qemu

FORK: QEMU emulator
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migrate-during-backup (3512B)

      1 #!/usr/bin/env python3
      2 # group: migration
      3 #
      4 # Copyright (c) 2021 Virtuozzo International GmbH
      5 #
      6 # This program is free software; you can redistribute it and/or modify
      7 # it under the terms of the GNU General Public License as published by
      8 # the Free Software Foundation; either version 2 of the License, or
      9 # (at your option) any later version.
     10 #
     11 # This program is distributed in the hope that it will be useful,
     12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
     13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14 # GNU General Public License for more details.
     15 #
     16 # You should have received a copy of the GNU General Public License
     17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
     18 #
     19 
     20 import os
     21 import iotests
     22 from iotests import qemu_img_create, qemu_io
     23 
     24 
     25 disk_a = os.path.join(iotests.test_dir, 'disk_a')
     26 disk_b = os.path.join(iotests.test_dir, 'disk_b')
     27 size = '1M'
     28 mig_file = os.path.join(iotests.test_dir, 'mig_file')
     29 mig_cmd = 'exec: cat > ' + mig_file
     30 
     31 
     32 class TestMigrateDuringBackup(iotests.QMPTestCase):
     33     def tearDown(self):
     34         self.vm.shutdown()
     35         os.remove(disk_a)
     36         os.remove(disk_b)
     37         os.remove(mig_file)
     38 
     39     def setUp(self):
     40         qemu_img_create('-f', iotests.imgfmt, disk_a, size)
     41         qemu_img_create('-f', iotests.imgfmt, disk_b, size)
     42         qemu_io('-c', f'write 0 {size}', disk_a)
     43 
     44         self.vm = iotests.VM().add_drive(disk_a)
     45         self.vm.launch()
     46         result = self.vm.qmp('blockdev-add', {
     47             'node-name': 'target',
     48             'driver': iotests.imgfmt,
     49             'file': {
     50                 'driver': 'file',
     51                 'filename': disk_b
     52             }
     53         })
     54         self.assert_qmp(result, 'return', {})
     55 
     56     def test_migrate(self):
     57         result = self.vm.qmp('blockdev-backup', device='drive0',
     58                              target='target', sync='full',
     59                              speed=1, x_perf={
     60                                  'max-workers': 1,
     61                                  'max-chunk': 64 * 1024
     62                              })
     63         self.assert_qmp(result, 'return', {})
     64 
     65         result = self.vm.qmp('job-pause', id='drive0')
     66         self.assert_qmp(result, 'return', {})
     67 
     68         result = self.vm.qmp('migrate-set-capabilities',
     69                              capabilities=[{'capability': 'events',
     70                                             'state': True}])
     71         self.assert_qmp(result, 'return', {})
     72         result = self.vm.qmp('migrate', uri=mig_cmd)
     73         self.assert_qmp(result, 'return', {})
     74 
     75         e = self.vm.events_wait((('MIGRATION',
     76                                   {'data': {'status': 'completed'}}),
     77                                  ('MIGRATION',
     78                                   {'data': {'status': 'failed'}})))
     79 
     80         # Don't assert that e is 'failed' now: this way we'll miss
     81         # possible crash when backup continues :)
     82 
     83         result = self.vm.qmp('block-job-set-speed', device='drive0',
     84                              speed=0)
     85         self.assert_qmp(result, 'return', {})
     86         result = self.vm.qmp('job-resume', id='drive0')
     87         self.assert_qmp(result, 'return', {})
     88 
     89         # For future: if something changes so that both migration
     90         # and backup pass, let's not miss that moment, as it may
     91         # be a bug as well as improvement.
     92         self.assert_qmp(e, 'data/status', 'failed')
     93 
     94 
     95 if __name__ == '__main__':
     96     iotests.main(supported_fmts=['qcow2'],
     97                  supported_protocols=['file'])