commands/input: perform basic keymap validation

Before the delta input config is stored, this attempts to compile a
keymap with it. If the keymap fails to compile, then the first line of
the xkbcommon log entry will be included with a `CMD_FAILURE`, the
entire xkbcommon log entry will be included in the sway error log, and
the delta will not be stored.

This only handles basic issues such as a layouts not existing. This
will NOT catch more complex issues such as when a variant does
exist, but not for the given layout (ex: `azerty` is a valid variant,
but the `us` layout does not have a `azerty` variant).

1 files changed, 15 insertions, 0 deletions

diff --git a/sway/commands/input.c b/sway/commands/input.c
index 0195082c..23a6644f 100644
--- a/sway/commands/input.c
+++ b/sway/commands/input.c
@@ -2,6 +2,7 @@
 #include <strings.h>
 #include "sway/commands.h"
 #include "sway/input/input-manager.h"
+#include "sway/input/keyboard.h"
 #include "log.h"
 #include "stringop.h"
 
@@ -86,6 +87,20 @@ struct cmd_results *cmd_input(int argc, char **argv) {
 	}
 
 	if (!res || res->status == CMD_SUCCESS) {
+		char *error = NULL;
+		struct xkb_keymap *keymap = sway_keyboard_compile_keymap(
+				config->handler_context.input_config, &error);
+		if (!keymap) {
+			if (res) {
+				free_cmd_results(res);
+			}
+			res = cmd_results_new(CMD_FAILURE, "Failed to compile keymap: %s",
+					error ? error : "(details unavailable)");
+			free(error);
+			return res;
+		}
+		xkb_keymap_unref(keymap);
+
 		struct input_config *ic =
 			store_input_config(config->handler_context.input_config);