From 174b68a2a2e9e58fa1a1a0036858a566c51684dc Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 2 May 2017 12:16:29 +0200
Subject: [PATCH] build-hook: If there are no machines defined, quit
 permanently

---
 src/build-remote/build-remote.cc |  5 +++++
 src/libstore/build.cc            | 11 +++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/build-remote/build-remote.cc b/src/build-remote/build-remote.cc
index acf571ff1..388f1e046 100644
--- a/src/build-remote/build-remote.cc
+++ b/src/build-remote/build-remote.cc
@@ -150,6 +150,11 @@ int main (int argc, char * * argv)
         auto machines = readConf();
         debug("got %d remote builders", machines.size());
 
+        if (machines.empty()) {
+            std::cerr << "# decline-permanently\n";
+            return;
+        }
+
         string drvPath;
         string storeUri;
         for (string line; getline(cin, line);) {
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index a9649ea37..e756d3377 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1598,8 +1598,15 @@ HookReply DerivationGoal::tryBuildHook()
 
         debug(format("hook reply is ‘%1%’") % reply);
 
-        if (reply == "decline" || reply == "postpone")
-            return reply == "decline" ? rpDecline : rpPostpone;
+        if (reply == "decline")
+            return rpDecline;
+        else if (reply == "decline-permanently") {
+            settings.useBuildHook = false;
+            worker.hook = 0;
+            return rpDecline;
+        }
+        else if (reply == "postpone")
+            return rpPostpone;
         else if (reply != "accept")
             throw Error(format("bad hook reply ‘%1%’") % reply);