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, 12 insertions, 4 deletions

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);