otg msd: notify about free space while uploading

kvmd/plugins/msd/otg/fs.py

@@ -0,0 +1,58 @@
+# ========================================================================== #
+#                                                                            #
+#    KVMD - The main Pi-KVM daemon.                                          #
+#                                                                            #
+#    Copyright (C) 2018  Maxim Devaev <mdevaev@gmail.com>                    #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+# ========================================================================== #
+
+
+import os
+import dataclasses
+
+from typing import Optional
+
+from ....logging import get_logger
+
+
+# =====
+@dataclasses.dataclass(frozen=True)
+class FsSpace:
+    size: int
+    free: int
+
+
+# =====
+def get_file_size(path: str) -> int:
+    try:
+        return os.path.getsize(path)
+    except Exception as err:
+        get_logger().warning("Can't get size of file %s: %s", path, err)
+        return -1
+
+
+def get_fs_space(path: str, fatal: bool) -> Optional[FsSpace]:
+    try:
+        st = os.statvfs(path)
+    except Exception as err:
+        if fatal:
+            raise
+        get_logger().warning("Can't get free space of filesystem %s: %s", path, err)
+        return None
+    return FsSpace(
+        size=(st.f_blocks * st.f_frsize),
+        free=(st.f_bavail * st.f_frsize),
+    )