oe-core/init-install.sh: do not overwrite /etc/mtab if the link already exist

Overwriting of /etc/mtab would fail as below if the /etc/mtab link already
exist during installation phase, this patch fix this problem by checking
existance of the link before try to overwrite it.

Error message during installation if the /etc/mtab exists:
"cat: /proc/mounts: input file is output file

(From OE-Core rev: 26a5121e966f465386da4ead40cc558fd877ce2b)

Signed-off-by: Shan Hai <shan.hai@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/meta/recipes-core/initrdscripts/files/init-install.sh b/meta/recipes-core/initrdscripts/files/init-install.sh
index f84a5eb83b..0a1141a6f5 100644
--- a/meta/recipes-core/initrdscripts/files/init-install.sh
+++ b/meta/recipes-core/initrdscripts/files/init-install.sh
@@ -90,7 +90,9 @@ if [ ! -b /dev/loop0 ] ; then
 fi
 
 mkdir -p /tmp
-cat /proc/mounts > /etc/mtab
+if [ ! -L /etc/mtab ]; then
+        cat /proc/mounts > /etc/mtab
+fi
 
 disk_size=$(parted /dev/${device} unit mb print | grep Disk | cut -d" " -f 3 | sed -e "s/MB//")