From 14c645dd969d377d8f49c40e1863e6aafe85754f Mon Sep 17 00:00:00 2001
From: Markus Pesch <markus.pesch@cryptic.systems>
Date: Sun, 27 Aug 2023 18:53:24 +0200
Subject: [PATCH] fix(dockerCompose): add Volume.MergeFirstWin()

---
 pkg/domain/dockerCompose/config.go | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/pkg/domain/dockerCompose/config.go b/pkg/domain/dockerCompose/config.go
index 6962bb5..1f01967 100644
--- a/pkg/domain/dockerCompose/config.go
+++ b/pkg/domain/dockerCompose/config.go
@@ -1129,6 +1129,25 @@ func (v *Volume) Equal(equalable Equalable) bool {
 	}
 }
 
+func (v *Volume) MergeFirstWin(volume *Volume) {
+	switch {
+	case v == nil && volume == nil:
+		fallthrough
+	case v != nil && volume == nil:
+		return
+
+	// WARN: It's not possible to change the memory pointer v *Volume to a new
+	// initialized Volume without returning the volume it self.
+	//
+	// case v == nil && volume != nil:
+	// 	v = NewVolume()
+	// 	fallthrough
+
+	default:
+		v.mergeFirstWinExternal(volume.External)
+	}
+}
+
 func (v *Volume) MergeLastWin(volume *Volume) {
 	switch {
 	case v == nil && volume == nil:
@@ -1148,6 +1167,13 @@ func (v *Volume) MergeLastWin(volume *Volume) {
 	}
 }
 
+func (v *Volume) mergeFirstWinExternal(external bool) {
+	if v.External {
+		return
+	}
+	v.External = true
+}
+
 func (v *Volume) mergeLastWinExternal(external bool) {
 	if v.External != external {
 		v.External = external