removeprefix breaks compatibility with source builds on Nvidia Jetson

[robmasocco]

Bug report

Required Info:

• Operating System:
  • Ubuntu 20.04
  • Nvidia JetPack 5.1.1
  • Jetson Linux 35.3.1
• Installation type:
  • from source
• Version or commit hash:
  • 0c8ae6d
• DDS implementation:
  • Fast-RTPS
• Client library (if applicable):
  • N/A

Steps to reproduce issue

ros2 topic list

Expected behavior

Issued command works.

Actual behavior

Traceback (most recent call last):
  File "/opt/ros/humble/install/bin/ros2", line 33, in <module>
    sys.exit(load_entry_point('ros2cli==0.18.10', 'console_scripts', 'ros2')())
  File "/opt/ros/humble/install/lib/python3.8/site-packages/ros2cli/cli.py", line 91, in main
    rc = extension.main(parser=parser, args=args)
  File "/opt/ros/humble/install/lib/python3.8/site-packages/ros2topic/command/topic.py", line 41, in main
    return extension.main(args=args)
  File "/opt/ros/humble/install/lib/python3.8/site-packages/ros2topic/verb/list.py", line 55, in main
    with NodeStrategy(args) as node:
  File "/opt/ros/humble/install/lib/python3.8/site-packages/ros2cli/node/strategy.py", line 35, in __init__
    spawn_daemon(args)
  File "/opt/ros/humble/install/lib/python3.8/site-packages/ros2cli/node/daemon.py", line 148, in spawn_daemon
    fdlimit = int(line.removeprefix(string_to_find).strip())
AttributeError: 'str' object has no attribute 'removeprefix'

Additional information

Humble Hawksbill source builds are possible on Nvidia Jetson boards using JetPack 5.x, which is based on Ubuntu 20.04.
JetPack 5.x's Python version is 3.8, but removeprefix was added in Python version 3.9.

[clalancette]

Humble Hawksbill source builds are possible on Nvidia Jetson boards using JetPack 5.x, which is based on Ubuntu 20.04. JetPack 5.x's Python version is 3.8, but removeprefix was added in Python version 3.9.

Please feel free to open a PR targeting humble to fix it, we're happy to review.