healthd.sh: Decrease the resource consumption by replacing the

external commands with the built-in bash commands. Contributed by
vbooh.

CHANGES

@@ -10,6 +10,7 @@ SVN HEAD
   sensors: Add support for temperature min and critical min hysteresis
   fancontrol: Deal with moving hwmon attributes
               Fix shell error when FCFANS is not set
+  healthd: Avoid using external commands
   sensors-detect: Add detection of ADC128D818
                   Add detection of AMD family 16h Kabini and Mullins
                   Add detection of ITE IT8620E and IT8623E

prog/daemon/healthd.sh

@@ -25,7 +25,8 @@ PATH="/bin:/usr/bin:/usr/local/bin:${PATH}"
 
 ADMIN_EMAIL="root@localhost"
 
-if [ -n "`sensors | grep ALARM`" ]
+sensors_state=$(sensors)
+if [[ "$sensors_state" =~ 'ALARM' ]]
 then
         echo "Pending Alarms on start up!  Exiting!"
         exit
@@ -33,10 +34,11 @@ fi
 
 while true
 do
- sleep 15
- if [ -n "`sensors | grep ALARM`" ]
+ read -t 15 -N 0
+ sensors_state=$(sensors)
+ if [[ "$sensors_state" =~ 'ALARM' ]]
  then
-        sensors | mail -s "**** Hardware Health Warning ****"  $ADMIN_EMAIL
-        sleep 600
+        echo "$sensors_state" | mail -s '**** Hardware Health Warning ****' $ADMIN_EMAIL
+        read -t 600 -N 0 
  fi
 done