[OE-core] [PATCH] bitbake: cooker: Ensure bbappends are found in stable order

[Peter Kjellerstedt]

> -----Original Message-----
> From: openembedded-core-bounces at lists.openembedded.org <openembedded-
> core-bounces at lists.openembedded.org> On Behalf Of Wes Lindauer
> Sent: den 28 augusti 2019 23:38
> To: openembedded-core at lists.openembedded.org
> Subject: [OE-core] [PATCH] bitbake: cooker: Ensure bbappends are found
> in stable order
> 
> Thanks to wildcards in bbappend filenames, it's possible to have
> multiple bbappends that apply to the same recipe in the same directory.
> In order to get sstate hits between different workspaces, we want to
> apply those bbappend files in a consistent order.  Since readdir()
> returns files in a non-deterministic order between workspaces (based on
> inode number and/or time of creation), we'll need to sort its result in
> order to have any consistency.
> 
> Signed-off-by: Wes Lindauer <wesley.lindauer at gmail.com>
> ---
>  bitbake/lib/bb/cooker.py | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/bitbake/lib/bb/cooker.py b/bitbake/lib/bb/cooker.py
> index 0607fcc708..a9ee142aa5 100644
> --- a/bitbake/lib/bb/cooker.py
> +++ b/bitbake/lib/bb/cooker.py
> @@ -1869,6 +1869,7 @@ class CookerCollectFiles(object):
>              (bbappend, filename) = b
>              if (bbappend == f) or ('%' in bbappend and bbappend.startswith(f[:bbappend.index('%')])):
>                  filelist.append(filename)
> +        filelist.sort()
>          return filelist
> 
>      def collection_priorities(self, pkgfns, d):
> --
> 2.14.5

I don't think this was a good idea at all. Before, bbappends were applied 
in the priority order of the layers, but this change throws the sorting 
based on priority out the window and might cause bbappend files for higher 
layers to be applied before lower layers' bbappend files.

Please revert this change, and rethink how to maintain a stable order for 
bbappend files from the same directory without affecting bbappend files 
from different layers.

//Peter