[oe] (no subject)

[Mark Asselstine]

On Friday, July 27, 2018 12:04:37 PM EDT William Delacre wrote:
> Thanks a lot for the answer, it worked perfectly !
> 
> There is just one point I don’t really understand : why do we need to add a
> dependency to ‘python-incremental-NATIVE’ ?
> 
> What would happen if I just add to the python-twisted recipe :
> 
> DEPENDS += “${PYTHON_PN}-incremental“

This would assume that python is completely arch independent, which it is not. 
Assume for example python-incremental had some C extensions, using DEPENDS 
would build them for the target arch yet possibly attempt to run them on your 
build host. -native takes care of this.

Some may say this is a bit of a hack since the difference in ARCH *might* 
equate to a difference in behavior. But I have dealt with many python recipes 
and have yet to run into any scenario where this potential issue exists.

At least that is what I can recall at the moment. Unfortunately I have 
forgotten some of the subtleties that might be in play.

Mark

> 
> William
> 
> Le ven. 27 juil. 2018 à 17:03, Mark Asselstine <
> 
> mark.asselstine at windriver.com> a écrit :
> > On Thu, Jul 26, 2018 at 3:40 PM, Mark Asselstine
> > 
> > <mark.asselstine at windriver.com> wrote:
> > > On Mon, Jul 23, 2018 at 8:28 AM, William Delacre
> > > 
> > > <williamdelacre at gmail.com> wrote:
> > >> Hi ! :-)
> > >> 
> > >> I’m facing issues when trying to run ‘bitbake python-twisted’
> > 
> > (do_compile
> > 
> > >> error)
> > >> 
> > >> Log says :
> > >> “Download error on https://pypi.python.org/simple/incremental/: [Errno
> > 
> > -3]
> > 
> > >> Temporary failure in name resolution
> > 
> > With the additional info you sent me along with a second look at the
> > error I can fairly confidently say I know what the issue is.
> > 
> > Python, like some other languages (ruby, go...) will attempt to
> > download dependencies/requirements if they are not present. This is
> > done "outside" of the bitbake system and thus will ignore
> > BB_NO_NETWORK and is generally a bad thing. It isn't quite host
> > contamination but it is very similar. What we do with our python
> > recipes in bitbake is review a python package's source setup.py,
> > requirements.txt...files in order to determine what other python
> > packages are needed, add them as RDEPENDS or similar in order to avoid
> > the python attempting to complete a download such as this.
> > 
> > In this case python-twisted 'requires' python-incremental but the
> > Rocko version of the python-twisted recipe lacks the needed assignment
> > to ensure this is available in the recipe sysroot and thus the
> > attempted download.
> > 
> > Cherry pick commit b08b570c8624303acbb6bb064a7bda466a679df4
> > [python-twisted: avoid downloading build dependencies] to Rocko and
> > you will be good to go. You should also follow up this thread with a
> > request to have this commit put onto Rocko to avoid others hitting the
> > same issue.
> > 
> > Mark
> > 
> > >> ............
> > >> 
> > >> distutils.errors.DistutilsError : Could not find suitable distribution
> > 
> > for
> > 
> > >> Requirement.parse(‘incremental>=16.10.1’)”
> > >> 
> > >> First of all I’m not connected to internet, so I’ve pre-downloaded all
> > 
> > the
> > 
> > >> required packages (twisted-17.9.0.tar.bz2 & incremental-17.5.0.tar.gz
> > 
> > are
> > 
> > >> present in my build/downloads folder)
> > >> 
> > >> It’s the first time I have some “downloading issues” and I’m stuck on
> > >> it
> > >> for a few hours now..
> > >> 
> > >> Any tips for me ?
> > > 
> > > Check all aspects of what you have manually downloaded and populated
> > > in your downloads. My guess is that a checksum or some other detail
> > > isn't matching and it is rejecting what you have and thus attempting
> > > to re-download the file.
> > > 
> > > Mark
> > > 
> > >> Thanks in advance !
> > >> --
> > >> _______________________________________________
> > >> Openembedded-devel mailing list
> > >> Openembedded-devel at lists.openembedded.org
> > >> http://lists.openembedded.org/mailman/listinfo/openembedded-devel