mirror of
https://github.com/retspen/webvirtcloud
synced 2026-11-10 20:26:48 +00:00
3fd422db7e
When libvirt cannot remove a snapshot file it merged or discarded, it only logs a warning and the delete or revert still succeeds. On NFS it removes them as the qemu user, so an image directory the qemu user may not write to left every merged overlay on disk without a word. Revert and delete now compare the files in use before and after and show a warning naming the ones still on disk. Only a snapshot's own files (overlays, memory) and overlays on a snapshot point count, and a disk the revert detached is never named, so a kept disk is not offered for removal.
151 lines
6.7 KiB
Python
151 lines
6.7 KiB
Python
"""Live checks for external snapshots on libvirt's own API. Runs only with
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TEST_LIBVIRT_HOST set (see instances/tests/livetest.py)."""
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import os
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import unittest
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import libvirt
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from django.test import SimpleTestCase
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from lxml import etree
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from vrtManager import util
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from vrtManager.connection import connection_manager
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from vrtManager.instance import wvmInstance
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from . import livetest
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P = livetest.PREFIX
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class LiveExternalSnapshotTestCase(SimpleTestCase):
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@classmethod
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def setUpClass(cls):
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if not livetest.enabled():
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raise unittest.SkipTest("Set TEST_LIBVIRT_HOST to run the live libvirt tests")
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cls.args = (
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os.environ["TEST_LIBVIRT_HOST"],
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os.environ.get("TEST_LIBVIRT_LOGIN", ""),
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os.environ.get("TEST_LIBVIRT_PASSWORD", ""),
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int(os.environ.get("TEST_LIBVIRT_TYPE", 4)),
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)
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cls.conn = connection_manager.get_connection(*cls.args)
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livetest.cleanup(cls.conn)
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livetest.ensure_pool(cls.conn)
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cls.inventory = livetest.inventory(cls.conn)
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super().setUpClass()
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@classmethod
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def tearDownClass(cls):
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try:
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livetest.remove_pool(cls.conn)
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finally:
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super().tearDownClass()
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if livetest.inventory(cls.conn) != cls.inventory:
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raise AssertionError("Live tests changed objects outside the test namespace")
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def tearDown(self):
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livetest.cleanup(self.conn)
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def vm(self, name, state="stopped", uefi=False, extra_devices=""):
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base = livetest.create_volume(self.conn, P + name)
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dom = livetest.define_vm(self.conn, P + name, [base], uefi=uefi, extra_devices=extra_devices)
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if state in ("running", "paused"):
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dom.create()
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if state == "paused":
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dom.suspend()
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return dom, wvmInstance(*self.args, None, uuid=dom.UUIDString())
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def pool_files(self, name):
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"""The test pool's files whose names start with the VM's name."""
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pool = self.conn.storagePoolLookupByName(livetest.POOL)
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pool.refresh(0)
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return {vol for vol in pool.listVolumes() if vol.startswith(P + name + ".")}
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def top(self, dom):
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return etree.fromstring(dom.XMLDesc(0)).xpath("string(devices/disk[@device='disk']/source/@file)")
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def test_create_revert_delete_keep_the_state(self):
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for state, expected in (("stopped", libvirt.VIR_DOMAIN_SHUTOFF),
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("running", libvirt.VIR_DOMAIN_RUNNING),
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("paused", libvirt.VIR_DOMAIN_PAUSED)):
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with self.subTest(state):
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dom, vm = self.vm("snap-" + state, state)
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base = self.top(dom)
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vm.create_external_snapshot("one", "first")
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vm.create_external_snapshot("two")
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self.assertEqual(vm.revert_external_snapshot("one"), [], "files left behind")
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self.assertEqual(dom.state()[0], expected)
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self.assertEqual(vm.delete_external_snapshot("two"), [], "files left behind")
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self.assertEqual(vm.delete_external_snapshot("one"), [], "files left behind")
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self.assertEqual(self.pool_files("snap-" + state), {os.path.basename(base)}, "an overlay stayed on disk")
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self.assertEqual(dom.snapshotNum(0), 0)
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self.assertEqual(dom.state()[0], expected)
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self.assertTrue(livetest.volume_exists(self.conn, base))
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def test_memory_snapshot_resumes_and_its_file_goes_with_it(self):
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dom, vm = self.vm("snap-mem", "running")
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vm.create_external_snapshot("m", memory=True)
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mem = os.path.join(livetest.POOL_PATH, f"{dom.UUIDString()}.m.mem")
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self.assertTrue(livetest.volume_exists(self.conn, mem))
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dom.suspend()
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vm.revert_external_snapshot("m")
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self.assertEqual(dom.state()[0], libvirt.VIR_DOMAIN_RUNNING)
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self.assertEqual(vm.delete_external_snapshot("m"), [])
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self.assertFalse(livetest.volume_exists(self.conn, mem))
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def test_uefi_vm_keeps_its_loader(self):
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dom, vm = self.vm("snap-uefi", "running", uefi=True)
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os_before = etree.tostring(etree.fromstring(dom.XMLDesc(libvirt.VIR_DOMAIN_XML_INACTIVE)).find("os"))
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vm.create_external_snapshot("u")
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vm.revert_external_snapshot("u")
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vm.delete_external_snapshot("u")
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self.assertEqual(etree.tostring(etree.fromstring(dom.XMLDesc(libvirt.VIR_DOMAIN_XML_INACTIVE)).find("os")), os_before)
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self.assertEqual(dom.snapshotNum(0), 0)
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def test_back_to_back_reverts_keep_a_running_vm_running(self):
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# Without the retry, the second revert within one second stopped the VM.
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dom, vm = self.vm("snap-collide", "running")
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vm.create_external_snapshot("a")
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for _ in range(3):
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vm.revert_external_snapshot("a")
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vm.revert_external_snapshot("a")
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self.assertEqual(dom.state()[0], libvirt.VIR_DOMAIN_RUNNING)
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def test_a_mixed_vm_can_be_cleaned_up(self):
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dom, vm = self.vm("snap-mixed-clean")
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dom.snapshotCreateXML("<domainsnapshot><name>i</name></domainsnapshot>", 0)
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dom.snapshotCreateXML(
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"<domainsnapshot><name>e</name></domainsnapshot>", libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY
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)
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# libvirt refuses an external snapshot whose parent is internal, so the
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# internal one goes first
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vm.snapshot_delete("i")
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vm.delete_external_snapshot("e")
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self.assertEqual(dom.snapshotNum(0), 0)
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def test_chain_stays_linear(self):
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dom, vm = self.vm("snap-linear")
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vm.create_external_snapshot("a")
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vm.create_external_snapshot("b")
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vm.revert_external_snapshot("a")
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with self.assertRaisesRegex(util.OperationError, "Newer snapshots"):
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vm.create_external_snapshot("c")
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vm.delete_external_snapshot("b")
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vm.create_external_snapshot("c")
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def test_refusals(self):
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iso = livetest.create_volume(self.conn, P + "snap-media")
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cdrom = (f"<disk type='file' device='cdrom'><driver name='qemu' type='qcow2'/><source file='{iso}'/>"
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"<target dev='sda' bus='sata'/><readonly/></disk>")
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_, vm = self.vm("snap-cdrom", extra_devices=cdrom)
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with self.assertRaisesRegex(util.OperationError, "Eject"):
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vm.create_external_snapshot("x")
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dom, vm = self.vm("snap-saved", "running")
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dom.managedSave(0)
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with self.assertRaisesRegex(util.OperationError, "saved state"):
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vm.create_external_snapshot("x")
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dom, vm = self.vm("snap-mixed")
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dom.snapshotCreateXML("<domainsnapshot><name>i</name></domainsnapshot>", 0)
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with self.assertRaisesRegex(util.OperationError, "internal snapshots"):
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vm.create_external_snapshot("x")
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