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qubes/storage: allow snapshots of snapshots

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It may make sense to create 'snapshot' volume out of already 'snapshot',
not only 'origin'. In pracice it will exactly the same as 'snapshot
connected directly to 'origin'.

QubesOS/qubes-issues#866
This commit is contained in:
Marek Marczykowski-Górecki 2016-05-20 03:50:26 +02:00 committed by Wojtek Porczyk
parent 48176d51f1
commit 54c70766a4
1 changed files with 19 additions and 5 deletions
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24
qubes/storage/file.py
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@ -237,13 +237,27 @@ class FilePool(Pool):
raise StoragePoolException("Unknown volume type " + volume_type)
if volume_type in ['snapshot', 'read-only']:
origin_pool = vm.app.get_pool(
vm.template.volume_config[name]['pool'])
name = volume_config['name']
origin_vm = vm
while hasattr(origin_vm, 'template') and \
origin_vm.volume_config[name]['volume_type'] == \
volume_type:
origin_vm = origin_vm.template
expected_origin_type = {
'snapshot': 'origin',
'read-only': 'read-write', # FIXME: really?
}[volume_type]
assert origin_vm.volume_config[name]['volume_type'] == \
expected_origin_type
origin_pool = vm.app.get_pool(origin_vm.volume_config[name]['pool'])
assert isinstance(origin_pool,
FilePool), 'Origin volume not a file volume'
volume_config['target_dir'] = origin_pool.target_dir(vm.template)
name = volume_config['name']
volume_config['size'] = vm.template.volume_config[name]['size']
volume_config['target_dir'] = origin_pool.target_dir(origin_vm)
volume_config['size'] = origin_vm.volume_config[name]['size']
else:
volume_config['target_dir'] = self.target_dir(vm)