add avahi file advertiser

[jneubrand]

♻️ Current situation

• the docker container requires host networking because homebridge wants to advertise its own service

💡 Proposed solution

• make it possible to publish zeroconf information via an avahi xml file, so that it can be mounted, example:

  volumes:
  - /etc/avahi/services/myhub-0000.service:/homebridge/myhub-0000.service

  (of course, this also requires changes in config.json as well as jneubrand/homebridge#94b2f53)
  once this is done, it's no longer necessary to expose host networking when using the docker homebridge image. (other relevant ports need to be exposed explicitly nonetheless)

⚙️ Release Notes

• add avahi-file advertiser

➕ Additional Information

• i've been using this patch for a few years and it works
• should probably allow users to configure the path the .service file is written to

Testing

• none implemented, just want to submit a proof-of-concept pr to check if anyone else wants this :)

Reviewer Nudging

this isn't ready to merge yet

[jneubrand]

Dear maintainers: do you have opinions on how the path for .service files should be configured/passed in? I saw createWithOptions for BonjourHAPAdvertiser as well as the responderOptions parameter for CiaoAdvertiser, but those never seem to be called from homebridge/homebridge itself.

[Supereg]

Hey,
Thank you for this contribution. This looks great and very promising for more isolated docker-based installations of Homebridge.
It will probably take some more time until we can have a more closer look at this. We hope to be back around end of March 👍

[NorthernMan54]

@jneubrand the GitHub repo docker-homebridge is where the docker image is built from, including the scripts etc. Would it make sense to open this there?

PS - I’m out of the country till mid March so can’t look at this till then.