AMENT_TRACE_SETUP_FILES unbound variable

[Ryanf55]

Problem

I use protections in all bash scripts to prevent bugs. Bash protection of set -eu for unbound variables errors out when sourcing a ROS environment. With complicated shell scripts, -eu is used in CI to ensure all variables used are defined.

Steps to reproduce

set -eu
source /opt/ros/humble/setup.bash
>> Terminal closes

Logs

$ set -u 
$ source /opt/ros/humble/setup.bash
>>> bash: AMENT_TRACE_SETUP_FILES: unbound variable

Environment

• Ubuntu 22.04
• ROS 2 Humble (binaries)

Workaround

# My long script

# Add protection
set -euf -o pipefail

echo foo
echo bar
# lots of other custom code here

set +u  # temporary disable protection
source /opt/ros/humble/setup.bash
set -u # re-enable protection


# more custom code here