sops to create ssh keys for users

flake.lock

@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1715756862,
-        "narHash": "sha256-cNGZK/RNvb29giR2KtnbwU5lx2Kw+wWqAaeWqfYlPts=",
+        "lastModified": 1716431128,
+        "narHash": "sha256-t3T8HlX3udO6f4ilLcN+j5eC3m2gqsouzSGiriKK6vk=",
         "owner": "nix-community",
         "repo": "disko",
-        "rev": "cb1d6fba694ab3887600d606106f5a044ba1712c",
+        "rev": "7ffc4354dfeb37c8c725ae1465f04a9b45ec8606",
         "type": "github"
       },
       "original": {
@@ -27,11 +27,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1715486357,
-        "narHash": "sha256-4pRuzsHZOW5W4CsXI9uhKtiJeQSUoe1d2M9mWU98HC4=",
+        "lastModified": 1716448020,
+        "narHash": "sha256-u1ddoBOILtLVX4NYzqSZ9Qaqusql1M4reLd1fs554hY=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "44677a1c96810a8e8c4ffaeaad10c842402647c1",
+        "rev": "25dedb0d52c20448f6a63cc346df1adbd6ef417e",
         "type": "github"
       },
       "original": {
@@ -40,14 +40,29 @@
         "type": "github"
       }
     },
+    "impermanence": {
+      "locked": {
+        "lastModified": 1708968331,
+        "narHash": "sha256-VUXLaPusCBvwM3zhGbRIJVeYluh2uWuqtj4WirQ1L9Y=",
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "rev": "a33ef102a02ce77d3e39c25197664b7a636f9c30",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "type": "github"
+      }
+    },
     "nix-secrets": {
       "flake": false,
       "locked": {
-        "lastModified": 1715783829,
-        "narHash": "sha256-aNuuTd4nXt9SxYLgJSgBxuvIBmAyh5+2IT2iLepZKds=",
+        "lastModified": 1716456952,
+        "narHash": "sha256-fd57j4M++Fte1hrRZkDIqGbYbimqPNmERlFr/Fbh1Ek=",
         "ref": "refs/heads/master",
-        "rev": "450e494f36a74c0786d1cb01db46731b01b713dc",
-        "revCount": 5,
+        "rev": "f5abdf254dbee888be5f65c96a4a571f2a91da91",
+        "revCount": 28,
         "type": "git",
         "url": "ssh://git@git.bitlab21.com/sam/nix-secrets.git"
       },
@@ -70,11 +85,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1715458492,
-        "narHash": "sha256-q0OFeZqKQaik2U8wwGDsELEkgoZMK7gvfF6tTXkpsqE=",
+        "lastModified": 1716061101,
+        "narHash": "sha256-H0eCta7ahEgloGIwE/ihkyGstOGu+kQwAiHvwVoXaA0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "8e47858badee5594292921c2668c11004c3b0142",
+        "rev": "e7cc61784ddf51c81487637b3031a6dd2d6673a2",
         "type": "github"
       },
       "original": {
@@ -86,11 +101,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1715534503,
-        "narHash": "sha256-5ZSVkFadZbFP1THataCaSf0JH2cAH3S29hU9rrxTEqk=",
+        "lastModified": 1716330097,
+        "narHash": "sha256-8BO3B7e3BiyIDsaKA0tY8O88rClYRTjvAp66y+VBUeU=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "2057814051972fa1453ddfb0d98badbea9b83c06",
+        "rev": "5710852ba686cc1fd0d3b8e22b3117d43ba374c2",
         "type": "github"
       },
       "original": {
@@ -104,6 +119,7 @@
       "inputs": {
         "disko": "disko",
         "home-manager": "home-manager",
+        "impermanence": "impermanence",
         "nix-secrets": "nix-secrets",
         "nixpkgs": "nixpkgs",
         "nixpkgs-unstable": "nixpkgs-unstable",
@@ -118,11 +134,11 @@
         "nixpkgs-stable": "nixpkgs-stable"
       },
       "locked": {
-        "lastModified": 1715482972,
-        "narHash": "sha256-y1uMzXNlrVOWYj1YNcsGYLm4TOC2aJrwoUY1NjQs9fM=",
+        "lastModified": 1716400300,
+        "narHash": "sha256-0lMkIk9h3AzOHs1dCL9RXvvN4PM8VBKb+cyGsqOKa4c=",
         "owner": "mic92",
         "repo": "sops-nix",
-        "rev": "b6cb5de2ce57acb10ecdaaf9bbd62a5ff24fa02e",
+        "rev": "b549832718b8946e875c016a4785d204fcfc2e53",
         "type": "github"
       },
       "original": {

flake.nix

@@ -17,6 +17,10 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
+    impermanence = {
+      url = "github:nix-community/impermanence";
+    };
+
     # Secrets management
     sops-nix = {
       url = "github:mic92/sops-nix";
@@ -34,6 +38,7 @@
     nixpkgs,
     home-manager,
     disko,
+    #impermanence,
     ...
   } @ inputs: 
   let
@@ -73,11 +78,18 @@
       bootstrap = nixpkgs.lib.nixosSystem {
         inherit specialArgs;
         modules = [
-          disko.nixosModules.disko
-          ./hosts/common/disks/gpt-bios-compact.nix
           ./hosts/bootstrap
         ];
       };
+      sparky = nixpkgs.lib.nixosSystem {
+        inherit specialArgs;
+        modules = [
+          ./hosts/sparky
+          home-manager.nixosModules.home-manager{
+            home-manager.extraSpecialArgs = specialArgs;
+          }
+        ];
+      };
     };
 
 #    # Standalone home-manager configuration entrypoint

home/common/core/default.nix

@@ -1,5 +1,6 @@
-{ pkgs, ... }:
+{ config, lib, pkgs, outputs, ... }:
 {
   imports = [
+    ./zsh.nix
   ] ;
 }

home/common/core/zsh.nix

@@ -0,0 +1,23 @@
+{ pkgs, config, ... }: {
+
+  programs.zsh = {
+    enable = true;
+    enableCompletion = true;
+    autosuggestion.enable = true;
+    syntaxHighlighting.enable = true;
+  
+    shellAliases = {
+      ll = "ls -l";
+    };
+    history.size = 10000;
+    history.path = "${config.xdg.dataHome}/zsh/history";
+
+    initExtra = '' 
+      bindkey -v 
+      bindkey "^H" backward-delete-char
+      bindkey "^?" backward-delete-char
+      set -o vi
+      export TERM=xterm
+    '';
+  };
+} 

home/common/optional/sops.nix

@@ -1,8 +1,10 @@
-{ inputs, config, ... }:
+{ inputs, config, osConfig, ... }:
 let
   secretsDirectory = builtins.toString inputs.nix-secrets;
   secretsFile = "${secretsDirectory}/secrets.yaml";
   homeDirectory = config.home.homeDirectory;
+  username = config.home.username;
+  hostname = osConfig.networking.hostName;
 in
 {
   imports = [
@@ -10,18 +12,10 @@ in
   ];
 
   sops = {
-    age.keyFile = "${homeDirectory}/.config/sops/age/keys.txt";
+    age.sshKeyPaths = ["${homeDirectory}/.ssh/id_ed25519"];
 
     defaultSopsFile = "${secretsFile}";
     validateSopsFiles = false;
 
-    secrets = {
-      "ssh_keys/sam/gitea" = {
-        path = "${homeDirectory}/.ssh/gitea";
-      };
-      "ssh_keys/sam/gitea.pub" = {
-        path = "${homeDirectory}/.ssh/gitea.pub";
-      };
-    };
   };
 }

home/fileserver.nix

@@ -5,12 +5,13 @@
   ...
 }: {
   imports = [
+    # Import users
+    ./users/admin
+
     ./common/core
     ./common/optional/sops.nix
 
     # Import optional
     ./common/optional/git.nix
 
-    # Import users
-    ./users/admin
   ];

home/nixdev.nix

@@ -5,6 +5,9 @@
   ...
 }: {
   imports = [
+    # Import users
+    ./users/sam
+
     ./common/core
     ./common/optional/desktop/hyprland
     ./common/optional/desktop/waybar.nix
@@ -12,9 +15,6 @@
 
     # Import optional
     ./common/optional/git.nix
-
-    # Import users
-    ./users/sam
   ];
 
   #  ------  

home/sparky.nix

@@ -0,0 +1,18 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}: {
+  imports = [
+    # Import users
+    ./users/media
+
+    ./common/core
+    ./common/optional/sops.nix
+
+    # Import optional
+    ./common/optional/git.nix
+
+  ];
+}

home/users/admin/default.nix

@@ -11,28 +11,6 @@
   home.packages = [
   ];
 
-  programs.zsh = {
-    enable = true;
-    enableCompletion = true;
-    autosuggestion.enable = true;
-    syntaxHighlighting.enable = true;
-  
-    shellAliases = {
-      ll = "ls -l";
-    };
-    history.size = 10000;
-    history.path = "${config.xdg.dataHome}/zsh/history";
-
-    initExtra = '' 
-      bindkey -v 
-      bindkey "^H" backward-delete-char
-      bindkey "^?" backward-delete-char
-      set -o vi
-      export TERM=xterm
-    '';
-  };
-  
-
   home.file = {
   };
 

home/users/media/default.nix

@@ -0,0 +1,39 @@
+{ config, pkgs, lib, outputs, inputs, ... }:
+
+{
+  home.username = "media";
+  home.homeDirectory = "/home/media";
+  home.stateVersion = "23.11"; 
+
+  imports = [
+    inputs.impermanence.nixosModules.home-manager.impermanence
+  ] ++ (builtins.attrValues outputs.homeManagerModules); # import all homeManagerModules?
+
+ xdg.userDirs = {
+    enable = true;
+    createDirectories = false;
+    desktop = "/home/media/Desktop";
+    documents = null;
+    download = null;
+    music = null;
+    pictures = null;
+    publicShare = null;
+    templates = null;
+    videos = null;
+  };
+
+  home.packages = [
+  ];
+
+  home.file = {
+  };
+
+  home.sessionPath = [
+  ];
+
+  home.sessionVariables = {
+  };
+
+  programs.home-manager.enable = true;
+}
+

home/users/sam/default.nix

@@ -16,29 +16,7 @@
     pkgs.xfce.thunar
     #pkgs.age
   ];
-
-  programs.zsh = {
-    enable = true;
-    enableCompletion = true;
-    programs.zsh.autosuggestion.enable = true;
-    syntaxHighlighting.enable = true;
   
-    shellAliases = {
-      ll = "ls -l";
-    };
-    history.size = 10000;
-    history.path = "${config.xdg.dataHome}/zsh/history";
-
-    initExtra = '' 
-      bindkey -v 
-      bindkey "^H" backward-delete-char
-      bindkey "^?" backward-delete-char
-      set -o vi
-      export TERM=xterm
-    '';
-  };
-  
-
   home.file = {
     ".icons/bibata".source = "${pkgs.bibata-cursors}/share/icons/Bibata-Modern-Classic";
   };
@@ -71,6 +49,5 @@
      IMAGE_EDITOR="";
   };
 
-  programs.home-manager.enable = true;
 }
 

hosts/bootstrap/default.nix

@@ -1,89 +1,103 @@
-{  lib, pkgs, configLib, configVars, ... }:
+{ inputs, config, lib, pkgs, outputs,... }:
+let
+  pubKeys = lib.filesystem.listFilesRecursive (../common/users/keys);
+in 
 {
-  imports = [
+  imports =
+    [ 
+      # Disk configuration
+      inputs.disko.nixosModules.disko
+      (import ../common/disks/std-disk-config.nix { device = "/dev/vda"; })
+      ../common/optional/btrfs-impermanence.nix
+      inputs.impermanence.nixosModules.impermanence
+
       # Import core options
       ./hardware-configuration.nix
       ../common/core
+    ];
 
-      # Import optional options
-#      ../common/optional/openssh
+  nixpkgs = {
+      overlays = [
+        outputs.overlays.additions
+        outputs.overlays.modifications
+        outputs.overlays.unstable-packages
+      ];
+      config = {
+        allowUnfree = true;
+      };
+    };
 
-      # Create users for this host
-      ../common/users/admin
-  ];
+  fileSystems."/persist".neededForBoot = true;
+  environment.persistence."/persist" = {
+    hideMounts = true;
+    directories = [
+      "/etc/nixos"
+    ];
+    files = [
+      "/etc/ssh/ssh_host_ed25519_key"
+      "/etc/ssh/ssh_host_ed25519_key.pub"
+      "/etc/ssh/deploy_key-ssh-ed25519"
+    ];
+  };
 
-  #virtualisation.virtualbox.guest.enable = true;
-  virtualisation.libvirtd = {
-    qemu = {
-      package = pkgs.qemu_kvm; # only emulates host arch, smaller download
-      swtpm.enable = true; # allows for creating emulated TPM
-      ovmf.packages = [(pkgs.OVMF.override {
-        secureBoot = true;
-        tpmSupport = true;
-      }).fd]; # or use pkgs.OVMFFull.fd, which enables more stuff
+  boot = {
+    loader = {
+      systemd-boot.enable = true;
+      efi.canTouchEfiVariables = true;
+      timeout = 3;
     };
   };
-  #fileSystems."/boot".options = ["umask=0077"]; # Removes permissions and security warnings.
-  #boot.loader.efi.canTouchEfiVariables = true;
-  #boot.loader.grub.device = "/dev/vda"; 
-  boot.loader.grub.enable = true;
-#  boot.loader.systemd-boot = {
-#    enable = true;
-#    # we use Git for version control, so we don't need to keep too many generations.
-#    # FIXME  lower this even more after testing complete
-#    configurationLimit = lib.mkDefault 10;
-#    # pick the highest resolution for systemd-boot's console.
-#    consoleMode = lib.mkDefault "max";
-#  };
-  boot.initrd.systemd.enable = true;
 
-  i18n.defaultLocale = "en_GB.UTF-8";
-  console = {
-    font = "Lat2-Terminus16";
-    keyMap = "uk";
-    useXkbConfig = false; 
+  users = {
+    mutableUsers = true;
+    extraUsers = {
+      root = {
+        initialPassword = "1234";
+        openssh.authorizedKeys.keys = lib.lists.forEach pubKeys (key: builtins.readFile key);
+      };
+     };
   };
 
-
   networking = {
     hostName = "bootstrap";
     networkmanager.enable = true;
     enableIPv6 = false;
   };
 
-  services = {
-    qemuGuest.enable = true;
-    openssh = {
-      enable = true;
-      ports = [22]; # FIXME: Make this use configVars.networking
-      settings.PermitRootLogin = "yes";
-      # Fix LPE vulnerability with sudo use SSH_AUTH_SOCK: https://github.com/NixOS/nixpkgs/issues/31611
-      # this mitigates the security issue caused by enabling u2fAuth in pam
-      authorizedKeysFiles = lib.mkForce ["/etc/ssh/authorized_keys.d/%u"];
+  services.openssh = {
+    enable = true;
+    ports = [22];
+    authorizedKeysFiles = lib.mkForce ["/etc/ssh/authorized_keys.d/%u"];
+    hostKeys = [{
+      path = "/persist/etc/ssh/ssh_host_ed25519_key";
+      type = "ed25519";
+    }];
+    settings = {
+      PasswordAuthentication = false;
+      PermitRootLogin = "yes";
+      PubKeyAuthentication = "yes";
+      StreamLocalBindUnlink = "yes";
+      UsePAM = true;
     };
   };
 
+  programs.ssh.extraConfig = '' 
+    Host git.bitlab21.com
+        IdentitiesOnly yes
+        StrictHostKeyChecking no
+        IdentityFile /etc/ssh/deploy_key-ssh-ed25519
+  '';
+
   security.pam = {
     sshAgentAuth.enable = true;
-    #FIXME the above is deprecated in 24.05 but we will wait until release
-    #sshAgentAuth.enable = true;
-    services = {
-      sudo.u2fAuth = true;
-    };
   };
+  
+  networking.firewall.allowedTCPPorts = [ 22 ];
 
-  # ssh-agent is used to pull my private secrets repo from gitlab when deploying nix-config.
- # programs.ssh.startAgent = true;
-
-  environment.systemPackages = builtins.attrValues {
-    inherit(pkgs)
-    wget
-    curl
-    git
-    rsync;
+  services = {
+    qemuGuest.enable = true;
   };
 
-
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
   system.stateVersion = "23.11";
 }

hosts/bootstrap/hardware-configuration.nix

@@ -10,17 +10,9 @@
 
   boot.initrd.availableKernelModules = [ "ahci" "xhci_pci" "virtio_pci" "sr_mod" "virtio_blk" ];
   boot.initrd.kernelModules = [ ];
-  boot.kernelModules = [ "kvm-amd" "kvm-intel" ];
+  boot.kernelModules = [ "kvm-amd" ];
   boot.extraModulePackages = [ ];
 
-  fileSystems."/" =
-    { 
-    };
-
-  swapDevices =
-    [ 
-    ];
-
   # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
   # (the default) this is the recommended approach. When using systemd-networkd it's
   # still possible to use this option, but it's recommended to use it in conjunction

hosts/common/core/default.nix

@@ -1,6 +1,8 @@
-{pkgs, ...}: {
+{ pkgs, lib, inputs, config, ...}: 
+{
   imports = [
     ./sops.nix
+    ./locale.nix
   ];
 
   environment.systemPackages = [
@@ -8,6 +10,7 @@
       pkgs.curl
       pkgs.just
       pkgs.git
+      pkgs.neovim
   ]; 
 
 }

hosts/common/core/locale.nix

@@ -0,0 +1,8 @@
+{
+  i18n.defaultLocale = "en_GB.UTF-8";
+  console = {
+    font = "Lat2-Terminus16";
+    keyMap = "uk";
+    useXkbConfig = false; 
+  };
+}

hosts/common/core/sops.nix

@@ -1,8 +1,8 @@
-{ pkgs, inputs, config, configVars, ... }:
+{ pkgs, inputs, config, username, ... }:
+
 let
   secretsDirectory = builtins.toString inputs.nix-secrets;
   secretsFile = "${secretsDirectory}/secrets.yaml";
-  homeDirectory = "/home/${configVars.username}";
 in
 {
   imports = [
@@ -15,8 +15,12 @@ in
 
     age = {
       sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
-      keyFile = "/var/lib/sops-nix/key.txt";
-      generateKey = true;
+    };
+    secrets =  {
+        "passwords/root".neededForUsers = true;
+        "ssh_keys/deploy_key/id_ed25519" = {
+          path = "/etc/ssh/deploy_key-ssh-ed25519";
+        };
     };
   };
 }

hosts/common/disks/luks-btrfs-subvolumes.nix

@@ -0,0 +1,63 @@
+{
+  disko.devices = {
+    disk = {
+      vdb = {
+        type = "disk";
+        device = "/dev/vdb";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              size = "512M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [
+                  "defaults"
+                ];
+              };
+            };
+            luks = {
+              size = "100%";
+              content = {
+                type = "luks";
+                name = "crypted";
+                # disable settings.keyFile if you want to use interactive password entry
+                #passwordFile = "/tmp/secret.key"; # Interactive
+                settings = {
+                  allowDiscards = true;
+                  keyFile = "/tmp/secret.key";
+                };
+                additionalKeyFiles = [ "/tmp/additionalSecret.key" ];
+                content = {
+                  type = "btrfs";
+                  extraArgs = [ "-f" ];
+                  subvolumes = {
+                    "/root" = {
+                      mountpoint = "/";
+                      mountOptions = [ "compress=zstd" "noatime" ];
+                    };
+                    "/home" = {
+                      mountpoint = "/home";
+                      mountOptions = [ "compress=zstd" "noatime" ];
+                    };
+                    "/nix" = {
+                      mountpoint = "/nix";
+                      mountOptions = [ "compress=zstd" "noatime" ];
+                    };
+                    "/swap" = {
+                      mountpoint = "/.swapvol";
+                      swap.swapfile.size = "20M";
+                    };
+                  };
+                };
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}

hosts/common/disks/std-disk-config.nix

@@ -1,11 +1,9 @@
+{device ? throw "Must define a device, e.g. /dev/sda"}:
 {
   disko.devices = {
-    disk = {
-      #FIXME change to proper device or make dynamic like figdetingbits
-      sda = {
+    disk.main = {
+        inherit device;
         type = "disk";
-        # FIXME change to proper device or make dynamic like figdetingbits
-        device = "/dev/sda";
         content = {
           type = "gpt";
           partitions = {
@@ -21,25 +19,38 @@
                 mountpoint = "/boot";
               };
             };
-            root = {
-              size = "100%";
-              content = {
-                type = "btrfs";
-                extraArgs = [ "-f" ]; # Override existing partition
-                # Subvolumes must set a mountpoint in order to be mounted,
-                # unless their parent is mounted
+          root = {
+            name = "root";
+            size = "100%";
+            content = {
+              type = "lvm_pv";
+              vg = "root_vg";
+            };
+          };
+        };
+      };
+    };
+    lvm_vg = {
+      root_vg = {
+        type = "lvm_vg";
+        lvs = {
+          root = {
+            size = "100%FREE";
+            content = {
+              type = "btrfs";
+              extraArgs = ["-f"];
                 subvolumes = {
                   "/root" = {
                     mountpoint = "/";
                   };
 
                   "/persist" = {
-                    mountOptions = [ "compress=zstd" ];
+                    mountOptions = [ "subvol=persist" ];
                     mountpoint = "/persist";
                   };
 
                   "/nix" = {
-                    mountOptions = [ "compress=zstd" "noatime" ];
+                    mountOptions = [ "subvol=nix" "noatime" ];
                     mountpoint = "/nix";
                   };
 
@@ -51,7 +62,6 @@
                 };
               };
             };
-          };
         };
       };
     };

hosts/common/optional/btrfs-impermanence.nix

@@ -0,0 +1,29 @@
+{lib, ...}:
+{
+boot.initrd.postDeviceCommands = lib.mkAfter ''
+  mkdir /btrfs_tmp
+    mount /dev/root_vg/root /btrfs_tmp
+    if [[ -e /btrfs_tmp/root ]]; then
+        mkdir -p /btrfs_tmp/old_roots
+        timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
+        mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
+    fi
+
+    delete_subvolume_recursively() {
+        IFS=$'\n'
+        for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
+            delete_subvolume_recursively "/btrfs_tmp/$i"
+        done
+        btrfs subvolume delete "$1"
+    }
+
+    for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
+        delete_subvolume_recursively "$i"
+    done
+
+    btrfs subvolume create /btrfs_tmp/root
+    umount /btrfs_tmp
+  '';
+
+}
+

hosts/common/optional/openssh.nix

@@ -0,0 +1,33 @@
+{ lib, config, ... }:
+let
+  sshPort = 22;
+in
+
+{
+  services.openssh = {
+    enable = true;
+    ports = [ sshPort ];
+    authorizedKeysFiles = lib.mkForce ["/etc/ssh/authorized_keys.d/%u"];
+    hostKeys = [{
+      path = "/persist/etc/ssh/ssh_host_ed25519_key";
+      type = "ed25519";
+    }];
+    settings = {
+      PasswordAuthentication = false;
+      PermitRootLogin = "no";
+      PubKeyAuthentication = "yes";
+      StreamLocalBindUnlink = "yes";
+      UsePAM = true;
+    };
+  };
+  security.pam = {
+    sshAgentAuth.enable = true;
+  };
+  programs.ssh.extraConfig = '' 
+    Host git.bitlab21.com
+        IdentitiesOnly yes
+        StrictHostKeyChecking no
+        IdentityFile /etc/ssh/deploy_key-ssh-ed25519
+  '';
+  networking.firewall.allowedTCPPorts = [ sshPort ];
+}

hosts/common/optional/openssh/default.nix

@@ -1,22 +0,0 @@
-{ lib, config, ... }:
-let
-  sshPort = 22;
-in
-
-{
-  services.openssh = {
-    enable = true;
-    ports = [ sshPort ];
-
-    settings = {
-      # Harden
-      PasswordAuthentication = true;
-      PermitRootLogin = "no";
-      # Automatically remove stale sockets
-      StreamLocalBindUnlink = "yes";
-    };
-
-  };
-
-  networking.firewall.allowedTCPPorts = [ sshPort ];
-}

hosts/common/users/keys/gitea.pub

@@ -1 +0,0 @@
-ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILywv6g5k5cOVplxgbbStrGf3qYVukgCcd80TJSBM8e8 sam@nixos

hosts/common/users/keys/sam@id_ed25519.pub

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFc+y7KKEbutJe9u9UPP3rWqchjS7/yrpyoQRd178c7u sam

hosts/common/users/media/default.nix

@@ -0,0 +1,49 @@
+{ pkgs, inputs, config, lib, ... }:
+let
+  pubKeys = lib.filesystem.listFilesRecursive (../keys);
+  hostname = config.networking.hostName;
+  sopsHashedPasswordFile = lib.optionalString (lib.hasAttr "sops-nix" inputs) config.sops.secrets."passwords/media".path;
+  secretsDirectory = builtins.toString inputs.nix-secrets;
+  secretsFile = "${secretsDirectory}/secrets.yaml";
+in 
+{
+  users.users.media = {
+    isNormalUser = true;
+    shell = pkgs.zsh; # default shell
+    #hashedPasswordFile = sopsHashedPasswordFile;
+    password = "nixos";
+    openssh.authorizedKeys.keys = lib.lists.forEach pubKeys (key: builtins.readFile key);
+
+    extraGroups =
+       [ "qemu-libvirtd" "libvirtd" 
+         "wheel" "video" "audio" "disk" "networkmanager" 
+       ]; 
+
+  };
+
+  sops.secrets."passwords/media" = {
+    sopsFile = "${secretsFile}";
+    neededForUsers = true;
+  };
+
+  sops.secrets."ssh_keys/media/id_ed25519" = {
+    path = "/home/media/.ssh/id_ed25519";
+  };
+
+  sops.secrets."ssh_keys/media/id_ed25519.pub" = {
+    path = "/home/media/.ssh/id_ed25519.pub";
+  };
+
+  programs.zsh.enable = true;
+  programs.fuse.userAllowOther = true;
+
+  home-manager = {
+    extraSpecialArgs = { inherit inputs; };
+    users = {
+      media = import ../../../../home/${hostname}.nix;
+    };
+  };
+
+  environment.systemPackages = [
+  ]; 
+}

hosts/common/users/sam/default.nix

@@ -1,14 +1,18 @@
 { pkgs, inputs, config, lib, ... }:
 let
-  pubKeys = lib.filesystem.listFilesRecursive (../keys);
   hostname = config.networking.hostName;
+  pubKeys = lib.filesystem.listFilesRecursive (../keys);
+  sopsHashedPasswordFile = lib.optionalString (lib.hasAttr "sops-nix" inputs) config.sops.secrets."passwords/sam".path;
+  secretsDirectory = builtins.toString inputs.nix-secrets;
+  secretsFile = "${secretsDirectory}/secrets.yaml";
 in 
 {
   users.users.sam = {
+    mutableUsers = true;
     isNormalUser = true;
-    #password = "nixos"; # Overridden if sops is working
     shell = pkgs.zsh; # default shell
-
+    initialPassword = "nixos";
+    hashedPasswordFile = sopsHashedPasswordFile;
     openssh.authorizedKeys.keys = lib.lists.forEach pubKeys (key: builtins.readFile key);
 
     extraGroups = [
@@ -20,9 +24,13 @@ in
 
   };
 
+  sops.secrets."passwords/sam" = {
+    sopsFile = "${secretsFile}";
+    neededForUsers = true;
+  };
+
   programs.zsh.enable = true;
 
-  #home-manager.users.sam = 
   home-manager = {
     extraSpecialArgs = { inherit inputs; };
     users = {

hosts/fileserver/default.nix

@@ -41,13 +41,6 @@
 
   time.timeZone = "Europe/London";
 
-  i18n.defaultLocale = "en_GB.UTF-8";
-  console = {
-    font = "Lat2-Terminus16";
-    keyMap = "uk";
-    useXkbConfig = false; 
-  };
-
   programs.gnupg.agent = {
     enable = true;
     enableSSHSupport = true;

hosts/media/default.nix

@@ -1,32 +0,0 @@
-{ inputs, config, lib, pkgs, outputs,... }:
-
-{
-  imports =
-    [ 
-      # Import core options
-      ./hardware-configuration.nix
-      ../common/core
-
-      # Import optional options
-      ../common/optional/pipewire.nix
-      ../common/optional/hyprland.nix
-      ../common/optional/displayManager/sddm.nix
-      ../common/optional/openssh
-
-      # Create users for this host
-      ../common/users/sam
-
-    ];
-
-  nixpkgs = {
-      overlays = [
-        outputs.overlays.additions
-        outputs.overlays.modifications
-        outputs.overlays.unstable-packages
-      ];
-      config = {
-        allowUnfree = true;
-      };
-    };
-  
-  nix.settings.experimental-features = [ "nix-command" "flakes" ];

hosts/nixdev/default.nix

@@ -11,7 +11,7 @@
       ../common/optional/pipewire.nix
       ../common/optional/hyprland.nix
       ../common/optional/displayManager/sddm.nix
-      ../common/optional/openssh
+      ../common/optional/openssh.nix
 
       # Create users for this host
       ../common/users/sam
@@ -42,13 +42,6 @@
 
   time.timeZone = "Europe/London";
 
-  i18n.defaultLocale = "en_GB.UTF-8";
-  console = {
-    font = "Lat2-Terminus16";
-    keyMap = "uk";
-    useXkbConfig = false; 
-  };
-
   services.printing.enable = true;
 
   services.libinput.enable = true;

hosts/sparky/default.nix

@@ -0,0 +1,107 @@
+{ inputs, config, lib, pkgs, outputs,... }:
+let
+  sopsHashedPasswordFile = lib.optionalString (lib.hasAttr "sops-nix" inputs) config.sops.secrets."passwords/root".path;
+  secretsDirectory = builtins.toString inputs.nix-secrets;
+  secretsFile = "${secretsDirectory}/secrets.yaml";
+in
+{
+  imports =
+    [ 
+      # Disk configuration
+      inputs.disko.nixosModules.disko
+      (import ../common/disks/std-disk-config.nix { device = "/dev/vda"; })
+      ../common/optional/btrfs-impermanence.nix
+      inputs.impermanence.nixosModules.impermanence
+
+      # Create users for this host
+      ../common/users/media
+
+      # Import core options
+      ./hardware-configuration.nix
+      ../common/core
+
+      # Import optional options
+      ../common/optional/openssh.nix
+
+    ];
+
+  nixpkgs = {
+      overlays = [
+        outputs.overlays.additions
+        outputs.overlays.modifications
+        outputs.overlays.unstable-packages
+      ];
+      config = {
+        allowUnfree = true;
+      };
+    };
+
+  fileSystems."/persist".neededForBoot = true;
+  environment.persistence."/persist" = {
+    hideMounts = true;
+    directories = [
+      "/etc/nixos"
+      "/var/log"
+      "/var/lib/nixos"
+      "/var/lib/systemd/coredump"
+      "/etc/NetworkManager/system-connections"
+    ];
+    files = [
+      "/etc/ssh/ssh_host_ed25519_key"
+      "/etc/ssh/ssh_host_ed25519_key.pub"
+    ];
+    users.media= {
+        directories = [
+          "sync"
+          "keep"
+          ".ssh"
+          ".config/dconf"
+          ".config/cinnamon"
+          ".config/nemo"
+        ];
+        files = [
+        ];
+    };
+  };
+
+  users = {
+    mutableUsers = true;
+    extraUsers = {
+      root = {
+        hashedPasswordFile = sopsHashedPasswordFile;
+      };
+     };
+  };
+
+  boot = {
+    loader = {
+      systemd-boot.enable = true;
+      efi.canTouchEfiVariables = true;
+      timeout = 3;
+    };
+  };
+
+  networking = {
+    hostName = "sparky";
+    networkmanager.enable = true;
+    enableIPv6 = false;
+  };
+
+  services = {
+    qemuGuest.enable = true;
+  };
+  #services.libinput.enable = true;
+  #services.displayManager.defaultSession = "cinnamon";
+
+#	services.xserver = {
+#		enable = true;
+#		displayManager.lightdm.enable = true;
+#		desktopManager = {
+#			cinnamon.enable = true;
+#		};
+#	};
+#
+
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+  system.stateVersion = "23.11";
+}

hosts/sparky/hardware-configuration.nix

@@ -0,0 +1,24 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/profiles/qemu-guest.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "ahci" "xhci_pci" "virtio_pci" "sr_mod" "virtio_blk" ];
+  boot.initrd.kernelModules = [ "dm-snapshot" ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp1s0.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+}

justfile

@@ -4,15 +4,15 @@ SOPS_FILE := "../nix-secrets/secrets.yaml"
 default:
   @just --list
 
-# ensure the latest revisions of nix-secrets are used next time a rebuild occurs
-update-nix-secrets:
+# fetches from remote and updates flake.lock with latest revisions of nix-secrets for next time a rebuild occurs
+update-flake-secrets:
   (cd ../nix-secrets && git fetch && git rebase) || true
   nix flake lock --update-input nix-secrets
 
 # full system rebuild from flake (stages changes and automatically detects host)
 rebuild-system:
   git add *.nix
-  sudo nixos-rebuild switch --flake $HOME/nixos#$(hostname)
+  sudo nixos-rebuild switch --flake .#$(hostname)
 
 # updates all flake inputs for system
 update-flake:
@@ -23,9 +23,10 @@ edit-sops:
   echo "Editing {{SOPS_FILE}}"
   nix-shell -p sops --run "SOPS_AGE_KEY_FILE=~/.config/sops/age/keys.txt sops {{SOPS_FILE}}"
 
-# update 
-update-secrets:
+# update keys in secrets.yaml and push to remote
+update-sops-secrets:
   cd $HOME/nix-secrets && (\
     nix-shell -p sops --run "sops updatekeys -y secrets.yaml" && \
     git add -u && (git commit -m "updated secrets" || true) && git push \
   )
+

scripts/bootstrap.sh

@@ -12,87 +12,100 @@ for the root user.
 read -p "Confirm host had been setup using the above steps...(yes|no): " confirm
 [ "$confirm" != "yes" ] && echo "Exiting" && exit 0
 
-cd ~
-read -p "Enter hostname: " hostname
-read -p "Enter username: " username
-read -p "Enter ip address: " ip
+# Target host details
+#cd ~
+#read -p "Enter hostname: " hostname
+#read -p "Enter username: " username
+#read -p "Enter ip address: " ip
+#read -p "Enter nixosSystem to build, e.g. 'bootstrap': " config
+hostname="bootstrap"
+ip="192.168.122.192"
+config="bootstrap"
 
-KEY_DIR="$HOME/keys/$hostname/"
-mkdir -p $KEY_DIR
-ssh-copy-id -i "$(readlink -n "$HOME/.ssh/gitea.pub" )" "root@$ip"
+# Generate key name and dir
+HOST_KEY_DIR="$HOME/keys/hosts/$hostname"
+mkdir -p "$HOST_KEY_DIR"
 
-echo "Creating ssh keys for new host. Will create in current directory: "$KEY_DIR
-KEY_NAME="ssh_ed25519_key_$hostname"
+# Create ssh keys if not exists
+echo "Creating '$hostname' ssh keys"
+bash "/$HOME/nixos/scripts/generate_ssh_keys.sh" --type "host" --username "root" --hostname "$hostname"
 
-KNOWN_HOSTS=$(grep "$ip" ~/.ssh/known_hosts)
-confirm_delete=""
+# Delete key in known hosts if exists
+sed -i "/$ip/d" ~/.ssh/known_hosts 
 
-[ "$KNOWN_HOSTS" != "" ] && echo -e "Host found in: ~/.ssh/known_hosts\n\n$KNOWN_HOSTS\n" && read -p "Delete existing hosts from ~/.ssh/known_hosts? (yes|no) " confirm_delete
-[ "$confirm_delete" = "yes" ] && sed -i "/$ip/d" ~/.ssh/known_hosts 
+# Authorise source public key
+echo "Copying pubkey to target host"
+ssh-copy-id -i "$(readlink -f "$HOME/.ssh/id_ed25519.pub")" "root@$ip"
 
-overwrite=""
-[ -f "$KEY_DIR/$KEY_NAME" ] && read -p "Key exists, would you like to overwrite it? (yes|no) " overwrite
+# Generate age key from target host and user public ssh key
+echo "Generating age key from target host and user ssh key"
+nix-shell -p ssh-to-age --run "cat $HOST_KEY_DIR/ssh_host_ed25519_key.pub | ssh-to-age > $HOST_KEY_DIR/age_host_key"
+HOST_AGE_KEY=$(cat "$HOST_KEY_DIR/age_host_key")
+echo -e "Host age key:\n$HOST_AGE_KEY\n"
+echo "These keys needs to be inserted into .sops.yaml file. This will be prompted again later."
 
-[ "$overwrite" == "yes" ] && ssh-keygen -t ed25519 -f "$KEY_DIR/$KEY_NAME" -C "$hostname@$ip" -N ""
+# Create temp directory for ssh keys to be copied to host:
+temp=$(mktemp -d)
 
-echo "Copying ssh key to target host:"
-# Rsync currently not available in Nixos. Use scp instead.
-#rsync -av "ssh_ed25519_key_$hostname"* "root@$ip:/etc/ssh/"
-scp -i "$KEY_DIR/ssh_ed25519_key_$hostname"* "root@$ip:/etc/ssh/"
-[ $? != 0 ] && echo "Error copying keys to target host" && exit 1
+# Function to cleanup temporary directory on exit
+cleanup() {
+  rm -rf "$temp"
+}
+trap cleanup EXIT
 
-echo "Generating age key from ssh key"
-nix-shell -p ssh-to-age --run "cat $KEY_DIR/$KEY_NAME.pub | ssh-to-age > $KEY_DIR/age_key_$hostname"
-[ $? != 0 ] && echo "Error generating age key" && exit 1
+# Create the directory where sshd expects to find the host keys
+install -d -m755 "$temp/persist/etc/ssh"
 
-AGE_KEY=$(cat "$KEY_DIR/age_key_$hostname")
+cat "$HOST_KEY_DIR/ssh_host_ed25519_key" > "$temp/persist/etc/ssh/ssh_host_ed25519_key" 
+cat "$HOST_KEY_DIR/ssh_host_ed25519_key.pub" > "$temp/persist/etc/ssh/ssh_host_ed25519_key.pub" 
 
-echo -e "Age key:\n$AGE_KEY\n"
-echo "This needs to be inserted into .sops.yaml file."
+chmod 600 "$temp/persist/etc/ssh/ssh_host_ed25519_key"
+chmod 644 "$temp/persist/etc/ssh/ssh_host_ed25519_key.pub"
 
-# Install Nixos bootstrap
+# Install Nixos to target
 cd "$HOME/nixos"
-SHELL=/bin/sh nix run github:nix-community/nixos-anywhere -- --flake .#bootstrap root@"$ip" -i "$KEY_DIR/ssh_ed25519_key_$hostname"
+git add . && git commit -m "auto: bootstrapping $hostname" && git push
+[ $? != 0 ] && echo "Error commiting current changes" && exit 1
+
+SHELL=/bin/sh nix run github:nix-community/nixos-anywhere -- --extra-files "$temp" --flake .#"$config" root@"$ip" -i "$HOME/.ssh/id_ed25519"
 [ $? != 0 ] && echo "Error installing Nixos" && exit 1
 
+## Delete keys from local known_hosts
 echo "Deleting host from known_hosts"
 sed -i "/$ip/d" ~/.ssh/known_hosts
 
+# Check host OS has booted (and not booted back into live cd)
 while true;
 do
-  read -p "Confirm live CD has been removed... (yes|no)" confirm
+  read -p "Confirm live CD has been removed... (yes|no): " confirm
   [ "$confirm" = "yes" ] && break
 done
-
 echo "Waiting for $ip to come back online and port 22 to be open..."
-
 while ! ping -c 1 $ip &> /dev/null || ! nc -zvw3 $ip 22 &> /dev/null
 do
     echo "$ip is still offline or port 22 is not open. Checking again in 5 seconds..."
     sleep 5
 done
-
 echo "$ip is now online and port 22 is open!"
 
-echo "Configuring ssh keys on target host to enable connection to gitea:"
-ssh-copy-id -i "$HOME/.ssh/gitea.pub" "$username@$ip"
-read -r -d '' config << EOM
-Host git.bitlab21.com
-    IdentitiesOnly yes
-    StrictHostKeyChecking no
-    IdentityFile ~/.ssh/gitea
-EOM
+# Authorise source public key
+echo "Copying pubkey to target host"
+ssh-copy-id -i "$(readlink -f "$HOME/.ssh/id_ed25519.pub")" "root@$ip"
 
-# Append the string to file on target machine
-echo "$config" | ssh "$username@$ip" 'mkdir -p ~/.ssh/ && cat > ~/.ssh/config'
+# Copy deploy_key to target for personal repo authorisation
+scp -i "$(readlink -f "$HOME/.ssh/id_ed25519")" "$(readlink -f "$HOME/.ssh/deploy_key-ssh-ed25519")" "root@$ip:/persist/etc/ssh/deploy_key-ssh-ed25519"
 
 echo -e "
 Complete!
 
-Now add the age key to .sops.yaml, like this:
+Now add the new target host age key to .sops.yaml. This is needed to enable the
+new host to decrypt the secrets.yaml file from the ssh key we generated
+previously.
+
+Enter the details as following:
 keys:
 - &hosts:
-    - &$hostname $AGE_KEY
+    - &$hostname $HOST_AGE_KEY
 
 creation_rules:
   - path_regex: secrets.yaml$
@@ -100,13 +113,16 @@ creation_rules:
       - age:
         - *$hostname
 
-Then to update the keys for the secrets.yaml file, run:
-'sops --config .sops.yaml updatekeys secrets.yaml'
-or with nix-shell:
-'nix-shell -p sops --run 'sops --config .sops.yaml updatekeys secrets.yaml''
-then run 'nix flake lock --update-input nix-secrets $HOME/nixos'
-Finally, commit and push these changes to remote so they can be accessed on
-the new host.
+Then update (i.e. re-encrypt) the secrets.yaml file with the new keys, run:
+
+  'sops --config .sops.yaml updatekeys secrets.yaml' 
+
+or with just:
+
+  'just update-sops-secrets'
+
+Then commit and push these changes to remote so they can be accessed on the new
+host.
 "
 
 while true;
@@ -115,12 +131,8 @@ do
   [ "$confirm" = "yes" ] && break
 done
 
-echo "Copying gitea private ssh key to host"
-echo "New password is 'nixos'"
+ssh -i "$(readlink -f "$HOME/.ssh/id_ed25519")" "root@$ip" "nix-shell -p git --run 'git clone git@git.bitlab21.com:sam/nixos.git /persist/etc/nixos/'"
 
-rsync -av "$(readlink -n "$HOME/.ssh/gitea" )" "$username@$ip":~/.ssh/gitea
-ssh "$username@$ip" "nix-shell -p git --run 'git clone git@git.bitlab21.com:sam/nixos.git'"
-ssh "$username@$ip" "nix-shell -p git --run 'git clone git@git.bitlab21.com:sam/nix-secrets.git'"
+echo -e "###\nSuccessfully installed Nixos on the target host!\n###"
 
-echo "Successfully installed Nixos on the target host!"
-echo "Please remote into the new host and run 'sudo nixos-generate-config && cp /etc/nixos/hardware-configuration.nix /home/$username/nixos/hosts/$hostname/'"
+exit 0

scripts/generate_age_keys.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+echo "Generating an age key based on the new ssh_host_ed25519_key."
+
+target_key=$(ssh-keyscan -p $ssh_port -t ssh-ed25519 "$target_destination" 2>&1 | grep ssh-ed25519 | cut -f2- -d" ")
+age_key=$(nix shell nixpkgs#ssh-to-age.out -c sh -c "echo $target_key | ssh-to-age")
+
+if grep -qv '^age1' <<<"$age_key"; then
+	echo "The result from generated age key does not match the expected format."
+	echo "Result: $age_key"
+	echo "Expected format: age10000000000000000000000000000000000000000000000000000000000"
+	exit 1
+else
+	echo "$age_key"
+fi
+
+echo "Updating nix-secrets/.sops.yaml"
+cd ../nix-secrets
+
+SOPS_FILE=".sops.yaml"
+sed -i "{
+# Remove any * and & entries for this host
+/[*&]$target_hostname/ d;
+# Inject a new age: entry
+# n matches the first line following age: and p prints it, then we transform it while reusing the spacing
+/age:/{n; p; s/\(.*- \*\).*/\1$target_hostname/};
+# Inject a new hosts: entry
+/&hosts:/{n; p; s/\(.*- &\).*/\1$target_hostname $age_key/}
+}" $SOPS_FILE
+
+echo "Updating nix-secrets/.sops.yaml"
+cd -
+just rekey
+
+echo "Updating flake lock on source machine with new .sops.yaml info"
+nix flake lock --update-input nix-secrets

scripts/generate_ssh_keys.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+#
+# usage: ./generate_ssh_keys.sh --type "host" --username "root" --hostname "hostname"
+#
+
+while [[ $# -gt 0 ]]
+do
+    key="$1"
+
+    case $key in
+        --type)
+            type="$2"
+            shift # past argument
+            shift # past value
+            ;;
+        --username)
+            username="$2"
+            shift # past argument
+            shift # past value
+            ;;
+        --hostname)
+            hostname="$2"
+            shift # past argument
+            shift # past value
+            ;;
+        *)    # unknown option
+            echo "Unknown option $1"
+            exit 1
+            ;;
+    esac
+done
+
+if [[ -z "$type" || -z "$username" || -z "$hostname" ]]; then
+    echo "All arguments are not specified."
+    exit 1
+fi
+
+if [[ $type != "user" && $type != "host" ]]; then
+    echo "Invalid type. It should be either 'user' or 'host'"
+    exit 1
+fi
+
+HOST_KEY_DIR="$HOME/keys/hosts/$hostname"
+USER_KEY_DIR="$HOME/keys/users/$username"
+mkdir -p "$HOST_KEY_DIR" "$USER_KEY_DIR"
+
+if [[ $type == "user" ]]; then
+    keyfile="id_ed25519"
+    name="$username"
+else
+    keyfile="ssh_host_ed25519_key"
+    name="root@$hostname"
+fi
+
+keydir=$([[ $type == "user" ]] && echo "$USER_KEY_DIR" || echo "$HOST_KEY_DIR")
+fullpath="$keydir/$keyfile"
+overwrite=""
+[ -f "$fullpath" ] && read -p "Target key '$fullpath' already exists, would you like to overwrite it? (yes|no) " overwrite
+[ "$overwrite" = "yes" ] || [ -z "$overwrite" ] && ssh-keygen -t ed25519 -f "$fullpath" -C "$name" -N ""
+