(NixOS) Home-Manager for POSIX Groups to De-Duplicate Options

[SpectralPixel]

Hi,

excuse me if this is already possible within home-manager, since I couldn't find any documentation regarding this.

I think it would be a great addition to home-manager if you could define shared config between several users by simply defining options for a user group via home-manager.groups.<group-name> in NixOS.

Say that Alice, Bob and Carol share a computer with one configuration, where each has their own user account. Alice and Bob both use the computer for work, so they both join the work-users group and define
home-manager.groups.work-users = { --snip-- programs.onlyoffice.enable = true; }.
Meanwhile, Bob and Carol both use the computer for gaming, so they join the gamers group and define
home-manager.groups.gamers = { --snip-- programs.lutris.enable = true; }.

When it comes to conflicting options, I think the options defined by the local user should always take precedence over the options defined by the group. Or maybe, the safer solution would be to make the interpreter crash early when it's unable to merge configs.

What do y'all think? I feel like there's definitely potential to make configs more DRY to prevent any errors or configs going out of sync over time. Also, it'd be very convenient for sysadmins who manage several different users who share many options.

PS: I don't think it makes sense to simply "define the options in NixOS for all users", since that defeats the point of only making changes to certain users who opt-in.