tools/mpremote: Add mkdir and rmdir to RemoteFS.

This allows the remote MicroPython instance to create and delete
directories from the mounted host filesystem in addition to the already
existing functionality of reading, creating, and modifying files.

Signed-off-by: Michael Bentley <mikebentley15@gmail.com>

tools/mpremote/mpremote/pyboardextended.py

@@ -21,6 +21,8 @@ fs_hook_cmds = {
     "CMD_SEEK": 8,
     "CMD_REMOVE": 9,
     "CMD_RENAME": 10,
+    "CMD_MKDIR": 11,
+    "CMD_RMDIR": 12,
 }
 
 fs_hook_code = """\
@@ -265,6 +267,24 @@ class RemoteFS:
         if res < 0:
             raise OSError(-res)
 
+    def mkdir(self, path):
+        c = self.cmd
+        c.begin(CMD_MKDIR)
+        c.wr_str(self.path + path)
+        res = c.rd_s32()
+        c.end()
+        if res < 0:
+            raise OSError(-res)
+
+    def rmdir(self, path):
+        c = self.cmd
+        c.begin(CMD_RMDIR)
+        c.wr_str(self.path + path)
+        res = c.rd_s32()
+        c.end()
+        if res < 0:
+            raise OSError(-res)
+
     def stat(self, path):
         c = self.cmd
         c.begin(CMD_STAT)
@@ -501,6 +521,28 @@ class PyboardCommand:
             ret = -abs(er.errno)
         self.wr_s32(ret)
 
+    def do_mkdir(self):
+        path = self.root + self.rd_str()
+        # self.log_cmd(f"mkdir {path}")
+        try:
+            self.path_check(path)
+            os.mkdir(path)
+            ret = 0
+        except OSError as er:
+            ret = -abs(er.errno)
+        self.wr_s32(ret)
+
+    def do_rmdir(self):
+        path = self.root + self.rd_str()
+        # self.log_cmd(f"rmdir {path}")
+        try:
+            self.path_check(path)
+            os.rmdir(path)
+            ret = 0
+        except OSError as er:
+            ret = -abs(er.errno)
+        self.wr_s32(ret)
+
     cmd_table = {
         fs_hook_cmds["CMD_STAT"]: do_stat,
         fs_hook_cmds["CMD_ILISTDIR_START"]: do_ilistdir_start,
@@ -512,6 +554,8 @@ class PyboardCommand:
         fs_hook_cmds["CMD_SEEK"]: do_seek,
         fs_hook_cmds["CMD_REMOVE"]: do_remove,
         fs_hook_cmds["CMD_RENAME"]: do_rename,
+        fs_hook_cmds["CMD_MKDIR"]: do_mkdir,
+        fs_hook_cmds["CMD_RMDIR"]: do_rmdir,
     }