daemon: Add "/guix" to default 'nixLibexecDir'.

This makes it easier to run the uninstalled daemon.

* nix/local.mk (libstore_a_CPPFLAGS): Append "/guix" to
NIX_LIBEXEC_DIR.
* build-aux/pre-inst-env.in (NIX_LIBEXEC_DIR): Adjust comment.
* nix/libstore/builtins.cc (builtinDownload): Remove SUBDIR and its
use.
* nix/libstore/local-store.cc (runAuthenticationProgram): Ditto.
* nix/libstore/gc.cc (addAdditionalRoots): Remove "/guix" prefix.
* nix/nix-daemon/guix-daemon.cc (main): Ditto.

1 files changed, 2 insertions, 8 deletions

diff --git a/nix/libstore/builtins.cc b/nix/libstore/builtins.cc
index 1f52511c80..f7c7d42484 100644
--- a/nix/libstore/builtins.cc
+++ b/nix/libstore/builtins.cc
@@ -1,5 +1,5 @@
 /* GNU Guix --- Functional package management for GNU
-   Copyright (C) 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
+   Copyright (C) 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
 
    This file is part of GNU Guix.
 
@@ -50,13 +50,7 @@ static void builtinDownload(const Derivation &drv,
     /* Tell it about options such as "print-extended-build-trace".  */
     setenv("_NIX_OPTIONS", settings.pack().c_str(), 1);
 
-    /* XXX: Hack our way to use the 'download' script from 'LIBEXECDIR/guix'
-       or just 'LIBEXECDIR', depending on whether we're running uninstalled or
-       not.  */
-    const string subdir = getenv("GUIX_UNINSTALLED") != NULL
-	? "" : "/guix";
-
-    const string program = settings.nixLibexecDir + subdir + "/download";
+    const string program = settings.nixLibexecDir + "/download";
     execv(program.c_str(), (char *const *) argv);
 
     throw SysError(format("failed to run download program '%1%'") % program);