Abort early when XDG_RUNTIME_DIR is not set

This aborts sway and displays an error message about XDG_RUNTIME_DIR
not being set without initializing the wl_display or logging any other
information.

1 files changed, 8 insertions, 0 deletions

diff --git a/sway/main.c b/sway/main.c
index 12f92bd8..b118a182 100644
--- a/sway/main.c
+++ b/sway/main.c
@@ -299,6 +299,14 @@ int main(int argc, char **argv) {
                 }
         }
 
+        // Since wayland requires XDG_RUNTIME_DIR to be set, abort with just the
+        // clear error message (when not running as an IPC client).
+        if (!getenv("XDG_RUNTIME_DIR") && optind == argc) {
+                fprintf(stderr,
+                                "XDG_RUNTIME_DIR is not set in the environment. Aborting.\n");
+                exit(EXIT_FAILURE);
+        }
+
         // As the 'callback' function for wlr_log is equivalent to that for
         // sway, we do not need to override it.
         if (debug) {