[yocto] Package Level Dependencies

[Philip Balister]

On 02/22/2016 08:00 AM, sebastian.rohde at tu-dortmund.de wrote:
> Hi Rudolf,
> 
> Thnx for your input! I guess I can see your point. In particular I wasn't thinking so much on using ".inc" files.
> Due to the fact that I will be having like 10-20 different test123-config-xxx packages managing this using "RCONFLICTS" might be tedious.
> I guess this is what virtual packages (say test123-config-xxx has something like PROVIDES=virtual/test123-config and test123 has a RDEPENDS on virtual/test123-config) are for and I will try to follow this path for now.
> 
> For a couple of reasons, the configuration files are in the same git repository as the source code of "test123". Is there a way of sharing working directories between (at least all config-package recipes, such as I don't net to checkout the whole git repository for each of my 10-20 config packages?

Would selecting the conf file with a MACHINE override help here?

Philip

> 
> Regards,
> Sebastian
> 
> -----Ursprüngliche Nachricht-----
> Von: Rudolf J Streif [mailto:rudolf.streif at gmail.com]
> Gesendet: Montag, 22. Februar 2016 02:38
> An: yocto at yoctoproject.org
> Cc: Rohde, Sebastian <sebastian.rohde at tu-dortmund.de>
> Betreff: Re: [yocto] Package Level Dependencies
> 
> Hi Sebastian,
> 
>> I have a recipe (say: "test123") that provides a complex piece of
>> software (cmake-based). The software needs some configuration file
>> (say "test123.conf"). There are multiple variants of the configuration
>> file, sharing the same name, i.e. "test123.conf" exists in different
>> variants for multiple hardware configurations.
>>
>> My aim would be to have multiple packages like "test123-config-XXX"
>> and "test123-config-YYY", that cannot be installed at the same time,
>> while having one of the packages is a dependency for the main package "test123".
> 
> These are two conflicting packages.
> 
>>
>> Is there a way to achieve this? From my current understanding,
>> dependencies are "per-recipe" and not "per-package". Is there any way
>> to achieve package level dependencies? I would like to avoid having
>> multiple recipes as there are many configuration file options which
>> are currently located in the same large source repository as the main software.
> 
> Look at it from the perspective of conflicting packages.
> 
> My approach to this would be the following:
> 
> 1. Write an include file test123.inc that includes all of the guts of your recipe.
> 
> 2. Write the two recipes test123-config-XXX_1.0.bb and test123-config-
> YYY_1.0.bb:
> 
> test123-config-XXX_1.0.bb
> 
> require test123.inc
> 
> SRC_URI += "test123-XXX.conf"
> 
> do_install_append() {
>    # install config file here
>    install 544 test123-XXX.conf ${D}/<location> }
> 
> RCONFLICTS_${PN} = "test123-config-YYY"
> 
> Analog for test123-config-YYY_1.0.bb
> 
> 
> You are essentially sharing all of the recipe through the test123.inc and only add the config file to the respective target recipe. The RCONFLICTS_${PN} directive will flag an error if both conflicting packages are attempted to be installed.
> 
> BR,
> Rudi
> 
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