Fix savedata (un)mounting

_nx.py

@@ -1,3 +1,6 @@
+import nx
+
+
 def account_initialize():
     """Initializes the account service."""
     pass
@@ -17,7 +20,7 @@ def fs_mount_savedata(name: str, title_id: int, user_id: int):
     user_id: int
         The user ID of the user whose savedata filesystem to mount.
     """
-    pass
+    nx.filesystem.SAVEDATA_BASE_PATH = '../save/'
 
 
 def fsdev_unmount_device(mountpoint: str):

nx/filesystem.py

@@ -76,8 +76,9 @@ def unmount(self):
 
     def __enter__(self):
         self.mount()
+        return self
 
-    def __exit__(self):
+    def __exit__(self, exc_type, exc_val, exc_tb):
         self.commit()
         self.unmount()
 
@@ -111,7 +112,7 @@ def unmount(self):
         """Unmounts the mounted RomFS."""
         _nx.fsdev_unmount_device('romfs')
 
-    def __exit__(self):
+    def __exit__(self, exc_type, exc_val, exc_tb):
         self.unmount()
 
 
@@ -150,6 +151,7 @@ def mount(self):
 
     def commit(self):
         """Commits the savedata filesystem."""
+        print(_nx.__dict__)
         _nx.fsdev_commit_device('save')
 
     def unmount(self):

test.py

@@ -8,15 +8,12 @@
 
 
 def main():
-    nx.filesystem.SAVEDATA_BASE_PATH = '../save/'
-    nx.filesystem.ROMFS_BASE_PATH = '../romfs/'
-
     botw = nx.titles[BOTW_TITLE_ID]  # get botw Title object
 
     try:
         with botw.savedata as savedata:  # mount BotW savedata partition
-            with savedata.open(SAVEGAME_PATH) as savegame_file:  # open save game file
-                with open(OUTPUT_PATH, 'w') as destination_file:  # open destination file on SD card
+            with savedata.open(SAVEGAME_PATH, 'rb') as savegame_file:  # open save game file
+                with open(OUTPUT_PATH, 'wb') as destination_file:  # open destination file on SD card
                     shutil.copyfileobj(savegame_file, destination_file)  # copy file from savedata to SD card
     except FileNotFoundError:
         print("No such file:", SAVEGAME_PATH)