From fcdab6a62df47e0b23ef9bd0e4ff2a9452277f71 Mon Sep 17 00:00:00 2001
From: Robert Helgesson <robert@rycee.net>
Date: Thu, 15 Aug 2019 23:23:43 +0200
Subject: [PATCH] install: restrict to nix-shell

This commit adds a "build" command to the install derivation that
tells the user that `nix-shell` should be used.

A derivation attribute `shellHookOnly = true` is also added with the
intent to indicate that the shell hook is the entire point of the
derivation.
---
 home-manager/install.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/home-manager/install.nix b/home-manager/install.nix
index 8abf6af9..c58c0ba7 100644
--- a/home-manager/install.nix
+++ b/home-manager/install.nix
@@ -6,6 +6,7 @@ runCommand
     propagatedBuildInputs = [ home-manager ];
     preferLocalBuild = true;
     allowSubstitutes = false;
+    shellHookOnly = true;
     shellHook = ''
       confFile="''${XDG_CONFIG_HOME:-$HOME/.config}/nixpkgs/home.nix"
 
@@ -53,4 +54,7 @@ runCommand
       fi
     '';
   }
-  ""
+  ''
+    echo This derivation is not buildable, instead run it using nix-shell.
+    exit 1
+  ''