colcon silently does nothing

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Hi !

On

• Ubuntu 18.04
• I installed ROS Eloquant
• Followed this tutorial: https://index.ros.org/doc/ros2/Tutori...
• Everything was ok, until I reached the colcon build command.

• It was doing nothing, and gave no error, no message, verbose output was:

  $ colcon --log-level 10 build
  DEBUG:colcon:Parsed command line arguments: Namespace(build_base='build', continue_on_error=False, event_handlers=None, executor='sequential', install_base='install', log_base='log', log_level=10, main=<bound method BuildVerb.main of <colcon_core.verb.build.BuildVerb object at 0x7f8dc26f30b8>>, merge_install=False, paths='.', symlink_install=False, test_result_base=None, verb_extension=<colcon_core.verb.build.BuildVerb object at 0x7f8dc26f30b8>, verb_name='build', verb_parser=CustomArgumentParser(prog='/usr/bin/colcon build', usage=None, description='Build a set of packages.', formatter_class=<class 'colcon_core.command.CustomFormatter'>, conflict_handler='error', add_help=True))
  INFO:colcon.colcon_core.location:Using log path 'log/build_2019-11-14_16-30-55'
  [0.089s] INFO:colcon.colcon_core.executor:Executing jobs using 'sequential' executor
  [0.090s] DEBUG:colcon.colcon_core.executor.sequential:closing loop
  [0.090s] DEBUG:colcon.colcon_core.executor.sequential:loop closed
  [0.090s] DEBUG:colcon.colcon_core.event_reactor:joining thread
  [0.090s] DEBUG:colcon.colcon_core.event_reactor:joined thread
  [0.093s] INFO:colcon.colcon_core.plugin_system:Skipping extension 'colcon_core.shell.bat': Not used on non-Windows systems
  [0.093s] INFO:colcon.colcon_core.shell:Creating prefix script '/home/gdebrecz/works/dev_ws/install/local_setup.sh'
  [0.094s] INFO:colcon.colcon_core.shell:Creating prefix util module '/home/gdebrecz/works/dev_ws/install/_local_setup_util_sh.py'
  [0.095s] INFO:colcon.colcon_core.shell:Creating prefix chain script '/home/gdebrecz/works/dev_ws/install/setup.sh'
  
  $ echo $?
  0
  

with no error. ROS package was not build. What am I doing wrong ? thanks, G