Add source bundle validation and inspection

internal/app/validate.go

@@ -3,12 +3,31 @@ package app
 import (
 	"context"
 	"fmt"
+	"io"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/adapters/local"
+	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
 )
 
 type ValidateOptions struct {
-	Path string
+	Path   string
+	Stdout io.Writer
 }
 
-func Validate(context.Context, ValidateOptions) error {
-	return fmt.Errorf("validate command: %w", ErrNotImplemented)
+func Validate(ctx context.Context, options ValidateOptions) error {
+	if options.Path == "" {
+		return fmt.Errorf("validate command requires a path")
+	}
+	backend, err := local.New(options.Path)
+	if err != nil {
+		return err
+	}
+	bundles, err := bundle.Discover(ctx, backend, "")
+	if err != nil {
+		return err
+	}
+	if options.Stdout != nil {
+		_, err = fmt.Fprintf(options.Stdout, "Validated %d bundle(s)\n", len(bundles))
+	}
+	return err
 }