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: Hanna Reitz <hreitz@redhat.com>
  23
  24 import iotests
  25 from iotests import log, qemu_img, qemu_io, 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         qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M')
  51         qemu_img('create', '-f', iotests.imgfmt, '-b', base_img_path,
  52                  '-F', iotests.imgfmt, mid_img_path)
  53         qemu_img('create', '-f', iotests.imgfmt, '-b', mid_img_path,
  54                  '-F', iotests.imgfmt, top_img_path)
  55
  56         # Something to commit
  57         qemu_io(mid_img_path, '-c', 'write -P 1 0 1M')
  58
  59         vm.launch()
  60
  61         # Change the bottom-most image's backing file (to null-co://)
  62         # to enforce json:{} filenames
  63         vm.qmp_log('blockdev-add',
  64                     node_name='top',
  65                     driver=iotests.imgfmt,
  66                     file={
  67                         'driver': 'file',
  68                         'filename': top_img_path
  69                     },
  70                     backing={
  71                         'node-name': 'mid',
  72                         'driver': iotests.imgfmt,
  73                         'file': {
  74                             'driver': 'file',
  75                             'filename': mid_img_path
  76                         },
  77                         'backing': {
  78                             'node-name': 'base',
  79                             'driver': iotests.imgfmt,
  80                             'file': {
  81                                 'driver': 'file',
  82                                 'filename': base_img_path
  83                             },
  84                             'backing': {
  85                                 'driver': 'null-co'
  86                             }
  87                         }
  88                     },
  89                     filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
  90
  91         # As long as block-commit does not accept node names, we have to
  92         # get our mid/base filenames here
  93         mid_name = vm.node_info('mid')['image']['filename']
  94         base_name = vm.node_info('base')['image']['filename']
  95
  96         assert mid_name[:5] == 'json:'
  97         assert base_name[:5] == 'json:'
  98
  99         # Start the block job
 100         if filter_node_name:
 101             vm.qmp_log('block-commit',
 102                         job_id='commit',
 103                         device='top',
 104                         filter_node_name='filter_node',
 105                         top=mid_name,
 106                         base=base_name,
 107                         speed=1,
 108                         filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
 109         else:
 110             vm.qmp_log('block-commit',
 111                         job_id='commit',
 112                         device='top',
 113                         top=mid_name,
 114                         base=base_name,
 115                         speed=1,
 116                         filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
 117
 118         vm.qmp_log('job-pause', id='commit')
 119
 120         # Get and parse top's json:{} filename
 121         top_name = vm.node_info('top')['image']['filename']
 122
 123         vm.shutdown()
 124
 125         assert top_name[:5] == 'json:'
 126         top_options = json.loads(top_name[5:])
 127
 128         if filter_node_name:
 129             # This should be present and set
 130             assert top_options['backing']['driver'] == 'commit_top'
 131             # And the mid image is commit_top's backing image
 132             mid_options = top_options['backing']['backing']
 133         else:
 134             # The mid image should appear as the immediate backing BDS
 135             # of top
 136             mid_options = top_options['backing']
 137
 138         assert mid_options['driver'] == iotests.imgfmt
 139         assert mid_options['file']['filename'] == mid_img_path