Implement alternatives

python3.12-numpy.spec

@@ -69,6 +69,13 @@ Requires:       python%{python3_pkgversion}-numpy%{?_isa} = %{version}-%{release
 Requires:       python%{python3_pkgversion}-devel
 Provides:       python%{python3_pkgversion}-f2py = %{version}-%{release}
 
+# Require alternatives version that implements the --keep-foreign flag and fixes rhbz#2203820
+Requires(postun): alternatives >= 1.19.2-1
+# python3.12 installs the alternatives master symlink to which we attach a slave
+Requires: python%{python3_pkgversion}
+Requires(post): python%{python3_pkgversion}
+Requires(postun): python%{python3_pkgversion}
+
 %description -n python%{python3_pkgversion}-numpy-f2py
 This package includes a version of f2py that works properly with NumPy.
 
@@ -108,6 +115,10 @@ rm f2py
 rm f2py3
 popd &> /dev/null
 
+# All ghost files controlled by alternatives need to exist for the files
+# section check to succeed
+touch %{buildroot}%{_bindir}/f2py3
+
 # distutils from setuptools don't have the patch that was created to avoid standard runpath here
 # we strip it manually instead
 # ERROR   0001: file '...' contains a standard runpath '/usr/lib64' in [/usr/lib64]
@@ -133,6 +144,19 @@ export PYTHONPATH=%{buildroot}%{python3_sitearch}
 
 %endif
 
+%post -n python%{python3_pkgversion}-numpy-f2py
+alternatives --add-slave python3 %{_bindir}/python%{python3_version} \
+    %{_bindir}/f2py3 \
+    f2py3 \
+    %{_bindir}/f2py%{python3_version}
+
+%postun -n python%{python3_pkgversion}-numpy-f2py
+# Do this only during uninstall process (not during update)
+if [ $1 -eq 0 ]; then
+   alternatives --keep-foreign --remove-slave python3 %{_bindir}/python%{python3_version} \
+       f2py3
+fi
+
 
 %files -n python%{python3_pkgversion}-numpy
 %license LICENSE.txt
@@ -165,6 +189,7 @@ export PYTHONPATH=%{buildroot}%{python3_sitearch}
 
 %files -n python%{python3_pkgversion}-numpy-f2py
 %{_bindir}/f2py%{python3_version}
+%ghost %{_bindir}/f2py3
 %{python3_sitearch}/%{modname}/f2py
 
 %changelog