aquarium: Preliminary check for if executable exists

Author: obiwac

src/class/aquarium.c

@@ -219,6 +219,10 @@ static int instantiate(flamingo_val_t* inst, flamingo_arg_list_t* args) {
 		return -1;
 	}
 
+	if (!has_aquarium_cli()) {
+		return -1;
+	}
+
 	// Create state object.
 
 	aquarium_state_t* const state = malloc(sizeof *state);

src/class/aquarium_builder.c

@@ -301,6 +301,10 @@ static int instantiate(flamingo_val_t* inst, flamingo_arg_list_t* args) {
 		return -1;
 	}
 
+	if (!has_aquarium_cli()) {
+		return -1;
+	}
+
 	// Create state object.
 
 	state_t* const state = malloc(sizeof *state);

src/class/aquarium_common.h

@@ -3,6 +3,9 @@
 
 #pragma once
 
+#include <cmd.h>
+#include <logging.h>
+
 typedef struct {
 	char* template;
 	char* kernel;
@@ -12,4 +15,11 @@ typedef struct {
 	char* cookie;
 } aquarium_state_t;
 
-// TODO Put the preliminary aquarium check in here as a simple inline function.
+static bool has_aquarium_cli(void) {
+	if (!cmd_exists("aquarium")) {
+		LOG_FATAL("Couldn't find 'aquarium' executable in PATH. The aquarium tool is something you must install separately.");
+		return false;
+	}
+
+	return true;
+}