Use variables where possible

Path to openssh package is accessed using ${pkgs.openssh}
    Variable for ssh socket is set based on the built in XDG_RUNTIME_DIR variable

configuration.nix

@@ -39,6 +39,7 @@ in
       EDITOR = "nvim";
       VISUAL = "nvim";
       SUDO_EDITOR = "nvim";
+      TERMINAL = "kitty";
     };
     # remove nano from default packages
     defaultPackages = [ pkgs.perl pkgs.rsync pkgs.strace ];
@@ -156,6 +157,17 @@ in
   # Enable thumbnailer service
   services.tumbler.enable = true;
 
+  virtualisation = {
+    podman = {
+      enable = true;
+      # clean up regularly
+      autoPrune = {
+        enable = true;
+        dates = "weekly";
+      };
+    };
+  };
+
   # Open ports in the firewall.
   # networking.firewall.allowedTCPPorts = [ ... ];
   # networking.firewall.allowedUDPPorts = [ ... ];

home-manager.nix

@@ -71,7 +71,7 @@ in
           Service = {
             Type = "simple";
             Environment = "SSH_AUTH_SOCK=%t/ssh-agent.socket";
-            ExecStart = "/run/current-system/sw/bin/ssh-agent -D -a $SSH_AUTH_SOCK";
+            ExecStart = "${pkgs.openssh}/bin/ssh-agent -D -a $SSH_AUTH_SOCK";
           };
           Install = {
             WantedBy = [ "default.target" ];
@@ -80,7 +80,7 @@ in
       };
       # user environment variables
       sessionVariables = {
-        SSH_AUTH_SOCK = "/run/user/1000/ssh-agent.socket";
+        SSH_AUTH_SOCK = "${builtins.getEnv"XDG_RUNTIME_DIR"}/ssh-agent.socket";
       };
     };
 

system-packages.nix

@@ -23,6 +23,7 @@
     polkit_gnome # graphical authentication agent for polkit
     freetype # font rendering and configuration
     open-vm-tools # running on vmware
+    podman # containers
   ];
 
   fonts.fonts = with pkgs; [