[yocto] extrausers working from image file .bb but not from .bbappend

[Paul Eggleton]

On Wednesday 22 April 2015 07:00:50 Chris Morgan wrote:
> On Wed, Apr 22, 2015 at 4:10 AM, Paul Eggleton
> 
> <paul.eggleton at linux.intel.com> wrote:
> > On Tuesday 21 April 2015 18:54:29 Khem Raj wrote:
> >> Hi Chris
> >> 
> >> > On Apr 21, 2015, at 6:27 PM, Chris Morgan <chmorgan at gmail.com> wrote:
> >> > 
> >> > Hello.
> >> > 
> >> > Based on
> >> > http://www.yoctoproject.org/docs/current/ref-manual/ref-manual.html#ref
> >> > -c
> >> > lasses-extrausers and the .bbclass file I've added this to a .bbappend,
> >> > pulseaudio_%.bbappend actually so root user can use pactl when
> >> > pulseaudio is running in system mode:
> >> > 
> >> > inherit extrausers
> >> > EXTRA_USERS_PARAMS = "\
> >> > 
> >> >        usermod -a -G audio root \
> >> > 
> >> > "
> >> > 
> >> > 
> >> > From the .bbappend this isn't working. If instead I add it to our
> >> > custom image file recipe (image-blah.bb) it does work.
> >> 
> >> its a image level config so thats right behavior.
> >> 
> >> > I'm not sure how to debug or why it isn't working from the .bbappend.
> >> > Thoughts?
> >> > 
> >> > 
> >> > 
> >> > Also, the documentation in the .bbclass seems out of date but wanted to
> >> > confirm:
> >> > 
> >> > http://git.yoctoproject.org/cgit.cgi/poky/plain/meta/classes/extrausers
> >> > .bb
> >> > class
> >> > 
> >> > shows:
> >> > 
> >> > Below is an example showing how to use this functionality.
> >> > # INHERIT += "extrausers"
> >> > # EXTRA_USERS_PARAMS = "\
> >> > # useradd -p '' tester; \
> >> > # groupadd developers; \
> >> > # userdel nobody; \
> >> > # groupdel -g video; \
> >> > # groupmod -g 1020 developers; \
> >> > # usermod -s /bin/sh tester; \
> >> > # "
> >> > 
> >> > This INHERIT vs. inherit seems like it could be something that changed
> >> > in bitbake in the past but was left over in the .bbclass.
> >> 
> >> its correct because its assuming you are adding it to config metadata and
> >> not recipe metadata may be location is not right. Send a patch
> > 
> > It should work either in the image recipe (with inherit) or at the
> > configuration level (with INHERIT +=), but I agree extrausers not intended
> > to work from individual recipes, we have useradd for that.
> 
> Looked at useradd source and documentation and skeleton example but I
> don't see a way to add another specific user to a group.
> 
> I had been looking to use extrausers with 'usermod' in the
> pulseaudio_%.bbappend because the pulseaudio.inc base recipe file is
> the one creating the 'audio' group and adding the 'pulse' user to it.
> So it seemed like an appropriate recipe to add to to also add root to
> the 'audio' group.
> 
> Am I missing some way of doing this with useradd or should I just be
> modifying the top level image recipe to resolve this issue?

I don't believe useradd.bbclass can be used to solve this, no. You probably 
need to use extrausers.bbclass from the image recipe.

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre