remove exp_backoff_fn

conda/install.py

@@ -41,7 +41,6 @@
 import tarfile
 import time
 import traceback
-import random
 from os.path import (abspath, basename, dirname, isdir, isfile, islink,
                      join, relpath, normpath)
 
@@ -225,21 +224,6 @@ def warn_failed_remove(function, path, exc_info):
         log.warn("Cannot remove, unknown reason: {0}".format(path))
 
 
-def exp_backoff_fn(fn, *args):
-    """Mostly for retrying file operations that fail on Windows due to virus scanners"""
-    max_retries = 5
-    for n in range(max_retries):
-        try:
-            result = fn(*args)
-        except Exception as e:
-            log.debug(repr(e))
-            if n == max_retries-1:
-                raise
-            time.sleep((2 ** n) + (random.randint(0, 1000) / 1000))
-        else:
-            return result
-
-
 def rm_rf(path, max_retries=5, trash=True):
     """
     Completely delete path
@@ -418,7 +402,7 @@ def update_prefix(path, new_prefix, placeholder=prefix_placeholder, mode='text')
     st = os.lstat(path)
     # Remove file before rewriting to avoid destroying hard-linked cache
     os.remove(path)
-    with exp_backoff_fn(open, path, 'wb') as fo:
+    with open(path, 'wb') as fo:
         fo.write(data)
     os.chmod(path, stat.S_IMODE(st.st_mode))
 
@@ -842,7 +826,7 @@ def extract(dist):
         with tarfile.open(fname) as t:
             t.extractall(path=temp_path)
         rm_rf(path)
-        exp_backoff_fn(os.rename, temp_path, path)
+        os.rename(temp_path, path)
         if sys.platform.startswith('linux') and os.getuid() == 0:
             # When extracting as root, tarfile will by restore ownership
             # of extracted files.  However, we want root to be the owner