sync_databases_between_mysql_installations.sh: fix error in case of all database sync.

sync_databases_between_mysql_installations.sh

@@ -25,20 +25,7 @@ mkdir -p ${log_dir}
 # -          ...
 # -       "
 # -
-sync_mysql_databases="
-   akb_br
-   b_asyl_barnim
-   brandenburg33
-   demos_g_nazis
-   gallery_akb
-   kurage
-   neuruppin
-   phpmyadmin
-   rundertisch
-   soli_asyl_potsdam
-   willkommen_ohv
-   zossen
-"
+sync_mysql_databases=""
 
 # - mysql_source_credential_args
 # - mysql_target_credential_args
@@ -134,6 +121,13 @@ echo_skipped() {
    echo -e "\033[80G[ \033[33m\033[1mskipped\033[m ]"
 }
 
+trim() {
+    local var="$*"
+    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
 service_exists() {
     local n=$1
     if [[ $(systemctl list-units --all -t service --full --no-legend "$n.service" | cut -f1 -d' ') == $n.service ]]; then
@@ -230,7 +224,7 @@ sync_mysql_databases="${sync_mysql_databases%%*( )}"
 
 if [[ -z "$sync_mysql_databases" ]]; then
    warn "No MySQL databases for syncing configured."
-elif [[ "$sync_mysql_databases" = "ALL" ]]; then
+elif [[ "$(trim "${sync_mysql_databases}")" = "ALL" ]]; then
    echononl "   Get MySQL databases from source Installation.."
    _mysql_databases_remote="$(${mysql_source_exe} ${mysql_source_credential_args} -N -s -e "show databases" 2> /dev/null)"
    if [[ $? -eq 0 ]];then