From 5010678492eddb9f6d076082bd912d726abf5e82 Mon Sep 17 00:00:00 2001
From: Yueh-Shun Li <shamrocklee@posteo.net>
Date: Wed, 13 Mar 2024 19:38:07 +0800
Subject: [PATCH 1/2] checkpointBuildTools.prepareCheckpointBuild: stop at
 install

Switch off phases following installPhase, including fixupPhase,
installCheckPhase, distPhase and postPhases.
---
 pkgs/build-support/checkpoint-build.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/build-support/checkpoint-build.nix b/pkgs/build-support/checkpoint-build.nix
index c9bee45005a1..f1202ca1ce0a 100644
--- a/pkgs/build-support/checkpoint-build.nix
+++ b/pkgs/build-support/checkpoint-build.nix
@@ -53,7 +53,12 @@ rec {
       mkdir -p $out/outputs
       cp -r ./* $out/outputs/
       runHook postCheckpointInstall
+      unset postPhases
     '';
+
+    dontFixup = true;
+    doInstallCheck = false;
+    doDist = false;
   });
 
   /* Build a derivation based on the checkpoint output generated by

From 05491696c54969386968d43771db19ffb36f689a Mon Sep 17 00:00:00 2001
From: Yueh-Shun Li <shamrocklee@posteo.net>
Date: Wed, 13 Mar 2024 23:16:06 +0800
Subject: [PATCH 2/2] hello: add postInstallCheck

Set doInstallCheck = true.
Test the existence of main program in postInstallCheck.
---
 pkgs/by-name/he/hello/package.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/by-name/he/hello/package.nix b/pkgs/by-name/he/hello/package.nix
index f1b056faf640..68fdcf7e408c 100644
--- a/pkgs/by-name/he/hello/package.nix
+++ b/pkgs/by-name/he/hello/package.nix
@@ -18,6 +18,13 @@ stdenv.mkDerivation (finalAttrs: {
 
   doCheck = true;
 
+  doInstallCheck = true;
+
+  # Give hello some install checks for testing purpose.
+  postInstallCheck = ''
+    stat "''${!outputBin}/bin/${finalAttrs.meta.mainProgram}"
+  '';
+
   passthru.tests = {
     version = testers.testVersion { package = hello; };