Re: [v2 PATCH] trap: Preserve parent traps for trap-only command substitution
Jilles Tjoelker <[email protected]>
| Newsgroups | org.kernel.vger.dash |
|---|---|
| Message-ID | <[email protected]> |
On Mon, Apr 15, 2024 at 06:17:36PM +0800, Herbert Xu wrote:
> v2 restricts the preservation to command substitution only and
> only if the command's first word is "trap".
> ---8<---
> Traps are reset when a subshell is started. When a subshell is
> started for command substitution with a simple command whose first
> word is "trap", preserve the parent trap text so that they can be
> printed.
It looks like this will execute the EXIT trap in a subshell $(trap).
On the other hand, things like $(trap "echo subshell exit >&2" EXIT) and
$(trap "echo other trap >&2" USR1) seem to be handled correctly.
I think the intent of https://austingroupbugs.net/view.php?id=53 is that
things like $('trap') and $(\trap) should also work (although an
expansion that expands to trap need not work).
--
Jilles Tjoelker