When running complex test scenarios in Lago one of the tasks that frequently needs to be done, is manipulation of the YUM repository configuration for guests. Some common manipulations are:

• Adding a local repositoy created with lago ovirt reposetup.
• Ensuring that guests only use a controlled set of repos
• Injection yum settings to guests, like enforcing the usage of a proxy server.

Right now these task are typically done by means of the deploy script or by using a mix of lago shell and lago copy-to-vm commands.

It is desirable to have higher-level Lago commands to allow such manipulations. I suggest all such commands be implemented inside a yumconfig plugin. Here is a detailed description of commands:

• lago yumconfig inject [--strip-excludes] <vm_name> <yum.conf_name> - Inject the given full yum configuration to a vm, Overriding all other configuration. --strip-excludes strips yum exclude directives from configuration before adding.
• lago yumconfig add [--strip-excludes] [--set-exclusive] <vm_name> <yum.conf_name> - Add the given yum configuration to the guest existing configuration. --strip-excludes is like in inject. --set-exclusive insures that all packages that are included in the added repos are excluded from all the guest pre-existing repos.
• lago yumconfig inject-local-repo [--strip-excludes] <vm_name> - Replace all guest yum configuration with a configuration that only includes the local repository created with lago ovirt reposetup.
• lago yumconfig add-local-repo [--strip-excludes] [--set-exclusive] <vm_name> - Add local repository created with lago ovirt reposetup to guest existing configuration.
• lago yumconfig inject-host-config, lago yumconfig add-host-config - Add or inject yum configuration from the host Lago is currently running on.