Added syncing and working directory param to execute

src/backing.c

@@ -1,5 +1,6 @@
 #include "backing.h"
 
+#include "sandbox.h"
 #include "container.h"
 #include "disk.h"
 
@@ -444,3 +445,42 @@ result_t get_backing_info(disk_info_t* _info, const char* backing) {
 
 	return result;
 }
+
+result_t sync_backing_pool(void) {
+	// Execute /etc/sandbox.d/sync with the backing pool as the working directory
+	int exit_code;
+	// char* stdoutbuf;
+	char* stderrbuf;
+
+	// Get the path of the backing pool
+	char* pool_path;
+	result_t result = get_backing_pool_path(&pool_path);
+	if (result != success())
+		return result;
+
+	// Execute the sync script
+	result = execute(&exit_code, NULL, &stderrbuf, pool_path, "/etc/sandbox.d/sync", NULL);
+
+	free(pool_path);
+
+	// Check for errors during the execution
+	if (result != success())
+		return result;
+
+	// Check the exit code
+	if (exit_code != 0) {
+		// Remove all newlines from the stderr buffer
+		for (char* c = stderrbuf; *c != '\0'; c++)
+			if (*c == '\n')
+				*c = ' ';
+
+		result = failure("Failed to synchronize the backing pool (%s).", stderrbuf);
+		free(stderrbuf);
+		return result;
+	}
+
+	// Free the stderr buffer as it is not needed anymore
+	free(stderrbuf);
+
+	return success();
+}