Do not remove mdns from nsswitch.conf during upgrade

%post needs to be moved to %posttrans in order to fix the issue
since %postun is run from the old buggy package.

nss-mdns.spec

@@ -1,6 +1,6 @@
 Name: nss-mdns
 Version: 0.14.1
-Release: 6%{?dist}
+Release: 7%{?dist}
 Summary: glibc plugin for .local name resolution
 
 License: LGPLv2+
@@ -40,6 +40,7 @@ rm -rf $RPM_BUILD_ROOT
 %post
 %{?ldconfig}
 
+%posttrans
 function mod_nss() {
     if [ -f "$1" ] ; then
         # sed-fu to add mdns4_minimal to the hosts line of /etc/nsswitch.conf
@@ -73,15 +74,17 @@ function mod_nss() {
     fi
 }
 
-FILE="$(readlink /etc/nsswitch.conf || echo /etc/nsswitch.conf)"
-if [ "$FILE" = "/etc/authselect/nsswitch.conf" ] && authselect check &>/dev/null; then
-    mod_nss "/etc/authselect/user-nsswitch.conf"
-    authselect apply-changes &> /dev/null || :
-else
-    mod_nss "$FILE"
-    # also apply the same changes to user-nsswitch.conf to affect
-    # possible future authselect configuration
-    mod_nss "/etc/authselect/user-nsswitch.conf"
+if [ "$1" -eq 0 ] ; then
+    FILE="$(readlink /etc/nsswitch.conf || echo /etc/nsswitch.conf)"
+    if [ "$FILE" = "/etc/authselect/nsswitch.conf" ] && authselect check &>/dev/null; then
+        mod_nss "/etc/authselect/user-nsswitch.conf"
+        authselect apply-changes &> /dev/null || :
+    else
+        mod_nss "$FILE"
+        # also apply the same changes to user-nsswitch.conf to affect
+        # possible future authselect configuration
+        mod_nss "/etc/authselect/user-nsswitch.conf"
+    fi
 fi
 
 %ldconfig_postun
@@ -94,6 +97,9 @@ fi
 
 
 %changelog
+* Tue Mar 17 2020 Pavel Březina <pbrezina@redhat.com> - 0.14.1-7
+- Do not remove mdns from nsswitch.conf during upgrade
+
 * Wed Jan 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 0.14.1-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild