prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  pip6.0.4 can not work under python3.4, windows7 64bit.
  use" pip list" command,  met a error:
  
  ``` python
  Traceback (most recent call last):
    File "C:\Python34\Scripts\pip-script.py", line 9, in <module>
      load_entry_point('pip==6.0.4', 'console_scripts', 'pip')()
    File "C:\Python34\lib\site-packages\pip-6.0.4-py3.4.egg\pip\__init__.py", line
   217, in main
      return command.main(cmd_args)
    File "C:\Python34\lib\site-packages\pip-6.0.4-py3.4.egg\pip\basecommand.py", l
  ine 122, in main
      write_debug_log = check_path_owner(debug_log_path, os.geteuid())
  AttributeError: 'module' object has no attribute 'geteuid'
  ```
  
  other commands can not work also.
  
  
  </issue>
  <code>
  [start of pip/utils/filesystem.py]
  1 import os.path
  2 
  3 from pip.compat import get_path_uid
  4 
  5 
  6 def check_path_owner(path, uid):
  7     previous = None
  8     while path != previous:
  9         if os.path.lexists(path):
  10             # Actually do the ownership check
  11             try:
  12                 if get_path_uid(path) != os.geteuid():
  13                     return False
  14             except OSError:
  15                 return False
  16             return True
  17         else:
  18             previous, path = path, os.path.dirname(path)
  19
  [end of pip/utils/filesystem.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/pip/utils/filesystem.py b/pip/utils/filesystem.py
  --- a/pip/utils/filesystem.py
  +++ b/pip/utils/filesystem.py
  @@ -1,9 +1,15 @@
  +import os
   import os.path
   
   from pip.compat import get_path_uid
   
   
   def check_path_owner(path, uid):
  +    # If we don't have a way to check the effective uid of this process, then
  +    # we'll just assume that we own the directory.
  +    if not hasattr(os, "geteuid"):
  +        return True
  +
       previous = None
       while path != previous:
           if os.path.lexists(path):
  
verification_info: {"golden_diff": "diff --git a/pip/utils/filesystem.py b/pip/utils/filesystem.py\n--- a/pip/utils/filesystem.py\n+++ b/pip/utils/filesystem.py\n@@ -1,9 +1,15 @@\n+import os\n import os.path\n \n from pip.compat import get_path_uid\n \n \n def check_path_owner(path, uid):\n+    # If we don't have a way to check the effective uid of this process, then\n+    # we'll just assume that we own the directory.\n+    if not hasattr(os, \"geteuid\"):\n+        return True\n+\n     previous = None\n     while path != previous:\n         if os.path.lexists(path):\n", "issue": "pip6.0.4 can not work under python3.4, windows7 64bit.\nuse\" pip list\" command,  met a error:\n\n``` python\nTraceback (most recent call last):\n  File \"C:\\Python34\\Scripts\\pip-script.py\", line 9, in <module>\n    load_entry_point('pip==6.0.4', 'console_scripts', 'pip')()\n  File \"C:\\Python34\\lib\\site-packages\\pip-6.0.4-py3.4.egg\\pip\\__init__.py\", line\n 217, in main\n    return command.main(cmd_args)\n  File \"C:\\Python34\\lib\\site-packages\\pip-6.0.4-py3.4.egg\\pip\\basecommand.py\", l\nine 122, in main\n    write_debug_log = check_path_owner(debug_log_path, os.geteuid())\nAttributeError: 'module' object has no attribute 'geteuid'\n```\n\nother commands can not work also.\n\n", "before_files": [{"content": "import os.path\n\nfrom pip.compat import get_path_uid\n\n\ndef check_path_owner(path, uid):\n    previous = None\n    while path != previous:\n        if os.path.lexists(path):\n            # Actually do the ownership check\n            try:\n                if get_path_uid(path) != os.geteuid():\n                    return False\n            except OSError:\n                return False\n            return True\n        else:\n            previous, path = path, os.path.dirname(path)\n", "path": "pip/utils/filesystem.py"}]}