From de2039479091b6515f182267d2d8046dc11c1531 Mon Sep 17 00:00:00 2001
From: Ben Brown <bbrown@lightstep.com>
Date: Tue, 17 Aug 2021 10:38:27 -0700
Subject: [PATCH] deepcopy: gen: match Go 1.17 build tag format

The Go team has started the process of replacing the old "// +build"
constraints with the new "//go:build" constraints. See the design
doc for more details here:

https://go.googlesource.com/proposal/+/master/design/draft-gobuild.md

What is relevant is that in Go 1.17, gofmt now synchronizes the two
styles. In particular, if gofmt is run against a deepcopy generated
file, it will add a new "//go:build" constraint.

See https://golang.org/doc/go1.17#gofmt for details.

This PR intends to make it so that the generated code is compliant with
the new gofmt style.
---
 pkg/deepcopy/gen.go                            | 3 ++-
 pkg/deepcopy/testdata/zz_generated.deepcopy.go | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkg/deepcopy/gen.go b/pkg/deepcopy/gen.go
index 54a72363b..7e674a80a 100644
--- a/pkg/deepcopy/gen.go
+++ b/pkg/deepcopy/gen.go
@@ -175,7 +175,8 @@ type ObjectGenCtx struct {
 // writeHeader writes out the build tag, package declaration, and imports
 func writeHeader(pkg *loader.Package, out io.Writer, packageName string, imports *importsList, headerText string) {
 	// NB(directxman12): blank line after build tags to distinguish them from comments
-	_, err := fmt.Fprintf(out, `// +build !ignore_autogenerated
+	_, err := fmt.Fprintf(out, `//go:build !ignore_autogenerated
+// +build !ignore_autogenerated
 
 %[3]s
 
diff --git a/pkg/deepcopy/testdata/zz_generated.deepcopy.go b/pkg/deepcopy/testdata/zz_generated.deepcopy.go
index 837147e78..825f1a4fd 100644
--- a/pkg/deepcopy/testdata/zz_generated.deepcopy.go
+++ b/pkg/deepcopy/testdata/zz_generated.deepcopy.go
@@ -1,3 +1,4 @@
+//go:build !ignore_autogenerated
 // +build !ignore_autogenerated
 
 // Code generated by controller-gen. DO NOT EDIT.