add script to validate length of clustergroup chart and pattern names

Author: dminnear-rh

Makefile

@@ -1,4 +1,4 @@
-NAME ?= $(shell basename "`pwd`")
+NAME ?= $(shell yq .global.pattern values-global.yaml)
 
 ifneq ($(origin TARGET_SITE), undefined)
   TARGET_SITE_OPT=--set main.clusterGroupName=$(TARGET_SITE)
@@ -189,13 +189,7 @@ validate-schema: ## validates values files against schema in common/clustergroup
 
 .PHONY: validate-prereq
 validate-prereq: ## verify pre-requisites
-	$(eval GLOBAL_PATTERN := $(shell yq -r .global.pattern values-global.yaml))
-	@if [ $(NAME) != $(GLOBAL_PATTERN) ]; then\
-		echo "";\
-		echo "WARNING: folder directory is \"$(NAME)\" and global.pattern is set to \"$(GLOBAL_PATTERN)\"";\
-		echo "this can create problems. Please make sure they are the same!";\
-		echo "";\
-	fi
+	@common/scripts/validate-names-length.sh
 	@if [ ! -f /run/.containerenv ]; then\
 	  echo "Checking prerequisites:";\
 	  echo -n "  Check for python-kubernetes: ";\

scripts/validate-names-length.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+
+MAX_CALCULATED_LENGTH=47
+
+print_explanation() {
+  echo "--------------------------------------------------------------------------------"
+  echo "Validation Explanation:"
+  echo "This script ensures that generated Kubernetes resource names do not exceed the 63-character limit."
+  echo "A DNS-compatible name is constructed in the 'clustergroup' Helm chart using the following pattern:"
+  echo "  -> {{ .Values.clusterGroup.name }}-gitops-server-{{ .Values.global.pattern }}-{{ .Values.clusterGroup.name }}"
+  echo ""
+  echo "The total length is calculated as:"
+  echo "  (2 * length of 'clusterGroup.name') + length of 'global.pattern' + 15 (for '-gitops-server-') + 1 (for the namespace separator '-')"
+  echo ""
+  echo "To stay under the 63-character limit, the variable part of the name must be less than $MAX_CALCULATED_LENGTH characters:"
+  echo "  (2 * length of 'clusterGroup.name') + length of 'global.pattern' < $MAX_CALCULATED_LENGTH"
+  echo "--------------------------------------------------------------------------------"
+}
+
+if [ ! -f "values-global.yaml" ]; then
+  echo "Error: Global values file 'values-global.yaml' not found."
+  exit 1
+fi
+
+global_pattern=$(yq .global.pattern "values-global.yaml")
+
+if [ "$global_pattern" == "null" ] || [ -z "$global_pattern" ]; then
+  echo "Error: '.global.pattern' not found or is empty in 'values-global.yaml'."
+  exit 1
+fi
+pattern_length=${#global_pattern}
+
+echo "Validating that the pattern and clustergroup names don't exceed DNS limits after the pattern is installed."
+echo ""
+
+validation_failed=false
+
+for file in values-*.yaml; do
+  group_name=$(yq .clusterGroup.name "$file")
+
+  if [ "$group_name" != "null" ] && [ -n "$group_name" ]; then
+    group_name_length=${#group_name}
+    total_length=$(( (2 * group_name_length) + pattern_length ))
+
+    echo "Checking file: $file"
+
+    if [ "$total_length" -ge "$MAX_CALCULATED_LENGTH" ]; then
+      echo "  -> FAILED: Length of clustergroup '$group_name' and pattern '$global_pattern' will exceed DNS limits in clustergroup chart. Please shorten one or both."
+      echo ""
+      validation_failed=true
+    else
+      echo "  -> PASSED: Length of clustergroup '$group_name' and pattern '$global_pattern' are within clustergroup chart limits."
+      echo ""
+    fi
+  fi
+done
+
+if $validation_failed; then
+  echo "One or more cluster group names failed the length validation."
+  print_explanation
+  exit 1
+else
+  echo "All names are within clustergroup chart limits."
+  exit 0
+fi