[sane-devel] Fix PPA build

[Rolf Bensch]

Hi James,

I just found the problem in the build control file. Please test the
recent version from my ppa again.

Many thanks for your help.

Cheers,
Rolf

Am 09.05.2017 um 22:06 schrieb James Duvall:
> Rolf,
> 
> OK, now it makes more sense to me.  I saw that the last released version
> was 1.0.25, but I didn't fully comprehend that your ppa is a pre-release
> for 1.0.26.  When 1.0.26 is released, of course you would want these
> builds to compare earlier than the released version.
> 
> One thing I still don't fully comprehend.  libsane=1.0.26~preXXX depends
> on libsane-common=1.0.26~preXXX, but libsane=1.0.26~preXXX also breaks
> libsane-common<<1.0.26
> 
> This seems like a conflict.  Isn't this saying that libsane breaks the
> same version that it depends on?
> 
> Sorry if I am being frustrating or dense on this topic.  As I
> understand, apt and dpkg won't allow 2 different versions of the same
> package to be simultaneously installed.  If the pre-release libsane
> requires a specific version of libsane-common, doesn't that
> automatically imply that it breaks/conflicts with any other version? 
> libsane=1.0.26~preXXX will also break 1.0.27 or 1.1 or anything else
> that is released in the future, right?
> 
> Using your instructions, I still can't install using apt, dpkg.  I
> installed synaptic, but I get the same error and refusal to install (). 
> I am running yakkety, so maybe there is some difference from trusty.
> 
> However, this is not a big problem for me.  I am able to automatically
> build from the sane-backends package on your ppa, so I can test my
> MG5420 with the latest fixes.  I'll send another email once I have
> verified all functions and the scanbd script you sent me.
> 
> Many thanks,
> James
> On Tuesday, May 9, 2017 11:36 AM, Rolf Bensch <rolf at bensch-online.de> wrote:
> 
> 
> 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
> 
>