make sure file copies are consistent e.g. during Archive creation to try hard to avoid timestamp differences between metadata and on disk versions.

git-svn-id: svn+ssh://svn.code.sf.net/p/migrid/code/trunk@6044 b75ad72c-e7d7-11dd-a971-7dbc132099af

Author: jonasbardino

mig/shared/fileio.py

@@ -617,14 +617,16 @@ def _copy_helper(src, dst, configuration, recursive):
     """Copy a file or directory from src to dst where dst must be a new
     file/dir path and the parent dir is created if necessary. The recursive
     flag enables recursive copy.
+    We use the same 'copy2' helper for single file copies as for the recursive
+    copytree case to always transfer metadata, too.
     """
     dst_dir = os.path.dirname(dst)
     makedirs_rec(dst_dir, configuration)
     try:
         if recursive:
             shutil.copytree(src, dst)
         else:
-            shutil.copy(src, dst)
+            shutil.copy2(src, dst)
     except Exception as exc:
         return (False, "copy %r %r failed: %s" % (src, dst, exc))
     return (True, "")