[JIRA] (OVIRT-921) Smarter cache handling for mock_runner.sh

[Barak Korren (oVirt JIRA)]

Barak Korren created OVIRT-921:
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             Summary: Smarter cache handling for mock_runner.sh
                 Key: OVIRT-921
                 URL: https://ovirt-jira.atlassian.net/browse/OVIRT-921
             Project: oVirt - virtualization made easy
          Issue Type: Improvement
          Components: Jenkins
            Reporter: Barak Korren
            Assignee: infra


We've improved our handing of mock caches in OVIRT-902, but it could be better.

Right now we're just deleting everything from {{mock_cleanup.sh}} every two days, but we could do things in a smarter and more refined way:

* Mock actually has two separate caches that could be handled separately:
*# The yum cache - Caches package that are installed in the chroot 
*# The root cache - Keeps an archive of the whole chroot
* We can make the yum cache shared by all the chroots that use the same repos
* We can keep the yum cache for much longer since 'yum' will refresh it automatically. We can tune this from mock root config file:
** {{config_opts\['plugin_conf']\['yum_cache_opts']\['max_age_days']}}
** {{config_opts\['plugin_conf']\['yum_cache_opts']\['max_metadata_age_days']}}
* We can also control the chroot cache from the mock config file, this will allow us greated flexibility, like deciding that some chroots live longer:
** {{config_opts\['plugin_conf']\['root_cache_opts']\['max_age_days']}}
* We can use a different compression algorithm for the chroot acche, this may yield better performance.
* We still need some cleanup in {{moch_cleanup.sh}} but only for chroot caches that ahvn't been in use for a long time.



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