From e2332e8aa7240451fd596140d242dc062c93230b Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Sun, 16 Dec 2012 18:13:59 +0100
Subject: daemon: Warn against running as root without `--build-users-group'.

* nix/nix-daemon/guix-daemon.cc (main): Recommend using
  `--build-users-group' when running  as root without a build users
  group.
---
 nix/nix-daemon/guix-daemon.cc | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'nix')

diff --git a/nix/nix-daemon/guix-daemon.cc b/nix/nix-daemon/guix-daemon.cc
index 0e72b1d219..459c794f5d 100644
--- a/nix/nix-daemon/guix-daemon.cc
+++ b/nix/nix-daemon/guix-daemon.cc
@@ -25,6 +25,8 @@
 
 #include <stdlib.h>
 #include <argp.h>
+#include <unistd.h>
+#include <sys/types.h>
 
 /* Variables used by `nix-daemon.cc'.  */
 volatile ::sig_atomic_t blockInt;
@@ -176,6 +178,10 @@ main (int argc, char *argv[])
 
   argp_parse (&argp, argc, argv, 0, 0, 0);
 
+  if (geteuid () == 0 && settings.buildUsersGroup.empty ())
+    fprintf (stderr, "warning: running as root is highly recommended, "
+	     "unless `--build-users-group' is used\n");
+
   argvSaved = argv;
   run (nothing);
 }
-- 
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