embed info in channels and pass host's channel as specialArg

[Pacman99]

gives both builders and hosts information about what channel their on. The former is so you can implement channel-specific logic in a builder. In devos we have a extended nixosSystem, so we would want to do specialArgs.channel.input.lib.nixosSystem, to ensure we are using the write channel for that host. And modules can do logic to hosts based on what channel the host is on.

[blaggacao]

Simple. Effective. Spot on. I would even say: neuralgic. 😉 What not.

An example to cater the fully-featured, maybe?

[gytis-ivaskevicius]

is this even working? Is it not getting overwritten by host.output == "nixosConfigurations" part? I might be misreading something.

Also, maybe it would make more sense to attach the name somewhere around here?

flake-utils-plus/systemFlake.nix

Lines 166 to 173 in 6e6b936

	importChannel = name: value: import (patchChannel system value.input (value.patches or [ ])) {
	inherit system;
	overlays = sharedOverlays ++ (if (value ? overlaysBuilder) then (value.overlaysBuilder pkgs) else [ ]);
	config = channelsConfig // (value.config or { });
	};
	pkgs = mapAttrs importChannel channels;

[Pacman99]

the specialArgs above has a // host.specialArgs. So theres no issue with specialArgs right now, but channel would get overwritten.

And yeah thats a good idea, I'll move name down.

[blaggacao]

Unrelated: I found that nuance a bit implicit. Glad to know we bump on it.

[Pacman99]

Ohh that doesn't actually work, since we can't pass an instantiated nixpkgs, I was just hoping to pass channel metadata, so its pulled directly from the channels argument.

[Pacman99]

So I decided to go ahead and pass the instantiated nixpkgs and then added channel information - name and input - implicitly to all channels

[Pacman99]

I just want to pass channel metadata and passing the imported channel would result in a string which is very hard to use. Whereas input/name is more useful. Theres no place right now to edit all channels, so I think this is the best way to do it.