_disk_name_queues_it(self):
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self.assertIsNone(self.queue(dev="vda']"))
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self.client.force_login(get_user_model().objects.create_user("mv_user", password="pw"))
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self.assertIsNone(self.queue())
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def test_a_cancel_ends_cancelled_only_when_the_vm_kept_its_file(self):
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op = self.queue()
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ctx = self.start(op)
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self.proxy.move_disk.side_effect = libvirtError("The copy of vda ended before it was complete")
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self.proxy.instance.blockJobInfo.return_value = {}
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self.proxy.disk_named.return_value = {OLD}
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Operation.objects.filter(pk=op.pk).update(cancel_requested=True)
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with self.assertRaises(Cancelled):
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get_kind(op.kind).run(op, ctx)
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# the pivot may have happened: the error stands, not a cancel
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self.proxy.disk_named.return_value = {NEW}
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with self.assertRaisesRegex(libvirtError, "ended before it was complete"):
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get_kind(op.kind).run(op, ctx)
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def reconcile(self, named, job=None, mirror=NEW):
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op = Operation(params={"instance": self.vm.pk, "dev": "vda", "pool": "fast"},
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intent={"compute": self.compute.pk, "uuid": UUID, "path": OLD, "dest": NEW})
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dom = self.proxy.instance
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dom.isActive.return_value = True
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dom.blockJobInfo.return_value = job or {}
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dom.XMLDesc.return_value = (f"<domain><devices><disk><target dev='vda'/><mirror><source file='{mirror}'/>"
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"</mirror></disk></devices></domain>")
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self.proxy.disk_named.return_value = named
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return MoveDisk().reconcile(op)
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def test_recovery_reads_the_definitions(self):
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self.assertEqual(self.reconcile({NEW}).state, Operation.SUCCEEDED)
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failed = self.reconcile({OLD})
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self.assertEqual((failed.state, failed.error), (Operation.FAILED, f"The disk stayed in {OLD}; remove {NEW} "
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"if it is there"))
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self.assertEqual(self.reconcile({OLD, NEW}).state, Operation.UNCERTAIN)
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self.proxy.instance.blockJobAbort.assert_not_called()
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def test_recovery_ends_the_copy_no_worker_waits_for(self):
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self.assertEqual(self.reconcile({OLD}, job={"cur": 2, "end": 2}).state, Operation.FAILED)
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self.proxy.instance.blockJobAbort.assert_called_once_with("vda", 0)
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# a block job of something else is not ended
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self.proxy.instance.blockJobAbort.reset_mock()
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self.assertEqual(self.reconcile({OLD}, job={"cur": 1, "end": 2}, mirror="/other").state, Operation.UNCERTAIN)
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self.proxy.instance.blockJobAbort.assert_not_called()
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