[sane-devel] Fix PPA build

[Rolf Bensch]

Hi James,

Am 08.05.2017 um 22:22 schrieb James Duvall:
> Rolf,
> 
> Thanks for getting your ppa back up and running.  However, I am not able
> to install the libsane package using apt, even when I try to force the
> version.  I believe that your new version numbering with ~ is causing
> the problem.
> 
> ver=1.0.26~ppa20170508-yakkety0; sudo apt-get install libsane=$ver
> libsane-common=$versane-utils=$ver
> 

I used synaptic for Trusty and it's working.

You can use an alternative more complex procedure to get the updates
from my ppa:

(1) search for installed SANE packages:
$ dpkg -l *sane*

(2) purge all SANE packages with the version '1.0.26[-+]ppa{date}
*without* removing dependent packages:
$ sudo dpkg --force-all -P libsane libsane-common sane-utils [other
installed packages]

(3) reinstall SANE:
$ apt-get -f install

(4) reinstall all other removed packages, e.g.:
$ sudo apt-get install libsane-dev

> Apt complains that
> 
> The following packages have unmet dependencies:
>  libsane : Breaks: libsane-common (< 1.0.26)
>            Breaks: libsane-common:i386 (< 1.0.26)
> E: Unable to correct problems, you have held broken packages.
> 
> I think the issue is that version 1.0.26~ppa20170508-yakkety0 compares
> less than 1.0.26 due to special rules for handling ~ in version
> numbers.  The following shows this:
> 
> dpkg --compare-versions 1.0.26~ppa20170508-yakkety0 lt 1.0.26 && echo true
> true
> 

This is correct. SANE 1.0.26 isn't released yet.
Inspired from your comment I renamed the version in my ppa to
'1.0.26~pre{date}'. This makes it more transparent that this is a
pre-release.

> I created a local repository and re-packaged as version
> 1.0.26+ppa20170508-yakkety0 and was able to install with no problems, so
> maybe change the ~ for + or some other separator?  I am not experienced
> with debian package management, so please disregard if I am missing
> something.
> 

Then you'll get the next update after we started the development of SANE
version 1.0.27, then AKA version 1.0.27~pre{date} from my ppa repository

Many thanks for your report.

Hope this helps.

Cheers,
Rolf