Remove $NIX_BUILD_HOOK and $NIX_CURRENT_LOAD

This is to simplify remote build configuration. These environment
variables predate nix.conf.

The build hook now has a sensible default (namely build-remote).

The current load is kept in the Nix state directory now.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/build-remote/build-remote.cc b/src/build-remote/build-remote.cc
index 1ee8a625b6bc..c41383bcf27d 100644
--- a/src/build-remote/build-remote.cc
+++ b/src/build-remote/build-remote.cc
@@ -140,7 +140,9 @@ int main (int argc, char * * argv)
         settings.buildTimeout = std::stoll(argv[3]);
         verbosity = (Verbosity) std::stoll(argv[4]);
 
-        currentLoad = getEnv("NIX_CURRENT_LOAD", "/run/nix/current-load");
+        /* It would be more appropriate to use $XDG_RUNTIME_DIR, since
+           that gets cleared on reboot, but it wouldn't work on OS X. */
+        currentLoad = settings.nixStateDir + "/current-load";
 
         std::shared_ptr<Store> sshStore;
         AutoCloseFD bestSlotLock;