install: use ping -6 if no IPv4 configuration was done

This allows the test to get the IPv6 address from the host even if it
starts with an IPv4 first (in which case the transient IPv4 would be use,
rapidly causing issues).

Signed-off-by: Yann Dirson <yann.dirson@vates.tech>

Author: ydirson

tests/install/conftest.py

@@ -187,6 +187,11 @@ def remastered_iso(installer_iso, answerfile):
     PINGARGS="-c1"
 fi
 
+# detect lack of ipv4 in installed host
+if grep -q "^MODE='none'\\$" /etc/firstboot.d/data/management.conf; then
+    PINGARGS+=" -6"
+fi
+
 ping $PINGARGS "$1"
 EOF
 chmod +x "$INSTALLIMG/usr/local/sbin/test-pingpxe.sh"