i3: Check whether configuration file is valid.

Finally, after going through quite some journey, we can now check the
config file without needing an X connection. The journey took a bit
longer, because I was stubborn enough to get the test suite running on
Nix (because I wanted to have an upstream test case for this). All that
to create a small patch which just checks that damn config file and
emits an exit code that actually reflects the output :-)

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/modules/i3/default.nix b/modules/i3/default.nix
index a10c9e69..417e987a 100644
--- a/modules/i3/default.nix
+++ b/modules/i3/default.nix
@@ -102,6 +102,10 @@ in
       inherit (pkgs) dmenu xterm pvolctrl;
       inherit (pkgs.xorg) xsetroot;
       inherit wsConfig barConfig;
+
+      postInstall = ''
+        ${pkgs.i3}/bin/i3 -c "$target" -C
+      '';
     };
   };
 }