force disable IPv6 if IPV6_METHOD = none (#9277)

* Enhance IPv6 disabling logic in install script

Updated verb_ip6 to check both IPV6_METHOD and DISABLEIPV6 variables. Added disabling for all, default, and loopback interfaces, improved messaging, and redirected sysctl output to /dev/null for cleaner logs.

* Improve IPv6 disabling logic in install scripts

Updated both alpine-install.func and install.func to enhance IPv6 disabling by checking IPV6_METHOD and adding more sysctl settings. Also improved messaging and removed suppression of sysctl output in install.func.

Author: MickLesk

misc/alpine-install.func

@@ -13,10 +13,16 @@ load_functions
 verb_ip6() {
   set_std_mode # Set STD mode based on VERBOSE
 
-  if [ "$DISABLEIPV6" == "yes" ]; then
+  if [ "$IPV6_METHOD" == "none" ] || [ "$DISABLEIPV6" == "yes" ]; then
+    msg_info "Disabling IPv6"
     $STD sysctl -w net.ipv6.conf.all.disable_ipv6=1
+    $STD sysctl -w net.ipv6.conf.default.disable_ipv6=1
+    $STD sysctl -w net.ipv6.conf.lo.disable_ipv6=1
     echo "net.ipv6.conf.all.disable_ipv6 = 1" >>/etc/sysctl.conf
+    echo "net.ipv6.conf.default.disable_ipv6 = 1" >>/etc/sysctl.conf
+    echo "net.ipv6.conf.lo.disable_ipv6 = 1" >>/etc/sysctl.conf
     $STD rc-update add sysctl default
+    msg_ok "Disabled IPv6"
   fi
 }
 

misc/install.func

@@ -15,9 +15,13 @@ load_functions
 verb_ip6() {
   set_std_mode # Set STD mode based on VERBOSE
 
-  if [ "$DISABLEIPV6" == "yes" ]; then
-    echo "net.ipv6.conf.all.disable_ipv6 = 1" >>/etc/sysctl.conf
+  if [ "$IPV6_METHOD" == "none" ] || [ "$DISABLEIPV6" == "yes" ]; then
+    msg_info "Disabling IPv6"
+    $STD echo "net.ipv6.conf.all.disable_ipv6 = 1" >>/etc/sysctl.conf
+    $STD echo "net.ipv6.conf.default.disable_ipv6 = 1" >>/etc/sysctl.conf
+    $STD echo "net.ipv6.conf.lo.disable_ipv6 = 1" >>/etc/sysctl.conf
     $STD sysctl -p
+    msg_ok "Disabled IPv6"
   fi
 }