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.

6 files changed, 95 insertions, 18 deletions

diff --git a/guix/store.scm b/guix/store.scm
index 49549d0771..7152a5556a 100644
--- a/guix/store.scm
+++ b/guix/store.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -138,7 +138,7 @@
             direct-store-path
             log-file))
 
-(define %protocol-version #x10f)
+(define %protocol-version #x161)
 
 (define %worker-magic-1 #x6e697863)               ; "nixc"
 (define %worker-magic-2 #x6478696f)               ; "dxio"
@@ -537,14 +537,14 @@ encoding conversion errors."
                             #:key keep-failed? keep-going? fallback?
                             (verbosity 0)
                             rounds                ;number of build rounds
-                            (max-build-jobs 1)
+                            max-build-jobs
                             timeout
-                            (max-silent-time 3600)
+                            max-silent-time
                             (use-build-hook? #t)
                             (build-verbosity 0)
                             (log-type 0)
                             (print-build-trace #t)
-                            (build-cores (current-processor-count))
+                            build-cores
                             (use-substitutes? #t)
 
                             ;; Client-provided substitute URLs.  If it is #f,
@@ -570,21 +570,37 @@ encoding conversion errors."
                           ...)))))
     (write-int (operation-id set-options) socket)
     (send (boolean keep-failed?) (boolean keep-going?)
-          (boolean fallback?) (integer verbosity)
-          (integer max-build-jobs) (integer max-silent-time))
+          (boolean fallback?) (integer verbosity))
+    (when (< (nix-server-minor-version server) #x61)
+      (let ((max-build-jobs (or max-build-jobs 1))
+            (max-silent-time (or max-silent-time 3600)))
+        (send (integer max-build-jobs) (integer max-silent-time))))
     (when (>= (nix-server-minor-version server) 2)
       (send (boolean use-build-hook?)))
     (when (>= (nix-server-minor-version server) 4)
       (send (integer build-verbosity) (integer log-type)
             (boolean print-build-trace)))
-    (when (>= (nix-server-minor-version server) 6)
-      (send (integer build-cores)))
+    (when (and (>= (nix-server-minor-version server) 6)
+               (< (nix-server-minor-version server) #x61))
+      (let ((build-cores (or build-cores (current-processor-count))))
+        (send (integer build-cores))))
     (when (>= (nix-server-minor-version server) 10)
       (send (boolean use-substitutes?)))
     (when (>= (nix-server-minor-version server) 12)
       (let ((pairs `(,@(if timeout
                            `(("build-timeout" . ,(number->string timeout)))
                            '())
+                     ,@(if max-silent-time
+                           `(("build-max-silent-time"
+                              . ,(number->string max-silent-time)))
+                           '())
+                     ,@(if max-build-jobs
+                           `(("build-max-jobs"
+                              . ,(number->string max-build-jobs)))
+                           '())
+                     ,@(if build-cores
+                           `(("build-cores" . ,(number->string build-cores)))
+                           '())
                      ,@(if substitute-urls
                            `(("substitute-urls"
                               . ,(string-join substitute-urls)))
diff --git a/nix/libstore/worker-protocol.hh b/nix/libstore/worker-protocol.hh
index bdeaca2e3a..efe9eadf23 100644
--- a/nix/libstore/worker-protocol.hh
+++ b/nix/libstore/worker-protocol.hh
@@ -6,7 +6,7 @@ namespace nix {
 #define WORKER_MAGIC_1 0x6e697863
 #define WORKER_MAGIC_2 0x6478696f
 
-#define PROTOCOL_VERSION 0x160
+#define PROTOCOL_VERSION 0x161
 #define GET_PROTOCOL_MAJOR(x) ((x) & 0xff00)
 #define GET_PROTOCOL_MINOR(x) ((x) & 0x00ff)
 
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;
 
diff --git a/nix/nix-daemon/nix-daemon.cc b/nix/nix-daemon/nix-daemon.cc
index 47b67d5863..79580ffb48 100644
--- a/nix/nix-daemon/nix-daemon.cc
+++ b/nix/nix-daemon/nix-daemon.cc
@@ -549,8 +549,12 @@ static void performOp(bool trusted, unsigned int clientVersion,
         settings.keepGoing = readInt(from) != 0;
         settings.set("build-fallback", readInt(from) ? "true" : "false");
         verbosity = (Verbosity) readInt(from);
-        settings.set("build-max-jobs", std::to_string(readInt(from)));
-        settings.set("build-max-silent-time", std::to_string(readInt(from)));
+
+        if (GET_PROTOCOL_MINOR(clientVersion) < 0x61) {
+            settings.set("build-max-jobs", std::to_string(readInt(from)));
+            settings.set("build-max-silent-time", std::to_string(readInt(from)));
+        }
+
         if (GET_PROTOCOL_MINOR(clientVersion) >= 2)
             settings.useBuildHook = readInt(from) != 0;
         if (GET_PROTOCOL_MINOR(clientVersion) >= 4) {
@@ -558,7 +562,8 @@ static void performOp(bool trusted, unsigned int clientVersion,
             logType = (LogType) readInt(from);
             settings.printBuildTrace = readInt(from) != 0;
         }
-        if (GET_PROTOCOL_MINOR(clientVersion) >= 6)
+        if (GET_PROTOCOL_MINOR(clientVersion) >= 6
+            && GET_PROTOCOL_MINOR(clientVersion) < 0x61)
             settings.set("build-cores", std::to_string(readInt(from)));
         if (GET_PROTOCOL_MINOR(clientVersion) >= 10)
             settings.set("build-use-substitutes", readInt(from) ? "true" : "false");
@@ -567,7 +572,10 @@ static void performOp(bool trusted, unsigned int clientVersion,
             for (unsigned int i = 0; i < n; i++) {
                 string name = readString(from);
                 string value = readString(from);
-                if (name == "build-timeout" || name == "build-repeat" || name == "use-ssh-substituter")
+                if (name == "build-timeout" || name == "build-max-silent-time"
+                    || name == "build-max-jobs" || name == "build-cores"
+                    || name == "build-repeat"
+                    || name == "use-ssh-substituter")
                     settings.set(name, value);
                 else
                     settings.set(trusted ? name : "untrusted-" + name, value);
diff --git a/tests/guix-daemon.sh b/tests/guix-daemon.sh
index 7122eed0e6..fde49e25a2 100644
--- a/tests/guix-daemon.sh
+++ b/tests/guix-daemon.sh
@@ -1,5 +1,5 @@
 # GNU Guix --- Functional package management for GNU
-# Copyright © 2012, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+# Copyright © 2012, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
 #
 # This file is part of GNU Guix.
 #
@@ -118,3 +118,30 @@ guile -c "
                            (clear-failed-paths store (list out))
                            (null? (query-failed-paths store)))))))
     #:guile-for-build (%guile-for-build)) "
+
+kill "$daemon_pid"
+
+
+# Make sure the daemon's default 'build-cores' setting is honored.
+
+guix-daemon --listen="$socket" --disable-chroot --cores=42 &
+daemon_pid=$!
+
+GUIX_DAEMON_SOCKET="$socket" \
+guile -c '
+  (use-modules (guix) (gnu packages) (guix tests))
+
+  (with-store store
+    (let* ((build  (add-text-to-store store "build.sh"
+                                      "echo $NIX_BUILD_CORES > $out"))
+           (bash   (add-to-store store "bash" #t "sha256"
+                                 (search-bootstrap-binary "bash"
+                                                          (%current-system))))
+           (drv    (derivation store "the-thing" bash
+                               `("-e" ,build)
+                               #:inputs `((,bash) (,build))
+                               #:env-vars `(("x" . ,(random-text))))))
+      (and (build-derivations store (list drv))
+           (exit
+            (= 42 (pk (call-with-input-file (derivation->output-path drv)
+                        read)))))))'
diff --git a/tests/store.scm b/tests/store.scm
index 123ea8a787..983766d862 100644
--- a/tests/store.scm
+++ b/tests/store.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -948,4 +948,29 @@
          (string=? (derivation-file-name d)
                    (path-info-deriver (query-path-info %store o))))))
 
+(test-equal "build-cores"
+  (list 0 42)
+  (with-store store
+    (let* ((build  (add-text-to-store store "build.sh"
+                                      "echo $NIX_BUILD_CORES > $out"))
+           (bash   (add-to-store store "bash" #t "sha256"
+                                 (search-bootstrap-binary "bash"
+                                                          (%current-system))))
+           (drv1   (derivation store "the-thing" bash
+                               `("-e" ,build)
+                               #:inputs `((,bash) (,build))
+                               #:env-vars `(("x" . ,(random-text)))))
+           (drv2   (derivation store "the-thing" bash
+                               `("-e" ,build)
+                               #:inputs `((,bash) (,build))
+                               #:env-vars `(("x" . ,(random-text))))))
+      (and (build-derivations store (list drv1))
+           (begin
+             (set-build-options store #:build-cores 42)
+             (build-derivations store (list drv2)))
+           (list (call-with-input-file (derivation->output-path drv1)
+                   read)
+                 (call-with-input-file (derivation->output-path drv2)
+                   read))))))
+
 (test-end "store")