[PATCH 1/5] tools/python: handle libxl__physmap_info.name properly in convert-legacy-stream

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

From: Olaf Hering <olaf@xxxxxxxxx>

The trailing member name[] in libxl__physmap_info is written as a
cstring into the stream. The current code does a sanity check if the
last byte is zero. This attempt fails with python3 because name[-1]
returns a type int. As a result the comparison with byte(\00) fails:

  File "/usr/lib/xen/bin/convert-legacy-stream", line 347, in 
read_libxl_toolstack
    raise StreamError("physmap name not NUL terminated")
  StreamError: physmap name not NUL terminated

To handle both python variants, cast to bytearray().

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 tools/python/scripts/convert-legacy-stream | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/python/scripts/convert-legacy-stream 
b/tools/python/scripts/convert-legacy-stream
index 66ee3d2f5d29..227e1b5c3fd3 100755
--- a/tools/python/scripts/convert-legacy-stream
+++ b/tools/python/scripts/convert-legacy-stream
@@ -343,7 +343,7 @@ def read_libxl_toolstack(vm, data):
         if twidth == 64:
             name = name[:-4]
 
-        if name[-1] != b'\x00':
+        if bytearray(name)[-1] != 0:
             raise StreamError("physmap name not NUL terminated")
 
         root = b"physmap/%x" % (phys, )
-- 
2.11.0