[PATCH v7 8/9] 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 in JSON format dump, 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 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tests/qemu-iotests/qcow2_format.py b/tests/qemu-iotests/qcow2_format.py
index a19f3b3..bdd5f68 100644
--- a/tests/qemu-iotests/qcow2_format.py
+++ b/tests/qemu-iotests/qcow2_format.py
@@ -92,6 +92,8 @@ 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]]
@@ -102,7 +104,6 @@ class Qcow2Struct(metaclass=Qcow2StructMeta):
 
             print('{:<25} {}'.format(f[2], value_str))
 
-
 # seek relative to the current position in the file
 FROM_CURRENT = 1
 
@@ -142,6 +143,7 @@ class Qcow2BitmapExt(Qcow2Struct):
 
     def load(self, fd):
         self.read_bitmap_directory(fd)
+        self.fields_dict.update(entries=self.bitmaps)
 
     def dump(self, dump_json=None):
         super().dump(dump_json)
@@ -189,6 +191,7 @@ class Qcow2BitmapDirEntry(Qcow2Struct):
         table_size = self.bitmap_table_bytes * struct.calcsize('Q')
         table = [e[0] for e in struct.iter_unpack('>Q', fd.read(table_size))]
         self.bitmap_table = Qcow2BitmapTable(table)
+        self.fields_dict.update(bitmap_table=self.bitmap_table)
 
     def dump_bitmap_dir_entry(self, dump_json=None):
         print()
-- 
1.8.3.1