[yocto] Hob - proper way to select machine and customer layers

[jfabernathy]

On 06/22/2012 07:17 AM, Paul Eggleton wrote:
> On Thursday 21 June 2012 14:39:30 jfabernathy wrote:
>> On 06/21/2012 10:49 AM, jfabernathy wrote:
>>> To use Hob, I set my environment variable and the just ran hob.  It
>>> was very slow going through the first 63 packages. I think this is
>>> because parallel options had not been set and the packages were all
>>> being downloaded again.
> You're referring to the initial pseudo build here I presume?
Yes.
>>> But after I got to the UI of hob, I got
>>> errors adding my layers to get to the meta-intel layers I wanted.  So
>>> I started over and edited local.conf and bblayer.conf prior to
>>> launching hob.  Now I could see my machine from meta-intel, but I
>>> could not add my layer in. Parsing errors.
> By parsing errors it would help if you were more specific. Do you mean the
> following?
>
> ERROR: Unable to parse /home/paul/poky/meta-intel/meta-
> cedartrail/conf/layer.conf: Failure expanding variable BBPATH, expression was
> ${BBPATH}:/home/paul/poky/meta-intel which triggered exception Exception:
> variable BBPATH references itself!
ERROR: Unable to parse /home/jim/poky/meta-hob/conf/layer.conf:
Failure expanding variable BBPATH, expression was
$(BBPATH):/home/jim/meta-jfa:/home/jim/poky/meta
which triggered exception Exception: variable BBPATH
references itself!
>>> Before I report an error, I wanted to see if I have the hob startup
>>> process right. The issues is around the right way to add
>>> meta-intel/meta-cedartrail and my personal layer in my home directory.
>>>
>>> Any advice?
>>>
>>> JIm A
>> My experimenting tells me that currently Hob (denzil) only work with new
>> added layers that are in the poky directory and not in your home
>> directory.  This is a different requirement than normal command line
>> usage of bitbake.
> Assuming the error you're seeing is the one above, I don't think that's the
> problem - the problem AFAICT is that the order of the layers hob is using is
> not the same as the order in which it displays them, and the order it uses is
> not compatible with the old method of setting BBPATH which meta-intel and its
> sub-layers use, which is 'BBPATH := "${BBPATH} /extra/path/to/add"' - if
> BBPATH is not already set as it would not be if this is the first layer in the
> list, then it is unable to expand BBPATH and you get this failure. You can
> reproduce this outside of hob just by reordering the entries in bblayers.conf.
>
> So there are a few issues highlighted here:
>
> 1) Hob is re-ordering the layer list and it definitely shouldn't be. I've filed
> bug #2649 to get this fixed.
>
> 2) We really ought to go through and fix the BBPATH setting for all layers to
> not use the old method of appending to it.
>
> 3) It may be useful for people to be able to change the order of layers in the
> layer list within hob, particularly for situations where class/conf files are
> overlayed (which is to be avoided, but does occur).
>
> Cheers,
> Paul
>
Seems that you understand the problem :-)

Jim A