Using safer bash config for Build Linux script

Build Linux

@@ -2,6 +2,11 @@
 #
 ## Wizard Kit: Live Linux Build Tool
 
+set -o errexit
+set -o errtrace
+set -o nounset
+set -o pipefail
+
 # Prep
 DATE="$(date +%F)"
 DATETIME="$(date +%F_%H%M)"
@@ -21,7 +26,7 @@ elif which vim >/dev/null 2>&1; then
 else
     EDITOR=vi
 fi
-if which sudo >/dev/null 2>&1; then
+if [ ! -z ${SUDO_USER+x} ]; then
     REAL_USER="$SUDO_USER"
 fi
 
@@ -243,15 +248,15 @@ function update_repo() {
 
     # Archive current files
     if [[ -d "$REPO_DIR" ]]; then
-        mkdir "$BUILD_DIR/Archive" 2>/dev/null
+        mkdir -p "$BUILD_DIR/Archive" 2>/dev/null
         archive="$BUILD_DIR/Archive/$(date "+%F_%H%M%S")"
         mv -bv "$REPO_DIR" "$archive"
     fi
     sleep 1s
 
     # Build custom repo packages
-    mkdir "$REPO_DIR" 2>/dev/null
-    mkdir "$TEMP_DIR" 2>/dev/null
+    mkdir -p "$REPO_DIR" 2>/dev/null
+    mkdir -p "$TEMP_DIR" 2>/dev/null
     pushd "$TEMP_DIR" >/dev/null
     while read -r p; do
         echo "Building: $p"
@@ -325,32 +330,38 @@ function build_full() {
 }
 
 # Check input
-case $1 in
+case ${1:-} in
     -b|--build-full)
         build_full
+        echo Done
         ;;
 
     -f|--fix-perms)
         fix_kit_permissions
+        echo Done
         ;;
 
     -i|--install-deps)
         install_deps
+        echo Done
         ;;
 
     -o|--build-iso)
         load_settings
         build_iso
+        echo Done
         ;;
     
     -p|--prep-live-env)
         load_settings
         copy_live_env
         update_live_env
+        echo Done
         ;;
 
     -u|--update-repo)
         update_repo
+        echo Done
         ;;
 
     *)