checkout: use os.path.samefile instead of stat

Signed-off-by: Ruslan Kuprieiev <[email protected]>

dvc/command/checkout.py

@@ -1,5 +1,4 @@
 import os
-from stat import ST_INO, ST_DEV
 
 from dvc.command.base import CmdBase, DvcLock
 from dvc.logger import Logger
@@ -17,10 +16,7 @@ class CmdCheckout(CmdBase):
         if not os.path.isfile(data) or not os.path.isfile(cache):
             return False
 
-        data_st = os.stat(data)
-        cache_st = os.stat(cache)
-
-        if (data_st[ST_INO], data_st[ST_DEV]) != (cache_st[ST_INO], cache_st[ST_DEV]):
+        if not System.samefile(data, cache):
             return False
 
         return True

dvc/system.py

@@ -23,6 +23,13 @@ class System(object):
 
         raise Exception('Not Implemented Yet')
 
+    @staticmethod
+    def samefile(path1, path2):
+        if System.is_unix():
+            return os.path.samefile(path1, path2)
+
+        raise Exception('Not Implemented Yet')
+
     @staticmethod
     def realpath(path):
         # It is definitely not the best way to check a symlink.