[OE-core] [PATCH V2 1/1] bitbake-layers: add a ability to query layer dependencies from layer index

[Chong Lu]

On 01/15/2015 10:20 PM, Paul Eggleton wrote:
> Hi Chong,
>
> On Monday 12 January 2015 14:48:42 Chong Lu wrote:
>> It maybe depends on other layers when one layer is added to BBLAYERS. If
>> define LAYERDEPENDS variable in this layer, we will get error from bitbake.
>> But sometimes, we don't have defined. Add a mechanism to extend
>> bitbake-layers and it will query layer dependencies from layer index
>> (http://layers.openembedded.org/layerindex/api/)
>> Use `bitbake-layers show-layer-dependencies' to find out dependencies and
>> update bblayers.conf as appropriate.
> OK, so this is actually a patch against bitbake and thus should be sent to the
> bitbake mailing list instead.
>
> Having said that, I have looked over the code. This is definitely a step in the
> right direction, however I would make the following comments:
>
> 1) Since this is for bitbake we can't really have hardcoded references to the
> OE layer index in the code. I'd suggest we have bitbake-layers query a
> variable e.g. BITBAKE_LAYERINDEX_URL, and then separately patch OE to set that
> from conf/bitbake.conf. (It should also give a sensible error if the variable
> isn't set for some reason.)
>
> 2) I think this could be a bit more practical in terms of usage. As described
> in the bug I was thinking of a command for which you would specify the name of
> a layer you wanted to use, and then bitbake-layers would call the layer index,
> find the specified layer and all of its dependencies, fetch them, then add them
> to bblayers.conf. This kind of does the first part but leaves the rest to the
> user - I think we can go a bit further than that. FWIW as you may have seen I
> did just add some code to make clean modifications to bblayers.conf which may
> be useful for part of this.
>
> For #2 there may be a slight problem to solve, which is that whatever
> equivalent of OE-Core you have on your local disk needs to be considered
> equivalent to the "oe-core" layer in the layer index so you don't end up
> adding that. Toaster has solved this same issue, but in a way that won't work
> here, so we might have to figure out an alternative solution.
>
> Cheers,
> Paul
>

OK. I will modify this and resend one to bitbake mail list.

Best Regards
Chong