[OE-core] [PATCH] busybox:udhcpc: fix the root_is_nfs() function

[rongqing.li at windriver.com]

From: Roy.Li <rongqing.li at windriver.com>

[YOCTO #2788]

The system will be hung when udhcpc starts, if nfs is mounted
at "/" directory and default route is different after starting
udhcpc.

The cause is that root_is_nfs() does not work after kernel-2.6.37,
since the device name has been changed from /dev/root to
${IPADDR}:${NFSDIR} on /proc/mounts. which leads to remove
the default routes to nfs server,

Now we use a loose match to check if rootfs is nfs.

Signed-off-by: Roy.Li <rongqing.li at windriver.com>
---
 meta/recipes-core/busybox/files/simple.script |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/meta/recipes-core/busybox/files/simple.script b/meta/recipes-core/busybox/files/simple.script
index 27368f0..dc2121d 100644
--- a/meta/recipes-core/busybox/files/simple.script
+++ b/meta/recipes-core/busybox/files/simple.script
@@ -10,7 +10,8 @@ RESOLV_CONF="/etc/resolv.conf"
 
 # return 0 if root is mounted on a network filesystem
 root_is_nfs() {
-	grep -qe '^/dev/root.*\(nfs\|smbfs\|ncp\|coda\) .*' /proc/mounts
+	sed -n 's/^[^ ]* \([^ ]*\) \([^ ]*\) .*$/\1 \2/p' /proc/mounts |
+	grep -q "^/ \(nfs\|smbfs\|ncp\|coda\)$"
 }
 
 have_bin_ip=0
-- 
1.7.4.1