diff --git a/read_config b/read_config
index dda5b2b..920be18 100755
--- a/read_config
+++ b/read_config
@@ -29,7 +29,7 @@ if [ ${read_config_sourced:-1} = "1" ]; then    # include only once
         fi
         log_debug "$func:${LINENO}: workspace_dir=$working_dir"
         
-        local customer_location=$(cat "$1" | jq -r .customer_location)
+        readonly customer_location=$(cat "$1" | jq -r .customer_location)
         if [ -z "$customer_location" ]; then 
             log_fatal "$func:${LINENO}: customer_location not set in $1"
         fi
@@ -57,9 +57,15 @@ if [ ${read_config_sourced:-1} = "1" ]; then    # include only once
             __zone_groups[$zg]=$__n_zones
         done
 
+        log_debug "$func:${LINENO}: reading ${1} done"
+        
+        return 0
+    }
 ###############################################################################
 ########################## parsing with jq finished ###########################
 ###############################################################################
+    check_sanity_of_repository () {
+        local func="${FUNCNAME[0]}"
 
         local __customer_base_dir="$working_directory/${workspace_dir}"
         __customer_base_dir="${__customer_base_dir}/${customer_id}"
@@ -86,38 +92,136 @@ if [ ${read_config_sourced:-1} = "1" ]; then    # include only once
         readonly zgroup=1
         readonly zone=1
         readonly customer_base_dir="${__customer_base_dir}/${zgroup}/${zone}"
-        log_debug "$func:${LINENO}: customer-base-dir="
-        log_debug "$func:${LINENO}:      $customer_base_dir"
+        if [ -d "$customer_base_dir" ]; then
+            log_debug "$func:${LINENO}: customer-base-dir="
+            log_debug "$func:${LINENO}:      $customer_base_dir"
+        else
+            log_fatal "$func:${LINENO}: $customer_base_dir does not exist"
+        fi
 
         readonly psa_config_dir="${customer_base_dir}/etc/psa_config"
-        log_debug "$func:${LINENO}: psa_config_dir="
-        log_debug "$func:${LINENO}:      $psa_config_dir"
-        
+        if [ -d "$psa_config_dir" ]; then
+            log_debug "$func:${LINENO}: psa_config_dir="
+            log_debug "$func:${LINENO}:      $psa_config_dir"
+        else
+            log_fatal "$func:${LINENO}:  $psa_config_dir does not exist"
+        fi
+
         readonly psa_update_dir="${customer_base_dir}/etc/psa_update"
-        log_debug "$func:${LINENO}: psa_update_dir="
-        log_debug "$func:${LINENO}:      $psa_update_dir"
-        
+        if [ -d "$psa_update_dir" ]; then
+            log_debug "$func:${LINENO}: psa_update_dir="
+            log_debug "$func:${LINENO}:      $psa_update_dir"
+        else
+            log_fatal "$func:${LINENO}:  $psa_update_dir does not exist"
+        fi
+
         readonly psa_base_ini_dir="${customer_base_dir}/opt/app"
-        log_debug "$func:${LINENO}: psa_base_ini_dir="
-        log_debug "$func:${LINENO}:      $psa_base_ini_dir"
+        if [ -d "$psa_base_ini_dir" ]; then
+            log_debug "$func:${LINENO}: psa_base_ini_dir="
+            log_debug "$func:${LINENO}:      $psa_base_ini_dir"
+        else
+            log_fatal "$func:${LINENO}: $psa_base_ini_dir does not exist"
+        fi
+        
+        readonly psa_sysconfig_dir="${psa_base_ini_dir}/sysconfig"
+        # if [ -d "$psa_syconfig_dir" ]; DOES NOT WORK !!!
+        if ls -al $psa_sysconfig_dir > /dev/null; then
+            log_debug "$func:${LINENO}: psa_sysconfig_dir="
+            log_debug "$func:${LINENO}:      $psa_sysconfig_dir"
+        else
+            log_error "$func:${LINENO}: $psa_sysconfig_dir does not exist"
+        fi
+
+        readonly psa_ismasmgr_dir="${psa_base_ini_dir}/ISMASMgr"
+        if [ -d "$psa_ismasmgr_dir" ]; then
+            log_debug "$func:${LINENO}: psa_ismasmgr_dir="
+            log_debug "$func:${LINENO}:      $psa_ismasmgr_dir"
+        else
+            log_fatal "$func:${LINENO}: $psa_ismasmgr_dir does not exist"
+        fi
+        
+        readonly psa_atbqt_dir="${psa_base_ini_dir}/ATBQT"
+        if [ -d "$psa_atbqt_dir" ]; then
+            log_debug "$func:${LINENO}: psa_atbqt_dir="
+            log_debug "$func:${LINENO}:      $psa_atbqt_dir"
+        else
+            log_fatal "$func:${LINENO}: $psa_atbqt_dir does not exist"
+        fi
+
+        readonly atbqt_ini="${psa_atbqt_dir}/ATBQT.ini"
+        if [ -f "$atbqt_ini" ]; then
+            log_debug "$func:${LINENO}: ATBTQT.ini="
+            log_debug "$func:${LINENO}:      $atbqt_ini"
+        else
+            log_fatal "$func:${LINENO}: $atbqt_ini does not exist"
+        fi
+
+        readonly ismasmgr_ismasmgr_ini="${psa_ismasmgr_dir}/ISMASMgr.ini"
+        if [ -f "$ismasmgr_ismasmgr_ini" ]; then
+            log_debug "$func:${LINENO}: ismasmgr_ismasmgr.ini="
+            log_debug "$func:${LINENO}:      $ismasmgr_ismasmgr_ini"
+        else
+            log_fatal "$func:${LINENO}: $ismasmgr_ismasmgr_ini does not exist"
+        fi
+
+        readonly sysconfig_ismasmgr_ini="${psa_sysconfig_dir}/ISMASMgr.ini"
+        if [ -f "$sysconfig_ismasmgr_ini" ]; then
+            log_debug "$func:${LINENO}: sysconfig_ismasmgr.ini="
+            log_debug "$func:${LINENO}:      $sysconfig_ismasmgr_ini"
+        else
+            log_fatal "$func:${LINENO}: $sysconfig_ismasmgr_ini does not exist"
+        fi
+
+        readonly sysconfig_sysconfig_ini="${psa_sysconfig_dir}/sysconfig.ini"
+        if [ -f "$sysconfig_sysconfig_ini" ]; then
+            log_debug "$func:${LINENO}: sysconfig_sysconfig.ini="
+            log_debug "$func:${LINENO}:      $sysconfig_sysconfig_ini"
+        else
+            log_fatal "$func:${LINENO}: $sysconfig_sysconfig_ini does not exist"
+        fi
+
+        readonly sysconfig_sysctrl_ini="${psa_sysconfig_dir}/SystemControl.ini"
+        if [ -f "$sysconfig_sysctrl_ini" ]; then
+            log_debug "$func:${LINENO}: sysconfig_systemcontrol.ini="
+            log_debug "$func:${LINENO}:      $sysconfig_sysctrl_ini"
+        else
+            log_fatal "$func:${LINENO}: $sysconfig_sysctrl_ini does not exist"
+        fi
 
         readonly emp_conf="${psa_config_dir}/emp.conf"
-        log_debug "$func:${LINENO}: emp.conf="
-        log_debug "$func:${LINENO}:      $emp_conf"
-        
+        if [ -f "$emp_conf" ]; then
+            log_debug "$func:${LINENO}: emp.conf="
+            log_debug "$func:${LINENO}:      $emp_conf"
+        else
+            log_fatal "$func:${LINENO}: $emp_conf does not exist"
+        fi
+
         readonly device_conf="${psa_config_dir}/device.conf"
-        log_debug "$func:${LINENO}: device.conf="
-        log_debug "$func:${LINENO}:      $device_conf"
+        if [ -f "$device_conf" ]; then
+            log_debug "$func:${LINENO}: device.conf="
+            log_debug "$func:${LINENO}:      $device_conf"
+        else
+            log_debug "$func:${LINENO}: $device_conf does not exist"
+        fi
         
         readonly printer_conf="${psa_config_dir}/printer.conf"
-        log_debug "$func:${LINENO}: printer.conf="
-        log_debug "$func:${LINENO}:      $printer_conf"
+        if [ -f "$printer_conf" ]; then
+            log_debug "$func:${LINENO}: printer.conf="
+            log_debug "$func:${LINENO}:      $printer_conf"
+        else
+            log_fatal "$func:${LINENO}: $printer_conf does not exist"
+        fi
 
         readonly opkg_cmds_file="${psa_update_dir}/opkg_commands"
-        log_debug "$func:${LINENO}: opkg_commands="
-        log_debug "$func:${LINENO}:      $opkg_cmds_file"
+        if [ -f "$opkg_cmds_file" ]; then
+            log_debug "$func:${LINENO}: opkg_commands="
+            log_debug "$func:${LINENO}:      $opkg_cmds_file"
+        else
+            log_fatal "$func:${LINENO}: $opkg_cmds_file does not exist"
+        fi
+        
+        log_debug "$func:${LINENO}: sanity of ${customer_repository_path} OK"
 
-        # FIXME: die "ini"-files fehlen noch
         return 0
     }
     # read_config UpdateController.conf