From 6021691b3f0e2e07f8a6c2ea7ff5a4c2037f5d5d Mon Sep 17 00:00:00 2001
From: Sovran Systems <99053422+naturallaw777@users.noreply.github.com>
Date: Mon, 10 Aug 2026 17:11:30 -0500
Subject: [PATCH] =?UTF-8?q?Mempool:=20fix=20npmDeps=20fetcher=20=E2=80=94?=
 =?UTF-8?q?=20postUnpack=20instead=20of=20sourceRoot,=20postPatch=20instea?=
 =?UTF-8?q?d=20of=20patches?=
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The `patches` attribute was being applied inside the npmDeps
fixed-output derivation where patch runs interactively and fails.
sourceRoot also caused the deps fetcher to hash a different tree than
expected. Now:

- postUnpack cds into the subdir for both the fetcher and main build
- postPatch applies the mining-pool patch only in the main build
- npmDepsHash values remain placeholders (lib.fakeHash)
---
 packages/mempool/default.nix | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/packages/mempool/default.nix b/packages/mempool/default.nix
index a04abbe..192129c 100644
--- a/packages/mempool/default.nix
+++ b/packages/mempool/default.nix
@@ -80,19 +80,26 @@ in rec {
     pname = "mempool-backend";
     inherit version src;
 
-    sourceRoot = "source/backend";
+    # Use postUnpack (not sourceRoot) so the npmDeps fixed-output
+    # derivation hashes the same unpacked tree as the main build.
+    postUnpack = ''
+      cd source/backend
+    '';
 
     # Placeholder: build once, then replace with the hash from the
     # "hash mismatch" error output.
     npmDepsHash = lib.fakeHash;
 
-    patches = [ ./0001-allow-disabling-mining-pool-fetching.patch ];
-
     nativeBuildInputs = [
       makeWrapper
       rsync
     ];
 
+    # Apply patches only in the main build, not in the npmDeps fetcher.
+    postPatch = ''
+      patch -p1 < ${./0001-allow-disabling-mining-pool-fetching.patch}
+    '';
+
     dontNpmBuild = true;
     dontNpmInstall = true;
 
@@ -141,7 +148,11 @@ in rec {
     pname = "mempool-frontend";
     inherit version src;
 
-    sourceRoot = "source/frontend";
+    # Use postUnpack (not sourceRoot) so the npmDeps fixed-output
+    # derivation hashes the same unpacked tree as the main build.
+    postUnpack = ''
+      cd source/frontend
+    '';
 
     # Placeholder: build once, then replace with the hash from the
     # "hash mismatch" error output.