X-Git-Url: https://git.adam-barratt.org.uk/?a=blobdiff_plain;f=dsa-nagios-nrpe-config%2Fdsa-update-apt-status;h=a6b5b8ada8b92fde1b2e7334bb71cdc61e9eb539;hb=6f1b9549915d9d7837e09a3a53054237801b573d;hp=685f96608a48d1867eb0661de5b774017962d533;hpb=75a4ebd70cfca375473da0ac1fd0c2259dbd76a7;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 685f966..a6b5b8a 100755
--- a/dsa-nagios-nrpe-config/dsa-update-apt-status
+++ b/dsa-nagios-nrpe-config/dsa-update-apt-status
@@ -2,10 +2,42 @@
 
 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 % $SLEEP_MAX ))
 fi
+
+# run apt-get update, retry a few times if it fails
 count=0
 while [ "$count" -lt "$UPDATE_RUNS" ]; do
 	apt-get update -qq
@@ -19,6 +51,7 @@ if [ "$count" -ge "$UPDATE_RUNS" ]; then
 	 exit 1
 fi
 
+# run the apt check itself
 tmp=`tempfile`
 trap "rm -f '$tmp'" exit
 /usr/share/dsa/apt-status-check --noupdate --timeout=600 > "$tmp"