Added diskwatch script.

files/check_disk_usage.sh

+#!/bin/bash
+
+WARNINGS=$(df -l --output=source,fstype,pcent,target | tail --lines=+2 | while read source fstype usage mountpoint
+do
+    # Only filesystems that originate from some kind of device
+    if [[ "$source" != /* ]]
+    then
+	continue
+    fi
+
+    # Remove trailing percentage sign.
+    usage=${usage%%%}
+
+    # Warn if usage is above 90%
+    if [[ ${usage} -gt 89 ]]
+    then
+	echo "${source} (mounted on ${mountpoint}) is ${usage}% full"
+    fi
+done)
+
+if [[ "$WARNINGS" != "" ]]
+then
+    echo "WARNINGS"
+
+    (
+	echo -n "From: noreply@"
+	cat /etc/hostname
+	for r in $WARNING_RECIPIENTS
+	do
+	    echo "To: ${r}"
+	done
+	echo "Subject: Disk usage warning"
+	echo
+	echo "The following disks are almost full:"
+	echo "$WARNINGS"
+    ) | sendmail -t
+fi

manifests/diskwatch.pp

+# Watch for low disk space
+class aes::diskwatch {
+  # Who should receive warnings? (space separated)
+  $recipients = 'filip.stromback@liu.se klas.arvidsson@liu.se'
+
+  # Directory for the scripts.
+  file { '/opt/upp' :
+    ensure => directory,
+    owner  => root,
+    group  => root,
+    mode   => '0755',
+  }
+
+  # The script itself.
+  file { '/opt/upp/check_disk_usage.sh' :
+    ensure => file,
+    owner  => root,
+    group  => root,
+    mode   => '0744',
+    source => "puppet:///modules/${module_name}/check_disk_usage.sh",
+  }
+
+  # We need a service.
+  systemd::manage_unit { 'diskwatch.service' :
+    unit_entry    => {
+      'Description' => 'Watch for high disk usage',
+    },
+    service_entry => {
+      'Type'        => 'oneshot',
+      'ExecStart'   => '/opt/upp/check_disk_usage.sh',
+      'Environment' => "\"WARNING_RECIPIENTS=${recipients}\"",
+    },
+  }
+
+  # And a timer.
+  systemd::manage_unit { 'diskwatch.timer' :
+    unit_entry    => {
+      'Description' => 'Check disk usage daily',
+    },
+    timer_entry   => {
+      'OnCalendar' => '*-*-* 07:00:00',
+    },
+    install_entry => {
+      'WantedBy' => 'timers.target',
+    },
+    enable        => true,
+    active        => true,
+  }
+}

manifests/init.pp

@@ -14,6 +14,7 @@ class aes {
   include aes::broker
   include aes::auth
   include aes::auth_keydb
+  include aes::diskwatch
 
   case fact('os.name') {
     'RedHat': {