Brand as "3.8", rework %python_provide

- Hardcode the default Python 3 version in the SRPM macros
- Provide python38-foo for python3-foo and the other way around (future RHEL compatibility)

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1812087

    $ rpm --eval '%python_provide python38-setuptools'
    Provides: python-setuptools = %{version}-%{release}
    Provides: python3-setuptools = %{version}-%{release}
    Obsoletes: python-setuptools < %{version}-%{release}

    $ rpm --eval '%python_provide python3-setuptools'
    Provides: python-setuptools = %{version}-%{release}
    Provides: python38-setuptools = %{version}-%{release}
    Obsoletes: python-setuptools < %{version}-%{release}

    $ rpm --eval '%python_provide python39-setuptools'

    $ rpm --define 'python3_pkgversion 39' --eval '%python_provide python%{python3_pkgversion}-setuptools'

To make the implementation of %python_provide easier,
any names starting with "python" or "pypy" are recognized as valid arguments.

Previously, this was an ERROR:

    $ rpm --eval '%python_provide pythonista'
    %python_provide: ERROR: pythonista not recognized.

Now it is a no-op. The behavior was never documented and the change is
backwards compatible for working spec files.

macros.python

@@ -52,11 +52,29 @@
   end
   package = rpm.expand("%{?1}")
   vr = rpm.expand("%{?epoch:%{epoch}:}%{version}-%{release}")
-  if (string.starts(package, "python2-")) then
-    --No unversioned provides as python2 is not default
-  elseif (string.starts(package, "python" .. rpm.expand("%{python3_pkgversion}") .. "-")) then
+  if (string.starts(package, "python3-")) then
     print("\\nProvides: python-")
-    l = 8 + string.len(rpm.expand("%{python3_pkgversion}"))
+    print(string.sub(package,9,string.len(package)))
+    print(" = ")
+    print(vr)
+    print("\\nProvides: python" .. rpm.expand("%{__default_python3_pkgversion}") .. "-")
+    print(string.sub(package,9,string.len(package)))
+    print(" = ")
+    print(vr)
+    --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,9,string.len(package)))
+      print(" < ")
+      print(vr)
+    end
+  elseif (string.starts(package, "python" .. rpm.expand("%{__default_python3_pkgversion}") .. "-")) then
+    print("\\nProvides: python-")
+    l = 8 + string.len(rpm.expand("%{__default_python3_pkgversion}"))
+    print(string.sub(package,l,string.len(package)))
+    print(" = ")
+    print(vr)
+    print("\\nProvides: python3-")
     print(string.sub(package,l,string.len(package)))
     print(" = ")
     print(vr)
@@ -67,16 +85,10 @@
       print(" < ")
       print(vr)
     end
-  elseif (rpm.expand("%{?python3_other_pkgversion}") ~= "" and string.starts(package, "python" .. rpm.expand("%{python3_other_pkgversion}") .. "-")) then
-    --No unversioned provides as python3_other is not default
-  elseif (string.starts(package, "pypy-")) then
-    --No unversioned provides as pypy is not default
-  elseif (string.starts(package, "pypy2-")) then
-    --No unversioned provides as pypy is not default
-  elseif (string.starts(package, "pypy3-")) then
-    --No unversioned provides as pypy is not default
-  elseif (string.starts(package, "python-")) then
-    --No unversioned provides needed for unversioned python
+  elseif (string.starts(package, "python")) then
+    --No unversioned provides as other python3 cases are not the default
+  elseif (string.starts(package, "pypy")) then
+    --No unversioned provides as pypy is not default either
   else
     print("%python_provide: ERROR: ")
     print(package)

macros.python-srpm

@@ -25,6 +25,11 @@
     end\
 }
 
+# This specifies what packages are equal to the python3-... packages, in python_provide macro
+# E.g. in Fedora 32, python38-foo will provide python3-foo and vice versa
+%__default_python3_version 3.8
+%__default_python3_pkgversion %(echo %__default_python3_version | sed 's/\\.//')
+
 # python3_pkgversion specifies the version of Python 3 in the distro.  It can be
 # a specific version (e.g. 34 in Fedora EPEL7)
 %python3_pkgversion 3

python-rpm-macros.spec

@@ -1,7 +1,7 @@
 Name:           python-rpm-macros
-Version:        3
-Release:        54%{?dist}
-Summary:        The unversioned Python RPM macros
+Version:        3.8
+Release:        1%{?dist}
+Summary:        The common Python RPM macros
 
 # macros: MIT, compileall2.py: PSFv2
 License:        MIT and Python
@@ -78,6 +78,11 @@ install -m 644 %{SOURCE5} \
 
 
 %changelog
+* Mon Mar 23 2020 Miro Hrončok <mhroncok@redhat.com> - 3.8-1
+- Hardcode the default Python 3 version in the SRPM macros (#1812087)
+- Provide python38-foo for python3-foo and the other way around (future RHEL compatibility)
+- %%python_provide: Allow any names starting with "python" or "pypy"
+
 * Mon Feb 10 2020 Miro Hrončok <mhroncok@redhat.com> - 3-54
 - Update of bundled compileall2 module to 0.7.0
   Adds the optional --hardlink-dupes flag for compileall2 for pyc deduplication