Slavi Pantaleev d2c9ed3e45 Initial work on optimization commands ...

The playbook can now optimize itself based on the enabled components in
for all hosts in the inventory (`just optimize`) or for a specific host
(`just optimize-for-host HOSTNAME`).

The optimized playbook will have:

- fewer requirements (fewer roles need to be installed by `just roles`)
- a shorter and quicker to evaluate `group_vars/mash_servers` file
- a `setup.yml` file which includes less roles

Running the playbook optimized is still work in progress.
There still probably exist various role dependencies in the group-vars file, etc.

The `optimize-reset` command aims to restore your playbook to a
non-optimized state, which should work as before (and not experience bugs).

The playbook takes care to notice of changes to the various files in
`templates/` (`setup.yml`, `requirements.yml`, `group_vars_mash_servers`)
and update your optimized or non-optimized copies that are derived from
these templates. To do this, it keeps `.srchash` files in the `run/` directory.
When it notices a change in the source file's hash (by comparing to the `.srchash` file),
it will update you to the new template.

Optimization state is stored in a file in `run/` as well (`optimization-vars-files.state`).
Should the playbook notice changes in the source `template/` files, it
should update you and re-optimize using the same parameters as before (read from the state file).

2023-11-20 16:29:06 +02:00

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