Add shutil lib for rmtree

modules/lib/shutil.py

@@ -0,0 +1,48 @@
+# Reimplement, because CPython3.3 impl is rather bloated
+import os
+from collections import namedtuple
+
+_ntuple_diskusage = namedtuple("usage", ("total", "used", "free"))
+
+
+def rmtree(d):
+    if not d:
+        raise ValueError
+
+    for name, type, *_ in os.ilistdir(d):
+        path = d + "/" + name
+        if type & 0x4000:  # dir
+            rmtree(path)
+        else:  # file
+            os.unlink(path)
+    os.rmdir(d)
+
+
+def copyfileobj(src, dest, length=512):
+    if hasattr(src, "readinto"):
+        buf = bytearray(length)
+        while True:
+            sz = src.readinto(buf)
+            if not sz:
+                break
+            if sz == length:
+                dest.write(buf)
+            else:
+                b = memoryview(buf)[:sz]
+                dest.write(b)
+    else:
+        while True:
+            buf = src.read(length)
+            if not buf:
+                break
+            dest.write(buf)
+
+
+def disk_usage(path):
+    bit_tuple = os.statvfs(path)
+    blksize = bit_tuple[0]  # system block size
+    total = bit_tuple[2] * blksize
+    free = bit_tuple[3] * blksize
+    used = total - free
+
+    return _ntuple_diskusage(total, used, free)