From b3f4d7569901cf062dc2a39d021c54ad36953aef Mon Sep 17 00:00:00 2001
From: Achilleas Koutsou <achilleas@koutsou.net>
Date: Fri, 25 Nov 2022 16:20:56 +0100
Subject: [PATCH] image: panic if unknown compression option is specified

Currently we only support "xz", but keeping it as a `switch` to easily
support more types in the future.
The empty string is also supported as a no-op.
---
 internal/image/live.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/internal/image/live.go b/internal/image/live.go
index a9e873e98..e42e752ac 100644
--- a/internal/image/live.go
+++ b/internal/image/live.go
@@ -1,6 +1,7 @@
 package image
 
 import (
+	"fmt"
 	"math/rand"
 
 	"github.com/osbuild/osbuild-composer/internal/artifact"
@@ -99,6 +100,11 @@ func (img *LiveImage) InstantiateManifest(m *manifest.Manifest,
 		xzPipeline := manifest.NewXZ(m, buildPipeline, artifactPipeline)
 		xzPipeline.Filename = img.Filename
 		artifact = xzPipeline.Export()
+	case "":
+		// do nothing
+	default:
+		// panic on unknown strings
+		panic(fmt.Sprintf("unsupported compression type %q", img.Compression))
 	}
 
 	return artifact, nil