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Re: bug-report: debug trap messes up pipestatus if containing command su


From: Hengyang Zhao
Subject: Re: bug-report: debug trap messes up pipestatus if containing command substitution
Date: Mon, 20 May 2019 21:57:34 -0700

address@hidden address@hidden

On Mon, May 20, 2019 at 9:51 PM Hengyang Zhao <address@hidden> wrote:

> Dear bash developers,
>
> I found an unexpected behavior when engineering some code in a callback of
> DEBUG trap. The code has been distilled to expose this behavior:
>
> ### BEGIN
> my_func() {
>   local x=$(:)
> }
> trap my_func DEBUG
> false | true | false | true | false
> echo address@hidden
> # expects 1 0 1 0 1
> # gets 0 0 0 0 1
> ### END
>
> Configuration Information:
> Machine: x86_64
> OS: linux-gnu
> Compiler: gcc
> Compilation CFLAGS: -O2 -g -pipe -Wall -Werror=format-security
> -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions
> -fstack-protector-strong -grecord-gcc-switches
> -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
> -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
> -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
> -Wno-parentheses -Wno-format-security
> uname output: Linux fedora 5.0.9-301.fc30.x86_64 #1 SMP Tue Apr 23
> 23:57:35 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
> Machine Type: x86_64-redhat-linux-gnu
>
> This also happens on many of my OSes running bash 4.x.
>
> I'm happy to provide further information if needed.
>
> Thank you,
> Hengyang
>


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