From 405ec170222740b2fd44d077275d37b4ea6124a7 Mon Sep 17 00:00:00 2001
From: Rhys Arkins <rhys@arkins.net>
Date: Sun, 8 Oct 2023 15:18:34 +0200
Subject: [PATCH] fix(nix): Allow nixpkgs with no ref (#25068)

---
 lib/modules/manager/nix/extract.spec.ts | 14 ++++++++++++--
 lib/modules/manager/nix/extract.ts      |  2 +-
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/lib/modules/manager/nix/extract.spec.ts b/lib/modules/manager/nix/extract.spec.ts
index e9a88ef8f9b90c..9645744c2a9208 100644
--- a/lib/modules/manager/nix/extract.spec.ts
+++ b/lib/modules/manager/nix/extract.spec.ts
@@ -52,7 +52,7 @@ describe('modules/manager/nix/extract', () => {
     ]);
   });
 
-  it('ignores nixpkgs with no explicit ref', () => {
+  it('includes nixpkgs with no explicit ref', () => {
     const content = `{
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs";
@@ -61,6 +61,16 @@ describe('modules/manager/nix/extract', () => {
 
     const res = extractPackageFile(content);
 
-    expect(res).toBeNull();
+    expect(res).toMatchObject({
+      deps: [
+        {
+          currentValue: undefined,
+          datasource: 'git-refs',
+          depName: 'nixpkgs',
+          packageName: 'https://github.com/NixOS/nixpkgs',
+          versioning: 'nixpkgs',
+        },
+      ],
+    });
   });
 });
diff --git a/lib/modules/manager/nix/extract.ts b/lib/modules/manager/nix/extract.ts
index d883e5b9ba49ca..5170e23a07dfe0 100644
--- a/lib/modules/manager/nix/extract.ts
+++ b/lib/modules/manager/nix/extract.ts
@@ -3,7 +3,7 @@ import { GitRefsDatasource } from '../../datasource/git-refs';
 import { id as nixpkgsVersioning } from '../../versioning/nixpkgs';
 import type { PackageDependency, PackageFileContent } from '../types';
 
-const nixpkgsRegex = regEx(/"github:nixos\/nixpkgs\/(?<ref>[a-z0-9-.]+)"/i);
+const nixpkgsRegex = regEx(/"github:nixos\/nixpkgs(\/(?<ref>[a-z0-9-.]+))?"/i);
 
 export function extractPackageFile(content: string): PackageFileContent | null {
   const deps: PackageDependency[] = [];