From 100b57ad3706919b976605cd696eb0dda1eacf90 Mon Sep 17 00:00:00 2001
From: Firmy Yang <firmianay@gmail.com>
Date: Fri, 11 Sep 2020 13:51:15 +0800
Subject: [PATCH] Update build.sh

root@82f5b62df3a2:~# cat /etc/lsb-release
DISTRIB_DESCRIPTION="Ubuntu 16.04.7 LTS"
root@82f5b62df3a2:~# sh -c 'echo $UID'

root@82f5b62df3a2:~# bash -c 'echo $UID'
0
root@82f5b62df3a2:~# sh -c 'echo `id -u`'
0
root@82f5b62df3a2:~# bash -c 'echo `id -u`'
0
---
 build.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build.sh b/build.sh
index b1bc341..362b459 100755
--- a/build.sh
+++ b/build.sh
@@ -2,7 +2,7 @@
 # Script to download squashfs-tools v4.3, apply the patches, perform a clean build, and install.
 
 # If not root, perform 'make install' with sudo
-if [ "$UID" = "0" ]
+if [ $(id -u) = "0" ]
 then
     SUDO=""
 else