From 655a2d7346551b036b9fd09bef1afa6a331e6958 Mon Sep 17 00:00:00 2001
From: pbailie <pbailie@users.noreply.github.com>
Date: Tue, 21 Aug 2018 17:04:22 -0400
Subject: [PATCH] map_course.php

Sysadmin script to map a course in master DB
---
 sample_bin/map_course.php | 86 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100755 sample_bin/map_course.php

diff --git a/sample_bin/map_course.php b/sample_bin/map_course.php
new file mode 100755
index 0000000..3865748
--- /dev/null
+++ b/sample_bin/map_course.php
@@ -0,0 +1,86 @@
+#!/usr/bin/env php
+<?php
+
+/**
+ * Sysadmin tool to map a course to appear as a section of another
+ *
+ * Should a Submitty course have multiple entries, possibly for cross
+ * registration or undergrad/grad versions, this tool will make a DB entry
+ * to map one course to another.  The course being mapped will appear in the
+ * course it was mapped to as another section.
+ *
+ * @author Peter Bailie (systems programmer, RPI dept. of computer science)
+ */
+
+error_reporting(E_ERROR);
+ini_set('display_errors', 'stderr');
+define ('DB_CONFIG_PATH', '/usr/local/submitty/config/database.json');
+
+//This script should be run as root.
+if (posix_getuid() !== 0) {
+	exit(sprintf("This script must be run as root.%s", PHP_EOL));
+}
+
+//This script cannot be run as a webpage.
+if (PHP_SAPI !== 'cli') {
+	exit(sprintf("This script must be run from the command line.%s", PHP_EOL));
+}
+
+//Print usage if there are not five CLI arguments
+if ($argc !== 6) {
+	exit(sprintf("Usage:  %s  semester_code  course  section  mapped_course  mapped_section%s", $argv[0], PHP_EOL));
+}
+
+//Get DB connection config from Submitty
+$json_str = file_get_contents(DB_CONFIG_PATH);
+$db_config = json_decode($json_str, true);
+
+//Connect to master DB.
+$db_conn = pg_connect("dbname=submitty host={$db_config['database_host']} user={$db_config['database_user']} password={$db_config['database_password']}");
+if (pg_connection_status($db_conn) !== PGSQL_CONNECTION_OK) {
+	exit(sprintf("ERROR: Could not establish connection to Submitty Master DB%sCheck configuration at %s%s", PHP_EOL, DB_CONFIG_PATH, PHP_EOL));
+}
+
+//Register pg_close() to occur on shutdown in case script quits on error.
+register_shutdown_function(function() use ($db_conn) {
+	pg_close($db_conn);
+});
+
+//$argv[1]: semester_code
+//$argv[2]: course
+//$argv[3]: section
+//$argv[4]: mapped_course
+//$argc[5]: mapped_section
+list($semester, $course, $section, $mapped_course, $mapped_section) = array_slice($argv, 1, 5);
+
+//INSERT new (mapped) registration section
+$query = <<<SQL
+INSERT INTO courses_registration_sections
+	VALUES ($1, $2, $3)
+ON CONFLICT ON CONSTRAINT courses_registration_sections_pkey
+	DO NOTHING
+SQL;
+
+$res = pg_query_params($db_conn, $query, array($semester, $mapped_course, $mapped_section));
+if ($res === false) {
+	exit(sprintf("DB error when INSERTing registration section %s%s%s%s", $mapped_section, PHP_EOL, pg_last_error($db_conn), PHP_EOL));
+}
+
+//INSERT new mapped course
+$query = <<<SQL
+INSERT INTO mapped_courses
+	VALUES ($1, $2, $3, $4, $5)
+ON CONFLICT ON CONSTRAINT mapped_courses_pkey
+	DO UPDATE SET mapped_course=EXCLUDED.mapped_course, mapped_section=EXCLUDED.mapped_section
+SQL;
+
+$res = pg_query_params($db_conn, $query, array($semester, $course, $section, $mapped_course, $mapped_section));
+if ($res === false) {
+	exit(sprintf("DB error when INSERTing mapped course %s%s%s%s", $mapped_course, PHP_EOL, pg_last_error($db_conn), PHP_EOL));
+}
+
+//Complete
+printf("Mapped %s section %s to %s section %s.%s", $course, $section, $mapped_course, $mapped_section, PHP_EOL);
+exit(0);
+
+?>