[Pulp-list] package group explanation

[Salvatore Di nardo]

hello,
i have a little problem creating package groups, and i hope someone will 
be able to help me.

I followed this procedure: 
https://pulp-rpm-user-guide.readthedocs.org/en/pulp-2.3/recipes.html#package-groups 
and succeeded to create one:

    pulp-admin rpm repo uploads group \
      --user-visible=true \
      --repo-id=rhel-ebi-package-groups \
      --group-id=package-group-gpfs-client-4.1.0-8 \
      --name="Package Group for GPFS 4.1.0-8 clients" \
      --description="Package Group for GPFS 4.1.0-8 clients" \
      --mand-name=gpfs.docs \
      --mand-name=gpfs.gpl \
      --mand-name=gpfs.msg.en_US \
      --mand-name=gpfs.base \
      --mand-name=gpfs.gskit \
      --mand-name=gpfs.ext

and i can see that the package group its in the repo:

    [root at hx-syr-01 repodata]# pulp-admin rpm repo content group
    --repo-id rhel-ebi-package-groups
    Conditional Package Names:
    Default Package Names:     None
    Description:               Package Group for GPFS 4.1.0-8 clients
    Id:                        package-group-gpfs-client-4.1.0-8
    Mandatory Package Names:   gpfs.docs, gpfs.gpl, gpfs.msg.en_US,
    gpfs.base,
                                gpfs.gskit, gpfs.ext
    Name:                      Package Group for GPFS 4.1.0-8 clients
    Optional Package Names:    None
    User Visible:              True

Now, when i go to the one client that's using the repo, i can see the repo:

      yum group list | grep -i gpfs
        Package Group for GPFS 4.1.0-8 clients

but when i try to install it:

    yum group install package-group-gpfs-client-4.1.0-8
    Loaded plugins: langpacks, product-id, subscription-manager
    This system is not registered to Red Hat Subscription Management.
    You can use subscription-manager to register.
    *Warning: Group package-group-gpfs-client-4.1.0-8 does not have any
    packages to install.*
    Maybe run: yum groups mark install (see man yum)
    No packages in any requested group available to install or update


It seems to me that i created a package group, but have not defined what 
package are included to the group. Maybe i just misunderstood that the 
"--mand-name" does. In that case what it does, and how can i add/remove 
packages from a specific package group? Oddly enough the documentation 
says nothing about package management in a package group ( how 
add/remove packages from a package group). ^_^''

thanks in advance,
Salvatore


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