daemon: Remove 'NIX_LIBEXEC_DIR'.

* nix/libstore/globals.hh (Settings)[nixLibexecDir]: Remove.
* nix/libstore/globals.cc (Settings::processEnvironment): Remove
reference to 'nixLibexecDir'.
* nix/local.mk (libstore_a_CPPFLAGS): Remove -DNIX_LIBEXEC_DIR flag.
* build-aux/pre-inst-env.in: Remove references to 'NIX_LIBEXEC_DIR'.

build-aux/pre-inst-env.in

@@ -42,12 +42,6 @@ export GUILE_LOAD_COMPILED_PATH GUILE_LOAD_PATH
 PATH="$abs_top_builddir/scripts:$abs_top_builddir:$PATH"
 export PATH
 
-# Daemon helpers.
-
-NIX_LIBEXEC_DIR="@abs_top_builddir@/nix/scripts" # for 'authenticate', etc.
-
-export NIX_LIBEXEC_DIR
-
 # The daemon invokes 'guix'; tell it which one to use.
 GUIX="$abs_top_builddir/scripts/guix"
 export GUIX

nix/libstore/globals.cc

@@ -70,7 +70,6 @@ void Settings::processEnvironment()
     nixStateDir = canonPath(getEnv("GUIX_STATE_DIRECTORY", NIX_STATE_DIR));
     nixDBPath = getEnv("GUIX_DATABASE_DIRECTORY", nixStateDir + "/db");
     nixConfDir = canonPath(getEnv("GUIX_CONFIGURATION_DIRECTORY", GUIX_CONFIGURATION_DIRECTORY));
-    nixLibexecDir = canonPath(getEnv("NIX_LIBEXEC_DIR", NIX_LIBEXEC_DIR));
     nixBinDir = canonPath(getEnv("NIX_BIN_DIR", NIX_BIN_DIR));
     nixDaemonSocketFile = canonPath(nixStateDir + DEFAULT_SOCKET_PATH);
     guixProgram = canonPath(getEnv("GUIX", nixBinDir + "/guix"));

nix/libstore/globals.hh

@@ -57,9 +57,6 @@ struct Settings {
     /* The directory where configuration files are stored. */
     Path nixConfDir;
 
-    /* The directory where internal helper programs are stored. */
-    Path nixLibexecDir;
-
     /* The directory where the main programs are stored. */
     Path nixBinDir;
 

nix/local.mk

@@ -110,7 +110,6 @@ libstore_a_CPPFLAGS =				\
   -DNIX_STATE_DIR=\"$(localstatedir)/guix\"	\
   -DNIX_LOG_DIR=\"$(localstatedir)/log/guix\"	\
   -DGUIX_CONFIGURATION_DIRECTORY=\"$(sysconfdir)/guix\"		\
-  -DNIX_LIBEXEC_DIR=\"$(libexecdir)/guix\"	\
   -DNIX_BIN_DIR=\"$(bindir)\"			\
   -DDEFAULT_CHROOT_DIRS="\"\""