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Date: Fri, 6 Aug 2021 09:19:59 -0500
From: Patrick Williams <patrick@stwcx.xyz>
To: OpenBMC List <openbmc@lists.ozlabs.org>
Subject: Yocto override syntax change.
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Hello,

TL;DR: There is a required change to all meta-layers by Wednesday August 11,
2021 at 1PM UTC.  Any meta-layer not changed by that time may no longer com=
pile.



There is a major change to the upstream Yocto syntax that requires use to d=
o a
modification to the majority of our recipes and Yocto config files.  We wil=
l not
be able to perform another Yocto upgrade until this work is complete on our
part.

Yocto has an override syntax that is often used for machine and distro-spec=
ific
variable modification.  The previous syntax was something like:

    PACKAGECONFIG_append_machine =3D " pkgfeature"

This is being changed so that colons are used as override separators instea=
d of
underscores:

    PACKAGECONFIG:append:machine =3D " pkgfeature"

In the current bitbake we have in master there is support for both syntaxes,
because the code simply does a `s/:/_/` in variable processing, but the next
bitbake/Yocto pull will remove support for the underscore syntax and all us=
age
of it will be broken.  Again, until we make this change, we cannot pick up
Yocto updates because our current override syntax usage is no longer suppor=
ted.

Upstream has provided a script to help facilitate this transition but I am
finding that it does not catch every case and some additional help is neede=
d.

---- Fix-up procedure and tips ----

The helper script is in the `poky` repository at:
    scripts/contrib/convert-overrides.py

This can be obtained either by cloning or downloading directly:
    $ git clone git://git.yoctoproject.org/poky
    $ wget https://git.yoctoproject.org/cgit/cgit.cgi/poky/plain/scripts/co=
ntrib/convert-overrides.py

You may then run this on your meta-layer:
    $ path/to/convert-overrides.py meta-evb

After this, to find potential misses run the following grep:
    $ git grep "_[a-z0-9_/-]*[ :]" -- meta-evb

In the meta-evb tree I observed a number of _evb-* and _u-boot* variables w=
ere
missed.  I fixed them like this:
    $ git grep -l _evb -- meta-evb | xargs sed -i 's/_evb/:evb/'
    $ git grep -l _u-boot -- meta-evb | xargs sed -i 's/_u-boot/:u-boot/'

(There were a few other variables fixed up, but hopefully you get the patte=
rn
 after two.)
-----------------------------------

After this you will want to do a build of your machine(s).  I would also
recommend spot checking a few recipes with `bitbake <recipe> -ne` to ensure=
 the
overrides are applied as you expect.



I will be making changes to meta-evb, meta-aspeed, meta-phosphor, and
meta-facebook shortly under the gerrit topic "override-syntax".  Hopefully =
this
gives a sufficient pattern for others to mimic over the next few days.

--=20
Patrick Williams

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