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83 lines
2 KiB
Nix
83 lines
2 KiB
Nix
{
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inputs',
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pkgs,
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...
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}: let
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rollbackStart = pkgs.writeText "rollback-start" ''
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${pkgs.rolling_datasets}/bin/roll_dataset "heater-ssd/ephemeral/home" "10"
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${pkgs.rolling_datasets}/bin/roll_dataset "heater-ssd/ephemeral/root" "10"
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${pkgs.rolling_datasets}/bin/roll_dataset "heater-ssd/ephemeral/nix-tmp" "10"
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'';
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in {
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nixpkgs.overlays = [
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inputs'.self.overlays.show-files-to-be-deleted
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inputs'.self.overlays.rolling_datasets
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];
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environment.systemPackages = [
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pkgs.show-files-to-be-deleted
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];
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environment.persistence."/nix/persist" = {
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hideMounts = true;
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directories = [
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"/var/log"
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"/var/lib/nixos"
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"/var/lib/systemd/coredump"
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];
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files = [
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"/etc/machine-id"
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"/etc/ssh/ssh_host_rsa_key"
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"/etc/ssh/ssh_host_rsa_key.pub"
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"/etc/ssh/ssh_host_ed25519_key"
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"/etc/ssh/ssh_host_ed25519_key.pub"
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];
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};
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boot.initrd.systemd.storePaths = with pkgs; [
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zfs
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busybox
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rolling_datasets
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rollbackStart
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];
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boot.initrd.systemd.services.rollback = {
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description = "Rollback ZFS datasets to a pristine state";
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wantedBy = [
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"initrd.target"
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];
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after = [
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"zfs-import-heater-ssd.service"
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];
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before = [
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"sysroot.mount"
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];
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path = with pkgs; [
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zfs
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busybox
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];
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unitConfig.DefaultDependencies = "no";
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serviceConfig.Type = "oneshot";
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serviceConfig.ExecStart = "/bin/sh ${rollbackStart}";
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};
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systemd.services."mount-old-datasets" = {
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description = "Mount old versions of datasets";
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wantedBy = ["local-fs.target"];
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after = ["local-fs.target"];
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script = ''
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${pkgs.rolling_datasets}/bin/mount_datasets "heater-ssd/ephemeral/home" "/home/.old"
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${pkgs.rolling_datasets}/bin/mount_datasets "heater-ssd/ephemeral/root" "/root/.old"
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${pkgs.rolling_datasets}/bin/mount_datasets "heater-ssd/ephemeral/nix-tmp" "/nix/tmp/.old"
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'';
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = "yes";
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TimeoutStartSec = "5m";
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};
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};
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}
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