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authorAndrey Shinkevich <andrey.shinkevich@virtuozzo.com>2020-08-06 22:35:56 +0300
committerEric Blake <eblake@redhat.com>2020-08-21 08:56:09 -0500
commit4edcca57412d2b54537b4fc2b10ebfa1b920192c (patch)
treeadc1a6703e58f5a74a22eb269e61108ab08942e1 /tests/qemu-iotests
parentb4e927799cf4a75e4432ab9e94d8f74e906a149b (diff)
downloadqemu-4edcca57412d2b54537b4fc2b10ebfa1b920192c.zip
qcow2_format.py: support dumping metadata in JSON format
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": [ { "type": "serialized", "offset": 655360 }, ... Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <1596742557-320265-11-git-send-email-andrey.shinkevich@virtuozzo.com> Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'tests/qemu-iotests')
-rw-r--r--tests/qemu-iotests/qcow2_format.py17
1 files changed, 17 insertions, 0 deletions
diff --git a/tests/qemu-iotests/qcow2_format.py b/tests/qemu-iotests/qcow2_format.py
index 5a298b2f13..8adc9959e1 100644
--- a/tests/qemu-iotests/qcow2_format.py
+++ b/tests/qemu-iotests/qcow2_format.py
@@ -19,6 +19,15 @@
import struct
import string
+import json
+
+
+class ComplexEncoder(json.JSONEncoder):
+ def default(self, obj):
+ if hasattr(obj, 'to_json'):
+ return obj.to_json()
+ else:
+ return json.JSONEncoder.default(self, obj)
class Qcow2Field:
@@ -110,6 +119,10 @@ class Qcow2Struct(metaclass=Qcow2StructMeta):
for i, field in enumerate(self.fields))
def dump(self, is_json=False):
+ if is_json:
+ print(json.dumps(self.to_json(), indent=4, cls=ComplexEncoder))
+ return
+
for f in self.fields:
value = self.__dict__[f[2]]
if isinstance(f[1], str):
@@ -445,6 +458,10 @@ class QcowHeader(Qcow2Struct):
fd.write(buf)
def dump_extensions(self, is_json=False):
+ if is_json:
+ print(json.dumps(self.extensions, indent=4, cls=ComplexEncoder))
+ return
+
for ex in self.extensions:
print('Header extension:')
ex.dump()