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-rw-r--r--nix/libstore/build.cc25
1 files changed, 19 insertions, 6 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);
}