feat(cmd/run): file size limitation

Won't accept any resource/config file larger than 1MB, due to the limitation on K8S CustomResources

Ref apache#2003

pkg/cmd/run_help.go

@@ -132,6 +132,14 @@ func applyOption(config *RunConfigOption, integrationSpec *v1.IntegrationSpec,
 		}
 		integrationSpec.AddConfigurationAsResource(string(config.ConfigType), config.Value, string(resourceType), config.DestinationPath())
 	case ConfigOptionTypeFile:
+		// Don't allow a file size longer than 1 MiB
+		fileSize, err := fileSize(config.Value)
+		printSize := fmt.Sprintf("%.2f", float64(fileSize)/Megabyte)
+		if err != nil {
+			return err
+		} else if fileSize > Megabyte {
+			return fmt.Errorf("you cannot provide a file larger than 1 MB (it was %s MB), check configmap option or --volume instead", printSize)
+		}
 		// Don't allow a binary non compressed resource
 		rawData, contentType, err := loadRawContent(config.Value)
 		if err != nil {

pkg/cmd/util_content.go

@@ -22,10 +22,24 @@ import (
 	"io/ioutil"
 	"net/http"
 	"net/url"
+	"os"
 	"regexp"
 	"strings"
 )
 
+const (
+	Megabyte = 1 << 20
+	Kilobyte = 1 << 10
+)
+
+func fileSize(source string) (int64, error) {
+	fi, err := os.Stat(source)
+	if err != nil {
+		return -1, err
+	}
+	return fi.Size(), nil
+}
+
 func loadRawContent(source string) ([]byte, string, error) {
 	var content []byte
 	var err error