Steven D'Aprano wrote:
I'm trying to safely rename a file without over-writing any existing
files, and I've run into a problem with file locks. Here's a naive way of
renaming without over-writing
By default on a Linux filesystem, flock() gives you an _advisory_ lock.
Other processes can touch
On Dec 6, 12:25 am, Steven D'Aprano <[EMAIL PROTECTED]
cybersource.com.au> wrote:
> The rename works, but here is my problem: after getting what I thought
> was an exclusive lock on the new file, but before calling os.rename(), I
> can still over-write it from another process:
>
> $ echo "this com
Steven D'Aprano wrote:
import os, fcntl
oldname = "ham.txt"
newname = "spam.txt"
def lock_destination(name):
fileno = os.open(name, os.O_CREAT | os.O_EXCL)
fcntl.flock(fileno, fcntl.LOCK_EX) # POSIX systems only
return fileno
# Create a test file to be renamed.
f = open(oldname, '
