use alternatives for man.7

man-pages.spec

@@ -7,7 +7,7 @@
 Summary: Linux kernel and C library user-space interface documentation
 Name: man-pages
 Version: 5.04
-Release: 3%{?dist}
+Release: 4%{?dist}
 License: GPL+ and GPLv2+ and BSD and MIT and Copyright only and IEEE
 URL: http://www.kernel.org/doc/man-pages/
 Source: http://www.kernel.org/pub/linux/docs/man-pages/man-pages-%{version}.tar.xz
@@ -16,6 +16,10 @@ Source1: http://www.kernel.org/pub/linux/docs/man-pages/man-pages-posix/%{posix_
 # additional man-pages, the source tarball is fedora/rhel only
 Source2: %{additional_name}.tar.xz
 
+Requires(post): %{_sbindir}/update-alternatives
+Requires(postun): %{_sbindir}/update-alternatives
+Requires(preun): %{_sbindir}/update-alternatives
+
 # attr.5 man page was moved from attr to man-pages in attr-2.4.47-11
 Conflicts: attr < 2.4.47-11
 
@@ -82,12 +86,37 @@ pushd %{additional_name}
 make install DESTDIR=$RPM_BUILD_ROOT
 popd
 
+# rename files for alternative usage
+mv %{buildroot}%{_mandir}/man7/man.7 %{buildroot}%{_mandir}/man7/man.%{name}.7
+touch %{buildroot}%{_mandir}/man7/man.7
+
+%post
+# set up the alternatives files
+%{_sbindir}/update-alternatives --install %{_mandir}/man7/man.7.gz man.7.gz %{_mandir}/man7/man.%{name}.7.gz 300 \
+    >/dev/null 2>&1 || :
+
+%preun
+if [ $1 -eq 0 ]; then
+    %{_sbindir}/update-alternatives --remove man.7.gz %{_mandir}/man7/man.%{name}.7.gz >/dev/null 2>&1 || :
+fi
+
+%postun
+if [ $1 -ge 1 ]; then
+    if [ "$(+readlink %{_sysconfdir}/alternatives/man.7.gz+)" == "%{_mandir}/man7/man.%{name}.7.gz" ]; then
+        %{_sbindir}/update-alternatives --set man.7.gz %{_mandir}/man7/man.%{name}.7.gz >/dev/null 2>&1 || :
+    fi
+fi
+
 %files
 %doc README man-pages-%{version}.Announce Changes
 %doc %{posix_name}/POSIX-COPYRIGHT %{posix_name}/%{posix_name}.{README,Announce}
+%ghost %{_mandir}/man7/man.7*
 %{_mandir}/man*/*
 
 %changelog
+* Thu Feb 27 2020 Nikola Forró <nforro@redhat.com> - 5.04-4
+- use alternatives for man.7
+
 * Mon Feb 03 2020 Nikola Forró <nforro@redhat.com> - 5.04-3
 - add kernel_lockdown.7 man page
   resolves: #1797591