1 files changed, 11 insertions, 0 deletions
diff --git a/vendor/github.com/projectatomic/buildah/config.go b/vendor/github.com/projectatomic/buildah/config.go
index b39d2b6c6..731e3b80a 100644
--- a/vendor/github.com/projectatomic/buildah/config.go
+++ b/vendor/github.com/projectatomic/buildah/config.go
@@ -3,6 +3,7 @@ package buildah
 import (
 	"context"
 	"encoding/json"
+	"os"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -260,11 +261,21 @@ func (b *Builder) Env() []string {
 // built using an image built from this container.
 func (b *Builder) SetEnv(k string, v string) {
 	reset := func(s *[]string) {
+		getenv := func(name string) string {
+			for i := range *s {
+				val := strings.SplitN((*s)[i], "=", 2)
+				if len(val) == 2 && val[0] == name {
+					return val[1]
+				}
+			}
+			return name
+		}
 		n := []string{}
 		for i := range *s {
 			if !strings.HasPrefix((*s)[i], k+"=") {
 				n = append(n, (*s)[i])
 			}
+			v = os.Expand(v, getenv)
 		}
 		n = append(n, k+"="+v)
 		*s = n