From 6e03a3b93514c435ee6e5de91c1fda0c1a318c1c Mon Sep 17 00:00:00 2001
From: Christian Hesse <mail@eworm.de>
Date: Thu, 3 Jan 2019 15:36:26 +0100
Subject: [PATCH] script-updates: add configuration versioning

---
 global-config    |  4 ++++
 global-functions |  3 +++
 script-updates   | 13 +++++++++++++
 3 files changed, 20 insertions(+)

diff --git a/global-config b/global-config
index 6e32e7f..b77336c 100644
--- a/global-config
+++ b/global-config
@@ -4,6 +4,10 @@
 #
 # global configuration
 
+# Make sure all configuration properties are up to date and this
+# value is in sync with value in script 'global-functions'!
+:global GlobalConfigVersion 0;
+
 # This is used for DNS and backup file.
 :global "domain" "example.com";
 :global "hostname-in-zone" true;
diff --git a/global-functions b/global-functions
index 909e381..2c559ae 100644
--- a/global-functions
+++ b/global-functions
@@ -4,6 +4,9 @@
 #
 # global functions
 
+# expected configuration version
+:global ExpectedConfigVersion 0;
+
 # read input from user
 :global Read do={
   :return;
diff --git a/script-updates b/script-updates
index 9dae710..5ed0f5b 100644
--- a/script-updates
+++ b/script-updates
@@ -4,11 +4,16 @@
 #
 # update installed scripts from file or url
 
+:global GlobalConfigVersion;
+:global ExpectedConfigVersion;
+:global "identity";
 :global "script-updates-fetch";
 :global "script-updates-baseurl";
 :global "script-updates-urlsuffix";
 :global "script-updates-ignore";
 
+:global SendNotification;
+
 :foreach script in=[ / system script find ] do={
   :local ignore 0;
   :local scriptname [ / system script get $script name ];
@@ -71,3 +76,11 @@
     :log debug ("No update for script " . $scriptname);
   }
 }
+
+:if ($GlobalConfigVersion < $ExpectedConfigVersion) do={
+  $SendNotification "Configuration warning!" \
+      ("Current configuration on " . $identity . " is out of date. " . \
+      "Please update global-config, then increase variable " . \
+      "GlobalConfigVersion (currently " . $GlobalConfigVersion . \
+      ") to " . $ExpectedConfigVersion . " and re-run global-config.");
+}