[OE-core] [PATCH 1/1] oe/copy_buildsystem.py: dereference symlink

[Robert Yang]

On 11/01/2016 06:09 PM, Richard Purdie wrote:
> On Mon, 2016-10-31 at 08:48 -0700, Robert Yang wrote:
>> When there is a relative symlink in the layer, for example:
>> symA -> ../out/of/layer/file
>>
>> symA will be invalid fater copied, it would be invalid from build
>> time
>> if it points to a relative path, and would be invalid after extracted
>> the sdk if it points to a absolute py. Dereference symlink when copy
>> will fix the problem.
>>
>> Use tar rather than shutil.copytree() to copy is because:
>> 1) shutil.copytree(symlinks=Fasle) has bugs when dereference
>> symlinks:
>>    https://bugs.python.org/issue21697
>>    And Ubunutu 1404 doesn't upgrade python3 to fix the problem.
>>
>> 2) shutil.copytree(symlinks=False) raises errors when there is a
>> invalid
>>    symlink, and tar just prints a warning, tar is preferred here
>> since
>>    the real world is unpredicatable
>>
>> 3) tar is faster than shutil.copytree() as said by oe.path.copytree()
>
> Could we just use oe.path.copytree() here?

I should explain why not use oe.path.copytree(), but it was late last
night, so I forgot that. We can't use oe.path.copytree() since:
1) oe.path.copytree() doesn't dereference symlink
2) We need --exclude='.git'

I'd like to add two arguments to oe.path.copytree() to do this if it is worth.

// Robert

>
> Cheers,
>
> Richard
>