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97e2f021f8
Instead of having every block driver which implements bdrv_refresh_filename() copy all of the strong runtime options over to bs->full_open_options, implement this process generically in bdrv_refresh_filename(). This patch only adds this new generic implementation, it does not remove the old functionality. This is done in a follow-up patch. With this patch, some superfluous information (that should never have been there) may be removed from some JSON filenames, as can be seen in the change to iotests 110's and 228's reference outputs. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20190201192935.18394-24-mreitz@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
243 lines
7.9 KiB
Python
Executable file
243 lines
7.9 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# Test for when a backing file is considered overridden (thus, a
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# json:{} filename is generated for the overlay) and when it is not
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#
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# Copyright (C) 2018 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Creator/Owner: Max Reitz <mreitz@redhat.com>
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import iotests
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from iotests import log, qemu_img, filter_testfiles, filter_imgfmt, \
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filter_qmp_testfiles, filter_qmp_imgfmt
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# Need backing file and change-backing-file support
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iotests.verify_image_format(supported_fmts=['qcow2', 'qed'])
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iotests.verify_platform(['linux'])
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def log_node_info(node):
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log('')
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log('bs->filename: ' + node['image']['filename'],
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filters=[filter_testfiles, filter_imgfmt])
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log('bs->backing_file: ' + node['backing_file'],
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filters=[filter_testfiles, filter_imgfmt])
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if 'backing-image' in node['image']:
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log('bs->backing->bs->filename: ' +
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node['image']['backing-image']['filename'],
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filters=[filter_testfiles, filter_imgfmt])
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else:
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log('bs->backing: (none)')
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log('')
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with iotests.FilePath('base.img') as base_img_path, \
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iotests.FilePath('top.img') as top_img_path, \
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iotests.VM() as vm:
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assert qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M') == 0
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# Choose a funny way to describe the backing filename
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assert qemu_img('create', '-f', iotests.imgfmt, '-b',
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'file:' + base_img_path, top_img_path) == 0
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vm.launch()
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log('--- Implicit backing file ---')
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log('')
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vm.qmp_log('blockdev-add',
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node_name='node0',
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driver=iotests.imgfmt,
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file={
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'driver': 'file',
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'filename': top_img_path
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},
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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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# Filename should be plain, and the backing filename should not
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# contain the "file:" prefix
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log_node_info(vm.node_info('node0'))
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vm.qmp_log('blockdev-del', node_name='node0')
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log('')
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log('--- change-backing-file ---')
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log('')
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vm.qmp_log('blockdev-add',
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node_name='node0',
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driver=iotests.imgfmt,
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file={
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'driver': 'file',
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'filename': top_img_path
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},
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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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# Changing the backing file to a qemu-reported filename should
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# result in qemu accepting the corresponding BDS as the implicit
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# backing BDS (and thus not generate a json:{} filename).
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# So, first, query the backing filename.
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backing_filename = \
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vm.node_info('node0')['image']['backing-image']['filename']
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# Next, change the backing file to something different
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vm.qmp_log('change-backing-file',
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image_node_name='node0',
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device='node0',
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backing_file='null-co://',
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filters=[filter_qmp_testfiles])
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# Now, verify that we get a json:{} filename
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# (Image header says "null-co://", actual backing file still is
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# base_img_path)
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log_node_info(vm.node_info('node0'))
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# Change it back
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# (To get header and backing file in sync)
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vm.qmp_log('change-backing-file',
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image_node_name='node0',
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device='node0',
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backing_file=backing_filename,
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filters=[filter_qmp_testfiles])
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# And verify that we get our original results
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log_node_info(vm.node_info('node0'))
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# Finally, try a "file:" prefix. While this is actually what we
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# originally had in the image header, qemu will not reopen the
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# backing file here, so it cannot verify that this filename
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# "resolves" to the actual backing BDS's filename and will thus
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# consider both to be different.
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# (This may be fixed in the future.)
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vm.qmp_log('change-backing-file',
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image_node_name='node0',
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device='node0',
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backing_file=('file:' + backing_filename),
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filters=[filter_qmp_testfiles])
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# So now we should get a json:{} filename
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log_node_info(vm.node_info('node0'))
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# Remove and re-attach so we can see that (as in our first try),
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# opening the image anew helps qemu resolve the header backing
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# filename.
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vm.qmp_log('blockdev-del', node_name='node0')
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vm.qmp_log('blockdev-add',
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node_name='node0',
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driver=iotests.imgfmt,
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file={
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'driver': 'file',
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'filename': top_img_path
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},
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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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log_node_info(vm.node_info('node0'))
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vm.qmp_log('blockdev-del', node_name='node0')
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log('')
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log('--- Override backing file ---')
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log('')
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# For this test, we need the plain filename in the image header
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# (because qemu cannot "canonicalize"/"resolve" the backing
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# filename unless the backing file is opened implicitly with the
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# overlay)
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assert qemu_img('create', '-f', iotests.imgfmt, '-b', base_img_path,
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top_img_path) == 0
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# You can only reliably override backing options by using a node
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# reference (or by specifying file.filename, but, well...)
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vm.qmp_log('blockdev-add', node_name='null', driver='null-co')
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vm.qmp_log('blockdev-add',
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node_name='node0',
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driver=iotests.imgfmt,
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file={
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'driver': 'file',
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'filename': top_img_path
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},
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backing='null',
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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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# Should get a json:{} filename (and bs->backing_file is
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# null-co://, because that field actually has not much to do
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# with the header backing filename (except that it is changed by
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# change-backing-file))
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log_node_info(vm.node_info('node0'))
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# Detach the backing file by reopening the whole thing
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vm.qmp_log('blockdev-del', node_name='node0')
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vm.qmp_log('blockdev-del', node_name='null')
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vm.qmp_log('blockdev-add',
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node_name='node0',
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driver=iotests.imgfmt,
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file={
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'driver': 'file',
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'filename': top_img_path
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},
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backing=None,
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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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# Should get a json:{} filename (because we overrode the backing
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# file to not be there)
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log_node_info(vm.node_info('node0'))
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# Open the original backing file
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vm.qmp_log('blockdev-add',
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node_name='original-backing',
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driver=iotests.imgfmt,
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file={
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'driver': 'file',
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'filename': base_img_path
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},
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filters=[filter_qmp_testfiles, filter_qmp_imgfmt])
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# Attach the original backing file to its overlay
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vm.qmp_log('blockdev-snapshot',
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node='original-backing',
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overlay='node0')
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# This should give us the original plain result
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# FIXME: Currently, it yields a json:{} filename even though it
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# only contains a @driver and a @file entry, so a plain
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# filename would obviously suffice. This is fixed by a
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# future patch.
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log_node_info(vm.node_info('node0'))
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vm.qmp_log('blockdev-del', node_name='node0')
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vm.qmp_log('blockdev-del', node_name='original-backing')
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vm.shutdown()
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