fix(import): [develop] log each template error correctly

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## ChangeLog
 
 --- develop ---
+* issue: Log each template import error using its own message (#757)
 * bug: Element-qualify the `.thold-pill` CSS so it outranks the single-class theme rules (e.g. `.deviceUpFull` `width:14%`) that were clipping the pill to a fixed width; status pills now size to their label on the Device Status page and everywhere else
 * feature: Clicking an already-selected status pill now clears that filter (resets to All) instead of re-applying it, on the Thresholds, Device Status and Threshold Log sub-tabs
 * bug: Pass a boolean (not the integer `1`) to `api_plugin_register_hook()`'s `$enable` argument so the hook registration stays type-correct under Cacti 1.3's strict `bool $enable` type-hint (the int only coerces while this file lacks `declare(strict_types=1)`)

tests/Unit/TemplateImportErrorLoggingTest.php

@@ -0,0 +1,35 @@
+<?php
+/*
+ +-------------------------------------------------------------------------+
+ | Copyright (C) 2004-2026 The Cacti Group                                 |
+ |                                                                         |
+ | This program is free software; you can redistribute it and/or           |
+ | modify it under the terms of the GNU General Public License             |
+ | as published by the Free Software Foundation; either version 2          |
+ | of the License, or (at your option) any later version.                  |
+ +-------------------------------------------------------------------------+
+ | Cacti: The Complete RRDtool-based Graphing Solution                     |
+ +-------------------------------------------------------------------------+
+ | http://www.cacti.net/                                                   |
+ +-------------------------------------------------------------------------+
+*/
+
+/** Regression for template error logs reusing a previous success message. */
+final class TemplateImportErrorLoggingTest extends TestCase {
+	public function testEachImportErrorUsesItsOwnMessage(): void {
+		$source = file_get_contents(dirname(__DIR__, 2) . '/thold_templates.php');
+		preg_match('/foreach \(\$return_data\[\'errors\'\] as \$error\) \{(.*?)\n\t\t\}/s', $source, $loop);
+		$this->assertNotEmpty($loop);
+		$return_data = ['errors' => ['missing field', 'invalid template']];
+		$message = 'previous success';
+		$debug_data = [];
+		// Run the production loop body using the existing logging recorder.
+		foreach ($return_data['errors'] as $error) {
+			eval($loop[1]);
+		}
+		$this->assertSame([
+			'NOTE: Template Import Error!.  Message: missing field',
+			'NOTE: Template Import Error!.  Message: invalid template',
+		], CactiStubs::$log);
+	}
+}

thold_templates.php

@@ -2718,7 +2718,7 @@ function template_import() {
 	if (isset($return_data['errors'])) {
 		foreach ($return_data['errors'] as $error) {
 			$debug_data[] = '<span class="deviceDown">' . __('ERROR:', 'thold') . '</span> ' . $error;
-			cacti_log('NOTE: Template Import Error!.  Message: ' . $message, false, 'THOLD');
+			cacti_log('NOTE: Template Import Error!.  Message: ' . $error, false, 'THOLD');
 		}
 	}