From 2ff16d5c5c8065d117cf9098e59dbe696ffa0160 Mon Sep 17 00:00:00 2001
From: Tianon Gravi <admwiggin@gmail.com>
Date: Tue, 30 Jan 2024 09:40:52 -0800
Subject: [PATCH] Fix `ArchLastStageFrom` with `oci-import` builder

Before:

```console
$ bashbrew cat --format '{{ .ArchLastStageFrom arch .TagEntry }}' ubuntu:latest
failed executing template for repo "ubuntu:latest"
template: --format:1:3: executing "--format" at <.ArchLastStageFrom>: error calling ArchLastStageFrom: runtime error: index out of range [-1]
```

After:

```console
$ bashbrew cat --format '{{ .ArchLastStageFrom arch .TagEntry }}' ubuntu:latest
scratch
```
---
 cmd/bashbrew/docker.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cmd/bashbrew/docker.go b/cmd/bashbrew/docker.go
index 4b8286d5..8dd91552 100644
--- a/cmd/bashbrew/docker.go
+++ b/cmd/bashbrew/docker.go
@@ -55,6 +55,9 @@ var dockerfileMetadataCache = map[string]*dockerfileMetadata{}
 func (r Repo) archDockerfileMetadata(arch string, entry *manifest.Manifest2822Entry) (*dockerfileMetadata, error) {
 	if builder := entry.ArchBuilder(arch); builder == "oci-import" {
 		return &dockerfileMetadata{
+			StageFroms: []string{
+				"scratch",
+			},
 			Froms: []string{
 				"scratch",
 			},