fix: rule config overriding

go.mod

@@ -4,6 +4,7 @@ go 1.16
 
 require (
 	github.com/BurntSushi/toml v0.3.1
+	github.com/imdario/mergo v0.3.12
 	github.com/nicksnyder/go-i18n/v2 v2.1.2
 	github.com/spf13/cobra v1.1.3
 	golang.org/x/text v0.3.3

go.sum

@@ -89,6 +89,8 @@ github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO
 github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=
 github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2pPBoIllUwCN7I=
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
+github.com/imdario/mergo v0.3.12 h1:b6R2BslTbIEToALKP7LxUvijTsNI9TAe80pLWN2g/HU=
+github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=

validator/rules/executor.go

@@ -1,15 +1,17 @@
 package rules
 
 import (
-	"encoding/json"
 	"fmt"
 	"log"
 	"os"
 
 	"github.com/aerogear/charmil/validator"
+	"github.com/imdario/mergo"
 	"github.com/spf13/cobra"
 )
 
+// Rules is an interface that is implemented
+// by every rule defined in rules package
 type Rules interface {
 	Validate() []validator.ValidationError
 }
@@ -84,6 +86,7 @@ func (config *RuleConfig) validate(cmd *cobra.Command, info *validator.StatusLog
 		&MustExistHelper{cmd: cmd, config: config},
 	}
 
+	// traverse all rules and validate
 	for _, rule := range rules {
 		validationErrors := rule.Validate()
 		info.TotalErrors += len(validationErrors)
@@ -113,28 +116,22 @@ func (config *RuleConfig) initDefaultRules() {
 		},
 	}
 
-	// Check verbose input from user
-	var verbose bool
-	if config != nil && config.Verbose {
-		verbose = true
+	if err := mergo.Merge(&config.Length, defaultConfig.Length); err != nil {
+		log.Fatal(err)
 	}
+	config.Fields = append(config.Fields, defaultConfig.Fields...)
+	config.Fields = removeDuplicates(config.Fields)
+}
 
-	// Set Config to defaultConfig
-	*config = *defaultConfig
-	config.Verbose = verbose
-
-	// Merge the defaultConfig and Config given by user
-	if config.Length.Limits != nil && config.MustExist.Fields != nil {
-		out, err := json.Marshal(config)
-		if err != nil {
-			log.Fatal(err)
-		}
-		data := []byte(out)
-
-		errr := json.Unmarshal(data, &defaultConfig)
-		if errr != nil {
-			log.Fatal(errr)
+// remove duplicates from slice
+func removeDuplicates(input []string) []string {
+	keys := make(map[string]bool)
+	list := []string{}
+	for _, entry := range input {
+		if _, value := keys[entry]; !value {
+			keys[entry] = true
+			list = append(list, entry)
 		}
 	}
-
+	return list
 }