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authorLudovic Courtès <ludo@gnu.org>2018-10-15 22:40:35 +0200
committerLudovic Courtès <ludo@gnu.org>2018-10-15 22:40:35 +0200
commit6ef61cc4c30e94acbd7437f19c893f63a7112267 (patch)
tree84438580eccfeb44780d0434293e7fd84bb7be53 /nix
parent2ab321ca37d1c00c1540d78d587226d3d487b2d4 (diff)
daemon: Support multiplexed build output.
This allows clients to tell whether output comes from the daemon or, if it comes from a builder, from which builder it comes. The latter is particularly useful when MAX-BUILD-JOBS > 1. * nix/libstore/build.cc (DerivationGoal::tryBuildHook) (DerivationGoal::startBuilder): Print the child's PID in "@ build-started" traces. (DerivationGoal::handleChildOutput): Define 'prefix', pass it to 'writeToStderr'. * nix/libstore/globals.cc (Settings:Settings): Initialize 'multiplexedBuildOutput'. (Settings::update): Likewise. * nix/libstore/globals.hh (Settings)[multiplexedBuildOutput]: New field. Update 'printBuildTrace' documentation. * nix/libstore/worker-protocol.hh (PROTOCOL_VERSION): Bump to 0.163. * nix/nix-daemon/nix-daemon.cc (performOp) <wopSetOptions>: Special-case "multiplexed-build-output" and remove "use-ssh-substituter". * guix/store.scm (set-build-options): Add #:multiplexed-build-output? and honor it. (%protocol-version): Bump to #x163. * tests/store.scm ("multiplexed-build-output"): New test. fixlet
Diffstat (limited to 'nix')
-rw-r--r--nix/libstore/build.cc25
-rw-r--r--nix/libstore/globals.cc2
-rw-r--r--nix/libstore/globals.hh9
-rw-r--r--nix/libstore/worker-protocol.hh2
-rw-r--r--nix/nix-daemon/nix-daemon.cc2
5 files changed, 31 insertions, 9 deletions
diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index b2c319f00b..d7b8b0f0ca 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -1652,8 +1652,8 @@ HookReply DerivationGoal::tryBuildHook()
worker.childStarted(shared_from_this(), hook->pid, fds, false, false);
if (settings.printBuildTrace)
- printMsg(lvlError, format("@ build-started %1% - %2% %3%")
- % drvPath % drv.platform % logFile);
+ printMsg(lvlError, format("@ build-started %1% - %2% %3% %4%")
+ % drvPath % drv.platform % logFile % hook->pid);
return rpAccept;
}
@@ -2038,8 +2038,8 @@ void DerivationGoal::startBuilder()
if (!msg.empty()) throw Error(msg);
if (settings.printBuildTrace) {
- printMsg(lvlError, format("@ build-started %1% - %2% %3%")
- % drvPath % drv.platform % logFile);
+ printMsg(lvlError, format("@ build-started %1% - %2% %3% %4%")
+ % drvPath % drv.platform % logFile % pid);
}
}
@@ -2736,6 +2736,19 @@ void DerivationGoal::deleteTmpDir(bool force)
void DerivationGoal::handleChildOutput(int fd, const string & data)
{
+ string prefix;
+
+ if (settings.multiplexedBuildOutput) {
+ /* Print a prefix that allows clients to determine whether a message
+ comes from the daemon or from a build process, and in the latter
+ case, which build process it comes from. The PID here matches the
+ one given in "@ build-started" traces; it's shorter that the
+ derivation file name, hence this choice. */
+ prefix = "@ build-log "
+ + std::to_string(pid < 0 ? hook->pid : pid)
+ + " " + std::to_string(data.size()) + "\n";
+ }
+
if ((hook && fd == hook->builderOut.readSide) ||
(!hook && fd == builderOut.readSide))
{
@@ -2748,7 +2761,7 @@ void DerivationGoal::handleChildOutput(int fd, const string & data)
return;
}
if (verbosity >= settings.buildVerbosity)
- writeToStderr(data);
+ writeToStderr(prefix + data);
if (gzLogFile) {
if (data.size() > 0) {
@@ -2767,7 +2780,7 @@ void DerivationGoal::handleChildOutput(int fd, const string & data)
}
if (hook && fd == hook->fromHook.readSide)
- writeToStderr(data);
+ writeToStderr(prefix + data);
}
diff --git a/nix/libstore/globals.cc b/nix/libstore/globals.cc
index 94c2e516f8..4b5b485e65 100644
--- a/nix/libstore/globals.cc
+++ b/nix/libstore/globals.cc
@@ -36,6 +36,7 @@ Settings::Settings()
buildTimeout = 0;
useBuildHook = true;
printBuildTrace = false;
+ multiplexedBuildOutput = false;
reservedSize = 8 * 1024 * 1024;
fsyncMetadata = true;
useSQLiteWAL = true;
@@ -120,6 +121,7 @@ void Settings::update()
_get(maxBuildJobs, "build-max-jobs");
_get(buildCores, "build-cores");
_get(thisSystem, "system");
+ _get(multiplexedBuildOutput, "multiplexed-build-output");
_get(maxSilentTime, "build-max-silent-time");
_get(buildTimeout, "build-timeout");
_get(reservedSize, "gc-reserved-space");
diff --git a/nix/libstore/globals.hh b/nix/libstore/globals.hh
index 4c142e6933..a6935c3337 100644
--- a/nix/libstore/globals.hh
+++ b/nix/libstore/globals.hh
@@ -127,7 +127,7 @@ struct Settings {
a fixed format to allow its progress to be monitored. Each
line starts with a "@". The following are defined:
- @ build-started <drvpath> <outpath> <system> <logfile>
+ @ build-started <drvpath> <outpath> <system> <logfile> <pid>
@ build-failed <drvpath> <outpath> <exitcode> <error text>
@ build-succeeded <drvpath> <outpath>
@ substituter-started <outpath> <substituter>
@@ -139,6 +139,13 @@ struct Settings {
builders. */
bool printBuildTrace;
+ /* When true, 'buildDerivations' prefixes lines coming from builders so
+ that clients know exactly which line comes from which builder, and
+ which line comes from the daemon itself. The prefix for data coming
+ from builders is "log:PID:LEN:DATA" where PID uniquely identifies the
+ builder (PID is given in "build-started" traces.) */
+ bool multiplexedBuildOutput;
+
/* Amount of reserved space for the garbage collector
(/nix/var/nix/db/reserved). */
off_t reservedSize;
diff --git a/nix/libstore/worker-protocol.hh b/nix/libstore/worker-protocol.hh
index 103d60a8c2..ea67b10a5b 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 0x162
+#define PROTOCOL_VERSION 0x163
#define GET_PROTOCOL_MAJOR(x) ((x) & 0xff00)
#define GET_PROTOCOL_MINOR(x) ((x) & 0x00ff)
diff --git a/nix/nix-daemon/nix-daemon.cc b/nix/nix-daemon/nix-daemon.cc
index 782e4acfc5..2939422172 100644
--- a/nix/nix-daemon/nix-daemon.cc
+++ b/nix/nix-daemon/nix-daemon.cc
@@ -594,7 +594,7 @@ static void performOp(bool trusted, unsigned int clientVersion,
if (name == "build-timeout" || name == "build-max-silent-time"
|| name == "build-max-jobs" || name == "build-cores"
|| name == "build-repeat"
- || name == "use-ssh-substituter")
+ || name == "multiplexed-build-output")
settings.set(name, value);
else
settings.set(trusted ? name : "untrusted-" + name, value);