Watch for temp APT file if APT upgrade is available

cluster/apt.apply.update.sh

@@ -16,6 +16,9 @@ readonly NBARGS="${#}"
 ## Export DEBUG for sub-script
 export DEBUG
 
+# Temp file to monitor
+readonly APT_TMP_FILE="/tmp/.apt.upgrade"
+
 ## Colors
 readonly PURPLE='\033[1;35m'
 readonly RED='\033[0;31m'
@@ -65,24 +68,16 @@ debug_message() {                                               # {{{
 # }}}
 is_apt_upgrade_absent() {                                                # {{{
 
-	## Count the number of upgradable packages and substract 1 for the header
+	## Check if temp APT upgrade file is absent
-	#local_apt_upgrade_number="$(apt list --upgradable \
+	if [ ! -f "${APT_TMP_FILE}" ]; then
-		#| wc -l \
-		#| awk '{print $1-1}')"
-	local_apt_upgrade_number="5"
-
-	case "${local_apt_upgrade_number}" in
-		0 ) ## No available upgrade
 		return_apt_upgrade_absent="0"
-			;;
-		* ) ## Upgrade seems available
-			return_apt_upgrade_absent="1"
-			;;
-esac
-
-	## Simple debug message to valid current variable
 		debug_message "is_apt_upgrade_absent − \
-APT upgrade available for this system: ${RED}${local_apt_upgrade_number:=/dev/null}${COLOR_DEBUG}."
+NO APT upgrade available for this system."
+	else
+		return_apt_upgrade_absent="1"
+		debug_message "is_apt_upgrade_absent − \
+APT upgrade seems available for this system."
+	fi
 
 	return "${return_apt_upgrade_absent}"
 
@@ -90,23 +85,16 @@ APT upgrade available for this system: ${RED}${local_apt_upgrade_number:=/dev/nu
 # }}}
 is_apt_upgrade_present() {                                      # {{{
 
-	## Count the number of upgradable packages and substract 1 for the header
+	## Check if temp APT upgrade file exists
-	local_apt_upgrade_number="$(apt list --upgradable \
+	if [ -f "${APT_TMP_FILE}" ]; then
-		| wc -l \
-		| awk '{print $1-1}')"
-
-	case "${local_apt_upgrade_number}" in
-		0 ) ## No available upgrade
-			return_apt_upgrade_present="1"
-			;;
-		* ) ## Upgrade seems available
 		return_apt_upgrade_present="0"
-			;;
+		debug_message "is_apt_upgrade_absent − \
-esac
+APT upgrade seems available for this system."
-
+	else
-	## Simple debug message to valid current variable
+		return_apt_upgrade_present="1"
-	debug_message "is_apt_upgrade_present − \
+		debug_message "is_apt_upgrade_absent − \
-APT upgrade available for this system: ${RED}${local_apt_upgrade_number:=/dev/null}${COLOR_DEBUG}."
+NO APT upgrade available for this system."
+	fi
 
 	return "${return_apt_upgrade_present}"
 
@@ -221,7 +209,7 @@ main() {                                                        # {{{
 	is_job_running "${sge_hostname}" \
 		&& exit 0
 
-	## If anything to maco is currently running
+	## If anything related to maco is currently running
 	### Exit
 	is_proc_running "${maco_proc_pattern}" \
 		&& exit 0