Infinite recursion encountered by `fileSystem` depend on `home-manager`

chn · November 10, 2024, 7:34am

I need to bind mount (instead of soft link) .zshrc file (generated by home-manager) into /home/chn/.zshrc, but it will encounter infinite recursion.

fileSystems."/home/chn/.zshrc" =
{
  device = "${config.home-manager.users.chn.home.file.".zshrc".source}";
  options = [ "bind" ];
};

Does anyone knows how to fix or workaround it?

chn · November 10, 2024, 8:35am

I workaround it by setting systemd.mounts instead of fileSystems.

waffle8946 · November 10, 2024, 1:29pm

github.com/NixOS/nixpkgs

NixOS 17.03: infinite recursion with dynamic mount points.

opened 06:03PM - 02 Apr 17 UTC

c0c0n3

0.kind: bug 6.topic: nixos

## Issue description If I try to generate `fileSystems` mount point attributes …dynamically, Nix bombs out with an "infinite recursion encountered" message. ### Steps to reproduce Run `nixos-rebuild build` on this configuration: { config, lib, pkgs, ... }: with lib; { imports = [ /etc/nixos/hardware-configuration.nix ]; # Create a user. users.users.sillyb = { isNormalUser = true; }; # Try to dynamically generate mount points for the above user given a # list of directory names. fileSystems = let # Inputs. dirNames = [ "d1" "d2" ]; # Helper function to make a mount point attribute out of a directory # name. Mounting each directory in our user's home. mountRoot = config.users.users.sillyb.home; mount = d: { "${mountRoot}/${d}" = { fsType = "vboxsf"; device = "${d}"; }; }; in # Generated mount points. foldl (ms: d: ms // (mount d)) {} dirNames; } If it helps, this code used to work in 16.09. ## Technical details * System: NixOS 17.03.873.0c041520c3 (Gorilla) running as a VirtualBox 5.1.14 guest) * Nix version: nix-env (Nix) 1.11.8 * Nixpkgs version: 17.03.873.0c041520c3

Also home.file creates a symlink, I don’t see the benefit of creating that AND a bind mount.

chn · November 10, 2024, 2:24pm

I tried to create a bind mount and disable the symlink. Disabling the symlink is easy, so I did not mention it.

I want to use bind mounts instead of symlinks on the cluster with shared home directories between several nodes. With bind mounts, ~/.zshrc on each node will be mounted from the nix store of the separate node and could have different content across nodes. With symlinks, however, ~/.zshrc will have the same content across nodes, pointing to the nix store of a random node (whose home-manager service was started latest), making other nodes fail to read its content.

I tried to set users.users.chn.home and home-manager.users.chn.home.homeDirectory manually, but the infinite recursion still exists. I think the issue is somewhere else.

Here is my full config, you could encounter infinite recursion by nix eval .#nixosConfigurations.pc.config.fileSystems."/home/chn/.zshrc".device

github.com

CHN-beta/nixos/blob/8f6bb9f6db863fa7b2b7e699ee0bfe397f3bdfce/modules/user/default.nix#L128


      
              hashedPassword = "$y$j9T$.UyKKvDnmlJaYZAh6./rf/$65dRqishAiqxCE6LEMjqruwJPZte7uiyYLVKpzdZNH5";
            };
            home-manager.users.root =
            {
              imports = user.sharedModules;
              config.programs.git = { userName = "chn"; userEmail = "chn@chn.moe"; };
            };
          }
          # setup test
          (inputs.lib.mkIf (builtins.elem "test" user.users) { users.users.test.password = "test"; })
          # disable symlinks directly under home created by home-manager, use bind-mount instead
          {
            nixos.user.sharedModules =
            [{
              home.file = inputs.lib.mkMerge (builtins.map (file: { "${file}".enable = false; })
                [ ".zshrc" ".zshenv" ".profile" ".bashrc" ".bash_profile" ]);
            }];
            fileSystems = inputs.lib.mkMerge (builtins.map
              (user: inputs.lib.mkMerge (builtins.map
                (file:
                {