72 lines
1.7 KiB
Nix
72 lines
1.7 KiB
Nix
# Ephemeral root configuration
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{ config, inputs, lib, ... }:
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let
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cfg = config.my.system.persist;
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in
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{
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imports = [
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inputs.impermanence.nixosModules.impermanence
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];
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options.my.system.persist = with lib; {
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enable = mkEnableOption "stateless system configuration";
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mountPoint = lib.mkOption {
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type = types.str;
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default = "/persistent";
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example = "/etc/nix/persist";
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description = ''
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Which mount point should be used to persist this system's files and
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directories.
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'';
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};
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files = lib.mkOption {
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type = with types; listOf str;
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default = [ ];
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example = [
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"/etc/nix/id_rsa"
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];
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description = ''
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Additional files in the root to link to persistent storage.
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'';
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};
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directories = lib.mkOption {
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type = with types; listOf str;
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default = [ ];
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example = [
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"/var/lib/libvirt"
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];
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description = ''
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Additional directories in the root to link to persistent storage.
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'';
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};
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};
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config = lib.mkIf cfg.enable {
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environment.persistence."${cfg.mountPoint}" = {
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files = [
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"/etc/machine-id"
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"/etc/adjtime"
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"/var/lib/systemd/timesync/clock"
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]
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++ lib.unique cfg.files
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;
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directories = [
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"/etc/nixos" # In case it's storage directory of our configuration
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"/var/log"
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"/var/lib/nixos" # UID/GID maps
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"/var/lib/systemd/coredump" # Coredumps
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"/var/lib/systemd/coredump"
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"/var/lib/systemd" # FIXME: needed?
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"/var/spool" # FIXME: needed?
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"/var/tmp" # FIXME: needed?
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]
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++ lib.unique cfg.directories
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;
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};
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};
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}
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