enhance error handling in frontend commands

src/capture.c

@@ -287,6 +287,7 @@ static enum ec3_status capture_directory(
 	vnode.v_id = ctx->ctx_tree.fs_root->n_id;
 	ec3_volume_put_vnode(volume, &vnode);
 
+	enum ec3_status status2 = EC3_SUCCESS;
 	b_directory_iterator it;
 	b_directory_iterator_begin(dir, &it, B_DIRECTORY_ITERATE_PARENT_LAST);
 	while (b_directory_iterator_is_valid(&it)) {
@@ -300,7 +301,7 @@ static enum ec3_status capture_directory(
 
 		printf("file: %s\n", b_path_ptr(it.filepath));
 
-		enum ec3_status status2 = capture_file(
+		status2 = capture_file(
 			ctx,
 			volume,
 			dir,
@@ -334,7 +335,7 @@ static enum ec3_status capture_directory(
 	ec3_tag_ioctx_close(volu);
 
 	b_directory_release(dir);
-	return EC3_SUCCESS;
+	return status2;
 }
 
 static int capture(

src/tree.c

@@ -65,7 +65,9 @@ static enum ec3_status collect_children(
 		&chunk);
 
 	if (status != EC3_SUCCESS) {
-		b_err("cannot read chunk.");
+		char tmp[64];
+		ec3_chunk_id_to_string(parent->i_vnode.v_data, tmp, sizeof tmp);
+		b_err("cannot read chunk %s.", tmp);
 		return status;
 	}
 
@@ -98,11 +100,18 @@ static enum ec3_status collect_children(
 
 			child->i_name = b_string_steal(ctx->ctx_str);
 			child->i_depth = parent->i_depth + 1;
-			ec3_volume_get_vnode(
+			status = ec3_volume_get_vnode(
 				ctx->ctx_volume,
 				vnode_id,
 				&child->i_vnode);
 
+			if (status != EC3_SUCCESS) {
+				b_err("cannot find vnode %lu (child of %s)",
+				      vnode_id,
+				      parent->i_name);
+				return status;
+			}
+
 			b_queue_insert_after(
 				&ctx->ctx_stack,
 				&child->i_entry,