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>