swap: return "U" in case of missing swap

The swap plugin should return "U" if no value was found. Source: patch "310-fix-swap-output" from Opennet Firmware
munin-monitoring · Jul 19, 2019 · ab2347f · ab2347f
1 parent eb5f13e
commit ab2347f
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/plugins/swap b/plugins/swap
@@ -17,8 +17,8 @@ config_swap() {
 fetch_swap() {
   if [ -f /proc/vmstat ]; then
     SINFO=$(cat /proc/vmstat)
-    echo "swap_in.value" $(echo "$SINFO" | grep "^pswpin" | cut -d\  -f2)
-    echo "swap_out.value" $(echo "$SINFO" | grep "^pswpout" | cut -d\  -f2)
+    echo "swap_in.value" $(echo "$INFO" | awk 'BEGIN { result="U"; } { if ($1 == "pswpin") result=$2; } END { print(result); }')
+    echo "swap_out.value" $(echo "$INFO" | awk 'BEGIN { result="U"; } { if ($1 == "pswpout") result=$2; } END { print(result); }')
   else
     SINFO=$(grep "^swap" /proc/stat)
     echo "swap_in.value" $(echo "$SINFO" | cut -d\  -f2)