From f4c25f88b1187bfd1ff73c8f824d9a020716ae79 Mon Sep 17 00:00:00 2001
From: Pino Toscano <ptoscano@redhat.com>
Date: Tue, 22 Jan 2019 13:04:59 +0100
Subject: [PATCH] python: change types for RBufferOut/FBuffer with Python 3
 (RHBZ#1661871)

So far RBufferOut return values, and FBuffer struct fields are 'str' on
all the versions of Python.  Python 3 distinguishes between 'str'
(unicode strings), and 'bytes', with 'str' no more able to hold
arbitrary data.

For this reason, switch the return value of RBufferOut functions, and
FBuffer struct fields to bytes on Python 3: while this is a potentially
incompatibile change, this is the only way to handle safely sequences
of arbitrary bytes.

(cherry picked from commit 0ee02e0117527b86a31b2a88a14994ce7f15571f)
---
 generator/python.ml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/generator/python.ml b/generator/python.ml
index 8fa0b17c0..a75b5f375 100644
--- a/generator/python.ml
+++ b/generator/python.ml
@@ -195,8 +195,13 @@ and generate_python_structs () =
             pr "    goto err;\n";
             pr "  PyDict_SetItemString (dict, \"%s\", value);\n" name;
         | name, FBuffer ->
+            pr "#if PY_MAJOR_VERSION >= 3\n";
+            pr "  value = PyBytes_FromStringAndSize (%s->%s, %s->%s_len);\n"
+              typ name typ name;
+            pr "#else\n";
             pr "  value = guestfs_int_py_fromstringsize (%s->%s, %s->%s_len);\n"
               typ name typ name;
+            pr "#endif\n";
             pr "  if (value == NULL)\n";
             pr "    goto err;\n";
             pr "  PyDict_SetItemString (dict, \"%s\", value);\n" name;
@@ -511,7 +516,11 @@ and generate_python_actions actions () =
            pr "  guestfs_int_free_string_list (r);\n";
            pr "  if (py_r == NULL) goto out;\n";
        | RBufferOut _ ->
+           pr "#if PY_MAJOR_VERSION >= 3\n";
+           pr "  py_r = PyBytes_FromStringAndSize (r, size);\n";
+           pr "#else\n";
            pr "  py_r = guestfs_int_py_fromstringsize (r, size);\n";
+           pr "#endif\n";
            pr "  free (r);\n";
            pr "  if (py_r == NULL) goto out;\n";
       );
-- 
2.20.1