rattail-project/rattail Changeset

Changeset - 021b17897224

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Lance Edgar - 9 years ago 2015-04-13 23:13:55
ledgar@sacfoodcoop.com

Add `files.locking_copy_test()` function.

The hope is that simplifying the lockout will help with certain network
issues that can plague a certain server I know... If this test is
successful then the `locking_copy()` function will be silently replaced.

1 file changed with 31 insertions and 0 deletions:

rattail/files.py

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rattail/files.py

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@@ @@ -113,6 +113,37 @@ def locking_copy(src, dst, timeout=None): @@
         shutil.copy(src, dst)
 def locking_copy_test(src, dst):
     """
     Implements a "locking" version of the standard library's
     :func:`python:shutil.copy()` function.
     This exists to provide a more atomic method for copying a file into a
     folder which is being watched by a file monitor.  The assumption is that
     the monitor is configured to watch for file "locks" and therefore only
     process files once they have had their locks removed.  See also
     :ref:`filemon-profile-watchlocks`.
     :param src: Path to the source file.
     :type src: string
     :param dst: Path to the destination file (or directory).
     :type dst: string
     """
     if os.path.isdir(dst):
         fn = os.path.basename(src)
         dst = os.path.join(dst, fn)
     lockdir = '{0}.lock'.format(dst)
     try:
         os.mkdir(lockdir)
     except OSError as error:
         if error.errno != 17:   # file exists
             raise
     shutil.copy(src, dst)
     os.rmdir(lockdir)
 def overwriting_move(src, dst):
     """
     Convenience function which is equivalent to ``shutil.move()``, except it

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