Add migration script for missing users DEFAULTs

This commit adds a migration script to add missing DEFAULT values on the
users table. INSERTs into the users table fail without these DEFAULTs on
MariaDB in strict mode.

scripts/db_migrations/version7.sh

@@ -0,0 +1,74 @@
+#!/bin/sh
+# CAcert WebDB - CAcert web application
+# Copyright (C) 2023  CAcert Inc.
+#
+# 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; version 2 of the License.
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+
+
+# script to do database migrations
+
+set -e # script fails if any command fails
+
+STDIN=0
+STDOUT=1
+STDERR=2
+
+if [ "$1" = "--help" ]; then
+	cat >&$STDERR <<- USAGE
+		Usage: $0 [MARIADB_OPTIONS]
+		You have to specify all options needed by "mariadb" as if you had started
+		the MariaDB command line client directly (including the name of the
+		database to operate on). The MariaDB user used has to have enough
+		privileges to do all necessary operations (among others CREATE, ALTER,
+		DROP, UPDATE, INSERT, DELETE).
+		You might need to enter the mariadb password multiple times if you
+		specify the -p option.
+	USAGE
+	exit 1
+fi
+
+mariadb_opt=" --batch --skip-column-names $@"
+
+schema_version=$(mariadb $mariadb_opt <<- 'SQL'
+
+	SELECT MAX(`version`) FROM `schema_version`;
+SQL
+)
+if [ $schema_version != 6 ]; then
+	cat >&$STDERR <<- ERROR
+		Error: database schema is not in the right version to do the migration!
+		Expected version: 6
+	ERROR
+	exit 2
+fi
+
+mariadb $mariadb_opt <<- 'SQL'
+ALTER TABLE `users` ALTER `orgadmin` SET DEFAULT 0;
+ALTER TABLE `users` ALTER `adadmin` SET DEFAULT 0;
+ALTER TABLE `users` ALTER `locked` SET DEFAULT 0;
+ALTER TABLE `users` ALTER `otphash` SET DEFAULT '';
+ALTER TABLE `users` ALTER `otppin` SET DEFAULT 0;
+system echo "added missing default values on users table"
+
+	-- Update schema version number
+	INSERT INTO `schema_version`
+		(`version`, `when`) VALUES
+		(7, CURRENT_TIMESTAMP);
+SQL
+
+
+echo "Database successfully migrated to version 7"
+exit 0
+