[yocto] Unable to modify patch files in u-boot recipe - quilt applies direct from layer files

[Khem Raj]

> On Nov 4, 2015, at 11:57 AM, Chris Hallinan <challinan at gmail.com> wrote:
> 
> Hi,
> 
> I was trying to "patch a patch" in a u-boot recipe using standard
> bbappends technique.  I added a task before do_patch after do_unpack
> to munge the patch that was broken.  Here is what seems to happen:
> 
> do_unpack:
>    copies all the patch files from the metadata layer into ${WORKDIR}
> 
> do_fix_patch (my additional task)
>    uses sed or patch to apply a local fix to a broken patch in ${WORKDIR}
> 
> do_patch
>    creates a subdirectory in ${S} called "patches", and puts links to
> the actual files in the layer and uses those links back to the layer
> files to apply the patches.
> 
> It seems quilt is using the actual layer files instead of the ones in
> ${WORKDIR}??
> 
> This seems odd and somehow wrong.  We copy the layer files into
> WORKDIR, and the unsuspecting user (me) thinks those are the files
> that do_patch will use.
> 
> This one took me some time (and help) to figure out!
> 
> Comments?  Is this a bug?  halfway in the middle of some architectural
> changes?  Expected behavior?

while what you are doing is quite questionable. You seem to have a point. Most probably
copy of the files in workdir should be removed from happening.

> 
> My workaround was to simply replace the entire patch.

you should use the quilt workflow and edit/refresh the patch once and copy it back to metadata once for all yes.

> 
> -Chris
> 
> --
> Life is like Linux - it never stands still.
> --
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