- DHCP Timeout support in the Loader environment

When $NETAUTO=dhcp the transaction will now timeout after $NETRETRIES attempts.
  If the system has a local install or SWI then booting can continue.

  For systems which require DHCP to be functional before booting can continue
  (for example SWIs downloaded via URL rather than locally) then NETRETRIES=infinite should be set in the boot-config.

  NETRETRIES can be set to any number of attempts, or infinite. The default value is 5 attempts.

- Wait for ma1 linkup in the loader
  A short wait has been introduced to allow ma1 to linkup prior to continuing.

packages/base/all/initrds/loader-initrd-files/src/bin/ifup

@@ -25,6 +25,7 @@
 # Configure a network interface from settings in /etc/onl/NET
 # NETDEV: device name
 # NETAUTO: autoconfiguration method ("dhcp" or empty)
+# NETRETRIES: autoconfiguration timeout
 # NETIP: IP address (/prefix optional for v4)
 # NETMASK: netmask (if NETIP has no prefix)
 # NETGW: default gateway IP address (optional)
@@ -43,10 +44,39 @@ if [ "${NETHW}" ]; then
     ip link set dev ${NETDEV} addr ${NETHW}
 fi
 
+# Default DHCP timeout is 10 requests in 10 seconds.
+NETRETRIES_DEFAULT=10
+NETRETRIES=${NETRETRIES:-$NETRETRIES_DEFAULT}
+if [ "$NETRETRIES" = "infinite" ]; then
+    NETRETRIES=
+elif [ $(echo "$NETRETRIES" | tr -d '[:digit:]') ] || [ "$NETRETRIES" -lt 0 ]; then
+    echo "Warning: the NETRETRIES setting is currently '$NETRETRIES'. This is invalid and the default value of $NETRETRIES_DEFAULT will be used instead."
+    NETRETRIES=$NETRETRIES_DEFAULT
+fi
 case "${NETAUTO}" in
     dhcp|auto)
         echo 1 >/proc/sys/net/ipv6/conf/${NETDEV}/autoconf
-        udhcpc -i ${NETDEV}
+        if [ -n "${NETRETRIES}" ]; then
+            if ! udhcpc --retries $NETRETRIES --now -i ${NETDEV}; then
+                echo "**********************************************************************"
+                echo "DHCP failed after $NETRETRIES attempts."
+                echo "**********************************************************************"
+            fi
+        else
+            while true; do
+                if udhcpc --retries $NETRETRIES_DEFAULT --now -i ${NETDEV}; then
+                    break
+                fi
+                echo
+                echo "**********************************************************************"
+                echo "DHCP failed after $NETRETRIES_DEFAULT attempts."
+                echo ""
+                echo "No timeout is configured so DHCP requests will continue until successful."
+                echo "    Press Ctrl-C to terminate and configure manually."
+                echo ""
+                echo "**********************************************************************"
+            done
+        fi
         ;;
     up)
         ifconfig "${NETDEV}" up
@@ -87,3 +117,27 @@ for i in $(seq 30); do
     fi
     sleep 1
 done
+wait_link_up()
+{
+    local intf=$1
+    local count=$2
+
+    local operstate="/sys/class/net/${intf}/operstate"
+
+    echo "Waiting for link on ${intf}..."
+    local i=0
+    [ -r $operstate ] && while [ $i -lt $count ] ; do
+        intf_operstate="$(cat $operstate)"
+        if [ "$intf_operstate" = "up" -o "$intf_operstate" = "unknown" ] ; then
+            echo "${intf}: up"
+            return 0
+        fi
+        usleep 100000
+        i=$(( $i + 1 ))
+    done
+
+    echo "${intf}: down."
+    return 1
+}
+
+wait_link_up $NETDEV 100