From 3e664255d65b04d380bd594c2072985994e77e43 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Mon, 18 Aug 2025 16:50:20 +0200
Subject: [PATCH] speed up tests by doing reflink copies

---
 pkgs/testing/flake-module.nix            | 5 ++---
 pkgs/testing/nixos_test_lib/nix_setup.py | 4 ++--
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/pkgs/testing/flake-module.nix b/pkgs/testing/flake-module.nix
index 235514393..3772259e9 100644
--- a/pkgs/testing/flake-module.nix
+++ b/pkgs/testing/flake-module.nix
@@ -15,8 +15,7 @@
           mkdir -p "$CLAN_TEST_STORE/nix/store"
           mkdir -p "$CLAN_TEST_STORE/nix/var/nix/gcroots"
           if [[ -n "''${closureInfo-}" ]]; then
-            # ${pkgs.findutils}/bin/xargs ${pkgs.xcp}/bin/xcp --recursive --target-directory "$CLAN_TEST_STORE/nix/store"  < "$closureInfo/store-paths"
-            ${pkgs.findutils}/bin/xargs ${pkgs.coreutils}/bin/cp --recursive --target "$CLAN_TEST_STORE/nix/store"  < "$closureInfo/store-paths"
+            ${pkgs.findutils}/bin/xargs ${pkgs.xcp}/bin/xcp --recursive --target-directory "$CLAN_TEST_STORE/nix/store"  < "$closureInfo/store-paths"
             ${pkgs.nix}/bin/nix-store --load-db --store "$CLAN_TEST_STORE" < "$closureInfo/registration"
           fi
         '';
@@ -39,7 +38,7 @@
           ];
           postPatch = ''
             substituteInPlace nixos_test_lib/nix_setup.py \
-              --replace '@cp@' '${pkgs.coreutils}/bin/cp' \
+              --replace '@xcp@' '${pkgs.xcp}/bin/xcp' \
               --replace '@nix-store@' '${pkgs.nix}/bin/nix-store' \
               --replace '@xargs@' '${pkgs.findutils}/bin/xargs'
           '';
diff --git a/pkgs/testing/nixos_test_lib/nix_setup.py b/pkgs/testing/nixos_test_lib/nix_setup.py
index 5e0ebc8dd..e5fe50d9b 100644
--- a/pkgs/testing/nixos_test_lib/nix_setup.py
+++ b/pkgs/testing/nixos_test_lib/nix_setup.py
@@ -5,7 +5,7 @@ import subprocess
 from pathlib import Path
 
 # These paths will be substituted during package build
-CP_BIN = "@cp@"
+XCP_BIN = "@xcp@"
 NIX_STORE_BIN = "@nix-store@"
 XARGS_BIN = "@xargs@"
 
@@ -52,7 +52,7 @@ def setup_nix_in_nix(closure_info: str | None) -> None:
                 subprocess.run(  # noqa: S603
                     [
                         XARGS_BIN,
-                        CP_BIN,
+                        XCP_BIN,
                         "--recursive",
                         "--target-directory",
                         f"{tmpdir}/store/nix/store",