Taken over some parts from update_psa:

cloning of customer_repository, some sanity checks, check for available
updates.

update_psa_impl

@@ -32,9 +32,37 @@ collect_current_configuration () {
 
 update_psa() {
     update_psa_activated    # message to ISMAS
-            
     local func="${FUNCNAME[0]}"
     
+    check_default_route
+    check_route_to_repository "185.191.219.134" # git.mimbach.de
+    # even for a git clone a running APISM is needed 
+    check_for_running_apism
+
+    # an initial clone of the customer-repository (e.g. customer_281) is 
+    # always possible, even without a ISMAS-WAIT-button
+    clone_customer_repository ${CUSTOMER_REPOSITORY_PATH}
+    check_sanity_of_repository
+    $INITIAL_CLONE && return 0
+
+    if [ "$MAINTENANCE" = "NO" ]; then
+        log_info "update_psa:${LINENO}: MAINTENANCE OFF. Checking for updates..."
+        # someone must have activated the WAIT-button in ISMAS. 
+        # Request the status of this button in updates_available().
+        if ! updates_available; then 
+            update_psa_false_alarm "update requested, but no WAIT state detected !!!"
+            log_fatal "update_psa:${LINENO}: update requested, but no WAIT state detected !!!"
+        fi
+    else
+        # simulate an activated WAIT-button
+        set_updates_available
+        while :
+        do
+            sleep 5
+            updates_available && break
+        done 
+    fi
+
     log_debug "$func:${LINENO}: fetch/merge updates..."
    
     # Fetch new updates (using git). but only when repository has already been
@@ -50,92 +78,5 @@ update_psa() {
     fi
             
     update_psa_pull_customer_repository # message to ISMAS
-
-    # no backup necessary as saved in git-repo
-    
-    # local changed_files=$(changed_file_names)
-   
-    if [[ -f "$GIT_PULL_TMP" ]]; then 
-        # TODO
-        if ! check_hardware_compatibility "$files_to_copy" ; then
-            local __r=$?
-            log_error "$func:${LINENO}: json/ini-files not fit for PSA"
-            revert_customer_repository
-            exit $__r
-        fi
-    fi
-
-    if [[ -f "$OPKG_CMDS_TMP" ]]; then
-        local commands="$(cat ${OPKG_CMDS_TMP} | tr '\n' '; ')"
-        log_info "$func:${LINENO}: executed opkg commands"
-        update_psa_install_opkg_packages $UPDATE_ISMAS_PROGRESS \
-            $RC_SUCCESS "$commands"
-    else
-        log_info "$func:${LINENO}: no opkg commands to execute"
-        update_psa_install_opkg_packages $UPDATE_ISMAS_PROGRESS \
-            $RC_SUCCESS "no opkg commands to execute"
-    fi
-        
-    # check if the opkg-command-file has been changed during 'git pull'
-    #if grep -qE ".*opkg_commands.*?" <<< $changed_files; then
-    #    # read opkg_cmds: each line respresents an opkg-command
-    #    readarray opkg_commands < <(cat $OPKG_CMDS_PSA_FILE)
-    #    for opkg_c in "${opkg_commands[@]}"; do
-    #        if grep -qE "^\s*[#]+.*$" <<< $opkg_c; then
-    #            continue    # found comment line
-    #        fi
-
-    #        # package manipulation commands without package:
-    #        local cwp="update|upgrade|clean"
-    #        # informational commands without package:
-    #        cwp="${cwp}|list|list-installed|list-upgradable"
-
-    #        if grep -qE "^.*\s+($cwp)\s+.*$" <<< $opkg_c; then
-    #            local p=$(printf '%s' "$opkg_c" | awk '{ print $NF }')
-    #            local opkg_output=()
-    #            if ! exec_opkg_info "$p" opkg_output; then
-    #                log_error "$func:${LINENO}: opkg info $opkg_c failed"
-    #                revert_customer_repository ; exit 1
-    #            fi
-
-    #            if ! check_md5_for_opkg_packages opkg_output; then
-    #                log_error "$func:${LINENO}: "\
-    #                    "wrong md5sum for opkg packages"
-    #                revert_customer_repository ; exit 1
-    #            fi
-    #        fi
-    #        
-    #        # perform a dry-run and check if everything might work as expected. 
-    #        if ! exec_opkg_noaction $opkg_c; then
-    #                log_error "$func:${LINENO}: "\
-    #                    "opkg --noaction $opkg_c failed"
-    #        fi
-
-    #        # Actually execute the opkg command
-    #        if ! exec_opkg $opkg_c; then
-    #            log_error "$func:${LINENO}: exec_opkg $opkg_c failed"
-    #            fallback_to_previous_version
-    #            revert_customer_repository ; exit 1
-    #        fi
-    #    done
-    #else
-    #    log_info "$func:${LINENO}: no opkg commands to execute"
-    #    update_psa_install_opkg_packages $UPDATE_ISMAS_PROGRESS \
-    #            $RC_SUCCESS "no opkg commands to execute"
-    #fi
-    
-    # Cleanup.
-    #if ! cleanup_previous_version; then
-    #    log_error "$func:${LINENO}: cleanup_previous_version failed"
-    #fi
-
-    # compute version string for current (i.e. new) version
-    compute_version
-
-    update_psa_cleanup $UPDATE_ISMAS_PROGRESS \
-        $RC_SUCCESS "cleanup after psa update"
-
-    # TODO
-    exit 0
 }