openbmc-env: fix shellcheck errors

Signed-off-by: Patrick Williams <[email protected]>
Change-Id: I0a12cd34c3cff8381bfd6197c11eb91a4efcf0f4

openbmc-env

@@ -1,16 +1,18 @@
-if [ -n "$BASH_SOURCE" ]; then
-   OBMCROOT="`dirname $BASH_SOURCE`"
+#!/bin/bash
+if [ -n "${BASH_SOURCE[0]}" ]; then
+    OBMCROOT="$(dirname "${BASH_SOURCE[0]}")"
 elif [ -n "$ZSH_NAME" ]; then
-   OBMCROOT="`dirname $0`"
+    OBMCROOT="$(dirname "$0")"
 else
-   OBMCROOT="`pwd`"
+    OBMCROOT="$(pwd)"
 fi
 
-if [ -f $OBMCROOT/customrc ]; then
+if [ -f "$OBMCROOT/customrc" ]; then
     echo "### Sourcing customrc ###"
-    . $OBMCROOT/customrc
+    # shellcheck source=/dev/null
+    . "$OBMCROOT/customrc"
 fi
 
 echo "### Initializing OE build env ###"
-. $OBMCROOT/oe-init-build-env
-
+# shellcheck source=oe-init-build-env
+. "$OBMCROOT/oe-init-build-env"