@@ -27,6 +27,7 @@ add_note() {
 is_steamos() {
   [[ -r /etc/os-release ]] || return 1
   (
+    # shellcheck source=/dev/null
     source /etc/os-release
     [[ "${ID:-}" == "steamos" || "${VARIANT_ID:-}" == "steamos" ]]
   )
@@ -50,6 +51,8 @@ check "Git on host" command -v git
 check "Ubuntu box exists" box_exists
 check "Git in box" distrobox enter "${BOX_NAME}" -- bash -lc 'command -v git'
 check "Node in box" distrobox enter "${BOX_NAME}" -- bash -lc 'command -v node'
+# HOME is intentionally expanded by the shell inside the Distrobox.
+# shellcheck disable=SC2016
 check "Codex CLI in box" distrobox enter "${BOX_NAME}" -- bash -lc 'command -v codex || test -x "${HOME}/.local/bin/codex" || test -x "${HOME}/.codex/bin/codex"'
 check "ChatGPT app in box" distrobox enter "${BOX_NAME}" -- bash -lc 'command -v chatgpt'
 check "/home/deck visible in box" distrobox enter "${BOX_NAME}" -- test -d /home/deck
@@ -65,4 +68,3 @@ fi
 
 printf '\nSummary: %d passed, %d failed, %d notes\n' "${passed}" "${failed}" "${notes}"
 (( failed == 0 ))
-