colin
b53d2f945d
this is for "service directories": public, protocol-based fs access. e.g. /srv/ftp might be a share which is exposed over FTP. /srv/www might be a share which is exposed over www (or webdav).
105 lines
4.4 KiB
Nix
105 lines
4.4 KiB
Nix
# borrows from:
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# https://xeiaso.net/blog/paranoid-nixos-2021-07-18
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# https://elis.nu/blog/2020/05/nixos-tmpfs-as-root/
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# https://github.com/nix-community/impermanence
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{ lib, config, impermanence, ... }:
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with lib;
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let
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cfg = config.sane.impermanence;
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in
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{
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options = {
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sane.impermanence.enable = mkOption {
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default = false;
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type = types.bool;
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};
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sane.impermanence.home-dirs = mkOption {
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default = [];
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type = types.listOf (types.either types.str (types.attrsOf types.str));
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};
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sane.impermanence.service-dirs = mkOption {
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default = [];
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type = types.listOf (types.either types.str (types.attrsOf types.str));
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};
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};
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config = let
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map-dir = defaults: dir: if isString dir then
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map-dir defaults { directory = "${defaults.directory}${dir}"; }
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else
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defaults // dir
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;
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map-dirs = defaults: dirs: builtins.map (map-dir defaults) dirs;
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map-home-dirs = map-dirs { user = "colin"; group = "users"; mode = "0755"; directory = "/home/colin/"; };
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map-sys-dirs = map-dirs { user = "root"; group = "root"; mode = "0755"; directory = ""; };
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map-service-dirs = map-dirs { user = "root"; group = "root"; mode = "0755"; directory = ""; };
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in mkIf cfg.enable {
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environment.persistence."/nix/persist" = {
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directories = (map-home-dirs ([
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# cache is probably too big to fit on the tmpfs
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# TODO: we could bind-mount it to something which gets cleared per boot, though.
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".cache"
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".cargo"
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".rustup"
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".ssh"
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# intentionally omitted:
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# ".config" # managed by home-manager
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# ".local" # nothing useful in here
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] ++ cfg.home-dirs)) ++ (map-sys-dirs [
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{ mode = "0700"; directory = "/etc/NetworkManager/system-connections"; }
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# "/etc/nixos"
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"/etc/ssh"
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"/var/log"
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"/var/backup" # for e.g. postgres dumps
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]) ++ (map-service-dirs ([
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# "/var/lib/AccountsService" # not sure what this is, but it's empty
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"/var/lib/alsa" # preserve output levels, default devices
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# "/var/lib/blueman" # files aren't human readable
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"/var/lib/bluetooth" # preserve bluetooth handshakes
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"/var/lib/colord" # preserve color calibrations (?)
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# "/var/lib/dhclient" # empty on lappy; dunno about desko
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# "/var/lib/fwupd" # not sure why this would need persistent state
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# "/var/lib/geoclue" # empty on lappy
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# "/var/lib/lockdown" # empty on desko; might store secrets after iOS handshake?
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# "/var/lib/logrotate.status" # seems redundant with what's in /var/log?
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"/var/lib/machines" # maybe not needed, but would be painful to add a VM and forget.
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# "/var/lib/misc" # empty on lappy
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# "/var/lib/NetworkManager" # looks to be mostly impermanent state?
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# "/var/lib/NetworkManager-fortisslvpn" # empty on lappy
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# "/var/lib/nixos" # has some uid/gid maps, but we enforce these to be deterministic.
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# "/var/lib/PackageKit" # wtf is this?
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# "/var/lib/power-profiles-daemon" # redundant with nixos declarations
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# "/var/lib/private" # empty on lappy
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# "/var/lib/systemd" # nothing obviously necessary
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# "/var/lib/udisks2" # empty on lappy
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# "/var/lib/upower" # historic charge data. unnecessary, but maybe used somewhere?
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#
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# servo additions:
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# "/var/lib/dhparams" # https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/security/dhparams.nix
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# "/var/lib/dovecot"
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# "/var/lib/duplicity"
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] ++ cfg.service-dirs));
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files = [
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"/etc/machine-id"
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# "/home/colin/knowledge"
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"/home/colin/.zsh_history"
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# # XXX these only need persistence because i have mutableUsers = true, i think
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# "/etc/group"
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# "/etc/passwd"
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# "/etc/shadow"
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# { file = "/home/test2"; persistentStoragePath = "/nix/persist"; }
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];
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};
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systemd.services.sane-sops = {
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description = "sops relies on /etc/ssh being available, so re-run its activation AFTER fs-local";
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script = config.system.activationScripts.setupSecrets.text;
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after = [ "fs-local.target" ];
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wantedBy = [ "multi-user.target" ];
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};
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};
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}
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