在python中重命名文件导致设备或资源繁忙

Question

I am writing a script with python.

First, let me show you the exception:

Traceback (most recent call last):

File "/home/jiewei/PycharmProjects/TestEngine/test/test_multiple_classes.py", line 23, in test_create_symlink_and_run_test_in_devbench_but_is_called_in_vdi
    self.sm.make_backups(self.dev_path)
File "testengine/SymlinkManger.py", line 24, in make_backups
    self.make_backup(file_path)
File "testengine/SymlinkManger.py", line 19, in make_backup
    os.rename(file_path, new_name)
OSError: [Errno 16] Device or resource busy

Then here are method causing the problem:

def make_backup(self, file_path):
    name = os.path.basename(file_path)
    folder_path = os.path.dirname(file_path)
    if not name.startswith('backup_'):
        new_name = os.path.join(folder_path,"backup_"+name)
        os.rename(file_path, new_name)

def make_backups(self, folder_path):
    for file in folder_path:
        file_path = os.path.join(folder_path, file)
        self.make_backup(file_path)    

Do I need to create threads to solve this problem? I guess the cause is os is been used by multiple progress and this cause the exception.

Thanks for any help!

Answer 1

You definitely don't need threads to solve this. It just looks you're renaming something that is actually in use...

Looking at the Linux manpage for the rename() call , you might get EBUSY (error 16) when renaming a directory that's in use:

The rename fails because oldpath or newpath is a directory that is in use by some process (perhaps as current working directory, or as root directory, or because it was open for reading) or is in use by the system (for example as mount point), while the system considers this an error. (Note that there is no requirement to return EBUSY in such cases—there is nothing wrong with doing the rename anyway—but it is allowed to return EBUSY if the system cannot otherwise handle such situations.)