Add Warning when installing or upgrading a deprecated chart

Signed-off-by: Stanton Xu <xjiefeng@gmail.com>

cmd/helm/install.go

@@ -267,6 +267,11 @@ func (i *installCmd) run() error {
 		return prettyError(err)
 	}
 
+	if chartRequested.Metadata.Deprecated {
+		fmt.Fprintln(out, "WARNING: This chart is deprecated")
+	}
+
+
 	if req, err := chartutil.LoadRequirements(chartRequested); err == nil {
 		// If checkDependencies returns an error, we have unfulfilled dependencies.
 		// As of Helm 2.4.0, this is treated as a stopping condition:

cmd/helm/upgrade.go

@@ -266,6 +266,10 @@ func (u *upgradeCmd) run() error {
 		return prettyError(err)
 	}
 
+	if ch.Metadata.Deprecated {
+		fmt.Fprintln(out, "WARNING: This chart is deprecated")
+	}
+
 	resp, err := u.client.UpdateReleaseFromChart(
 		u.release,
 		ch,