[PATCH 1/2] dhclient: not always skip the nfsroot interface

["Yu, Mingli" <mingli.yu@windriver.com>]

From: Mingli Yu <mingli.yu@windriver.com>

Don't skip the nfsroot interface when use dhcp
to get the address for nfsroot interface as the
nfsroot interface may need dhclient to renew
the lease.

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
---
 .../dhcp/files/dhclient-systemd-wrapper            | 26 +++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/meta/recipes-connectivity/dhcp/files/dhclient-systemd-wrapper b/meta/recipes-connectivity/dhcp/files/dhclient-systemd-wrapper
index 7d0e224..87c60fa 100644
--- a/meta/recipes-connectivity/dhcp/files/dhclient-systemd-wrapper
+++ b/meta/recipes-connectivity/dhcp/files/dhclient-systemd-wrapper
@@ -1,5 +1,19 @@
 #!/bin/sh
 
+# Add an initial /var/lib/dhcp/dhclient.leases to make
+# sure the IP which dhclient try to renew is the same
+# with the IP which kernel got from dhcp server during
+# boot
+update_dhclient_leases()
+{
+    local addr=$1
+    local interface=$2
+    echo "lease {" >> /var/lib/dhcp/dhclient.leases
+    echo "  interface \"${addr}\";" >> /var/lib/dhcp/dhclient.leases
+    echo "  fixed-address ${interface:0:-3};" >> /var/lib/dhcp/dhclient.leases
+    echo "}" >> /var/lib/dhcp/dhclient.leases
+}
+
 # In case the interface is used for nfs, skip it.
 nfsroot=0
 interfaces=""
@@ -19,6 +33,7 @@ while read dev mtpt fstype rest; do
 done
 exec 0<&9 9<&-
 
+
 if [ $nfsroot -eq 0 ]; then
     interfaces="$INTERFACES"
 else
@@ -27,7 +42,16 @@ else
     fi
     for i in $INTERFACES; do
 	if test "x$i" = "x$nfs_iface"; then
-            echo "dhclient skipping nfsroot interface $i"
+            interface_addr=`ip -4 address show $nfs_iface | grep 'inet '|sed 's/.*inet \(\S\+\).*/\1/'`
+            if [ "x$interface_addr" != "x" ] && cat /proc/cmdline | grep "ip=dhcp" > /dev/null ; then
+                # use to renew lease if needed
+                interfaces="$interfaces $i"
+                # use to update /var/lib/dhcp/dhclient.leases if needed
+                # when the ip got by kernel, we need use dhclient to renew the ip
+                update_dhclient_leases $nfs_iface $interface_addr
+            else
+                echo "dhclient skipping nfsroot interface $i"
+            fi
 	else
 	    interfaces="$interfaces $i"
 	fi
-- 
2.7.4