Add "warning" verbosity level

This ensures that "nix" shows warnings. Previously these were hidden
because they were at "info" level.

(cherry picked from commit 615a9d031d22a6aee64f8511e15685e47b6f8796)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/nix/main.cc b/src/nix/main.cc
index 25e321b86b..19bb7a5431 100644
--- a/src/nix/main.cc
+++ b/src/nix/main.cc
@@ -93,7 +93,7 @@ void mainWrapped(int argc, char * * argv)
         if (legacy) return legacy(argc, argv);
     }
 
-    verbosity = lvlError;
+    verbosity = lvlWarn;
     settings.verboseBuild = false;
 
     NixArgs args;