[kexec-tools/f19] monitor-dd-progress fix

[Baoquan He]

commit 306d841252a88bcf4bae3448a835f0b196d164d8
Author: Dave Young <dyoung at redhat.com>
Date:   Tue Jun 25 16:15:45 2013 +0800

    monitor-dd-progress fix
    
    stdout if line buffered, thus even it's redirect to stderr, it will not show
    on console automaticly. Because monitor_dd_progress is only for rawdump
    currently, so I think we can just use "echo" instead of "echo -n".
    
    Another problem is sometimes CURRENT_SIZE does not get value when it's used
    in $(($CURRENT_SIZE / 1048576)), fix this issue as well.
    
    Signed-off-by: Dave Young <dyoung at redhat.com>
    Acked-by: WANG Chao <chaowang at redhat.com>

 dracut-monitor_dd_progress |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/dracut-monitor_dd_progress b/dracut-monitor_dd_progress
index 01a1567..e139d33 100644
--- a/dracut-monitor_dd_progress
+++ b/dracut-monitor_dd_progress
@@ -19,8 +19,10 @@ do
 
     kill -s USR1 $DD_PID
     CURRENT_SIZE=`tail -n 1 /tmp/dd_progress_file | sed "s/[^0-9].*//g"`
-    CURRENT_MB=$(($CURRENT_SIZE / 1048576))
-    echo -n -e "Copied $CURRENT_MB MB / $SRC_FILE_MB MB\r"
+    [ -n "$CURRENT_SIZE" ] && {
+        CURRENT_MB=$(($CURRENT_SIZE / 1048576))
+        echo -e "Copied $CURRENT_MB MB / $SRC_FILE_MB MB\r"
+    }
 done
 
 rm -f /tmp/dd_progress_file