[oe] Use python in variable assigment of a recipe

[Steffen Sledz]

On 28.02.2012 10:55, Paul Eggleton wrote:
> On Tuesday 28 February 2012 10:26:16 Steffen Sledz wrote:
>> According to the user manual it is possible to use python code in variable
>> assignments by using ${@...}.
>>
>> I like to use a function (subprocess.check_output) here which requires an
>> import statement. Where do i have to place this import?
> 
> If you've got more than one line of Python then you should probably define a 
> normal Python function (just use "def" as you would in a normal python script 
> - there are plenty of examples of this) and then call this using ${@...}.

Works. Thx.

>> And another question. Is it possible to determine the path to the recipe
>> itself from with it?
> 
> I think you just need to get the value of the FILE variable e.g
> 
>  d.getVar('FILE', True)

Because i'm working with oe-classic i tried this (found in some other examples):

  MYVAR = "${@my_func()}"

  def my_func():
      bbpath = os.path.dirname(bb.data.getVar('FILE',d,1))
      ...

But this leads to an error:

  NameError: global name 'd' is not defined

:(

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