[yocto] Package Level Dependencies

[sebastian.rohde at tu-dortmund.de]

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?

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

Wichtiger Hinweis: Die Information in dieser E-Mail ist vertraulich. Sie ist ausschließlich für den Adressaten bestimmt. Sollten Sie nicht der für diese E-Mail bestimmte Adressat sein, unterrichten Sie bitte den Absender und vernichten Sie diese Mail. Vielen Dank.
Unbeschadet der Korrespondenz per E-Mail, sind unsere Erklärungen ausschließlich final rechtsverbindlich, wenn sie in herkömmlicher Schriftform (mit eigenhändiger Unterschrift) oder durch Übermittlung eines solchen Schriftstücks per Telefax erfolgen.

Important note: The information included in this e-mail is confidential. It is solely intended for the recipient. If you are not the intended recipient of this e-mail please contact the sender and delete this message. Thank you. Without prejudice of e-mail correspondence, our statements are only legally binding when they are made in the conventional written form (with personal signature) or when such documents are sent by fax.