daemon: Client settings no longer override daemon settings.

Fixes <http://bugs.gnu.org/20217>.

* nix/libstore/worker-protocol.hh (PROTOCOL_VERSION): Bump to 0x161.
* nix/nix-daemon/nix-daemon.cc (performOp): "build-max-jobs",
"build-max-silent-time", and "build-cores" are no longer read upfront;
instead, read them from the key/value list at the end.
* nix/nix-daemon/guix-daemon.cc (main): Explicitly set
'settings.maxBuildJobs'.
* guix/store.scm (%protocol-version): Bump to #x161.
(set-build-options): #:max-build-jobs, #:max-silent-time, and
 #:build-cores now default to #f.  Adjust handshake to new protocol.
* tests/store.scm ("build-cores"): New test.
* tests/guix-daemon.sh: Add test for default "build-cores" value.

1 files changed, 3 insertions, 2 deletions

diff --git a/nix/nix-daemon/guix-daemon.cc b/nix/nix-daemon/guix-daemon.cc
index d5d33a587a..aa47a290d2 100644
--- a/nix/nix-daemon/guix-daemon.cc
+++ b/nix/nix-daemon/guix-daemon.cc
@@ -1,5 +1,5 @@
 /* GNU Guix --- Functional package management for GNU
-   Copyright (C) 2012, 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+   Copyright (C) 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
 
    This file is part of GNU Guix.
 
@@ -301,8 +301,9 @@ main (int argc, char *argv[])
   /* Turn automatic deduplication on by default.  */
   settings.autoOptimiseStore = true;
 
-  /* Default to using as many cores as possible.  */
+  /* Default to using as many cores as possible and one job at a time.  */
   settings.buildCores = 0;
+  settings.maxBuildJobs = 1;
 
   argvSaved = argv;