pkg/imagebuilder: expose BuiltInBuildArgs for downstream

Expose map BuiltInBuildArgs so downstream users like buildah can use it.

Signed-off-by: Aditya R <[email protected]>

dispatchers.go

@@ -22,6 +22,7 @@ import (
 	"github.com/containers/storage/pkg/regexp"
 	"github.com/openshift/imagebuilder/signal"
 	"github.com/openshift/imagebuilder/strslice"
+	"golang.org/x/exp/maps"
 )
 
 var (
@@ -42,6 +43,11 @@ var builtinBuildArgs = map[string]string{
 	"BUILDVARIANT":   localspec.Variant,
 }
 
+//  Exposes map of global built-in args with their respective populated values.
+func GetBuiltinBuildArgs() map[string]string {
+	return maps.Clone(builtinBuildArgs)
+}
+
 func init() {
 	if localspec.Variant != "" {
 		builtinBuildArgs["TARGETPLATFORM"] = builtinBuildArgs["TARGETPLATFORM"] + "/" + localspec.Variant

go.mod

@@ -38,6 +38,7 @@ require (
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635 // indirect
 	github.com/ulikunitz/xz v0.5.11 // indirect
+	golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1 // indirect
 	golang.org/x/mod v0.9.0 // indirect
 	golang.org/x/sys v0.7.0 // indirect
 	golang.org/x/tools v0.7.0 // indirect

go.sum

@@ -115,6 +115,8 @@ github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9dec
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1 h1:k/i9J1pBpvlfR+9QsetwPyERsqu1GIbi967PQMq3Ivc=
+golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1/go.mod h1:V1LtkGg67GoY2N1AnLN78QLrzxkLyJw7RJb1gzOOz9w=
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.9.0 h1:KENHtAZL2y3NLMYZeHY9DW8HW8V+kQyJsY/V9JlKvCs=