Fix shellcheck findings

Author: brablc

disk-alerter.sh

@@ -4,14 +4,16 @@ source "./config.sh"
 source "./logger.sh"
 source "./checks.sh"
 
+DATA_PREFIX="$DATA_DIR/disk-alerter"
+
 function check_disks() {
   local swarm_name=$SWARM_NAME
   while read -r mount usage; do
     unique_name="${swarm_name} ${mount}"
     unique_code=$(echo "${unique_name,,}" | sed -e 's/ /_/g' -e 's/[^a-zA-Z0-9_-]/_/g')
     random_str=$(tr -dc 'a-zA-Z0-9' </dev/urandom | head -c 10)
     read -r unique_id _ < <(echo -n "$unique_name $random_str" | md5sum)
-    prefix="$DATA_DIR/${unique_code}"
+    prefix="${DATA_PREFIX}-${unique_code}"
     pending_file="${prefix}.pending"
     log_file="${prefix}.log"
 

nodes.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+# shellcheck disable=SC2002
+
 source "./config.sh"
 source "./logger.sh"
 source "./checks.sh"

port-alerter.sh

@@ -6,30 +6,32 @@ source "./checks.sh"
 
 declare -A REPORTED_SOCKS
 
+DATA_PREFIX="$DATA_DIR/port-alerter"
+
 function check_services() {
   local swarm_name=$SWARM_NAME
-  while read service_name network_alias check_type check_value; do
-    unique_name=$(echo "${swarm_name} ${service_name} ${network_alias} ${check_type} ${check_value}")
+  while read -r service_name network_alias check_type check_value; do
+    unique_name="${swarm_name} ${service_name} ${network_alias} ${check_type} ${check_value}"
     unique_code=$(echo "${unique_name,,}" | sed -e 's/ /_/g' -e 's/[^a-zA-Z0-9_-]/_/g')
     random_str=$(tr -dc 'a-zA-Z0-9' </dev/urandom | head -c 10)
-    read unique_id _ < <(echo -n "$unique_name $random_str" | md5sum)
-    prefix="$DATA_DIR/${unique_code}"
+    read -r unique_id _ < <(echo -n "$unique_name $random_str" | md5sum)
+    prefix="${DATA_PREFIX}-${unique_code}"
     pending_file="${prefix}.pending"
     log_file="${prefix}.log"
 
     if [[ $check_type == "port" ]]; then
       port=$check_value
       real_port="$port"
       # used for testing
-      if [[ -f "$DATA_DIR/test-change-port-$port" ]]; then
-        real_port=$(<"$DATA_DIR/test-change-port-$port")
+      if [[ -f "${DATA_PREFIX}-test-change-port-$port" ]]; then
+        real_port=$(<"${DATA_PREFIX}-test-change-port-$port")
       fi
       WAIT="tcp://$network_alias:$real_port"
       WHERE="via mesh"
     fi
 
     if [[ $check_type == "sock" ]]; then
-      IFS=":" read sock_type sock_file <<<"$check_value"
+      IFS=":" read -r _sock_type sock_file <<<"$check_value"
       if [[ ! -S $sock_file ]]; then
         if [[ ! -v REPORTED_SOCKS[$sock_file] ]]; then
           log_warn "Sock file $sock_file does not exist locally!"
@@ -44,43 +46,42 @@ function check_services() {
     action=""
     appendix=""
     message="${swarm_name} service ${service_name} (${network_alias}:${check_value})"
-    /usr/local/bin/dockerize -timeout 5s -wait "$WAIT" true 2>$log_file
-    if [ $? -ne 0 ]; then
+    if ! /usr/local/bin/dockerize -timeout 5s -wait "$WAIT" true 2>"$log_file"; then
       if [[ -f $pending_file ]]; then
         log_warn "Pending alert: $message"
       else
-        echo "$unique_id" >$pending_file
+        echo "$unique_id" >"$pending_file"
         action="create"
         appendix="not available $WHERE"
       fi
     else
       if [[ -f $pending_file ]]; then
         action="resolve"
         appendix="is available $WHERE"
-        unique_id=$(cat $pending_file)
-        rm -f $pending_file
+        unique_id=$(cat "$pending_file")
+        rm -f "$pending_file"
       fi
     fi
     if [[ -n $action ]]; then
       jq -n \
         --arg action "$action" \
         --arg unique_id "$unique_id" \
         --arg message "$message $appendix" \
-        --arg summary "$(cat $log_file)" \
+        --arg summary "$(cat "$log_file")" \
         '{
-                  "action": $action,
-                  "unique_id": $unique_id,
-                  "message": $message,
-                  "summary": $summary
-                }' | /bin/bash -c "$ALERT_SCRIPT"
+          "action": $action,
+          "unique_id": $unique_id,
+          "message": $message,
+          "summary": $summary
+         }' | /bin/bash -c "$ALERT_SCRIPT"
     fi
-    rm -f $log_file
+    rm -f "$log_file"
   done < <(./services.sh)
 }
 
 log_info "Port alerter is entering loop with ${LOOP_SLEEP} sleep on entry ..."
 
 while true; do
-  sleep $LOOP_SLEEP
+  sleep "$LOOP_SLEEP"
   check_services
 done

swarm-alerter.sh

@@ -4,21 +4,24 @@ source "./config.sh"
 source "./logger.sh"
 source "./checks.sh"
 
+DATA_PREFIX="$DATA_DIR/swarm-alerter"
+
 function check_nodes() {
   local active_node_count
-  active_node_count=$(./nodes.sh | wc -l)
   local swarm_name=$SWARM_NAME
-  local prefix="$DATA_DIR/swarm_failure"
+  local prefix="${DATA_PREFIX}"
   local pending_file="${prefix}.pending"
   local log_file="${prefix}.log"
   local where="at $HOSTNAME"
 
-  ./nodes.sh --verbose >"$log_file"
+  active_node_count=$(./nodes.sh | wc -l)
 
   action=""
   appendix=""
   message="${swarm_name} swarm active managers count $active_node_count"
   if ((SWARM_MANAGER_MIN > active_node_count)); then
+    ./nodes.sh --verbose &>"$log_file"
+
     if [[ -f $pending_file ]]; then
       log_warn "Pending alert: $message"
     else
@@ -48,7 +51,6 @@ function check_nodes() {
          "summary": $summary
        }' | /bin/bash -c "$ALERT_SCRIPT"
   fi
-  rm -f "$log_file"
 }
 
 log_info "Swarm alerter is entering loop with ${LOOP_SLEEP} sleep on entry ..."