Fix DNS search entry in /etc/resolv.conf

Commit 66d1235abf2dbc4062ed5bb7aef28d99a5a38eb2 added support for
resolving DNS names from initramfs, but only the DNS domain was
configured for the DNS search. The DHCP client also provides the
`DOMAINSEARCH` variable that should be used for searching if available,
because it can contain more than one domain.

Signed-off-by: Benjamin Drung <benjamin.drung@cloud.ionos.com>

diff --git a/components/9990-networking.sh b/components/9990-networking.sh
index 88bad20..cfafcb0 100755 (executable)
--- a/components/9990-networking.sh
+++ b/components/9990-networking.sh
@@ -156,7 +156,6 @@ EOF
                        if [ -n "${DNSDOMAIN}" ]
                        then
                                echo "domain ${DNSDOMAIN}" > /etc/resolv.conf
-                               echo "search ${DNSDOMAIN}" >> /etc/resolv.conf
                        fi
 
                        for i in ${IPV4DNS0} ${IPV4DNS1} ${IPV4DNS1} ${DNSSERVERS}
@@ -166,6 +165,14 @@ EOF
                                        echo "nameserver $i" >> /etc/resolv.conf
                                fi
                        done
+
+                       if [ -n "${DOMAINSEARCH}" ]
+                       then
+                               echo "search ${DOMAINSEARCH}" >> /etc/resolv.conf
+                       elif [ -n "${DNSDOMAIN}" ]
+                       then
+                               echo "search ${DNSDOMAIN}" >> /etc/resolv.conf
+                       fi
                fi
 
                # Check if we have a network device at all