feat: refactor, hyprland - greet with autologin

modules/nixos/base/remote-building.nix

@@ -0,0 +1,132 @@
+{ username, ... }:
+{
+  ####################################################################
+  #
+  #  NixOS's Configuration for Remote Building / Distributed Building
+  #
+  #  Related Docs:
+  #    1. https://github.com/NixOS/nix/issues/7380
+  #    2. https://nixos.wiki/wiki/Distributed_build
+  #    3. https://github.com/NixOS/nix/issues/2589
+  #
+  ####################################################################
+
+  # set local's max-job to 0 to force remote building(disable local building)
+  # nix.settings.max-jobs = 0;
+  nix.distributedBuilds = true;
+  nix.buildMachines = let
+    sshUser = username;
+    # ssh key's path on local machine
+    sshKey = "/home/${username}/.ssh/ai-idols";
+    systems = [
+      # native arch
+      "x86_64-linux"
+
+      # emulated arch using binfmt_misc and qemu-user
+      "aarch64-linux"
+      "riscv64-linux"
+    ];
+    # all available system features are poorly documentd here:
+    #  https://github.com/NixOS/nix/blob/e503ead/src/libstore/globals.hh#L673-L687
+    supportedFeatures = [
+      "benchmark"
+      "big-parallel"
+      "kvm"
+    ];
+  in [
+    # Nix seems always try to build on the machine remotely
+    # to make use of the local machine's high-performance CPU, do not set remote builder's maxJobs too high.
+    # {
+    #   # some of my remote builders are running NixOS
+    #   # and has the same sshUser, sshKey, systems, etc.
+    #   inherit sshUser sshKey systems supportedFeatures;
+    #
+    #   # the hostName should be:
+    #   #   1. a hostname that can be resolved by DNS
+    #   #   2. the ip address of the remote builder
+    #   #   3. a host alias defined globally in /etc/ssh/ssh_config
+    #   hostName = "aquamarine";
+    #   # remote builder's max-job
+    #   maxJobs = 3;
+    #   # speedFactor's a signed integer
+    #   # but it seems that it's not used by Nix, takes no effect
+    #   speedFactor = 1;
+    # }
+    # {
+    #   inherit sshUser sshKey systems supportedFeatures;
+    #   hostName = "ruby";
+    #   maxJobs = 2;
+    #   speedFactor = 1;
+    # }
+    # {
+    #   inherit sshUser sshKey systems supportedFeatures;
+    #   hostName = "kana";
+    #   maxJobs = 2;
+    #   speedFactor = 1;
+    # }
+  ];
+  # optional, useful when the builder has a faster internet connection than yours
+  nix.extraOptions = ''
+    builders-use-substitutes = true
+  '';
+
+  # define the host alias for remote builders
+  # this config will be written to /etc/ssh/ssh_config
+  programs.ssh.extraConfig = ''
+    # idols
+    Host ai
+      HostName 192.168.5.100
+      Port 22
+
+    Host aquamarine
+      HostName 192.168.5.101
+      Port 22
+
+    Host ruby
+      HostName 192.168.5.102
+      Port 22
+
+    Host kana
+      HostName 192.168.5.103
+      Port 22
+
+    # rolling girls
+    Host nozomi
+      HostName 192.168.5.104
+      Port 22
+
+    Host yukina
+      HostName 192.168.5.105
+      Port 22
+
+    Host chiaya
+      HostName 192.168.5.106
+      Port 22
+
+    Host suzu
+      HostName 192.168.5.107
+      Port 22
+  '';
+
+  # define the host key for remote builders so that nix can verify all the remote builders
+  # this config will be written to /etc/ssh/ssh_known_hosts
+  programs.ssh.knownHosts = {
+    # 星野 愛久愛海, Hoshino Aquamarine
+    aquamarine = {
+      hostNames = ["aquamarine" "192.168.5.101"];
+      publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIO0EzzjnuHBE9xEOZupLmaAj9xbYxkUDeLbMqFZ7YPjU";
+    };
+
+    # 星野 瑠美衣, Hoshino Rubii
+    ruby = {
+      hostNames = ["ruby" "192.168.5.102"];
+      publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHrDXNQXELnbevZ1rImfXwmQHkRcd3TDNLsQo33c2tUf";
+    };
+
+    # 有馬 かな, Arima Kana
+    kana = {
+      hostNames = ["kana" "192.168.5.103"];
+      publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJMVX05DQD1XJ0AqFZzsRsqgeUOlZ4opAI+8tkVXyjq+";
+    };
+  };
+}