Add lua(abi) requirements generator (requires RPM 4.16+)

Any package that installs to /usr/lib(64)/lua/X.Y/ or /usr/share/lua/X.Y/
will require lua(abi) = X.Y.

Co-own the RPM directories to avoid a dependency on RPM (or not owned directory).

lua.attr

@@ -0,0 +1,19 @@
+%__lua_requires() %{lua:
+    -- Match buildroot paths of the form
+    --    /PATH/OF/BUILDROOT/usr/lib(64)/lua/MAJOR.MINOR/ and
+    --    /PATH/OF/BUILDROOT/usr/share/pythonMAJOR.MINOR/
+    -- generating a line of the form:
+    --    lua(abi) = MAJOR.MINOR
+    local path = rpm.expand('%1')
+    local datadir = rpm.expand('%_datadir')
+    local libdir = rpm.expand('%_libdir')
+    for i, dir in ipairs({datadir, libdir}) do
+        if path:match(dir .. '/lua/%d+%.%d+/.*') then
+            local requires = path:gsub('.*' .. dir .. '/lua/(%d+%.%d+)/.*', 'lua(abi) = %1')
+            print(requires)
+            break
+        end
+    end
+}
+
+%__lua_path ^(%{_datadir}|%{_libdir})/lua/[[:digit:]]+\\.[[:digit:]]+/.+

lua.spec

@@ -15,7 +15,7 @@
 
 Name:           lua
 Version:        %{major_version}.0
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Powerful light-weight programming language
 License:        MIT
 URL:            http://www.lua.org/
@@ -30,6 +30,8 @@ Source3:        http://www.lua.org/tests/lua-%{test_version}-tests.tar.gz
 Source4:        luaconf.h
 # rpm-macro
 Source1000:     macros.lua
+# rpm-generator
+Source1001:     lua.attr
 Patch0:         %{name}-5.4.0-beta-autotoolize.patch
 Patch1:         %{name}-5.3.0-idsize.patch
 #Patch2:         %%{name}-5.3.0-luac-shared-link-fix.patch
@@ -173,8 +175,9 @@ rm -rf $RPM_BUILD_ROOT/installdir
 popd
 %endif
 
-# Install rpm-macro
+# Install rpm-macro and requires generator
 install -Dpm 0644 %{SOURCE1000} $RPM_BUILD_ROOT/%{macrosdir}/macros.lua
+install -Dpm 0644 %{SOURCE1001} $RPM_BUILD_ROOT/%{_fileattrsdir}/lua.attr
 
 %files
 %{!?_licensedir:%global license %%doc}
@@ -203,13 +206,19 @@ install -Dpm 0644 %{SOURCE1000} $RPM_BUILD_ROOT/%{macrosdir}/macros.lua
 %{_includedir}/l*.hpp
 %{_libdir}/liblua.so
 %{_libdir}/pkgconfig/*.pc
+%dir %{macrosdir}
 %{macrosdir}/macros.lua
+%dir %{_fileattrsdir}
+%{_fileattrsdir}/lua.attr
 
 %files static
 %{_libdir}/*.a
 
 
 %changelog
+* Tue Jun 30 2020 Miro Hrončok <mhroncok@redhat.com> - 5.4.0-2
+- Add lua(abi) requirements generator (requires RPM 4.16+)
+
 * Mon Jun 29 2020 Tom Callaway <spot@fedoraproject.org> - 5.4.0-1
 - update to 5.4.0