File cluster-If-hostname-doesn-t-contain-the-domain-try-to-derive-this-from-FQDN.patch of Package warewulf

From: Egbert Eich <eich@suse.com>
Date: Mon Oct 4 19:42:44 2021 +0200
Subject: cluster: If hostname doesn't contain the domain, try to derive this from FQDN
Patch-mainline: Not yet
Git-commit: fc9adfb41ba29d83fe083248e17c3a2d03d76e16
References: 

SUSE doesn't include the domainname in the hostname. One may still
set the domain name using DNS or /etc/hosts.
Call 'hostname -f' to get the FQDN and try to separate the domain
part from it.

Signed-off-by: Egbert Eich <eich@suse.com>
---
 cluster/libexec/wwinit/30-domain.init | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/cluster/libexec/wwinit/30-domain.init b/cluster/libexec/wwinit/30-domain.init
index ac221a5..300739a 100644
--- a/cluster/libexec/wwinit/30-domain.init
+++ b/cluster/libexec/wwinit/30-domain.init
@@ -33,8 +33,12 @@ fi
 HOSTNAME=`hostname`
 DOMAIN=`echo $HOSTNAME | sed -e 's/^[^\.]*\.//'`
 
-if [ -z "$DOMAIN" -o "$HOSTNAME" == "$DOMAIN" ]; then
-    DOMAIN="cluster"
+if [ -z "$DOMAIN" -o "$HOSTNAME" = "$DOMAIN" ]; then
+    HOSTNAME=`hostname -f`
+    DOMAIN=`echo $HOSTNAME | sed -e 's/^[^\.]*\.//'`
+    if [ -z "$DOMAIN" -o "$HOSTNAME" = "$DOMAIN" ]; then
+	DOMAIN="cluster"
+    fi
 fi
 
 wwprint "Setting default node domain to: \"$DOMAIN\""