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satellite/hosts/nixos/common/global/persistence.nix
2023-12-12 14:32:06 +01:00

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Nix

# This file defines the "non-hardware dependent" part of opt-in persistence
# It imports impermanence, defines the basic persisted dirs, and ensures each
# users' home persist dir exists and has the right permissions
#
# It works even if / is tmpfs, btrfs snapshot, or even not ephemeral at all.
{ lib, inputs, config, ... }: {
imports = [ inputs.impermanence.nixosModules.impermanence ];
environment.persistence."/persist/state".directories = [
"/var/lib/systemd"
"/var/lib/nixos"
"/var/log"
];
# Allow non root users to specify the "allowOther" option.
# See [the imperanence readme](https://github.com/nix-community/impermanence#home-manager)
programs.fuse.userAllowOther = true;
# {{{ Create home directories
systemd.tmpfiles.rules =
let
users = lib.filter (v: v != null) [
(config.users.users.adrielus or null)
(config.users.users.guest or null)
];
mkHomePersistFor = location: lib.forEach users
(user: "Q ${location}${user.home} ${user.homeMode} ${user.name} ${user.group} -");
in
lib.flatten [
(mkHomePersistFor "/persist/data")
(mkHomePersistFor "/persist/state")
(mkHomePersistFor "/persist/local/cache")
];
# }}}
}