Executing of wrong command doesn't fail

As far as I understand this case is reproduced only for executing fuel2 with '--version', but not with other ones. Am I right?

Vitalii, you are right. Reproduced for any command which has double dashes. For example, 'fuel2 node --help' shows a common help. This behavior is reasonable for flags like '--debug, --verbose, --quiet' etc., but it definitely shouldn't work such way for '--help' and '--version'.

Sorry, I didn't catch your message clearly first time. No, you are not right - look at my previous message.

Fix proposed to branch: master
Review: https://review.openstack.org/388636

@Stanislaw, I've made some patch that fixes command execution only for '--help' option.
This patch makes help message more accurate and user-friendly, e.g.:

[root@fuel ~]# fuel2 env add nodes --help
usage: fuel2 env add nodes [-h] -e ENV -n NODES [NODES ...] -r ROLES
                           [ROLES ...]

Adds nodes to an environment with the specified roles.

optional arguments:
  -h, --help show this help message and exit
  -e ENV, --env ENV Id of the environment to add nodes to
  -n NODES [NODES ...], --nodes NODES [NODES ...]
                        Ids of the nodes to add.
  -r ROLES [ROLES ...], --roles ROLES [ROLES ...]
                        Target roles of the nodes.
[root@fuel ~]# fuel2 non-existing
fuel2: 'non-existing' is not a fuel2 command. See 'fuel2 --help'.
Did you mean one of these?
  fuel-version
[root@fuel ~]# fuel2 non-existing --help
Unknown command ['non-existing']

As for the '--version' option as far as I can see the problem is in cliff itself and doesn't related to python-fuelclient directly. Because I install the latest demo from cliff and here is the result http://paste.openstack.org/show/586352/

Reviewed: https://review.openstack.org/388636
Committed: https://git.openstack.org/cgit/openstack/python-fuelclient/commit/?id=169dda2d6b5830fc4af343645e6734061dc4648b
Submitter: Jenkins
Branch: master

commit 169dda2d6b5830fc4af343645e6734061dc4648b
Author: tivaliy <email address hidden>
Date: Wed Oct 19 14:20:04 2016 +0300

    Make help message more accurate and user-friendly

    Now in python-fuelclient if we try to get help message
    for specific command with '--help' option, e.g.:

          fuel2 node list --help

    the output result looks very ugly, because it prints
    all available commands in fuel2 instead of detailed
    description for exact command. Also we have similar
    behavior if we try to specify non-existing command.
    This patch makes help message more accurate and
    user-friendly, e.g.:

          #fuel2 env add nodes --help

    usage: fuel2 env add nodes [-h] -e ENV -n NODES [NODES ...]
                               -r ROLES [ROLES ...]

    Adds nodes to an environment with the specified roles.

    optional arguments:
      -h, --help show this help message and exit
      -e ENV, --env ENV Id of the environment to add nodes to
      -n NODES [NODES ...], --nodes NODES [NODES ...]
                            Ids of the nodes to add.
      -r ROLES [ROLES ...], --roles ROLES [ROLES ...]
                            Target roles of the nodes.

         #fuel2 non-existing --help

    Unknown command ['non-existing']

    Change-Id: I89afb39d92ffb01c37fbf558e6d62091ac6112e7
    Partial-Bug: 1629285

Looks like the bug is not in progress for two months.