Fix Python method descriptors for Python 3.8

https://github.com/rpm-software-management/libcomps/pull/50
https://bugzilla.redhat.com/show_bug.cgi?id=1734777

50.patch

@@ -0,0 +1,50 @@
+From 45d0154a1e0bf167656d1ef4050de782452aad2c Mon Sep 17 00:00:00 2001
+From: Victor Stinner <vstinner@redhat.com>
+Date: Wed, 31 Jul 2019 15:03:36 +0200
+Subject: [PATCH] Fix Python method descriptors for Python 3.8
+
+The Python binding cannot be loaded in Python 3.8: import libcomps
+fails with:
+
+    Traceback (most recent call last):
+      File "src/python/src/python3/libcomps/__init__.py", line 1, in <module>
+        from ._libpycomps import *
+    SystemError: bad call flags
+
+Fedora bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1734777
+
+The problem are the following method descriptors of
+libcomps/src/python/src/pycomps.c:
+
+    {"categories_match", (PyCFunction)PyCOMPS_categories_match, METH_KEYWORDS,
+     PyCOMPS_validate__doc__},
+    {"environments_match", (PyCFunction)PyCOMPS_envs_match, METH_KEYWORDS,
+     PyCOMPS_validate__doc__},
+
+In Python 3.7, import didn't check descriptor flags (METH_KEYWORDS):
+these flags were only checked when the methods were called.
+
+In Python 3.8, the flags are checked at soon as the module is
+imported, which prevents the module to be imported.
+
+This change fix the two method descriptors.
+---
+ libcomps/src/python/src/pycomps.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/libcomps/src/python/src/pycomps.c b/libcomps/src/python/src/pycomps.c
+index b34685c..293a338 100644
+--- a/libcomps/src/python/src/pycomps.c
++++ b/libcomps/src/python/src/pycomps.c
+@@ -766,9 +766,9 @@ PyDoc_STRVAR(PyCOMPS_arch_filter__doc__,
+ static PyMethodDef PyCOMPS_methods[] = {
+     {"groups_match", (PyCFunction)PyCOMPS_groups_match, METH_VARARGS | METH_KEYWORDS,
+     PyCOMPS_validate__doc__},
+-    {"categories_match", (PyCFunction)PyCOMPS_categories_match, METH_KEYWORDS,
++    {"categories_match", (PyCFunction)PyCOMPS_categories_match, METH_VARARGS | METH_KEYWORDS,
+     PyCOMPS_validate__doc__},
+-    {"environments_match", (PyCFunction)PyCOMPS_envs_match, METH_KEYWORDS,
++    {"environments_match", (PyCFunction)PyCOMPS_envs_match, METH_VARARGS | METH_KEYWORDS,
+     PyCOMPS_validate__doc__},
+     {"validate", (PyCFunction)PyCOMPS_validate, METH_NOARGS,
+     PyCOMPS_validate__doc__},

libcomps.spec

@@ -14,12 +14,13 @@
 
 Name:           libcomps
 Version:        0.1.11
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Comps XML file manipulation library
 
 License:        GPLv2+
 URL:            https://github.com/rpm-software-management/libcomps
 Source0:        %{url}/archive/%{name}-%{version}/%{name}-%{version}.tar.gz
+Patch1:         %{url}/pull/50.patch
 
 BuildRequires:  gcc-c++
 BuildRequires:  cmake
@@ -91,7 +92,7 @@ Python3 bindings for libcomps library.
 %endif
 
 %prep
-%autosetup -n %{name}-%{name}-%{version}
+%autosetup -p1 -n %{name}-%{name}-%{version}
 
 %if %{with python2}
 mkdir build-py2
@@ -189,6 +190,9 @@ popd
 %endif
 
 %changelog
+* Wed Jul 31 2019 Miro Hrončok <mhroncok@redhat.com> - 0.1.11-3
+- Fix Python method descriptors for Python 3.8 (#1734777)
+
 * Thu Jul 25 2019 Fedora Release Engineering <releng@fedoraproject.org> - 0.1.11-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild