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errexit and local variable set by failing command

From: Krystian Wojtas
Subject: errexit and local variable set by failing command
Date: Wed, 01 Apr 2020 16:54:42 +0000

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-musl
Compiler: gcc
Compilation CFLAGS: -g -O2 -Wno-parentheses -Wno-format-security
uname output: Linux bc55e8b47896 5.3.0-42-generic #34~18.04.1-Ubuntu SMP Fri 
Feb 28 13:42:26 UTC 2020 x86_64 Linux
Machine Type: x86_64-pc-linux-musl

Bash Version: 5.0
Patch Level: 16
Release Status: release

        Script has set errexit flag. It runs function. Function declares local 
variable and set it to output of run subcommand. Subcommand fails. Script does 
not care and continue execution.

        When same function sets global variable instead of local one, the 
script is stopped by errexit flag as expected.

        Scripts are attached. Ouputs
bash-5.0# ./script-global-variable-ok.sh
This message should be printed
bash-5.0# ./script-local-variable-bug.sh
This message should be printed
Script should stop and this message should not be printed

Best regards,
Krystian Wojtas

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Attachment: script-global-variable-ok.sh
Description: application/shellscript

Attachment: script-local-variable-bug.sh
Description: application/shellscript

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