From 25f6604046b98cc1838297b56e06574e48d0b383 Mon Sep 17 00:00:00 2001
From: Feroze Mohideen <feroze@porter.run>
Date: Mon, 18 Mar 2024 17:11:34 -0400
Subject: [PATCH] inject env var for deprectated builder

---
 cli/cmd/v2/build.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/cli/cmd/v2/build.go b/cli/cmd/v2/build.go
index 37e76bfc4d..cf7ee2c71c 100644
--- a/cli/cmd/v2/build.go
+++ b/cli/cmd/v2/build.go
@@ -151,6 +151,13 @@ func build(ctx context.Context, client api.Client, inp buildInput) buildOutput {
 			Buildpacks: inp.BuildPacks,
 		}
 
+		if buildConfig.Builder == "heroku/buildpacks:20" {
+			if opts.Env == nil {
+				opts.Env = map[string]string{}
+			}
+			opts.Env["ALLOW_EOL_SHIMMED_BUILDER"] = "1"
+		}
+
 		err := packAgent.Build(ctx, opts, buildConfig, "")
 		if err != nil {
 			output.Error = fmt.Errorf("error building image with pack: %w", err)