Accounts for nix show up

[ahoneybun]

I don't believe I have seen this with GNOME so I feel like this is a bug as they do not list user ids under 1000 (first user). Here are the ID's for these users:

nixbld1:30001
nixbld2:30002
nixbld3:30003
nixbld4:30004
nixbld5:30005
nixbld6:30006
nixbld7:30007
nixbld8:30008
nixbld9:30009
nixbld10:30010
nixbld11:30011
nixbld12:30012
nixbld13:30013
nixbld14:30014
nixbld15:30015
nixbld16:30016
nixbld17:30017
nixbld18:30018
nixbld19:30019
nixbld20:30020
nixbld21:30021
nixbld22:30022
nixbld23:30023
nixbld24:30024
nixbld25:30025
nixbld26:30026
nixbld27:30027
nixbld28:30028
nixbld29:30029
nixbld30:30030
nixbld31:30031
nixbld32:30032

[mmstick]

What's the UID_MIN/MAX and the path of the file configuring it?

[ahoneybun]

That I do not know, they are created with the nix install script:

sh <(curl -L https://nixos.org/nix/install) --daemon

https://nixos.org/download/

[mmstick]

On Pop!_OS, /etc/login.defs defines UID_MIN 1000 and UID_MAX 60000

[mmstick]

I don't think system accounts assigned via the AccountsService are handled yet, if that's how these accounts are being configured.

[ids1024]

Gnome seems to check the SystemAccount property provided by accountservice.

If the account isn't explicitly configured as being a system account or not, it uses the heuristics in https://gitlab.freedesktop.org/accountsservice/accountsservice/-/blob/main/src/user-classify.c

[mainrs]

These accounts are used for building nix packages as non-root users. A normal user delegates work over to the nix-daemon which is in charge of using these accounts for building packages.

I think they always have to be named nixbld1, nixbld2, and so on. There is probably some way to change them, but the default setup of NixOS, nix, lix and nix-darwin all use the same username format.

It's probably safe to filter these out.