Fix hardlink unit test

Now that hardlink destinations take into account the directory that they are being extracted to, the unit test had to be updated to make sure that two hardlinks were extracted to /tmp/hardlink correctly.

pkg/util/fs_util_test.go

@@ -367,7 +367,7 @@ func filesAreHardlinks(first, second string) checker {
 		if err != nil {
 			t.Fatalf("error getting file %s", first)
 		}
-		fi2, err := os.Stat(filepath.Join(second))
+		fi2, err := os.Stat(filepath.Join(root, second))
 		if err != nil {
 			t.Fatalf("error getting file %s", second)
 		}
@@ -499,11 +499,11 @@ func TestExtractFile(t *testing.T) {
 			tmpdir: "/tmp/hardlink",
 			hdrs: []*tar.Header{
 				fileHeader("/bin/gzip", "gzip-binary", 0751),
-				hardlinkHeader("/bin/uncompress", "/tmp/hardlink/bin/gzip"),
+				hardlinkHeader("/bin/uncompress", "/bin/gzip"),
 			},
 			checkers: []checker{
 				fileExists("/bin/gzip"),
-				filesAreHardlinks("/bin/uncompress", "/tmp/hardlink/bin/gzip"),
+				filesAreHardlinks("/bin/uncompress", "/bin/gzip"),
 			},
 		},
 	}