qemuimagetest: add basic function to check enough disk space

one test case to check disk space availability.

(From OE-Core rev: d7b549a72a91db41d8b7084b4b3efa162a62a880)

Signed-off-by: veerabrahmam <veerabrahmamvr@huawei.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/qemuimage-tests/tools/df.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+# df test script to check enough disk space for qemu target
+#
+# Author: veera <veerabrahmamvr@huawei.com>
+#
+# This file is licensed under the GNU General Public License,
+# Version 2.
+#taking the size of the each partition
+array_list=(`df -P | tr -s " " | cut -d " " -f4`)
+#Total size of the array
+array_size=`echo ${#array_list[@]}`
+loop_val=1
+#while loop to check the size of partitions are less than 5MB
+while [ $loop_val -lt  $array_size ]
+do 
+ #taking each value from the array to check the size 
+ value=`echo ${array_list[$loop_val]}`
+ if [[ $value -gt 5120 ]];then
+  loop_val=`expr $loop_val + 1`
+ else
+  echo "QEMU: df : disk space is not enough"
+  exit 1
+ fi 
+done
+exit 0