Implemented the creation of backing disks

src/utils.c

@@ -359,3 +359,49 @@ bool delete_directory(const char* directory, int level) {
 
 	return true;
 }
+
+bool copy_file(const char* source, const char* destination, mode_t mode, uid_t uid, gid_t gid) {
+	// Open the source file
+	FILE* source_file = fopen(source, "r");
+	if (source_file == NULL) {
+		log_msg(LOG_ERROR, "Failed to open file '%s' for reading (%s).", source, strerror(errno));
+		return false;
+	}
+
+	// Open the destination file
+	FILE* destination_file = fopen(destination, "w");
+	if (destination_file == NULL) {
+		log_msg(LOG_ERROR, "Failed to open file '%s' for writing (%s).", destination, strerror(errno));
+		fclose(source_file);
+		return false;
+	}
+
+	// Copy the file
+	char buffer[4096];
+	size_t bytes_read;
+	while ((bytes_read = fread(buffer, 1, sizeof(buffer), source_file)) > 0)
+		if (fwrite(buffer, 1, bytes_read, destination_file) != bytes_read) {
+			log_msg(LOG_ERROR, "Failed to write to file '%s' (%s).", destination, strerror(errno));
+			fclose(source_file);
+			fclose(destination_file);
+			return false;
+		}
+
+	// Close the files
+	fclose(source_file);
+	fclose(destination_file);
+
+	// Change the mode of the destination file
+	if (chmod(destination, mode) != 0) {
+		log_msg(LOG_ERROR, "Failed to change the mode of file '%s' (%s).", destination, strerror(errno));
+		return false;
+	}
+
+	// Change the owner of the destination file
+	if (chown(destination, uid, gid) != 0) {
+		log_msg(LOG_ERROR, "Failed to change the owner of file '%s' (%s).", destination, strerror(errno));
+		return false;
+	}
+
+	return true;
+}