Add check cron mode

README.md

@@ -39,6 +39,8 @@ Usage : check_container_upgrade [-d] [-E /path/to/engine] [container1,...]
                             rebuilt on status file.
     --deploy-cron           Start in deploy cron mode: deploy containers known as rebuilt in status
                             file.
+    --check-cron            Start in check cron node: check if containers need to be updated and
+                            trigger their rebuild.
     -d                      Debug mode
     -l                      Log file
     -C                      Console logging (even if log file is specify)

check_container_upgrade

@@ -19,6 +19,7 @@ REBUILD=0
 REBUILD_DATA_DIR="/var/log/$(basename "$0")"
 REBUILD_CRON=0
 DEPLOY_CRON=0
+CHECK_CRON=0
 declare -rA CHECK_PLUGINS=(
     ["/usr/lib/nagios/plugins/check_apt"]="/usr/lib/nagios/plugins/check_apt -u -U -t 60 -l"
     ["/usr/lib/nagios/plugins/check_apk"]="/usr/lib/nagios/plugins/check_apk"
@@ -161,6 +162,8 @@ Usage : $(basename "$0") [-d] [-E /path/to/engine] [container1,...]
                             rebuilt on status file.
     --deploy-cron           Start in deploy cron mode: deploy containers known as rebuilt in status
                             file.
+    --check-cron            Start in check cron node: check if containers need to be updated and
+                            trigger their rebuild.
     -d                      Debug mode
     -l                      Log file
     -C                      Console logging (even if log file is specify)
@@ -223,6 +226,9 @@ while [[ $idx -le $# ]]; do
         --deploy-cron)
             DEPLOY_CRON=1
         ;;
+        --check-cron)
+            CHECK_CRON=1
+        ;;
         *)
             ONLY_CONTAINERS+=( "$OPT" )
         ;;
@@ -448,20 +454,21 @@ debug "Upgradable containers (${#UPGRADABLE_CONTAINERS[@]}): $( implode ", " "${
 debug "Containers with errors (${#ERRORS[@]}): $( implode ", " "${!ERRORS[@]}" )"
 debug "Not found containers (${#NOTFOUNDS[@]}): $( implode ", " "${NOTFOUNDS[@]}" )"
 
-# Compute performance data
-(( CONTAINER_COUNTS=${#CHECKED_CONTAINERS[@]}+${#NOTFOUNDS[@]} ))
-PERF_DATA=(
+if [[ $CHECK_CRON -eq 0 ]]; then
+    # Compute performance data
+    (( CONTAINER_COUNTS=${#CHECKED_CONTAINERS[@]}+${#NOTFOUNDS[@]} ))
+    PERF_DATA=(
         "uptodate_containers=${#UP_TO_DATE[@]};;;0;$CONTAINER_COUNTS"
         "upgradable_containers=${#UPGRADABLE_CONTAINERS[@]};;;0;$CONTAINER_COUNTS"
         "containers_with_errors=${#ERRORS[@]};1;;0;$CONTAINER_COUNTS"
         "unknown_state_containers=${#UNKNOWNS[@]};;;0;$CONTAINER_COUNTS"
-)
+    )
 
-# Compute performance data as string
-PERF_DATA_TXT="$( implode " " "${PERF_DATA[@]}" )"
+    # Compute performance data as string
+    PERF_DATA_TXT="$( implode " " "${PERF_DATA[@]}" )"
 
-# Display check result message
-case $EXIT_CODE in
+    # Display check result message
+    case $EXIT_CODE in
         0)
             message "OK - All ${#UP_TO_DATE[@]} container(s) are up-to-date |$PERF_DATA_TXT"
             ;;
@@ -474,7 +481,8 @@ case $EXIT_CODE in
         *)
             message "UNKNOWN - fail to retrieve status of ${#UNKNOWNS[@]} container(s) |$PERF_DATA_TXT"
             ;;
-esac
+    esac
+fi
 
 # Trigger container build (if need, enabled and docker compose file is provided)
 if [[ $REBUILD -eq 1 ]]; then
@@ -544,7 +552,7 @@ if [[ $REBUILD -eq 1 ]]; then
         done
 
         # Handle rebuilt containers
-        if [[ ${#REBUILT_CONTAINERS[@]} -gt 0 ]]; then
+        if [[ ${#REBUILT_CONTAINERS[@]} -gt 0 ]] && [[ $CHECK_CRON -eq 0 ]]; then
             message
             message "Some containers are ready to be recreated and restarted."
             message "Run the following command to do it:"
@@ -560,9 +568,11 @@ for container in "${!ERRORS[@]}"; do
     message "${container}" - "${ERRORS[${container}]}"
 done
 
-for container in "${!UP_TO_DATE[@]}"; do
+if [[ $CHECK_CRON -eq 0 ]]; then
+    for container in "${!UP_TO_DATE[@]}"; do
         message "${container}" - "${UP_TO_DATE[${container}]}"
-done
+    done
+fi
 
 exit $EXIT_CODE