X-Git-Url: https://git.adam-barratt.org.uk/?a=blobdiff_plain;f=dsa-nagios-nrpe-config%2Fdsa-update-apt-status;h=d4a6f2d80ef65613558dc2264685af573276b293;hb=ad0fc3b3525fe816a7409a75e4cae618f093cb0d;hp=47c7e7ad723bb72c15b2a7d9e30871102ee67ac2;hpb=e49f10c8c838e9d2cc817515b155c5ca4e127eb7;p=mirror%2Fdsa-nagios.git

diff --git a/dsa-nagios-nrpe-config/dsa-update-apt-status b/dsa-nagios-nrpe-config/dsa-update-apt-status
index 47c7e7a..d4a6f2d 100755
--- a/dsa-nagios-nrpe-config/dsa-update-apt-status
+++ b/dsa-nagios-nrpe-config/dsa-update-apt-status
@@ -2,10 +2,39 @@
 
 UPDATE_RUNS=3
 STATUS=/var/cache/dsa/nagios/apt
+SLEEP_MAX=$(( 15 * 60 ))
+MAX_AGE=$(( 23 * 60 * 60 ))
+
+# we want to run if any of the following things is true
+#  - we have never run before
+#  - var/lib/dpkg/status has been touched since the last run
+#  - var/cache/apt/pkgcache.bin has been touched since the last run
+#  - our last run ended with 'apt-get update failed'
+#  - our last run has been more than MAX_AGE (23hrs) ago
+run_required() {
+	local run=0
+	local norun=1
+
+	[ -e "$STATUS" ] || return $run
+	[ /var/lib/dpkg/status -nt "$STATUS" ] && return $run
+	[ /var/cache/apt/pkgcache.bin -nt "$STATUS" ] && return $run
+	grep "apt-get update failed" "$STATUS" > /dev/null && return $run
+
+	local last_mod
+	last_mod=`stat -c "%Y" "$STATUS"`
+	now=`date +%s`
+	age=$(( $now - $last_mod ))
+	[ "$age" -gt "$MAX_AGE" ] && return $run
+
+	return $norun
+}
+
+# do stuff only when required
+run_required || exit
 
 # sleep if called non-interactively
 if [ -z "$TERM" -o "$TERM" = "dumb" ]; then
-	sleep $(( $RANDOM % 7200 ))
+	sleep $(( $RANDOM % $SLEEP_MAX ))
 fi
 
 # run apt-get update, retry a few times if it fails