dracut-kdump.sh: Use stat instead of ls to get vmcore size

ls output is fragile, so use stat instead.

Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Philipp Rudo <prudo@redhat.com>

dracut-kdump.sh

@@ -366,7 +366,7 @@ dump_raw()
     dinfo "saving to raw disk $_raw"
 
     if ! $(echo -n $CORE_COLLECTOR|grep -q makedumpfile); then
-        _src_size=`ls -l /proc/vmcore | cut -d' ' -f5`
+        _src_size=$(stat --format %s /proc/vmcore)
         _src_size_mb=$(($_src_size / 1048576))
         /kdumpscripts/monitor_dd_progress $_src_size_mb &
     fi

dracut-module-setup.sh

@@ -1029,6 +1029,7 @@ install() {
     inst "/bin/head" "/bin/head"
     inst "/bin/awk" "/bin/awk"
     inst "/bin/sed" "/bin/sed"
+    inst "/bin/stat" "/bin/stat"
     inst "/sbin/makedumpfile" "/sbin/makedumpfile"
     inst "/sbin/vmcore-dmesg" "/sbin/vmcore-dmesg"
     inst "/usr/bin/printf" "/sbin/printf"