tools/python: handle libxl__physmap_info.name properly in convert-legacy-stream

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@aepfle.de>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
(cherry picked from commit c8f88810db2a25d6aacf65c1c60bc4f5d848a483)

diff --git a/tools/python/scripts/convert-legacy-stream b/tools/python/scripts/convert-legacy-stream
index 66ee3d2f5d29973fee838f1c6f39813da98ff27c..227e1b5c3fd3afcaccabe72bff460a012d396af1 100755 (executable)
--- 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, )