From b3550d9179611692a4e27fbe4e5f493f4e8713e3 Mon Sep 17 00:00:00 2001
From: Adam Joseph <adam@westernsemico.com>
Date: Fri, 16 Sep 2022 00:47:54 -0700
Subject: [PATCH] libexpr/fetchurl.nix: allow __impure fetch

This commit adds an optional `__impure` parameter to fetchurl.nix, which allows
the caller to use `libfetcher`'s fetcher in an impure derivation.  This allows
nixpkgs' patch-normalizing fetcher (fetchpatch) to be rewritten to use nix's
internal fetchurl, thereby eliminating the awkward "you can't use fetchpatch
here" banners scattered all over the place.

See also: https://github.com/NixOS/nixpkgs/pull/188587
---
 src/libexpr/fetchurl.nix | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/libexpr/fetchurl.nix b/src/libexpr/fetchurl.nix
index 02531103b..38815fcc4 100644
--- a/src/libexpr/fetchurl.nix
+++ b/src/libexpr/fetchurl.nix
@@ -12,13 +12,13 @@
 , executable ? false
 , unpack ? false
 , name ? baseNameOf (toString url)
+, __impure ? false
 }:
 
-derivation {
+derivation ({
   builder = "builtin:fetchurl";
 
   # New-style output content requirements.
-  inherit outputHashAlgo outputHash;
   outputHashMode = if unpack || executable then "recursive" else "flat";
 
   inherit name url executable unpack;
@@ -38,4 +38,6 @@ derivation {
 
   # To make "nix-prefetch-url" work.
   urls = [ url ];
-}
+} // (if __impure
+      then { inherit __impure; }
+      else { inherit outputHashAlgo outputHash; }))