add template file size to 3m and throw error

Signed-off-by: Weiping Cai <weiping.cai@daocloud.io>

cmd/helm/install.go

@@ -17,6 +17,7 @@ limitations under the License.
 package main
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"time"
@@ -192,6 +193,10 @@ func runInstall(args []string, client *action.Install, valueOpts *values.Options
 		return nil, err
 	}
 
+	if _, err := isLimitSize(chartRequested.Raw); err != nil {
+		return nil, err
+	}
+
 	if chartRequested.Metadata.Deprecated {
 		fmt.Fprintln(out, "WARNING: This chart is deprecated")
 	}
@@ -240,6 +245,20 @@ func isChartInstallable(ch *chart.Chart) (bool, error) {
 	return false, errors.Errorf("%s charts are not installable", ch.Metadata.Type)
 }
 
+// It is to limit the total size of the template file to 3m, and the content of files over 3m should not be allowed to be installed.
+//
+// This is because the server requires the requestbody to be less than 3m when creating secrets.For details, please refer to: https://github.com/kubernetes/kubernetes/blob/release-1.18/staging/src/k8s.io/apiserver/pkg/server/config.go#L323
+func isLimitSize(raw []*chart.File) (bool, error) {
+	totalSize := int64(0)
+	for _, r := range raw {
+		totalSize += int64(bytes.Count(r.Data, []byte("")))
+	}
+	if totalSize < int64(3 * 1024 * 1024) {
+		return true, nil
+	}
+	return false,errors.Errorf("Chart package too large, limit is 3MB.")
+}
+
 // Provide dynamic auto-completion for the install and template commands
 func compInstall(args []string, toComplete string, client *action.Install) ([]string, completion.BashCompDirective) {
 	requiredArgs := 1