[avahi] Feature request: runtime modifiable servicedir

[Russell Senior]

On Fri, Apr 3, 2020 at 1:10 AM Trent Lloyd <trent at lloyd.id.au> wrote:

> Generally you would just the Avahi API to advertise your service instead
> of dynamically updating the “static” service files (which is what they are
> generally designed for - unchanging manual services).
>
> Is there something that prevents you from doing that? Or a reason you
> haven’t before now?
>

The service file approach is lean. The avahi-daemon we build is without
dbus support.


>
> You could also as a “hack” just launch an instance of the
> avahi-publish-service CLI tool.
>
> Trent
>
> On 3 Apr 2020, at 3:46 pm, Russell Senior <russell at personaltelco.net>
> wrote:
>
> 
> I have an application hosted on an OpenWrt version of avahi. In the land
> of OpenWrt, storage space is often on NOR flash, which is both scarce and
> limited in the number write cycles it can support. OpenWrt generally goes
> to considerable lengths to avoid often written files landing on flash,
> instead directing them to a tmpfs volatile filesystem.
>
> In my application, the service changes the advertised port number of over
> restart, and so the service file is different on every restart. I have a
> local hack that modifies avahi's Makefile.am to change the location of the
> service directory to the tmpfs. This is discussed briefly (see also my
> patch there) in this OpenWrt github issue:
> https://github.com/openwrt/packages/issues/11733
>
> I was encouraged to inquire here whether some suitable solution is
> acceptable in mainline avahi to allow runtime selection of servicedir so
> that we can use mainline avahi in OpenWrt without my hack.
>
> Thanks!
>
> --
> Russell Senior
> russell at personaltelco.net
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