Fix display of dotted field names

- Fixes: #1825

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

CHANGELOG.md

@@ -12,6 +12,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Replaced unreadable >= character external sphinx module for pdf doc build.
 - Handle missing ipmi fields during bmc commands. #1768
 - Properly configure a default IPMI template during `wwctl upgrade nodes --add-defaults`.
+- Fixed display of dotted field names. #1825
 
 ### Changed
 

internal/pkg/node/fields.go

@@ -114,7 +114,7 @@ func getNestedFieldValue(obj interface{}, name string) (value reflect.Value, err
 		value = value.Elem()
 	}
 
-	fieldNames := strings.Split(name, ".")
+	fieldNames := splitFieldName(name)
 	for _, fieldName := range fieldNames {
 		var key string
 		fieldName, key = parseMapField(fieldName)
@@ -141,6 +141,45 @@ func getNestedFieldValue(obj interface{}, name string) (value reflect.Value, err
 	return
 }
 
+// splitName splits a string into components using the '.' character as a delimiter,
+// except when the '.' appears inside square brackets.
+//
+// For example, given the input "NetDevs[eth0.100].Type", it returns:
+//
+//	[]string{"NetDevs[eth0.100]", "Type"}
+func splitFieldName(s string) []string {
+	var parts []string
+	var current []rune
+	inBracket := false
+
+	for _, r := range s {
+		switch r {
+		case '[':
+			inBracket = true
+			current = append(current, r)
+		case ']':
+			inBracket = false
+			current = append(current, r)
+		case '.':
+			if inBracket {
+				// If we're inside brackets, keep the dot.
+				current = append(current, r)
+			} else {
+				// Outside brackets, split here.
+				parts = append(parts, string(current))
+				current = nil
+			}
+		default:
+			current = append(current, r)
+		}
+	}
+	// Append any remaining characters as the last part.
+	if len(current) > 0 {
+		parts = append(parts, string(current))
+	}
+	return parts
+}
+
 // getNestedFieldString retrieves the string representation
 // of a nested field as returned by getNestedFieldValue.
 //

internal/pkg/node/mergo_test.go

@@ -672,6 +672,18 @@ nodeprofiles:
 			source: "",
 			value:  "p1,p2",
 		},
+		"dotted netdev name": {
+			nodesConf: `
+nodes:
+  n1:
+    network devices:
+      eth0.100:
+        type: Ethernet`,
+			node:   "n1",
+			field:  "NetDevs[eth0.100].Type",
+			source: "",
+			value:  "Ethernet",
+		},
 		"node netdev tag": {
 			nodesConf: `
 nodes: