Reimplement pythondeps.sh as parametric macro generators

pythondeps.sh was written in shell and unlike the Python dist generators,
it uses no Python, it plainly determines the provide / requires from the path.
As the script was run for every Python file, we were potentially doing hundreds
of shelling outs to execute a script that calls grep and sed.

In Lua, this is much more efficient.

Some timings:
    https://github.com/rpm-software-management/rpm/pull/1153#issuecomment-607146356

Parametric macro generators require RPM 4.16+:
    https://fedoraproject.org/wiki/Changes/RPM-4.16

Fixes https://github.com/rpm-software-management/rpm/issues/1152
Upstream PR: https://github.com/rpm-software-management/rpm/pull/1153

Since this is intended for Fedora 33+ only, clean some old cruft.

python-rpm-generators.spec

@@ -1,11 +1,7 @@
-# Disable automatic bytecompilation. We install only one script and we will
-# never "import" it.
-%undefine py_auto_byte_compile
-
 Name:           python-rpm-generators
 Summary:        Dependency generators for Python RPMs
-Version:        10
+Version:        11
-Release:        4%{?dist}
+Release:        1%{?dist}
 
 # Originally all those files were part of RPM, so license is kept here
 License:        GPLv2+
@@ -14,8 +10,7 @@ Url:            https://src.fedoraproject.org/python-rpm-generators
 Source0:        https://raw.githubusercontent.com/rpm-software-management/rpm/102eab50b3d0d6546dfe082eac0ade21e6b3dbf1/COPYING
 Source1:        python.attr
 Source2:        pythondist.attr
-Source3:        pythondeps.sh
+Source3:        pythondistdeps.py
-Source4:        pythondistdeps.py
 
 BuildArch:      noarch
 
@@ -25,10 +20,8 @@ BuildArch:      noarch
 %package -n python3-rpm-generators
 Summary:        %{summary}
 Requires:       python3-setuptools
-# The point of split
+# We have parametric macro generators, we need RPM 4.16 (4.15.90+ is 4.16 alpha)
-Conflicts:      rpm-build < 4.13.0.1-2
+Requires:       rpm > 4.15.90-0
-# Breaking change, change a way how depgen is enabled
-Conflicts:      python-rpm-macros < 3-35
 
 %description -n python3-rpm-generators
 %{summary}.
@@ -39,16 +32,19 @@ cp -a %{sources} .
 
 %install
 install -Dpm0644 -t %{buildroot}%{_fileattrsdir} python.attr pythondist.attr
-install -Dpm0755 -t %{buildroot}%{_rpmconfigdir} pythondeps.sh pythondistdeps.py
+install -Dpm0755 -t %{buildroot}%{_rpmconfigdir} pythondistdeps.py
 
 %files -n python3-rpm-generators
 %license COPYING
 %{_fileattrsdir}/python.attr
 %{_fileattrsdir}/pythondist.attr
-%{_rpmconfigdir}/pythondeps.sh
 %{_rpmconfigdir}/pythondistdeps.py
 
 %changelog
+* Wed Apr 01 2020 Miro Hrončok <mhroncok@redhat.com> - 11-1
+- Rewrite python(abi) generators to Lua to make them faster
+- RPM 4.16+ is needed
+
 * Thu Jan 30 2020 Fedora Release Engineering <releng@fedoraproject.org> - 10-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild
 

python.attr

@@ -1,4 +1,28 @@
-%__python_provides	%{_rpmconfigdir}/pythondeps.sh --provides
+%__python_provides() %{lua:
-%__python_requires	%{_rpmconfigdir}/pythondeps.sh --requires
+    -- Match buildroot/payload paths of the form
+    --    /PATH/OF/BUILDROOT/usr/bin/pythonMAJOR.MINOR
+    -- generating a line of the form
+    --    python(abi) = MAJOR.MINOR
+    -- (Don't match against -config tools e.g. /usr/bin/python2.6-config)
+    local path = rpm.expand('%1')
+    if path:match('/usr/bin/python%d+%.%d+$') then
+        provides = path:gsub('.*/usr/bin/python(%d+%.%d+)', 'python(abi) = %1')
+        print(provides)
+    end
+}
+
+%__python_requires() %{lua:
+    -- Match buildroot paths of the form
+    --    /PATH/OF/BUILDROOT/usr/lib/pythonMAJOR.MINOR/  and
+    --    /PATH/OF/BUILDROOT/usr/lib64/pythonMAJOR.MINOR/
+    -- generating a line of the form:
+    --    python(abi) = MAJOR.MINOR
+    local path = rpm.expand('%1')
+    if path:match('/usr/lib%d*/python%d+%.%d+/.*') then
+        requires = path:gsub('.*/usr/lib%d*/python(%d+%.%d+)/.*', 'python(abi) = %1')
+        print(requires)
+    end
+}
+
 %__python_path	^((/usr/lib(64)?/python[[:digit:]]\\.[[:digit:]]+/.*\\.(py[oc]?|so))|(^%{_bindir}/python[[:digit:]]\\.[[:digit:]]+))$
 %__python_magic		[Pp]ython.*(executable|byte-compiled)

pythondeps.sh

@@ -1,32 +0,0 @@
-#!/bin/bash
-
-[ $# -ge 1 ] || {
-    cat > /dev/null
-    exit 0
-}
-
-case $1 in
--P|--provides)
-    shift
-    # Match buildroot/payload paths of the form
-    #    /PATH/OF/BUILDROOT/usr/bin/pythonMAJOR.MINOR
-    # generating a line of the form
-    #    python(abi) = MAJOR.MINOR
-    # (Don't match against -config tools e.g. /usr/bin/python2.6-config)
-    grep "/usr/bin/python.\..$" \
-        | sed -e "s|.*/usr/bin/python\(.\..\)|python(abi) = \1|"
-    ;;
--R|--requires)
-    shift
-    # Match buildroot paths of the form
-    #    /PATH/OF/BUILDROOT/usr/lib/pythonMAJOR.MINOR/  and
-    #    /PATH/OF/BUILDROOT/usr/lib64/pythonMAJOR.MINOR/
-    # generating (uniqely) lines of the form:
-    #    python(abi) = MAJOR.MINOR
-    grep "/usr/lib[^/]*/python.\../.*" \
-        | sed -e "s|.*/usr/lib[^/]*/python\(.\..\)/.*|python(abi) = \1|g" \
-        | sort | uniq
-    ;;
-esac
-
-exit 0