From 483506b1898464366a30411a1f8ed336b508f870 Mon Sep 17 00:00:00 2001
From: Christian Hesse <mail@eworm.de>
Date: Fri, 9 Jul 2021 22:05:45 +0200
Subject: global-functions: introduce $ScriptRunOnce

---
 global-config         |  6 +++++-
 global-config-overlay |  2 +-
 global-config.changes |  1 +
 global-functions      | 43 ++++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/global-config b/global-config
index b4f4a28..98c65d9 100644
--- a/global-config
+++ b/global-config
@@ -8,7 +8,7 @@
 
 # Make sure all configuration properties are up to date and this
 # value is in sync with value in script 'global-functions'!
-:global GlobalConfigVersion 61;
+:global GlobalConfigVersion 62;
 
 # This is used for DNS and backup file.
 :global Domain "example.com";
@@ -167,6 +167,10 @@
 # use next branch with default url (git.eworm.de)
 #:global ScriptUpdatesUrlSuffix "\?h=next";
 
+# Use this for defaults with $ScriptRunOnce
+:global ScriptRunOnceBaseUrl "";
+:global ScriptRunOnceUrlSuffix "";
+
 # This project is developed in private spare time and usage is free of charge
 # for you. If you like the scripts and think this is of value for you or your
 # business please consider a donation:
diff --git a/global-config-overlay b/global-config-overlay
index f8d2cee..f4ea04d 100644
--- a/global-config-overlay
+++ b/global-config-overlay
@@ -8,7 +8,7 @@
 # Make sure all configuration properties are up to date and this
 # value is in sync with value in script 'global-functions'!
 # Comment or remove to disable news and change notifications.
-:global GlobalConfigVersion 61;
+:global GlobalConfigVersion 62;
 
 # Copy configuration from global-config here and modify it.
 
diff --git a/global-config.changes b/global-config.changes
index 4fd107b..23a1dac 100644
--- a/global-config.changes
+++ b/global-config.changes
@@ -65,6 +65,7 @@
   59="Updating CAP with 'check-routeros-update' is now possible with opt-in.";
   60="Implemented a pre-down hook in 'netwatch-notify' that fires at two thirds of failed checks.";
   61="Finally removed old scripts.";
+  62="Added '\$ScriptRunOnce' to run a script from URL once without installation, intended to aid configuration management and the like.";
 };
 
 # Migration steps to be applied on script updates
diff --git a/global-functions b/global-functions
index 47d70f1..1c20636 100644
--- a/global-functions
+++ b/global-functions
@@ -8,7 +8,7 @@
 # https://git.eworm.de/cgit/routeros-scripts/about/
 
 # expected configuration version
-:global ExpectedConfigVersion 61;
+:global ExpectedConfigVersion 62;
 
 # global variables not to be changed by user
 :global GlobalFunctionsReady false;
@@ -44,6 +44,7 @@
 :global ScriptFromTerminal;
 :global ScriptInstallUpdate;
 :global ScriptLock;
+:global ScriptRunOnce;
 :global SendEMail;
 :global SendEMail2;
 :global SendNotification;
@@ -991,6 +992,46 @@
   :return true;
 }
 
+# fetch and run script(s) once
+:set ScriptRunOnce do={
+  :local Scripts [ :toarray $1 ];
+
+  :global ScriptRunOnceBaseUrl;
+  :global ScriptRunOnceUrlSuffix;
+
+  :global LogPrintExit2;
+  :global ValidateSyntax;
+
+  :foreach Script in=$Scripts do={
+    :if (!($Script ~ "^(ftp|https\?|sftp)://")) do={
+      :if ([ :len $ScriptRunOnceBaseUrl ] = 0) do={
+        $LogPrintExit2 warning $0 ("Script '" . $Script . "' is not an url and base url is not available.") true;
+      }
+      :set Script ($ScriptRunOnceBaseUrl . $Script . $ScriptRunOnceUrlSuffix);
+    }
+
+    :local Source;
+    :do {    
+      :set Source ([ / tool fetch check-certificate=yes-without-crl $Script output=user as-value ]->"data");
+    } on-error={
+      $LogPrintExit2 warning $0 ("Failed fetching script '" . $Script . "'!") false;
+    }
+
+    :if ([ :len $Source ] > 0) do={
+      :if ([ $ValidateSyntax $Source ] = true) do={
+        :do {
+          $LogPrintExit2 info $0 ("Running script '" . $Script . "' now.") false;
+          [ :parse $Source ];
+        } on-error={
+          $LogPrintExit2 warning $0 ("The script '" . $Script . "' failed to run!") false;
+        }
+      } else={
+        $LogPrintExit2 warning $0 ("The script '" . $Script . "' failed syntax validation!") false;
+      }
+    }
+  }
+}
+
 # send notification via e-mail - expects at lease two string arguments
 :set SendEMail do={
   :global SendEMail2;
-- 
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