@@ -19,6 +19,15 @@
import struct
import string
+import json
+
+
+class ComplexEncoder(json.JSONEncoder):
+ def default(self, obj):
+ if hasattr(obj, 'get_fields_dict'):
+ return obj.get_fields_dict()
+ else:
+ return json.JSONEncoder.default(self, obj)
class Qcow2Field:
@@ -112,6 +121,11 @@ class Qcow2Struct(metaclass=Qcow2StructMeta):
self.fields_dict = self.__dict__.copy()
def dump(self, dump_json=None):
+ if dump_json:
+ print(json.dumps(self.get_fields_dict(), indent=4,
+ cls=ComplexEncoder))
+ return
+
for f in self.fields:
value = self.__dict__[f[2]]
if isinstance(f[1], str):
@@ -149,6 +163,9 @@ class Qcow2BitmapExt(Qcow2Struct):
print()
entry.dump()
+ def get_fields_dict(self):
+ return self.fields_dict
+
class Qcow2BitmapDirEntry(Qcow2Struct):
@@ -194,6 +211,11 @@ class Qcow2BitmapDirEntry(Qcow2Struct):
super(Qcow2BitmapDirEntry, self).dump()
self.bitmap_table.dump()
+ def get_fields_dict(self):
+ bmp_name = dict(name=self.name)
+ bme_dict = {**bmp_name, **self.fields_dict}
+ return bme_dict
+
class Qcow2BitmapTableEntry:
@@ -209,6 +231,9 @@ class Qcow2BitmapTableEntry:
else:
self.type = 'all-zeroes'
+ def get_fields_dict(self):
+ return dict(type=self.type, offset=self.offset)
+
class Qcow2BitmapTable:
@@ -225,6 +250,18 @@ class Qcow2BitmapTable:
for i, entry in bitmap_table:
print(f'{i:<14} {entry.type:<15} {entry.offset:<24} {size}')
+ def get_fields_dict(self):
+ return dict(entries=self.entries)
+
+
+class Qcow2HeaderExtensionsDoc:
+
+ def __init__(self, extensions):
+ self.extensions = extensions
+
+ def get_fields_dict(self):
+ return dict(Header_extensions=self.extensions)
+
QCOW2_EXT_MAGIC_BITMAPS = 0x23852875
@@ -240,6 +277,9 @@ class QcowHeaderExtension(Qcow2Struct):
0x44415441: 'Data file'
}
+ def get_fields_dict(self):
+ return self.mapping.get(self.value, "<unknown>")
+
fields = (
('u32', Magic, 'magic'),
('u32', '{}', 'length')
@@ -305,6 +345,16 @@ class QcowHeaderExtension(Qcow2Struct):
else:
self.obj.dump(dump_json)
+ def get_fields_dict(self):
+ ext_name = dict(name=self.Magic(self.magic))
+ he_dict = {**ext_name, **self.fields_dict}
+ if self.obj is not None:
+ he_dict.update(data=self.obj)
+ else:
+ he_dict.update(data_str=self.data_str)
+
+ return he_dict
+
@classmethod
def create(cls, magic, data):
return QcowHeaderExtension(magic, len(data), data)
@@ -403,7 +453,16 @@ class QcowHeader(Qcow2Struct):
fd.write(buf)
def dump_extensions(self, dump_json=None):
+ if dump_json:
+ ext_doc = Qcow2HeaderExtensionsDoc(self.extensions)
+ print(json.dumps(ext_doc.get_fields_dict(), indent=4,
+ cls=ComplexEncoder))
+ return
+
for ex in self.extensions:
print('Header extension:')
ex.dump(dump_json)
print()
+
+ def get_fields_dict(self):
+ return self.fields_dict
Implementation of dumping QCOW2 image metadata. The sample output: { "Header_extensions": [ { "name": "Feature table", "magic": 1745090647, "length": 192, "data_str": "<binary>" }, { "name": "Bitmaps", "magic": 595929205, "length": 24, "data": { "nb_bitmaps": 2, "reserved32": 0, "bitmap_directory_size": 64, "bitmap_directory_offset": 1048576, "bitmap_directory": [ { "name": "bitmap-1", "bitmap_table_offset": 589824, "bitmap_table_size": 1, "flags": 2, "type": 1, "granularity_bits": 15, "name_size": 8, "extra_data_size": 0, "bitmap_table": { "entries": [ { "type": "serialized", "offset": 655360 }, ... Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> --- tests/qemu-iotests/qcow2_format.py | 59 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+)