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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/libstore/globals.hh
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/libstore/globals.hh')
-rw-r--r--nix/libstore/globals.hh9
1 files changed, 8 insertions, 1 deletions
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;