From 161784155bf1ef9b435a4b4baa22deff87e53025 Mon Sep 17 00:00:00 2001
From: Michael Howe <michael@michaelhowe.org>
Date: Sat, 23 Dec 2023 14:03:16 +0000
Subject: [PATCH] New plugin to check that newaliases has run on /etc/aliases

---
 debian/changelog                           |  6 ++++
 debian/nagios-plugins-local-client.install |  1 +
 plugins/check_newaliases                   | 35 ++++++++++++++++++++++
 3 files changed, 42 insertions(+)
 create mode 100755 plugins/check_newaliases

diff --git a/debian/changelog b/debian/changelog
index 36a71c9..9c2dcae 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+nagios-plugins-local (0.27) unstable; urgency=medium
+
+  * Add check_newaliases 
+
+ -- Michael Howe <michael@michaelhowe.org>  Sat, 23 Dec 2023 14:02:10 +0000
+
 nagios-plugins-local (0.26) unstable; urgency=medium
 
   * Remove check_running_kernel and associated overrides as the upstream
diff --git a/debian/nagios-plugins-local-client.install b/debian/nagios-plugins-local-client.install
index f845d36..ad375c1 100644
--- a/debian/nagios-plugins-local-client.install
+++ b/debian/nagios-plugins-local-client.install
@@ -2,5 +2,6 @@
 /usr/lib/nagios/plugins/check_configtool
 /usr/lib/nagios/plugins/check_md_raid
 /usr/lib/nagios/plugins/check_monit
+/usr/lib/nagios/plugins/check_newaliases
 /usr/lib/nagios/plugins/check_iostat
 /usr/lib/nagios/plugins/check_systemd
diff --git a/plugins/check_newaliases b/plugins/check_newaliases
new file mode 100755
index 0000000..c8396f2
--- /dev/null
+++ b/plugins/check_newaliases
@@ -0,0 +1,35 @@
+#!/bin/bash
+#
+# Simple script to check that /etc/aliases.db is newer than /etc/aliases for
+# systems that require the db file to exist.
+#
+# Possibly a slight race condition if you deploy /etc/aliases and run
+# newaliases within the same second, but this is highly unlikely.
+
+set -e
+set -u
+
+NEWALIASES=/usr/bin/newaliases
+REQUIRED_TARGET=/usr/sbin/sendmail
+
+ALIAS_FILE=/etc/aliases
+ALIASDB_FILE=${ALIAS_FILE}.db
+
+TARGET=$(readlink -f $NEWALIASES)
+
+if [ "$TARGET" != "$REQUIRED_TARGET" ]; then
+    echo "ALIASES OK - Looks like we're not running postfix (newaliases points to ${TARGET})"
+    exit
+fi
+
+ALIAS_TS=$(stat --format %Y $ALIAS_FILE)
+ALIASDB_TS=$(stat --format %Y $ALIASDB_FILE)
+
+sec=$((ALIASDB_TS - ALIAS_TS))
+
+if [ $sec > 0 ]; then
+    echo "ALIASES OK - aliases.db is ${sec}s newer than aliases"
+else
+    echo "ALIASES CRITICAL - aliases.db is ${sec}s older than aliases"
+    exit 2
+fi
-- 
2.39.5