python的shutil.copyfile()是原子的吗? [英] Is python's shutil.copyfile() atomic?

问题描述

我正在编写一个python脚本，该脚本使用 shutil复制文件.在Linux上为copyfile().在复制过程中，其他进程可能正在尝试读取文件.以下内容足以确保外部进程不会损坏文件的视图吗?

I'm writing a python script that copies a file using shutil.copyfile() on Linux. During the copying, other processes may be trying to read the file. Is the following sufficient to ensure that an external process doesn't get a corrupted view of the file?

os.unlink(dest)
shutil.copyfile(src, dest)

也就是说，shutil.copyfile()是原子的，以便其他进程在复制操作完成之后才能读取目标文件吗?

That is, is shutil.copyfile() atomic such that other processes cannot read the destination file until after the copy operation is complete?

推荐答案

不，似乎只是对于原子复制操作，应将文件复制到同一文件系统上的其他位置，然后将os.rename()复制到所需的位置(在Linux中，保证 是原子的)

For an atomic copy operation, you should copy the file to a different location on the same filesystem, and then os.rename() it to the desired location (which is guaranteed to be atomic on Linux).

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