fix: Port pluginCommand & command warning

Signed-off-by: George Jenkins <gvjenkins@gmail.com>

pkg/plugin/plugin.go

@@ -83,7 +83,7 @@ type Metadata struct {
 	PlatformCommand []PlatformCommand `json:"platformCommand"`
 
 	// Command is the plugin command, as a single string.
-	// Providing a command will result in an error if PlatformCommand is also set.
+	// Providing a command will result in an deprecation warning if PlatformCommand is also set.
 	//
 	// The command will be passed through environment expansion, so env vars can
 	// be present in this command. Unless IgnoreFlags is set, this will
@@ -92,7 +92,7 @@ type Metadata struct {
 	// Note that command is not executed in a shell. To do so, we suggest
 	// pointing the command to a shell script.
 	//
-	// DEPRECATED: Use PlatformCommand instead. Remove in Helm 4.
+	// DEPRECATED: Use PlatformCommand instead
 	Command string `json:"command"`
 
 	// IgnoreFlags ignores any flags passed in from Helm
@@ -119,14 +119,14 @@ type Metadata struct {
 	PlatformHooks PlatformHooks `json:"platformHooks"`
 
 	// Hooks are commands that will run on plugin events, as a single string.
-	// Providing a hooks will result in an error if PlatformHooks is also set.
+	// Providing a command will result in an deprecation warning if PlatformHooks is also set.
 	//
 	// The command will be passed through environment expansion, so env vars can
 	// be present in this command.
 	//
 	// Note that the command is executed in the sh shell.
 	//
-	// DEPRECATED: Use PlatformHooks instead. Remove in Helm 4.
+	// DEPRECATED: Use PlatformHooks instead
 	Hooks Hooks
 
 	// Downloaders field is used if the plugin supply downloader mechanism
@@ -265,11 +265,11 @@ func validatePluginData(plug *Plugin, filepath string) error {
 	plug.Metadata.Usage = sanitizeString(plug.Metadata.Usage)
 
 	if len(plug.Metadata.PlatformCommand) > 0 && len(plug.Metadata.Command) > 0 {
-		return fmt.Errorf("both platformCommand and command are set in %q", filepath)
+		fmt.Printf("WARNING: both 'platformCommand' and 'command' are set in %q (this will become an error in a future Helm version)\n", filepath)
 	}
 
 	if len(plug.Metadata.PlatformHooks) > 0 && len(plug.Metadata.Hooks) > 0 {
-		return fmt.Errorf("both platformHooks and hooks are set in %q", filepath)
+		fmt.Printf("WARNING: both 'platformHooks' and 'hooks' are set in %q (this will become an error in a future Helm version)\n", filepath)
 	}
 
 	// We could also validate SemVer, executable, and other fields should we so choose.

pkg/plugin/plugin_test.go

@@ -496,8 +496,8 @@ func TestValidatePluginData(t *testing.T) {
 		{false, mockMissingMeta},         // Test if the metadata section missing
 		{true, mockNoCommand},            // Test no command metadata works
 		{true, mockLegacyCommand},        // Test legacy command metadata works
-		{false, mockWithCommand},         // Test platformCommand and command both set fails
+		{true, mockWithCommand},          // Test platformCommand and command both set works
-		{false, mockWithHooks},           // Test platformHooks and hooks both set fails
+		{true, mockWithHooks},            // Test platformHooks and hooks both set works
 	} {
 		err := validatePluginData(item.plug, fmt.Sprintf("test-%d", i))
 		if item.pass && err != nil {