[OE-core] Package management DB in old-style SDK

[Christopher Larson]

On Mon, Apr 18, 2016 at 6:38 PM Paul Eggleton <paul.eggleton at linux.intel.com>
wrote:

> On Mon, 18 Apr 2016 21:01:27 Denys Dmytriyenko wrote:
> > On Tue, Apr 19, 2016 at 10:35:29AM +1200, Paul Eggleton wrote:
> > > Hi Denys,
> > > On Mon, 18 Apr 2016 18:14:55 Denys Dmytriyenko wrote:
> > > > I'm still using the old-style SDK (meta-toolchain) for our products
> due
> > > > to some code customizations in it and some of our use cases rely on
> the
> > > > opkg package management database being present in sysroots, so
> packages
> > > > can be manipulated in SDK with opkg command. It appears that
> > > > /var/lib/opkg is now empty and the package database is no longer
> > > > supplied with the SDK.
> > > >
> > > > I know about the new-style populate_sdk and the even newer Extensible
> > > > SDK, but not yet ready to convert our old use cases to that. Since
> there
> > > > were lots of changes around the way SDKs work in OE-Core in the past
> > > > couple releases, I'm failing to find the change that causes opkg DB
> to
> > > > be missing from the old style SDK. I'll appreciate any pointers in
> > > > helping me debug and/or fix this issue with my SDKs. Thanks.
> > >
> > > As far as ipk is concerned I think it was this commit:
> > >
> http://cgit.openembedded.org/openembedded-core/commit/?id=c8e0ec2da9ad4c
> > >   e1c103966906a85f68c15400dd>
> > > Unfortunately it wasn't made optional.
> >
> > Thanks, Paul!
> >
> > Unfortunately, the change is in the library, which is quite difficult to
> > override in another layer...
>


Actually, overriding a library is trivial given the way we do our python
package. Copy meta/lib/oe/__init__.py into <your layer>/lib/oe/, copy
meta/lib/oe/sdk.py to <your layer>/lib/oe/ and modify, and make sure your
layer is prioritized correctly, and your forked version will be used in
preference.

It's not ideal, for the same reasons it's not ideal to override a class --
you're stuck keeping it in sync, so for that reason I'd not recommend it,
but it's not difficult to do the override :)
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