Allow configuration of Helm file limits

This allows custom configuration of the Helm file read limits, allowing
a user to overwrite them to their likenings if the defaults are too
restrictive for their specific setup using arguments:

`--helm-{index,chart,chart-file}-max-size`

Signed-off-by: Hidde Beydals <hello@hidde.co>

main.go

@@ -45,6 +45,7 @@ import (
 
 	sourcev1 "github.com/fluxcd/source-controller/api/v1beta1"
 	"github.com/fluxcd/source-controller/controllers"
+	"github.com/fluxcd/source-controller/internal/helm"
 	// +kubebuilder:scaffold:imports
 )
 
@@ -79,6 +80,9 @@ func main() {
 		concurrent            int
 		requeueDependency     time.Duration
 		watchAllNamespaces    bool
+		helmIndexLimit        int64
+		helmChartLimit        int64
+		helmChartFileLimit    int64
 		clientOptions         client.Options
 		logOptions            logger.Options
 		leaderElectionOptions leaderelection.Options
@@ -98,7 +102,15 @@ func main() {
 	flag.IntVar(&concurrent, "concurrent", 2, "The number of concurrent reconciles per controller.")
 	flag.BoolVar(&watchAllNamespaces, "watch-all-namespaces", true,
 		"Watch for custom resources in all namespaces, if set to false it will only watch the runtime namespace.")
-	flag.DurationVar(&requeueDependency, "requeue-dependency", 30*time.Second, "The interval at which failing dependencies are reevaluated.")
+	flag.Int64Var(&helmIndexLimit, "helm-index-max-size", helm.MaxIndexSize,
+		"The max allowed size in bytes of a Helm repository index file.")
+	flag.Int64Var(&helmChartLimit, "helm-chart-max-size", helm.MaxChartSize,
+		"The max allowed size in bytes of a Helm chart file.")
+	flag.Int64Var(&helmChartFileLimit, "helm-chart-file-max-size", helm.MaxChartFileSize,
+		"The max allowed size in bytes of a file in a Helm chart.")
+	flag.DurationVar(&requeueDependency, "requeue-dependency", 30*time.Second,
+		"The interval at which failing dependencies are reevaluated.")
+
 	clientOptions.BindFlags(flag.CommandLine)
 	logOptions.BindFlags(flag.CommandLine)
 	leaderElectionOptions.BindFlags(flag.CommandLine)
@@ -106,6 +118,11 @@ func main() {
 
 	ctrl.SetLogger(logger.NewLogger(logOptions))
 
+	// Set upper bound file size limits Helm
+	helm.MaxIndexSize = helmIndexLimit
+	helm.MaxChartSize = helmChartLimit
+	helm.MaxChartFileSize = helmChartFileLimit
+
 	var eventRecorder *events.Recorder
 	if eventsAddr != "" {
 		if er, err := events.NewRecorder(eventsAddr, controllerName); err != nil {