Handle enabled, but deleted modules properly

refs #2811

application/clicommands/ModuleCommand.php

@@ -78,7 +78,9 @@ class ModuleCommand extends Command
                 "%-14s %-9s %-9s %s\n",
                 $module,
                 $mod->getVersion(),
-                ($type === 'enabled' || $this->modules->hasEnabled($module)) ? 'enabled' : 'disabled',
+                ($type === 'enabled' || $this->modules->hasEnabled($module))
+                    ? $this->modules->hasInstalled($module) ? 'enabled' : 'dangling'
+                    : 'disabled',
                 $dir
             );
         }

application/controllers/ConfigController.php

@@ -102,6 +102,7 @@ class ConfigController extends Controller
         $this->view->modules = Icinga::app()->getModuleManager()->select()
             ->from('modules')
             ->order('enabled', 'desc')
+            ->order('installed', 'asc')
             ->order('name');
         $this->setupLimitControl();
         $this->setupPaginationControl($this->view->modules);
@@ -113,7 +114,7 @@ class ConfigController extends Controller
         $app = Icinga::app();
         $manager = $app->getModuleManager();
         $name = $this->getParam('name');
-        if ($manager->hasInstalled($name)) {
+        if ($manager->hasInstalled($name) || $manager->hasEnabled($name)) {
             $this->view->moduleData = $manager->select()->from('modules')->where('name', $name)->fetchRow();
             if ($manager->hasLoaded($name)) {
                 $module = $manager->getModule($name);

application/views/scripts/config/modules.phtml

@@ -15,7 +15,9 @@
     <?php foreach ($modules as $module): ?>
         <tr>
             <td>
-                <?php if ($module->enabled && $module->loaded) {
+                <?php if (! $module->installed) {
+                    $this->icon('flash', sprintf($this->translate('Module %s is dangling'), $module->name));
+                } elseif ($module->enabled && $module->loaded) {
                     echo $this->icon('thumbs-up', sprintf($this->translate('Module %s is enabled'), $module->name));
                 } elseif (! $module->enabled) {
                     echo $this->icon('block', sprintf($this->translate('Module %s is disabled'), $module->name));

library/Icinga/Application/Modules/Manager.php

@@ -158,17 +158,19 @@ class Manager
                 }
 
                 $dir = realpath($link);
-                if (! file_exists($dir) || !is_dir($dir)) {
+                if ($dir !== false && is_dir($dir)) {
+                    $this->enabledDirs[$file] = $dir;
+                } else {
+                    $this->enabledDirs[$file] = null;
+
                     Logger::warning(
                         'Found invalid module in enabledModule directory "%s": "%s" points to non existing path "%s"',
                         $this->enableDir,
                         $link,
                         $dir
                     );
-                    continue;
                 }
 
-                $this->enabledDirs[$file] = $dir;
                 ksort($this->enabledDirs);
             }
             closedir($dh);
@@ -329,12 +331,6 @@ class Manager
         }
 
         $link = $this->enableDir . DIRECTORY_SEPARATOR . $name;
-        if (! file_exists($link)) {
-            throw new ConfigurationError(
-                'Cannot disable module "%s". Module is not installed.',
-                $name
-            );
-        }
         if (! is_link($link)) {
             throw new ConfigurationError(
                 'Cannot disable module %s at %s. '
@@ -346,7 +342,7 @@ class Manager
             );
         }
 
-        if (file_exists($link) && is_link($link)) {
+        if (is_link($link)) {
             if (! @unlink($link)) {
                 $error = error_get_last();
                 throw new SystemPermissionException(
@@ -471,6 +467,7 @@ class Manager
      * Each entry has the following fields
      * * name, name of the module as a string
      * * path, path where the module is located as a string
+     * * installed, whether the module is installed or not as a boolean
      * * enabled, whether the module is enabled or not as a boolean
      * * loaded, whether the module is loaded or not as a boolean
      *
@@ -480,25 +477,28 @@ class Manager
     {
         $info = array();
 
-        $enabled = $this->listEnabledModules();
-        foreach ($enabled as $name) {
-            $info[$name] = (object) array(
-                'name'    => $name,
-                'path'    => $this->enabledDirs[$name],
-                'enabled' => true,
-                'loaded'  => $this->hasLoaded($name)
-            );
-        }
-
         $installed = $this->listInstalledModules();
         foreach ($installed as $name) {
             $info[$name] = (object) array(
                 'name'      => $name,
                 'path'      => $this->installedBaseDirs[$name],
+                'installed' => true,
                 'enabled'   => $this->hasEnabled($name),
                 'loaded'    => $this->hasLoaded($name)
             );
         }
+
+        $enabled = $this->listEnabledModules();
+        foreach ($enabled as $name) {
+            $info[$name] = (object) array(
+                'name'      => $name,
+                'path'      => $this->enabledDirs[$name],
+                'installed' => $this->enabledDirs[$name] !== null,
+                'enabled'   => true,
+                'loaded'    => $this->hasLoaded($name)
+            );
+        }
+
         return $info;
     }