tune_sssd.sh: small fixes

dc-client/tune_sssd.sh

@@ -10,8 +10,11 @@ fatal()
     exit 1
 }
 
-epm -q etckeeper || fatal "Install etckeeper for /etc/ before"
-[ -d /etc/.git ] || fatal "initialize /etc with etckeeper init"
+if epm assure etckeeper ; then
+    [ -d /etc/.git ] || fatal "For first, initialize /etc with # etckeeper init"
+else
+    echo "Can't install etckeeper, so skipping it"
+fi
 
 ADMIN=Administrator
 if [ -n "$1" ] ; then
@@ -44,6 +47,13 @@ case $(epm print info -d) in
         ;;
     Fedora|RedOS|GosLinux|CentOS|RHEL)
         epmi --skip installed krb5-workstation ldb-tools sssd-ad samba-common-tools
+        ;;
+    *)
+        fatal "Unsupported distro $(epm print info -d)"
+        ;;
+esac
+
+if [ -d /etc/krb5.conf.d/ ] ; then
 cat <<EOF >/etc/krb5.conf.d/ad
 [libdefaults]
  dns_lookup_kdc = true
@@ -52,11 +62,10 @@ cat <<EOF >/etc/krb5.conf.d/ad
 EOF
 # rdns disabled!
 # See https://bugs.etersoft.ru/show_bug.cgi?id=15473#c13
-        ;;
-    *)
-        fatal "Unsupported distro $(epm print info -d)"
-        ;;
-esac
+else
+    echo "Can't set dns_lookup* in /etc/krb5.conf.d"
+fi
+
 
 if ! which subst 2>/dev/null ; then
 subst()