[OE-core] [PATCH 1/1] sstate.bbclass: fix parallel building issue

[Mark Hatle]

On 8/15/13 11:23 AM, Richard Purdie wrote:
> On Thu, 2013-08-15 at 10:55 +0100, Phil Blundell wrote:
>> On Thu, 2013-08-15 at 17:51 +0800, Rongqing Li wrote:
>>> OK, But your issue is not related to me.
>>>
>>> I can reproduce my issue by two simple script.
>>
>> If tar is deciding that the file has "changed" just because the link
>> count on the dentry has increased, that sounds like it is probably a bug
>> in tar and ought to be fixed there.
>>
>> That said, I can't immediately think why autotools_copy_aclocal couldn't
>> use a symlink rather than a hard link which would avoid this whole
>> problem.  If the file is in the sysroot then there should be no risk of
>> it going away underneath its user.
>
> Sadly this doesn't work. We block copy a set of .m4 files from the
> sysroot. We can be running do_configure of package A whilst package B is
> de-installed from the sysroot and this leads to files disappearing
> whilst they're being accessed. Its turned out to be a really awkward
> problem to fix.

Do we need some kind of a read/write lock on accessing those files.  (Is this 
even something that we can do easily though the existing mechanisms?)

--Mark

> Cheers,
>
> Richard
>
>
>
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