rootless: unexport GetUserNSForPid

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

Closes: #1371
Approved by: rhatdan

pkg/rootless/rootless_linux.go

@@ -92,7 +92,7 @@ func JoinNS(pid uint) (bool, int, error) {
 		return false, -1, nil
 	}
 
-	userNS, err := GetUserNSForPid(pid)
+	userNS, err := getUserNSForPid(pid)
 	if err != nil {
 		return false, -1, err
 	}
@@ -238,7 +238,7 @@ func getParentUserNs(fd uintptr) (uintptr, error) {
 	return (uintptr)(unsafe.Pointer(ret)), nil
 }
 
-// GetUserNSForPid returns an open FD for the first direct child user namespace that created the process
+// getUserNSForPid returns an open FD for the first direct child user namespace that created the process
 // Each container creates a new user namespace where the runtime runs.  The current process in the container
 // might have created new user namespaces that are child of the initial namespace we created.
 // This function finds the initial namespace created for the container that is a child of the current namespace.
@@ -250,7 +250,7 @@ func getParentUserNs(fd uintptr) (uintptr, error) {
 //                                    b
 //                                   /
 //        NS READ USING THE PID ->  c
-func GetUserNSForPid(pid uint) (*os.File, error) {
+func getUserNSForPid(pid uint) (*os.File, error) {
 	currentNS, err := readUserNs("/proc/self/ns/user")
 	if err != nil {
 		return nil, err

pkg/rootless/rootless_unsupported.go

@@ -3,8 +3,6 @@
 package rootless
 
 import (
-	"os"
-
 	"github.com/pkg/errors"
 )
 
@@ -38,8 +36,3 @@ func SkipStorageSetup() bool {
 func JoinNS(pid uint) (bool, int, error) {
 	return false, -1, errors.New("this function is not supported on this os")
 }
-
-// GetUserNSForPid returns an open FD for the first direct child user namespace that created the process
-func GetUserNSForPid(pid uint) (*os.File, error) {
-	return nil, errors.New("this function is not supported on this os")
-}