Force LANG=C before appending rest of environment, as only first occurence is used

builder/amazon/chroot/communicator.go

@@ -89,8 +89,8 @@ func (c *Communicator) UploadDir(dst string, src string, exclude []string) error
 
 	var stderr bytes.Buffer
 	cmd := ShellCommand(cpCmd)
-	cmd.Env = append(cmd.Env, os.Environ()...)
 	cmd.Env = append(cmd.Env, "LANG=C")
+	cmd.Env = append(cmd.Env, os.Environ()...)
 	cmd.Stderr = &stderr
 	err = cmd.Run()
 	if err == nil {

builder/parallels/iso/host_ip_ifconfig.go

@@ -34,11 +34,10 @@ func (f *IfconfigIPFinder) HostIP() (string, error) {
 		stdout := new(bytes.Buffer)
 
 		cmd := exec.Command(ifconfigPath, device)
-		cmd.Env = append(cmd.Env, os.Environ()...)
-
 		// Force LANG=C so that the output is what we expect it to be
 		// despite the locale.
 		cmd.Env = append(cmd.Env, "LANG=C")
+		cmd.Env = append(cmd.Env, os.Environ()...)
 
 		cmd.Stdout = stdout
 		cmd.Stderr = new(bytes.Buffer)

builder/vmware/iso/host_ip_ifconfig.go

@@ -33,11 +33,10 @@ func (f *IfconfigIPFinder) HostIP() (string, error) {
 	stdout := new(bytes.Buffer)
 
 	cmd := exec.Command(ifconfigPath, f.Device)
-	cmd.Env = append(cmd.Env, os.Environ()...)
-
 	// Force LANG=C so that the output is what we expect it to be
 	// despite the locale.
 	cmd.Env = append(cmd.Env, "LANG=C")
+	cmd.Env = append(cmd.Env, os.Environ()...)
 
 	cmd.Stdout = stdout
 	cmd.Stderr = new(bytes.Buffer)