dotfiles/nixos/systems/altra/filesystems.nix

{...}: {
  disko.devices = {
    disk.boot = {
      type = "disk";
      device = "/dev/sda";

      content = {
        type = "table";
        format = "gpt";

        partitions = [
          {
            name = "boot";
            start = "0";
            end = "1MiB";
            part-type = "primary";
            flags = ["bios_grub"];
          }
          {
            name = "ESP";
            start = "1MiB";
            end = "513MiB";
            bootable = true;
            content = {
              type = "filesystem";
              format = "vfat";
              mountpoint = "/boot";
            };
          }
          {
            name = "swap";
            start = "513MiB";
            end = "4609MiB";
            content = {
              type = "swap";
              randomEncryption = true;
            };
          }
          {
            name = "altra-zpool";
            start = "4609MiB";
            end = "100%";
            content = {
              type = "zfs";
              pool = "altra-zpool";
            };
          }
        ];
      };
    };

    zpool.altra-zpool = {
      type = "zpool";
      rootFsOptions = {
        compression = "zstd-2";
        acltype = "posixacl";
        xattr = "sa";
        atime = "off";
      };

      datasets = {
        "local" = {
          type = "zfs_fs";
          options.mountpoint = "none";
        };

        "local/nix" = {
          type = "zfs_fs";
          mountpoint = "/nix";
          options.mountpoint = "legacy";
        };

        "persist" = {
          type = "zfs_fs";
          options.mountpoint = "none";
        };

        "persist/nomad" = {
          type = "zfs_fs";
          mountpoint = "/var/lib/nomad";
          options.mountpoint = "legacy";
          mountOptions = ["defaults" "noexec"];
        };

        "persist/consul" = {
          type = "zfs_fs";
          mountpoint = "/var/lib/consul";
          options.mountpoint = "legacy";
          mountOptions = ["defaults" "noexec"];
        };

        "persist/log" = {
          type = "zfs_fs";
          mountpoint = "/var/log";
          options.mountpoint = "legacy";
          mountOptions = ["defaults" "noexec"];
        };

        "persist/etc" = {
          type = "zfs_fs";
          mountpoint = "/nix/persist/etc";
          options.mountpoint = "legacy";
          mountOptions = ["defaults" "noexec"];
        };

        "persist/secret" = {
          type = "zfs_fs";
          mountpoint = "/var/secrets";
          options.mountpoint = "legacy";
          mountOptions = ["defaults" "noexec"];
        };

        "persist/var" = {
          type = "zfs_fs";
          options.mountpoint = "none";
        };

        "persist/var/lib" = {
          type = "zfs_fs";
          options.mountpoint = "none";
        };

        "persist/var/lib/nixos" = {
          type = "zfs_fs";
          mountpoint = "/var/lib/nixos";
          options.mountpoint = "legacy";
          mountOptions = ["defaults" "noexec"];
        };

        "persist/var/lib/acme.sh" = {
          type = "zfs_fs";
          mountpoint = "/var/lib/acme.sh";
          options.mountpoint = "legacy";
          mountOptions = ["defaults" "noexec"];
        };
      };
    };

    nodev = {
      "/" = {
        fsType = "tmpfs";
        mountOptions = ["defaults" "size=512M" "mode=755" "noexec"];
      };
      "/tmp" = {
        fsType = "tmpfs";
        mountOptions = ["defaults" "size=1024M" "mode=755" "exec"];
      };
    };
  };

  fileSystems."/nix/persist/etc".neededForBoot = true;

  systemd.tmpfiles.rules = [
    "d /nix/persist/etc/ssh - - - - -"
  ];

  system.activationScripts = {
    machine-id = ''
      ln -sf /nix/persist/etc/machine-id /etc/machine-id
    '';
  };

  environment.etc."ssh/ssh_host_rsa_key".source = "/nix/persist/etc/ssh/ssh_host_rsa_key";
  environment.etc."ssh/ssh_host_rsa_key.pub".source = "/nix/persist/etc/ssh/ssh_host_rsa_key.pub";
  environment.etc."ssh/ssh_host_ed25519_key".source = "/nix/persist/etc/ssh/ssh_host_ed25519_key";
  environment.etc."ssh/ssh_host_ed25519_key.pub".source = "/nix/persist/etc/ssh/ssh_host_ed25519_key.pub";
}