Adds a check that errors on store start if MariaDB is detected (matte…

…rmost-community#3725)

* Adds a check that errors on store start if MariaDB is detected

* Fix linter

* Update error message

Co-authored-by: Mattermod <[email protected]>

server/services/store/sqlstore/sqlstore.go

@@ -2,8 +2,10 @@ package sqlstore
 
 import (
 	"database/sql"
+	"errors"
 	"fmt"
 	"net/url"
+	"strings"
 
 	sq "github.com/Masterminds/squirrel"
 
@@ -15,6 +17,9 @@ import (
 	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
+//nolint:lll
+var ErrInvalidMariaDB = errors.New("MariaDB database is not supported, you can find more information at https://docs.mattermost.com/install/software-hardware-requirements.html#database-software")
+
 // SQLStore is a SQL database.
 type SQLStore struct {
 	db               *sql.DB
@@ -53,6 +58,10 @@ func New(params Params) (*SQLStore, error) {
 		servicesAPI:      params.ServicesAPI,
 	}
 
+	if store.IsMariaDB() {
+		return nil, ErrInvalidMariaDB
+	}
+
 	var err error
 	store.isBinaryParam, err = store.computeBinaryParam()
 	if err != nil {
@@ -70,6 +79,22 @@ func New(params Params) (*SQLStore, error) {
 	return store, nil
 }
 
+func (s *SQLStore) IsMariaDB() bool {
+	if s.dbType != model.MysqlDBType {
+		return false
+	}
+
+	row := s.db.QueryRow("SELECT Version()")
+
+	var version string
+	if err := row.Scan(&version); err != nil {
+		s.logger.Error("error checking database version", mlog.Err(err))
+		return false
+	}
+
+	return strings.Contains(strings.ToLower(version), "mariadb")
+}
+
 // computeBinaryParam returns whether the data source uses binary_parameters
 // when using Postgres.
 func (s *SQLStore) computeBinaryParam() (bool, error) {