From 46f5d38b1dc6a725e78bd53ca35a6299b4e91ece Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20Cornell=C3=A0?= <hello@mcornella.com>
Date: Fri, 28 Jan 2022 20:53:30 +0100
Subject: [PATCH] refactor(installer): use POSIX-standard's `id -u -n` to
 define `$USER`

---
 tools/install.sh | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tools/install.sh b/tools/install.sh
index 2290bc1eb..e64e39063 100755
--- a/tools/install.sh
+++ b/tools/install.sh
@@ -37,6 +37,13 @@
 #
 set -e
 
+# Make sure important variables exist if not already defined
+#
+# $USER is defined by login(1) which is not always executed (e.g. containers)
+# POSIX: https://pubs.opengroup.org/onlinepubs/009695299/utilities/id.html
+USER=${USER:-$(id -u -n)}
+
+
 # Track if $ZSH was provided
 custom_zsh=${ZSH:+yes}
 
@@ -51,9 +58,6 @@ CHSH=${CHSH:-yes}
 RUNZSH=${RUNZSH:-yes}
 KEEP_ZSHRC=${KEEP_ZSHRC:-no}
 
-# Sane defaults
-USER=${USER:-$(whoami)}
-
 
 command_exists() {
   command -v "$@" >/dev/null 2>&1