[PATCH v10 09/10] qcow2_format.py: collect fields to dump in JSON format

[Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>]

As __dict__ is being extended with class members we do not want to
print, make a light copy of the initial __dict__ and extend the copy
by adding lists we have to print in the JSON output.

Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
---
 tests/qemu-iotests/qcow2_format.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/qemu-iotests/qcow2_format.py b/tests/qemu-iotests/qcow2_format.py
index e0e14b5..83c3482 100644
--- a/tests/qemu-iotests/qcow2_format.py
+++ b/tests/qemu-iotests/qcow2_format.py
@@ -109,6 +109,8 @@ class Qcow2Struct(metaclass=Qcow2StructMeta):
         self.__dict__ = dict((field[2], values[i])
                              for i, field in enumerate(self.fields))
 
+        self.fields_dict = self.__dict__.copy()
+
     def dump(self, dump_json=None):
         for f in self.fields:
             value = self.__dict__[f[2]]
@@ -144,6 +146,7 @@ class Qcow2BitmapExt(Qcow2Struct):
         self.bitmap_directory = \
             [Qcow2BitmapDirEntry(fd, cluster_size=self.cluster_size)
              for _ in range(self.nb_bitmaps)]
+        self.fields_dict.update(bitmap_directory=self.bitmap_directory)
 
     def dump(self, dump_json=None):
         super().dump(dump_json)
@@ -189,6 +192,7 @@ class Qcow2BitmapDirEntry(Qcow2Struct):
         table = [e[0] for e in struct.iter_unpack('>Q', fd.read(table_size))]
         self.bitmap_table = Qcow2BitmapTable(raw_table=table,
                                              cluster_size=self.cluster_size)
+        self.fields_dict.update(bitmap_table=self.bitmap_table)
 
     def dump(self, dump_json=None):
         print(f'{"Bitmap name":<25} {self.name}')
-- 
1.8.3.1