[yocto] Installing Python app from source

[Shantanoo Desai]

Hi Brian,

 

It is confusing, I agree. But I think it is essential because I assume your Target is not connected to the Internet. When you do pip install <package> normally the package if fetched from the internet and then installed. In this case your app is local so need to have those files first built natively and then need to be sent to the appropriate folders for python to access them which I guess what setuptools does. Hence you set all the files in the SRC_URI. 

 

Do_install_append is only when you have binaries which could be used as command line utilities. 


(But I could also be completely wrong, not a Yocto guru here)

 

Cheers

 

Shan

 

Von: Brian Zambrano <brianz at gmail.com> 
Gesendet: Donnerstag, 4. Oktober 2018 18:33
An: desai at uni-bremen.de
Cc: yocto at yoctoproject.org
Betreff: Re: [yocto] Installing Python app from source

 

Thanks very much for this Shan. I have that book and was working through it yesterday, as a matter of fact.

 

That part which is confusing to me in that recipe is that the SRC_URI points to every single file, there is a "inherit setuptools" line and also a do_install_append. I'm not sure how each of these are working together to get the application installed. I believe that the "inherit setuptools" will automatically run "python setup.py install", but when then is the source code manually copied over?

 

BZ

 

On Thu, Oct 4, 2018 at 2:13 AM Shantanoo Desai <desai at uni-bremen.de <mailto:desai at uni-bremen.de> > wrote:

Hi Brian,

 

What you need in the .bb is a runtime-dependency. RDEPENDS_${PN} += “ ${PYTHON_PN}-flask ${PYTHON_PN}-jinja ${PYTHON_PN}-markdown” and so on. This will add these modules in the root-filesystem and will be available on the target. 

 

If you need some basic help with a python recipe, there is a git repository YoctoCookbook https://github.com/yoctocookbook/meta-custom/tree/master/recipes-python/python-helloworld to get you some idea.

 

Please not I am in no ways a Yocto expert on recipe creations but for the past few weeks this is what I have been able to discover. Due to lack of examples on custom recipes in python this is the best I can help you with.

 

 

Best Regards,

 

Shan

 

 

 

Von: yocto-bounces at yoctoproject.org <mailto:yocto-bounces at yoctoproject.org>  <yocto-bounces at yoctoproject.org <mailto:yocto-bounces at yoctoproject.org> > Im Auftrag von Brian Zambrano
Gesendet: Donnerstag, 4. Oktober 2018 00:52
An: yocto at yoctoproject.org <mailto:yocto at yoctoproject.org> 
Betreff: [yocto] Installing Python app from source

 

I'm trying to install my own Python application from source, and having a hard time finding resources on how to accomplish it. I'm new to this ecosystem and am probably missing something fundamental.

My recipe is structured like this...and my build is configure such that it does actually find it.

├── firmware-1.0
│   ├── saunders_backend
│   └── saunders_frontend

└── firmware_1.0.bb <http://firmware_1.0.bb> 

My application code which is for now just a "hello world" flask application, is in saunders_backend. The setup.py file in there works as expected when I use it in on my host machine.

├── firmware-1.0
│   ├── saunders_backend/
│   │   ├── bin/
│   │   │   └── server
│   │   ├── MANIFEST.in
│   │   ├── requirements.txt
│   │   ├── saunders_apollo/
│   │   │   ├── config.py
│   │   │   ├── __init__.py
│   │   │   ├── models.py
│   │   │   ├── static/
│   │   │   ├── templates/
│   │   │   └── views.py
│   │   └── setup.py

│   └── saunders_frontend/
└── firmware_1.0.bb <http://firmware_1.0.bb> 


I've been hacking on the .bb files to get it to install this into the resulting image. I do have IMAGE_INSTALL_append = " firmware" in the top-level local.conf.

 

My primary confusion is that I don't know what I should be using for the python application. do_install, do_install_append? What should SRC_UIR be? In effect is that I want the exact same behavior of "cd saunders_backend && pip install ." My setup.py file has install_requires with a list of all dependencies, which now is merely Flask.

 

Pointers would be appreciated.

BZ

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