From 542e3969499d184ba39fd7b3c201ead5bddfdd76 Mon Sep 17 00:00:00 2001
From: Robert Hensing <robert@roberthensing.nl>
Date: Wed, 31 May 2023 16:31:11 +0200
Subject: [PATCH] Add lower bound to lib version

---
 flake.nix |  9 ++++++++-
 lib.nix   | 22 ++++++++++++++++++++--
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/flake.nix b/flake.nix
index 190d8f2..8b934f6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,7 +6,14 @@
   };
 
   outputs = { nixpkgs-lib, ... }: {
-    lib = import ./lib.nix { inherit (nixpkgs-lib) lib; };
+    lib = import ./lib.nix {
+      inherit (nixpkgs-lib) lib;
+      # Extra info for version check message
+      revInfo =
+        if nixpkgs-lib?rev
+        then " (nixpkgs-lib.rev: ${nixpkgs-lib.rev})"
+        else "";
+    };
     templates = {
       default = {
         path = ./template/default;
diff --git a/lib.nix b/lib.nix
index f99f0cc..908ebfa 100644
--- a/lib.nix
+++ b/lib.nix
@@ -1,4 +1,8 @@
-{ lib }:
+{ lib
+  # Optionally a string with extra version info to be included in the error message
+  # in case is lib is out of date. Empty or starts with space.
+, revInfo ? ""
+}:
 let
   inherit (lib)
     mkOption
@@ -207,5 +211,19 @@ let
       lib.setDefaultModuleLocation modulePath (import modulePath staticArgs);
   };
 
+  # A best effort, lenient estimate. Please use a recent nixpkgs lib if you
+  # override it at all.
+  minVersion = "22.05";
+
 in
-flake-parts-lib
+
+if builtins.compareVersions lib.version minVersion <= 0
+then
+  abort ''
+    The nixpkgs-lib dependency of flake-parts was overridden but is too old.
+    The minimum supported version of nixpkgs-lib is ${minVersion},
+    but the actual version is ${lib.version}${revInfo}.
+  ''
+else
+
+  flake-parts-lib