Defame1297 8f5e4eeaa5 fix(hooks): scope install traps to subshells to prevent RETURN trap leak ...

trap '...' RETURN inside a function is NOT local to that function in bash
— it persists in the calling scope and fires on every subsequent function
return. After install_shellcheck set the trap, it fired again when
ensure_tool returned with $tmp_dir unbound, causing nounset abort.

Fix: change install functions from {} to () (subshell bodies) and use
trap EXIT instead of RETURN. The trap is now scoped to the subshell and
cannot leak to callers.

Also fixes double _os() call in install_jq and removes redundant local
declarations (subshells don't need them).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TP4EGbBg3XMcyF28Lx78XJ

2026-06-20 22:16:49 +00:00

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