[azure] DataSourceAzure default config should be overridable with files in /etc/cloud.cfg.d/

[Paul Meyer]

The Azure datasource has some hardcoded defaults for ephemeral disk mounting that can be overridden with cloud-config from userdata. However, we also need the ability to override the defaults for other distros/images, e.g. to mount on /mnt/resource by default (possibly overridden by userdata).
The proper way to provide defaults for an image would be to drop files in /etc/cloud/cloud.cfg.d/. However, since datasource config overrides local configuration, the local configuration is always ignored.
A possible solution might be a datasource config value that decides whether or not to add default configuration when the datasource loads.

[n00ris (jb-faq)]

Hello, is it maybe related to
https://bugs.launchpad.net/cloud-init/+bug/1374115
?

[James Falcon (falcojr)]

Yes, thank you. This appears to be a duplicate of #1374115. I will mark it as such.

[James Falcon (falcojr)]

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/3072