lint: enalble linter "wastedassign" (#2772)

.golangci.yml

@@ -295,10 +295,6 @@ issues:
         - nosprintfhostport
       text: "host:port in url should be constructed with net.JoinHostPort and not directly with fmt.Sprintf"
 
-    - linters:
-        - wastedassign
-      text: "assigned to .*, but reassigned without using the value"
-
     # https://github.com/timakin/bodyclose
     - linters:
         - bodyclose

cmd/crowdsec-cli/alerts.go

@@ -71,8 +71,7 @@ func SourceFromAlert(alert *models.Alert) string {
 
 	//try to compose a human friendly version
 	if *alert.Source.Value != "" && *alert.Source.Scope != "" {
-		scope := ""
-		scope = fmt.Sprintf("%s:%s", *alert.Source.Scope, *alert.Source.Value)
+		scope := fmt.Sprintf("%s:%s", *alert.Source.Scope, *alert.Source.Value)
 		extra := ""
 		if alert.Source.Cn != "" {
 			extra = alert.Source.Cn

cmd/crowdsec-cli/explain.go

@@ -188,10 +188,9 @@ func (cli cliExplain) run(cmd *cobra.Command, args []string) error {
 			}
 		}
 	}()
-	tmpFile := ""
 	// we create a  temporary log file if a log line/stdin has been provided
 	if logLine != "" || logFile == "-" {
-		tmpFile = filepath.Join(dir, "cscli_test_tmp.log")
+		tmpFile := filepath.Join(dir, "cscli_test_tmp.log")
 		f, err = os.Create(tmpFile)
 		if err != nil {
 			return err

pkg/acquisition/modules/appsec/utils.go

@@ -179,11 +179,9 @@ func (r *AppsecRunner) AccumulateTxToEvent(evt *types.Event, req *appsec.ParsedR
 
 	req.Tx.Variables().All(func(v variables.RuleVariable, col collection.Collection) bool {
 		for _, variable := range col.FindAll() {
-			key := ""
-			if variable.Key() == "" {
-				key = variable.Variable().Name()
-			} else {
-				key = variable.Variable().Name() + "." + variable.Key()
+			key := variable.Variable().Name()
+			if variable.Key() != "" {
+				key += "." + variable.Key()
 			}
 			if variable.Value() == "" {
 				continue
@@ -214,7 +212,7 @@ func (r *AppsecRunner) AccumulateTxToEvent(evt *types.Event, req *appsec.ParsedR
 			evt.Appsec.HasOutBandMatches = true
 		}
 
-		name := ""
+		var name string
 		version := ""
 		hash := ""
 		ruleNameProm := fmt.Sprintf("%d", rule.Rule().ID())

pkg/database/alerts.go

@@ -77,14 +77,11 @@ func formatAlertSource(alert *models.Alert) string {
 func formatAlertAsString(machineID string, alert *models.Alert) []string {
 	src := formatAlertSource(alert)
 
-	/**/
-	msg := ""
+	msg := "empty scenario"
 	if alert.Scenario != nil && *alert.Scenario != "" {
 		msg = *alert.Scenario
 	} else if alert.Message != nil && *alert.Message != "" {
 		msg = *alert.Message
-	} else {
-		msg = "empty scenario"
 	}
 
 	reason := fmt.Sprintf("%s by %s", msg, src)
@@ -116,7 +113,7 @@ func formatAlertAsString(machineID string, alert *models.Alert) []string {
 			reason = fmt.Sprintf("%s for %d/%d decisions", msg, i+1, len(alert.Decisions))
 		}
 
-		machineIDOrigin := ""
+		var machineIDOrigin string
 		if machineID == "" {
 			machineIDOrigin = *decisionItem.Origin
 		} else {

pkg/hubtest/parser_assert.go

@@ -107,7 +107,7 @@ func (p *ParserAssert) AssertFile(testFile string) error {
 			}
 
 			match := variableRE.FindStringSubmatch(scanner.Text())
-			variable := ""
+			var variable string
 
 			if len(match) == 0 {
 				log.Infof("Couldn't get variable of line '%s'", scanner.Text())

pkg/parser/runtime.go

@@ -319,7 +319,7 @@ func Parse(ctx UnixParserCtx, xp types.Event, nodes []Node) (types.Event, error)
 			}
 			clog.Tracef("node (%s) ret : %v", node.rn, ret)
 			if ParseDump {
-				parserIdxInStage := 0
+				var parserIdxInStage int
 				StageParseMutex.Lock()
 				if len(StageParseCache[stage][node.Name]) == 0 {
 					StageParseCache[stage][node.Name] = make([]dumps.ParserResult, 0)