From d00f04fd5392d9aa6c4e817f579f2f16eb6955c7 Mon Sep 17 00:00:00 2001
From: Dmitrii Metelkin <dmitriim@catalyst-au.net>
Date: Fri, 12 Oct 2018 13:46:03 +1100
Subject: [PATCH] MDL-63623 admin_cli: add a script to uninstall plugins

---
 admin/cli/uninstall_plugins.php | 163 ++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 admin/cli/uninstall_plugins.php

diff --git a/admin/cli/uninstall_plugins.php b/admin/cli/uninstall_plugins.php
new file mode 100644
index 0000000000000..e093d896d5104
--- /dev/null
+++ b/admin/cli/uninstall_plugins.php
@@ -0,0 +1,163 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle 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 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * CLI script to uninstall plugins.
+ *
+ * @package    core
+ * @subpackage cli
+ * @copyright  2018 Dmitrii Metelkin <dmitriim@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+define('CLI_SCRIPT', true);
+
+require(__DIR__ . '/../../config.php');
+require_once($CFG->libdir . '/clilib.php');
+require_once($CFG->libdir . '/adminlib.php');
+
+$help = "Command line tool to uninstall plugins.
+
+Options:
+    -h --help                   Print this help.
+    --show-all                  Displays a list of all installed plugins.
+    --show-missing              Displays a list of plugins missing from disk.
+    --purge-missing             Uninstall all missing from disk plugins.
+    --plugins=<plugin name>     A comma separated list of plugins to be uninstalled. E.g. mod_assign,mod_forum
+    --run                       Execute uninstall. If this option is not set, then the script will be run in a dry mode.
+
+Examples:
+
+    # php uninstall_plugins.php  --show-all
+        Prints tab-separated list of all installed plugins.
+
+    # php uninstall_plugins.php  --show-missing
+        Prints tab-separated list of all missing from disk plugins.
+
+    # php uninstall_plugins.php  --purge-missing
+        A dry run of uninstalling all missing plugins.
+
+    # php uninstall_plugins.php  --purge-missing --run
+        Run uninstall of all missing plugins.
+
+    # php uninstall_plugins.php  --plugins=mod_assign,mod_forum
+        A dry run of uninstalling mod_assign and mod_forum plugins.
+
+    # php uninstall_plugins.php  --plugins=mod_assign,mod_forum --run
+        Run uninstall for mod_assign and mod_forum plugins.
+";
+
+list($options, $unrecognised) = cli_get_params([
+    'help' => false,
+    'show-all' => false,
+    'show-missing' => false,
+    'purge-missing' => false,
+    'plugins' => false,
+    'run' => false,
+], [
+    'h' => 'help'
+]);
+
+if ($unrecognised) {
+    $unrecognised = implode(PHP_EOL.'  ', $unrecognised);
+    cli_error(get_string('cliunknowoption', 'core_admin', $unrecognised));
+}
+
+if ($options['help']) {
+    cli_writeln($help);
+    exit(0);
+}
+
+$pluginman = core_plugin_manager::instance();
+$plugininfo = $pluginman->get_plugins();
+
+if ($options['show-all'] || $options['show-missing']) {
+    foreach ($plugininfo as $type => $plugins) {
+        foreach ($plugins as $name => $plugin) {
+            $pluginstring = $plugin->component . "\t" . $plugin->displayname;
+
+            if ($options['show-all']) {
+                cli_writeln($pluginstring);
+            } else {
+                if ($plugin->get_status() === core_plugin_manager::PLUGIN_STATUS_MISSING) {
+                    cli_writeln($pluginstring);
+                }
+            }
+        }
+    }
+
+    exit(0);
+}
+
+if ($options['purge-missing']) {
+    foreach ($plugininfo as $type => $plugins) {
+        foreach ($plugins as $name => $plugin) {
+            if ($plugin->get_status() === core_plugin_manager::PLUGIN_STATUS_MISSING) {
+
+                $pluginstring = $plugin->component . "\t" . $plugin->displayname;
+
+                if ($pluginman->can_uninstall_plugin($plugin->component)) {
+                    if ($options['run']) {
+                        cli_writeln('Uninstalling: ' . $pluginstring);
+
+                        $progress = new progress_trace_buffer(new text_progress_trace(), true);
+                        $pluginman->uninstall_plugin($plugin->component, $progress);
+                        $progress->finished();
+                        cli_write($progress->get_buffer());
+                    } else {
+                        cli_writeln('Will be uninstalled: ' . $pluginstring);
+                    }
+                } else {
+                    cli_writeln('Can not be uninstalled: ' . $pluginstring);
+                }
+            }
+        }
+    }
+
+    exit(0);
+}
+
+if ($options['plugins']) {
+    $components = explode(',', $options['plugins']);
+    foreach ($components as $component) {
+        $plugin = $pluginman->get_plugin_info($component);
+
+        if (is_null($plugin)) {
+            cli_writeln('Unknown plugin: ' . $component);
+        } else {
+            $pluginstring = $plugin->component . "\t" . $plugin->displayname;
+
+            if ($pluginman->can_uninstall_plugin($plugin->component)) {
+                if ($options['run']) {
+                    cli_writeln('Uninstalling: ' . $pluginstring);
+                    $progress = new progress_trace_buffer(new text_progress_trace(), true);
+                    $pluginman->uninstall_plugin($plugin->component, $progress);
+                    $progress->finished();
+                    cli_write($progress->get_buffer());
+                } else {
+                    cli_writeln('Will be uninstalled: ' . $pluginstring);
+                }
+            } else {
+                cli_writeln('Can not be uninstalled: ' . $pluginstring);
+            }
+        }
+    }
+
+    exit(0);
+}
+
+cli_writeln($help);
+exit(0);