several minor fixes into spec file

rpm/nginx-ldap-auth.spec

@@ -33,8 +33,7 @@ install -d -m755 %buildroot/etc/default
 install -m644 %name.default %buildroot/etc/default/%name
 install -d -m755 %buildroot/etc/logrotate.d
 install -m644 %name.logrotate %buildroot%_sysconfdir/logrotate.d/%name
-mkdir -p %{buildroot}%{logdir}
-touch  %{buildroot}%{logdir}/daemon.log
+install -d -m755 %{buildroot}%{logdir}
 
 %files
 %doc README.md nginx-ldap-auth.conf backend-sample-app.py LICENSE
@@ -43,18 +42,23 @@ touch  %{buildroot}%{logdir}/daemon.log
 %_bindir/nginx-ldap-auth-daemon
 %_unitdir/%name.service
 %attr(750,nginx-ldap-auth,nginx-ldap-auth) %dir %{logdir}
-%config %ghost %attr(640,nginx-ldap-auth,nginx-ldap-auth) %{logdir}/daemon.log
 
-%post
+%pre
 getent group nginx-ldap-auth > /dev/null || groupadd -r nginx-ldap-auth
 getent passwd nginx-ldap-auth > /dev/null || \
     useradd -r -d /var/lib/nginx -g nginx-ldap-auth \
     -s /sbin/nologin -c "Nginx auth helper" nginx-ldap-auth
-/usr/bin/systemctl preset nginx-ldap-auth.service
+
+%post
+if [ $1 -eq 1 ]; then
+    /usr/bin/systemctl preset nginx-ldap-auth.service >/dev/null 2>&1 ||:
+fi;
 
 %preun
+if [ $1 -eq 0 ]; then
     /usr/bin/systemctl --no-reload disable nginx-ldap-auth.service >/dev/null 2>&1 ||:
     /usr/bin/systemctl stop nginx-ldap-auth.service >/dev/null 2>&1 ||:
+fi;
 
 %postun
 /usr/bin/systemctl daemon-reload >/dev/null 2>&1 ||: