Oftentimes, we want to simulate a specific behavior of the application
when running in dry-run mode. To do so, we use either command line
parameters or environment variables.
This patch introduces a configuration object for dry-run executions
only. The object can be automatically loaded from a JSON file specified
via the --dry-run-config CLI argument.
Such a configuration object should help us cover way more test cases.
Going forward, I would like to use this object for things like:
* drivers - to instruct Subiquity what third-party drivers it should
suggest ; or if Subiquity should run ubuntu-drivers on the host
instead.
* ubuntu-pro - to specify the ua-contracts test environment URL - or
predefined automatic replies for the server
* to assume that /var/lib/snapd/seed/systems directory exists on the
source (or not).
* to specify the Ubuntu release that is returned by lsb_release ; can
be used to test behavior on LTS vs non LTS releases.
*
* ...
Signed-off-by: Olivier Gayot <olivier.gayot@canonical.com>
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