Fix %python_provide when fed python3.10-foo to obsolete python-foo instead of python--foo

This has unlikely broken anything in practice,
no packages in Fedora use %python_provide with major.minor-version-prefixed names.

Related: rhbz#1950291

macros.python

@@ -74,6 +74,7 @@
   local package = rpm.expand("%{?1}")
   local vr = rpm.expand("%{?epoch:%{epoch}:}%{version}-%{release}")
   local provides = python.python_altprovides(package, vr)
+  local default_python3_pkgversion = rpm.expand("%{__default_python3_pkgversion}")
   if (string.starts(package, "python3-")) then
     for i, provide in ipairs(provides) do
       print("\\nProvides: " .. provide)
@@ -84,14 +85,14 @@
       print(string.sub(package,9,string.len(package)))
       print(" < " .. vr)
     end
-  elseif (string.starts(package, "python" .. rpm.expand("%{__default_python3_pkgversion}") .. "-")) then
+  elseif (string.starts(package, "python" .. default_python3_pkgversion .. "-")) then
     for i, provide in ipairs(provides) do
       print("\\nProvides: " .. provide)
     end
     --Obsoleting the previous default python package (if it doesn't have isa)
     if (string.sub(package, "-1") ~= ")") then
       print("\\nObsoletes: python-")
-      print(string.sub(package,11,string.len(package)))
+      print(string.sub(package,8+string.len(default_python3_pkgversion),string.len(package)))
       print(" < " .. vr)
     end
   elseif (string.starts(package, "python")) then

python-rpm-macros.spec

@@ -1,6 +1,6 @@
 Name:           python-rpm-macros
 Version:        3.9
-Release:        38%{?dist}
+Release:        39%{?dist}
 Summary:        The common Python RPM macros
 URL:            https://src.fedoraproject.org/rpms/python-rpm-macros/
 
@@ -96,6 +96,9 @@ install -m 644 compileall2.py %{buildroot}%{_rpmconfigdir}/redhat/
 
 
 %changelog
+* Tue Jun 15 2021 Miro Hrončok <mhroncok@redhat.com> - 3.9-39
+- Fix %%python_provide when fed python3.10-foo to obsolete python-foo instead of python--foo
+
 * Tue Apr 27 2021 Miro Hrončok <mhroncok@redhat.com> - 3.9-38
 - Escape %% symbols in macro files comments
 - Fixes: rhbz#1953910