Re: Bug#989713: libsane1: add recommends on sane-airscan
On Sat 12 Jun 2021 at 11:47:25 +0800, Paul Wise wrote:
> Control: close -1
>
> On Fri, 2021-06-11 at 11:05 +0100, Brian Potkin wrote:
>
> > Does Bug #971658 provide some perspective?
>
> I see that requests the same change and it was rejected, closing.
>
> On Fri, 2021-06-11 at 09:22 +0200, Jonas Smedegaard wrote:
>
> > Please do not tie this to the sane1 library.
>
> That is the component that interfaces with sane backends so it seems
> like the right place to pull in other sane backends to me.
>
> > Using SANE without network is common even if not the "future" way, and
> > this relationship is better done at some metapackage closer to where the
> > bundling is intended.
>
> I think that for scanners that have USB connections, sane-airscan
> supports driverless scanning over USB by using ipp-usb, which is also
> the component that allows driverless printing over USB.
>
> > E.g. privacy-concerned users not using GNOME and not wanting Avahi
> > enabled would consider it an unpleasant surprise that a system upgrade
> > would auto-enable Avahi.
>
> sane-airscan itself does depend on avahi-daemon but it recommends the
> ipp-usb package, which does depend on avahi-daemon, but it seems
> strange to me that ipp-usb would need avahi.
IPP-over-USB effectively turns the device into a networked one using
IPP. Driverless printing and scanning require that there is a discovery
protocol to identify the device and obtain capability information from
it. This is achieved by having avahi-daemon expose the scanner on the
lo interface by default. DNS-SD does the rest.
Cheers,
Brian.
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