TMT: get specific info about virtual provisioner using --help

tmt_virtual_help.txt

$ tmt -c distro=fedora-rawhide run -vv --all provision -h virtual --help -i fedora:rawhide plans --default

Usage: tmt run provision [OPTIONS]

  Local virtual machine using testcloud library.

  Minimal config which uses the latest Fedora image:

      provision:
          how: virtual

  Here's a full config example:

      provision:
          how: virtual
          image: fedora
          user: root
          memory: 2048

  As the image use fedora for the latest released Fedora compose,
  fedora-rawhide for the latest Rawhide compose, short aliases such as
  fedora-32, f-32 or f32 for specific release or a full url to
  the qcow2 image for example from https://kojipkgs.fedoraproject.org/compose/.
  Short names are also provided for centos, centos-stream, alma,
  rocky, oracle, debian and ubuntu (e.g. centos-8 or c8).

  NOTE: The non-rpm distros are not fully supported yet in tmt as
  the package installation is performed solely using dnf/yum
  and rpm.
  But you should be able the login to the provisioned guest and start
  experimenting. Full support is coming in the future :)

  Supported Fedora CoreOS images are:

  * fedora-coreos
  * fedora-coreos-stable
  * fedora-coreos-testing
  * fedora-coreos-next

  Use the full path for images stored on local disk, for example:

      /var/tmp/images/Fedora-Cloud-Base-31-1.9.x86_64.qcow2

  In addition to the qcow2 format, Vagrant boxes can be used as well,
  testcloud will take care of unpacking the image for you.

Options:
  -h, --how METHOD                Use specified method for provisioning.
  --insert                        Add this phase instead of overwriting the
                                  existing ones.
  --update                        Update existing phase. Use --name to
                                  specify which one, or omit --name and
                                  update all existing phases.
  --update-missing                Update existing phase, but make changes to
                                  fields that were not set by fmf data or
                                  previous command line options. Use --name
                                  to specify which one, or omit --name and
                                  update all existing phases.
  --allowed-how PATTERN           If set, only how matching given
                                  regular expression is allowed.
  --name TEXT                     Name of the existing phase which should be
                                  updated when '--update' is used.
  --order INTEGER                 Order in which the phase should be handled.
  --role ROLE                     Marks related guests so that common actions
                                  can be applied to all such guests at once.
  --hardware KEY=VALUE            Add a hardware requirement.
  -b, --become                    Whether to run shell scripts in tests,
                                  prepare, and finish with sudo.
  -P, --port PORT                 Use specific port to connect to.
  -u, --user USERNAME             Username to use for all guest operations.
  -k, --key PATH                  Private key for login into the guest
                                  system.
  -p, --password PASSWORD         Password for login into the guest system.
  --ssh-option OPTION             Specify an additional SSH option. Value is
                                  passed to SSH's -o option, see
                                  ssh_config(5) for supported options. Can be
                                  specified multiple times.
  -i, --image IMAGE               Select image to be used. Provide a short
                                  name, full path to a local file or a
                                  complete url.
  -m, --memory SIZE               Set available memory in MB, 2048 MB by
                                  default.
  -D, --disk SIZE                 Specify disk size in GB, 10 GB by default.
  -c, --connection session|system
                                  What session type to use, 'session' by
                                  default.
  -a, --arch x86_64|aarch64|s390x|ppc64le
                                  What architecture to virtualize, host arch
                                  by default.
  --list-local-images             List locally available images.
  -v, --verbose                   Show more details. Use multiple times to
                                  raise verbosity.
  -d, --debug                     Provide debugging information. Repeat to
                                  see more details.
  -q, --quiet                     Be quiet. Exit code is just enough for me.
  --log-topic key-normalization|cli-invocations|command-events|adjust-decisions|help-rendering
                                  If specified, --debug and --verbose would
                                  emit logs also for these topics.
  -f, --force                     Overwrite existing files and step data.
  -n, --dry                       Run in dry mode. No changes, please.
  --again                         Run again, even if already done before.
  --feeling-safe                  WARNING: with this option, tmt would be
                                  allowed to make potentially dangerous
                                  actions. For example, some metadata keys
                                  may cause scripts being executed on the
                                  runner. Do not use this option unless you
                                  trust metadata consumed by tmt, or unless
                                  you know what you are doing.
  --help                          Show this message and exit.