fs_test: use os.Getuid() instead user.Current() to determine if a test is executed with root privileges.

This change lower the expectations on test env setup, i.e. tests could be executed in a container under a random UID,
without require an user in /etc/passwd

Signed-off-by: Predrag Knezevic <pknezevi@redhat.com>

internal/third_party/dep/fs/fs_test.go

@@ -35,7 +35,6 @@ import (
 	"io/ioutil"
 	"os"
 	"os/exec"
-	"os/user"
 	"path/filepath"
 	"runtime"
 	"sync"
@@ -175,13 +174,9 @@ func TestCopyDirFail_SrcInaccessible(t *testing.T) {
 		t.Skip("skipping on windows")
 	}
 
-	var currentUser, err = user.Current()
+	var currentUID = os.Getuid()
 
-	if err != nil {
+	if currentUID == 0 {
-		t.Fatalf("Failed to get name of current user: %s", err)
-	}
-
-	if currentUser.Name == "root" {
 		// Skipping if root, because all files are accessible
 		t.Skip("Skipping for root user")
 	}
@@ -214,13 +209,9 @@ func TestCopyDirFail_DstInaccessible(t *testing.T) {
 		t.Skip("skipping on windows")
 	}
 
-	var currentUser, err = user.Current()
+	var currentUID = os.Getuid()
 
-	if err != nil {
+	if currentUID == 0 {
-		t.Fatalf("Failed to get name of current user: %s", err)
-	}
-
-	if currentUser.Name == "root" {
 		// Skipping if root, because all files are accessible
 		t.Skip("Skipping for root user")
 	}
@@ -314,13 +305,9 @@ func TestCopyDirFailOpen(t *testing.T) {
 		t.Skip("skipping on windows")
 	}
 
-	var currentUser, err = user.Current()
+	var currentUID = os.Getuid()
-
-	if err != nil {
-		t.Fatalf("Failed to get name of current user: %s", err)
-	}
 
-	if currentUser.Name == "root" {
+	if currentUID == 0 {
 		// Skipping if root, because all files are accessible
 		t.Skip("Skipping for root user")
 	}
@@ -483,13 +470,9 @@ func TestCopyFileFail(t *testing.T) {
 		t.Skip("skipping on windows")
 	}
 
-	var currentUser, err = user.Current()
+	var currentUID = os.Getuid()
 
-	if err != nil {
+	if currentUID == 0 {
-		t.Fatalf("Failed to get name of current user: %s", err)
-	}
-
-	if currentUser.Name == "root" {
 		// Skipping if root, because all files are accessible
 		t.Skip("Skipping for root user")
 	}
@@ -574,13 +557,9 @@ func setupInaccessibleDir(t *testing.T, op func(dir string) error) func() {
 
 func TestIsDir(t *testing.T) {
 
-	var currentUser, err = user.Current()
+	var currentUID = os.Getuid()
 
-	if err != nil {
+	if currentUID == 0 {
-		t.Fatalf("Failed to get name of current user: %s", err)
-	}
-
-	if currentUser.Name == "root" {
 		// Skipping if root, because all files are accessible
 		t.Skip("Skipping for root user")
 	}
@@ -631,13 +610,9 @@ func TestIsDir(t *testing.T) {
 
 func TestIsSymlink(t *testing.T) {
 
-	var currentUser, err = user.Current()
+	var currentUID = os.Getuid()
-
-	if err != nil {
-		t.Fatalf("Failed to get name of current user: %s", err)
-	}
 
-	if currentUser.Name == "root" {
+	if currentUID == 0 {
 		// Skipping if root, because all files are accessible
 		t.Skip("Skipping for root user")
 	}