bats hangs when setup sources script with exec 3>&1

[happy-barney]

To Reproduce
Steps to reproduce the behavior:

1. Create example source.sh with following contents

exec 3>&1

2. Create example file.bats with following contents

setup () {
	. "${DIR}"/source.sh
}

@test "..." {
	run true
}

3. run bats file.bats

Expected behavior
Test should be executed

Environment (please complete the following information):

• Bats version:

$ bats -v
Bats 1.2.1

• operating system (including version):

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.4 LTS
Release:	22.04
Codename:	jammy

• bash --version:

GNU bash, version 5.1.16(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

• Install method: distribution package manager

Additional context
Writing my first tests using bats ... :-)

[martin-schulze-vireso]

Please note that this is far from the most recent bats version, so any fixes will only be available with much newer versions.

That being said, I believe this will be problematic even now. FD 3 is used internally by bats and interfering with it will result in problems. I am unsure, if we can do anything about that.

[happy-barney]

Can you mention it in documentation and suggest that users use some smarter mechanism?

exec {FD}>test.txt
echo line 1 >&$FD