[yocto] How do VIRTUAL-RUNTIME's work and how to create a new keymap for VIRTUAL-RUNTIME_ir_keytable-keymaps

[Christopher Larson]

On Sun, Mar 29, 2015 at 9:23 AM, Matt Schuckmann <Matt.Schuckmann at planar.com
> wrote:

> The v4l-utils recipe defines VIRTUAL-RUNTIME_ir-keytable-keymaps and the
> ir-keytable package appears to RDEPENDS on its value.
>
> I want to define my own key map so  I think that I should create a new
> package, called “my-rc-keymaps”, for now it simple installs a file in
> /lib/udev/rc_keymaps
> In my image recipe I set VIRTUAL-RUNTIME_ir-keytable-keymaps =
> "my-rc-keymaps"
> I then added ir-keytable as a RDEPENDS of another of my packages.
>
> The problem is I don’t see my keymap file getting added to the image, in
> fact it looks like the default rc-keymaps package is getting installed.
>
> If I add “my-rc-keymaps” to the same RDEPENDS I added ir-keytable then it
> gets installed so I know the package is ok.
>
> I don’t understand what’s going on here.
> I also find it frustrating that I don’t see the VIRTUAL-RUNTIME mechanism
> documented so it makes it even harder to understand.
>

VIRTUAL-RUNTIME_something is just a variable. Someone defines it in the
config metadata, then a recipe uses it. That's it. There's nothing magic
about it, nor anything special about it. It's just a convention to let the
user override the package to be used for that functionality.
-- 
Christopher Larson
clarson at kergoth dot com
Founder - BitBake, OpenEmbedded, OpenZaurus
Maintainer - Tslib
Senior Software Engineer, Mentor Graphics
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