Use systemd-sysusers for frr user and frrvty group

This complies with the new guidelines on user/group creation

Reference: https://docs.fedoraproject.org/en-US/packaging-guidelines/UsersAndGroups/#_dynamic_allocation

frr-sysusers.conf

@@ -0,0 +1,4 @@
+#Type Name   ID     GECOS                        Home directory  Shell
+g     frrvty -
+u     frr    -      "FRRouting routing suite"    /var/run/frr    /sbin/nologin
+m     frr    frrvty

frr.spec

@@ -11,6 +11,7 @@ License:        GPLv2+
 URL:            http://www.frrouting.org
 Source0:        https://github.com/FRRouting/frr/releases/download/%{name}-%{version}/%{name}-%{version}.tar.gz
 Source1:        %{name}-tmpfiles.conf
+Source2:        %{name}-sysusers.conf
 
 Patch0000:      0000-remove-babeld-and-ldpd.patch
 Patch0001:      0001-use-python3.patch
@@ -50,11 +51,13 @@ BuildRequires:  readline
 BuildRequires:  readline-devel
 BuildRequires:  systemd
 BuildRequires:  systemd-devel
+BuildRequires:  systemd-rpm-macros
 BuildRequires:  texinfo
 
 Requires:       ncurses
 Requires:       net-snmp
 Requires(post): hostname
+%{?sysusers_requires_compat}
 Requires(post): systemd
 Requires(postun): systemd
 Requires(preun): systemd
@@ -113,6 +116,7 @@ mkdir -p %{buildroot}%{_sysconfdir}/{frr,rc.d/init.d,sysconfig,logrotate.d,pam.d
 
 mkdir -p -m 0755 %{buildroot}%{_libdir}/frr
 mkdir -p %{buildroot}%{_tmpfilesdir}
+mkdir -p %{buildroot}%{_sysusersdir}
 
 %make_install
 
@@ -120,6 +124,7 @@ mkdir -p %{buildroot}%{_tmpfilesdir}
 rm -rf %{buildroot}%{_infodir}/dir
 
 install -p -m 644 %{SOURCE1} %{buildroot}%{_tmpfilesdir}/%{name}.conf
+install -p -m 644 %{SOURCE2} %{buildroot}%{_sysusersdir}/%{name}.conf
 install -p -m 644 tools/etc/frr/daemons %{buildroot}%{_sysconfdir}/frr/daemons
 install -p -m 644 tools/frr.service %{buildroot}%{_unitdir}/frr.service
 install -p -m 755 tools/frrinit.sh %{buildroot}%{frr_libdir}/frr
@@ -138,11 +143,8 @@ rm %{buildroot}%{_libdir}/frr/*.so
 rm -r %{buildroot}%{_includedir}/frr/
 
 %pre
-getent group frrvty >/dev/null 2>&1 || groupadd -r frrvty >/dev/null 2>&1 || :
+%sysusers_create_compat %{SOURCE2}
-getent group frr >/dev/null 2>&1 || groupadd -r frr >/dev/null 2>&1 || :
+
-getent passwd frr >/dev/null 2>&1 || useradd -M -r -g frr -s /sbin/nologin \
- -c "FRRouting routing suite" -d %{_localstatedir}/run/frr frr || :
-usermod -aG frrvty frr
 
 %post
 %systemd_post frr.service
@@ -200,11 +202,13 @@ fi
 %dir %{_datadir}/yang
 %{_datadir}/yang/*.yang
 %{_tmpfilesdir}/%{name}.conf
+%{_sysusersdir}/%{name}.conf
 
 %changelog
 * Wed Jul 07 2021 Neal Gompa <ngompa@datto.com> - 7.5.1-5
 - Clean up the spec file for legibility and modern spec standards
 - Remove unneeded info scriptlets
+- Use systemd-sysusers for frr user and frrvty group
 
 * Wed Jul 07 2021 Michal Ruprich <mruprich@redhat.com> - 7.5.1-4
 - Rebuild for newer abseil-cpp