From f9c5745c63fb6ae8342c689ea9a4c8c4dce14d4d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20JACQUES?= <hypnoce@donarproject.org>
Date: Tue, 12 Apr 2022 15:54:14 +0200
Subject: [PATCH] Fixes #2046: make target stage lookup case insensitive
 (#2047)

---
 pkg/dockerfile/dockerfile.go      |  2 +-
 pkg/dockerfile/dockerfile_test.go | 11 ++++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/pkg/dockerfile/dockerfile.go b/pkg/dockerfile/dockerfile.go
index 353185fee..3dd88cab3 100644
--- a/pkg/dockerfile/dockerfile.go
+++ b/pkg/dockerfile/dockerfile.go
@@ -197,7 +197,7 @@ func targetStage(stages []instructions.Stage, target string) (int, error) {
 		return len(stages) - 1, nil
 	}
 	for i, stage := range stages {
-		if stage.Name == target {
+		if strings.EqualFold(stage.Name, target) {
 			return i, nil
 		}
 	}
diff --git a/pkg/dockerfile/dockerfile_test.go b/pkg/dockerfile/dockerfile_test.go
index 64279c9e2..f61398689 100644
--- a/pkg/dockerfile/dockerfile_test.go
+++ b/pkg/dockerfile/dockerfile_test.go
@@ -261,6 +261,9 @@ func Test_targetStage(t *testing.T) {
 	FROM scratch AS second
 	COPY --from=0 /hi /hi2
 
+	FROM scratch AS UPPER_CASE
+	COPY --from=0 /hi /hi2
+
 	FROM scratch
 	COPY --from=second /hi2 /hi3
 	`
@@ -280,10 +283,16 @@ func Test_targetStage(t *testing.T) {
 			targetIndex: 1,
 			shouldErr:   false,
 		},
+		{
+			name:        "test valid upper case target",
+			target:      "UPPER_CASE",
+			targetIndex: 2,
+			shouldErr:   false,
+		},
 		{
 			name:        "test no target",
 			target:      "",
-			targetIndex: 2,
+			targetIndex: 3,
 			shouldErr:   false,
 		},
 		{