allow to get only user set jail configuration

[gronke]

ioc get or ioc list print a mix of user provided defaults. It's important to differentiate between:

• system defaults
• user set global defaults
• jail configuration

Suggestion

Print all user defined properties

ioc get all --user <JAIL_GLOB>

Print all user defined defaults

ioc get all --user default

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[igalic]

this has always been the case

in puppet-jail, i used Set subtraction to figure out what's actually been changed. providing a way to out of ioc would be very convenient

[gronke]

@igalic we do even better than diffing: we know which settings are coming from the user and which are not.

• https://github.com/iocage/libiocage/blob/master/iocage/lib/Config/Jail/Defaults.py#L31
• https://github.com/iocage/libiocage/blob/master/iocage/lib/Config/Jail/BaseConfig.py#L401

Otherwise if the default is False and our user setting is False we would not recognize this to be explicitly set by the user.