chore: change username to 'user', remove default ssh public key

Author: ryan4yin

README.md

@@ -4,7 +4,14 @@ This repo contains the code to get NixOS running on LicheePi 4A.
 
 ![neofetch](./_img/nixos-licheepi-fastfetch.png)
 
-Default user: `lp4a`, default password: `lp4a`.
+### Default login (development image)
+
+| | |
+| --- | --- |
+| User | `user` |
+| Password | `lp4a` |
+
+Change the password and SSH settings before exposing the board to any network you do not fully trust.
 
 ## Build u-boot & sdImage
 
@@ -67,10 +74,10 @@ Then, use the following command to flash the image into the board's eMMC:
 
 ```bash
 # upload the sdImage to the NixOS system on the board
-scp nixos-lp4a.img lp4a@<ip-of-your-board>:~/
+scp nixos-lp4a.img user@<ip-of-your-board>:~/
 
 # login to the board via ssh or serial port
-ssh lp4a@<ip-of-your-board>
+ssh user@<ip-of-your-board>
 
 # check all the block devices
 # you should see mmcblk0(eMMC) & mmcblk1(SD card)

demo/user-group.nix

@@ -1,13 +1,14 @@
-# NOTE: make sure to update your password and public key in this file
-# NOTE: to generate a hashed password, you can use the `mkpasswd` command.
+# Default account: Unix user `user`, password lp4a (see README.md).
+# Public key below is a valid-format placeholder; the private key is not in this repo — replace
+# with your own `ssh-ed25519` line (from ~/.ssh/id_ed25519.pub or similar) before relying on SSH keys.
+# To generate a new hashed password: `mkpasswd`.
 
 let
-  username = "lp4a";
+  username = "user";
   hostname = "licheepi4a";
-  # default password is "lp4a"
   hashedPassword = "$y$j9T$mTIe/80yqh53danHYbUkP1$2TYCUsFKnkBnHG6pArOv9t.e2ofxO.j1MIt/6rB05P1";
-  # default public key is my own, change it to your own public key!
-  publickey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGfKhCawAW4dQz5OtDGZIlKvuNx3+Iovw5X/251Wfxnq user@dev";
+  # Placeholder only (no matching private key shipped here).
+  publickey = "ssh-ed25519 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX demo-placeholder-replace-me";
 in
 {
   networking.hostName = hostname;
@@ -28,7 +29,6 @@ in
     ];
   };
 
-  # also add public key to root user
   users.users.root.openssh.authorizedKeys.keys = [
     publickey
   ];

modules/user-group.nix

@@ -1,13 +1,11 @@
-# NOTE: make sure to update your password and public key in this file
-# NOTE: to generate a hashed password, you can use the `mkpasswd` command.
+# Default account: Unix user `user`, password lp4a (see README.md).
+# Add SSH keys under users.users.<name>.openssh.authorizedKeys.keys if you want key login.
+# To generate a new hashed password: `mkpasswd`.
 
 let
   username = "user";
   hostname = "licheepi4a";
-  # default password is "lp4a"
   hashedPassword = "$y$j9T$mTIe/80yqh53danHYbUkP1$2TYCUsFKnkBnHG6pArOv9t.e2ofxO.j1MIt/6rB05P1";
-  # default public key is my own, change it to your own public key!
-  publickey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGfKhCawAW4dQz5OtDGZIlKvuNx3+Iovw5X/251Wfxnq user@dev";
 in {
   networking.hostName = hostname;
 
@@ -17,13 +15,5 @@ in {
     isNormalUser = true;
     home = "/home/${username}";
     extraGroups = ["users" "networkmanager" "wheel" "docker"];
-    openssh.authorizedKeys.keys = [
-      publickey
-    ];
   };
-
-  # also add public key to root user
-  users.users.root.openssh.authorizedKeys.keys = [
-    publickey
-  ];
 }