Add support to make legacy interface optional

If a distribution has migrated all applications over to the modern interface they can compile without the legacy interface.

I think it will be a while until we flip the default "upstream", and even longer for us to "drop it". But this lays the plumbing for all that later.

Projects to update

• gnome-settings-daemon
• plasma-workspace
• gnome-shell
• xfce4-power-manager
• sysprof
• glib2.0
• thermald
• waybar
• budgie-control-center
• powerdevil
• gnome-control-center
• budgie-desktop
• python-dbusmock
• cinnamon
• tuned

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• d699b348 - tests: add helper for getting powerprofilesctl path
• 66fc5391 - tests: don't fail if missing env variable for LD_PRELOAD or PPD_LD_PRELOAD

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• 085d6947 - tests: add helper for getting powerprofilesctl path

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Not sure about this: it adds more complication for no gain for now..

So I'd hold this for some (quite long) time still. As nobody would like to break all the deps using the old api (glib included)

fwiw glib will use the Power Profile Monitor portal, I'm just not sure if that's the go-to. It does, however, still use the legacy interface in the latest version (as of the time of writing) if it's not using the portal. We should fix that.

We still have few things depending on old name: https://codesearch.debian.net/search?q=net.hadess.PowerProfiles&literal=1

But that should only affect us "flipping the default", not making this change, no?

no, no... But I feel it would be just better to do the switch one day and that's it.

Do we have any consumers to have the old interface optional for now?

IMO A nice "goal" would be to have it disabled by default in trixie, and drop the code for forky.

Yeah, let's try.

I've sent various PR upstream for most of GNOME projects, but feel free to address the remaining ones we may care, listed in the first post.

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• 146d195e...d08683ec - 156 commits from branch main
• 9c3dc67c - Add support to make legacy interface optional

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• 9689d6e8 - Add support to make legacy interface optional

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• d23c29fb - Add support to make legacy interface optional

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marked the checklist item gnome-control-center as completed

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