tests/qemu-iotests/224

   1 #!/usr/bin/env python3
   2 # group: rw quick
   3 #
   4 # Test json:{} filenames with qemu-internal BDSs
   5 # (the one of commit, to be precise)
   6 #
   7 # Copyright (C) 2018 Red Hat, Inc.
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22 # Creator/Owner: Max Reitz <mreitz@redhat.com>
  23
  24 import iotests
  25 from iotests import log, qemu_img, qemu_io_silent, filter_qmp_testfiles, \
  26                     filter_qmp_imgfmt
  27 import json
  28
  29 # Need backing file support (for arbitrary backing formats)
  30 iotests.script_initialize(supported_fmts=['qcow2', 'qcow', 'qed'],
  31                           supported_platforms=['linux'])
  32
  33
  34 # There are two variations of this test:
  35 # (1) We do not set filter_node_name.  In that case, the commit_top
  36 #     driver should not appear anywhere.
  37 # (2) We do set filter_node_name.  In that case, it should appear.
  38 #
  39 # This for loop executes both.
  40 for filter_node_name in False, True:
  41     log('')
  42     log('--- filter_node_name: %s ---' % filter_node_name)
  43     log('')
  44
  45     with iotests.FilePath('base.img') as base_img_path, \
  46          iotests.FilePath('mid.img') as mid_img_path, \
  47          iotests.FilePath('top.img') as top_img_path, \
  48          iotests.VM() as vm:
  49
  50         assert qemu_img('create', '-f', iotests.imgfmt,
  51                         base_img_path, '64M') == 0
  52         assert qemu_img('create', '-f', iotests.imgfmt, '-b', base_img_path,
  53                         '-F', iotests.imgfmt, mid_img_path) == 0
  54         assert qemu_img('create', '-f', iotests.imgfmt, '-b', mid_img_path,
  55                         '-F', iotests.imgfmt, top_img_path) == 0
  56
  57         # Something to commit
  58         assert qemu_io_silent(mid_img_path, '-c', 'write -P 1 0 1M') == 0
  59
  60         vm.launch()
  61
  62         # Change the bottom-most image's backing file (to null-co://)
  63         # to enforce json:{} filenames
  64         vm.qmp_log('blockdev-add',
  65                     node_name='top',
  66                     driver=iotests.imgfmt,
  67                     file={
  68                         'driver': 'file',
  69                         'filename': top_img_path
  70                     },
  71                     backing={
  72                         'node-name': 'mid',
  73                         'driver': iotests.imgfmt,
  74                         'file': {
  75                             'driver': 'file',
  76                             'filename': mid_img_path
  77                         },
  78                         'backing': {
  79                             'node-name': 'base',
  80                             'driver': iotests.imgfmt,
  81                             'file': {
  82                                 'driver': 'file',
  83                                 'filename': base_img_path
  84                             },
  85                             'backing': {
  86                                 'driver': 'null-co'
  87                             }
  88                         }
  89                     },
  90                     filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
  91
  92         # As long as block-commit does not accept node names, we have to
  93         # get our mid/base filenames here
  94         mid_name = vm.node_info('mid')['image']['filename']
  95         base_name = vm.node_info('base')['image']['filename']
  96
  97         assert mid_name[:5] == 'json:'
  98         assert base_name[:5] == 'json:'
  99
 100         # Start the block job
 101         if filter_node_name:
 102             vm.qmp_log('block-commit',
 103                         job_id='commit',
 104                         device='top',
 105                         filter_node_name='filter_node',
 106                         top=mid_name,
 107                         base=base_name,
 108                         speed=1,
 109                         filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
 110         else:
 111             vm.qmp_log('block-commit',
 112                         job_id='commit',
 113                         device='top',
 114                         top=mid_name,
 115                         base=base_name,
 116                         speed=1,
 117                         filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
 118
 119         vm.qmp_log('job-pause', id='commit')
 120
 121         # Get and parse top's json:{} filename
 122         top_name = vm.node_info('top')['image']['filename']
 123
 124         vm.shutdown()
 125
 126         assert top_name[:5] == 'json:'
 127         top_options = json.loads(top_name[5:])
 128
 129         if filter_node_name:
 130             # This should be present and set
 131             assert top_options['backing']['driver'] == 'commit_top'
 132             # And the mid image is commit_top's backing image
 133             mid_options = top_options['backing']['backing']
 134         else:
 135             # The mid image should appear as the immediate backing BDS
 136             # of top
 137             mid_options = top_options['backing']
 138
 139         assert mid_options['driver'] == iotests.imgfmt
 140         assert mid_options['file']['filename'] == mid_img_path