From b0328c244dd15da9e45f4e95d900c81fe0c47dda Mon Sep 17 00:00:00 2001
From: Renzo Carbonara <gnuk0001@gmail.com>
Date: Tue, 9 Jan 2018 22:40:07 +0100
Subject: nix.conf: builders-use-substitutes

Fixes #937
---
 src/build-remote/build-remote.cc | 6 ++++--
 src/libstore/globals.hh          | 5 +++++
 2 files changed, 9 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/build-remote/build-remote.cc b/src/build-remote/build-remote.cc
index 445006b327fd..df579729af29 100644
--- a/src/build-remote/build-remote.cc
+++ b/src/build-remote/build-remote.cc
@@ -218,9 +218,11 @@ connected:
             signal(SIGALRM, old);
         }
 
+        auto substitute = settings.buildersUseSubstitutes ? Substitute : NoSubstitute;
+
         {
             Activity act(*logger, lvlTalkative, actUnknown, fmt("copying dependencies to '%s'", storeUri));
-            copyPaths(store, ref<Store>(sshStore), inputs, NoRepair, NoCheckSigs);
+            copyPaths(store, ref<Store>(sshStore), inputs, NoRepair, NoCheckSigs, substitute);
         }
 
         uploadLock = -1;
@@ -240,7 +242,7 @@ connected:
         if (!missing.empty()) {
             Activity act(*logger, lvlTalkative, actUnknown, fmt("copying outputs from '%s'", storeUri));
             setenv("NIX_HELD_LOCKS", concatStringsSep(" ", missing).c_str(), 1); /* FIXME: ugly */
-            copyPaths(ref<Store>(sshStore), store, missing, NoRepair, NoCheckSigs);
+            copyPaths(ref<Store>(sshStore), store, missing, NoRepair, NoCheckSigs, substitute);
         }
 
         return;
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index ae4b78a018e0..af72f7b1e35d 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -138,6 +138,11 @@ public:
     Setting<std::string> builders{this, "@" + nixConfDir + "/machines", "builders",
         "A semicolon-separated list of build machines, in the format of nix.machines."};
 
+    Setting<bool> buildersUseSubstitutes{this, false, "builders-use-substitutes",
+        "Whether build machines should use their own substitutes for obtaining "
+        "build dependencies if possible, rather than waiting for this host to "
+        "upload them."};
+
     Setting<off_t> reservedSize{this, 8 * 1024 * 1024, "gc-reserved-space",
         "Amount of reserved disk space for the garbage collector."};
 
-- 
cgit 1.4.1