fix: security hardening (#112-#118)

src/shared/file.h

@@ -18,6 +18,7 @@ typedef struct {
   char* path;
   Data* data;
   FileMetadata* metadata;
+  bool skip;
 } File;
 
 File* file_create(const char* path);
@@ -32,7 +33,7 @@ size_t file_content_to_buffer(File* file);
 FileMetadata* file_metadata_create(const struct stat* stats);
 void file_metadata_destroy(void* metadata);
 bool to_disk(const char* path, const void* data, unsigned long long data_size);
-bool file_save_to_disk(const char* root_directory, File* file);
+bool file_save_to_disk(const char* root_directory, File* file, const Config* config);
 File* receive_incremental_check(int fd, const Config* config, bool* skipped);
 int receive_manifest(int fd, const Config* config, int* next_status);