Add support for non-nixos systems

I run Debian on my Thinkpad and wanted to take advantage of nix on there
without also installing NixOS there, so here is added support for it.

README.md

@@ -47,6 +47,7 @@ modify and share this configuration to your heart's content, no attribution requ
 ```
 
 ## Installing
+### NixOS
 This configuration uses impermanence with btrfs snapshots so you'll have to partition
 your system in a certain way.
 
@@ -75,3 +76,8 @@ in the `secrets/{user}` directory as `pass`.
 
 Finally, in the config directory run `nixos-install --flake '.#'`, reboot and you're done.
 
+### Non-NixOS
+Run the `non-nixos-install.sh` script. It will install both home-manager and nix.
+Your user is assumed to be called "blank". You need to replace every instance of it
+in case you want to use a different username.
+

non-nixos-install.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env sh
+
+# This script sets up nix and home-manager for distributions that are not NixOS.
+
+set -e
+BASE_PATH="$(dirname "$(realpath "$0")")"
+
+if [ ! -d "/nix" ]; then
+    # Do multi-user installation
+    sh <(curl -L https://nixos.org/nix/install) --daemon
+    nix-channel --add https://nixos.org/channels/nixpkgs-unstable nixpkgs
+fi
+
+if [ ! -x "$HOME/.nix-profile/bin/home-manager" ]; then
+    ln -svf "$BASE_PATH/users/blank/home-manager" "$HOME/.config/home-manager"
+    ln -svf "$BASE_PATH/users/blank/nixpkgs" "$HOME/.config/nixpkgs"
+
+    nix-channel --add https://github.com/nix-community/home-manager/archive/master.tar.gz home-manager
+    nix-channel --update
+    nix-shell '<home-manager>' -A install
+fi
+

users/blank/README.md

@@ -0,0 +1,4 @@
+This user is a standalone home-manager user which I use for
+systems that are not NixOS but still make use of home-manager.
+You should not import this user when running NixOS.
+

users/blank/home-manager/home.nix

@@ -0,0 +1,30 @@
+{ config, pkgs, ... }:
+
+{
+  home.username = "blank";
+  home.homeDirectory = "/home/blank";
+  home.stateVersion = "24.05";
+
+  /*
+  home.packages = with pkgs; [
+    nvim
+  ];
+  */
+
+  home.file.".zshenv" = {
+    text = "source ~/.nix-profile/etc/profile.d/hm-session-vars.sh";
+  };
+
+  home.sessionVariables = {
+    EDITOR = "nvim";
+    ZDOTDIR = "${config.xdg.configHome}/zsh";
+  };
+
+  imports = [
+    ./packages/nvim/neovim.nix 
+    ./packages/zsh/zsh-home.nix
+  ];
+
+  programs.home-manager.enable = true;
+}
+

users/blank/home-manager/packages/nvim

@@ -0,0 +1 @@
+../../../hu/packages/nvim

users/blank/home-manager/packages/zsh

@@ -0,0 +1 @@
+../../../hu/packages/zsh

users/blank/nixpkgs/config.nix

@@ -0,0 +1,4 @@
+{
+  allowUnfree = true;
+}
+

users/hu/packages/zsh/config/conf.d/completions.zsh

@@ -1,8 +1,10 @@
 #!/usr/bin/env zsh
 
-if [ -z "$FZF_TAB_FILE" ] && [ ! -d "$HOME/.cache/fzf-tab" ]; then
+if [ -z "$FZF_TAB_FILE" ]; then
+    if [ ! -d "$HOME/.cache/fzf-tab" ]; then
         echo "Installing fzf-tab"
         git clone "https://github.com/Aloxaf/fzf-tab" "$HOME/.cache/fzf-tab" 
+    fi
     FZF_TAB_FILE="$HOME/.cache/fzf-tab/fzf-tab.plugin.zsh"
 fi
 

users/hu/packages/zsh/config/conf.d/path.zsh

@@ -8,6 +8,10 @@ add_to_path() {
 
 add_to_path "$HOME/.local/bin"
 
+if [ -f "/etc/profile.d/nix.sh" ]; then
+    source /etc/profile.d/nix.sh
+fi
+
 # Language package mangers
 if [ -n "$(command -v go)" ]; then 
     export GOPATH="$HOME/.local/share/go"

users/hu/packages/zsh/zsh-home.nix

@@ -1,15 +1,36 @@
-{ pkgs, ... }:
+{ config, pkgs, ... }:
 
 {
-  home.file."/home/hu/.config/zsh/conf.d" = {
+  home.packages = with pkgs; [
+    fzf
+    zsh-fzf-tab
+    zsh-completions
+    zsh-autosuggestions
+    zsh-syntax-highlighting
+    nix-zsh-completions
+    thefuck
+  ];
+
+  home.file."${config.xdg.configHome}/zsh/conf.d" = {
     source = ./config/conf.d;
     recursive = true;
   };
-  home.file."/home/hu/.config/zsh/.zshrc" = {
+
+  home.file."${config.xdg.configHome}/zsh/.zshrc" = {
     text = ''
       #!/usr/bin/env zsh
       SYNTAX_FILE="${pkgs.zsh-syntax-highlighting}/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh"
+
+      # On systems that are not on glibc 2.38, loading fzf-tab will fail. This prevents that.
+      if [ -f "/lib/x86_64-linux-gnu/libc.so.6" ]; then
+        GLIBC_VERSION="$(/lib/x86_64-linux-gnu/libc.so.6 | head -n1 | sed -e 's/.* //g' | rev | cut -c2- | rev)"
+        if [ "$GLIBC_VERSION" = "2.38" ]; then
           FZF_TAB_FILE="${pkgs.zsh-fzf-tab}/share/fzf-tab/fzf-tab.plugin.zsh"
+        fi
+      else
+        FZF_TAB_FILE="${pkgs.zsh-fzf-tab}/share/fzf-tab/fzf-tab.plugin.zsh"
+      fi
+
       AUTOSUGGEST_FILE="${pkgs.zsh-autosuggestions}/share/zsh-autosuggestions/zsh-autosuggestions.zsh"
     '' + (builtins.readFile config/.zshrc);
   };

users/hu/packages/zsh/zsh.nix

@@ -2,18 +2,5 @@
 
 {
   programs.zsh.enable = true;
-  environment.variables = {
-    ZDOTDIR = "${config.users.users.hu.home}/.config/zsh";
-  };
-
-  environment.systemPackages = with pkgs; [
-    fzf
-    zsh-fzf-tab
-    zsh-completions
-    zsh-autosuggestions
-    zsh-syntax-highlighting
-    nix-zsh-completions
-    thefuck
-  ];
 }