From c89b75778b1261cf86e8f9266944528444b439f6 Mon Sep 17 00:00:00 2001
From: Stephen Soltesz <soltesz@cs.princeton.edu>
Date: Thu, 7 Oct 2010 18:24:24 +0000
Subject: [PATCH] prevent lost data in case upload fails

---
 histlog/collect_log_sh | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/histlog/collect_log_sh b/histlog/collect_log_sh
index b8d535e..91dd0fb 100644
--- a/histlog/collect_log_sh
+++ b/histlog/collect_log_sh
@@ -6,15 +6,23 @@ function upload_log ()
     old=/tmp/$( basename $file ).old
     new=/tmp/$( basename $file ).new
     log=/tmp/$( basename $file ).log
-    touch $old
+    if [ -f $new ] ; then
+        cp $new $old
+    else
+        touch $old
+    fi
     cp $file $new
     comm -1 -3 $old $new > $log
-    cp $new $old
-    if [ $( stat -c %s $log ) -ne 0 ] ; then 
+    if [ $( stat -c %s $log ) -ne 0 ] ; then
         curl --insecure https://monitor.planet-lab.org/monitor/uploadlogs --form "dir=$path" --form "log=@$log"
+        if [ $? -ne 0 ] ; then
+            # the upload has failed, so remove new file so no data is lost
+            rm -f /tmp/$( basename $file ).new
+        fi
     fi
 }
 
+
 upload_log ~/.bash_eternal_history hist
 #upload_log /var/log/secure hist
 
-- 
2.43.0