From ea9aca2b069376a6fe50da32a487c58e52e66474 Mon Sep 17 00:00:00 2001
From: Georges Dubus <georges.dubus@gmail.com>
Date: Fri, 3 Jul 2020 14:21:31 +0200
Subject: [PATCH] Don't use read-only mode for nix build --dry-run

In dry run mode, new derivations can't be create, so running the command on anything that has not been evaluated before results in an error message of the form `don't know how to build these paths (may be caused by read-only store access)`.

For comparison, the classical `nix-build --dry-run` doesn't use read-only mode.

Closes #1795
---
 src/nix/installables.cc | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/src/nix/installables.cc b/src/nix/installables.cc
index 708a0dc888e0..0f846a8be29d 100644
--- a/src/nix/installables.cc
+++ b/src/nix/installables.cc
@@ -257,9 +257,6 @@ std::shared_ptr<Installable> parseInstallable(
 Buildables build(ref<Store> store, RealiseMode mode,
     std::vector<std::shared_ptr<Installable>> installables)
 {
-    if (mode != Build)
-        settings.readOnlyMode = true;
-
     Buildables buildables;
 
     std::vector<StorePathWithOutputs> pathsToBuild;