[Python-ideas] BackupFile (original) (raw)
Christian Heimes lists at cheimes.de
Mon Jun 25 15:59:40 CEST 2012
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Am 25.06.2012 14:17, schrieb Kim Gräsman:
Hello,
I'm new here, so forgive me if this has been discussed before or is off-topic. I came up with a mechanism that I thought might be useful in the Python standard library -- a scope-bound self-restoring backup file. I came to this naïve implementation;
Are you aiming for atomic file rollover backed by a temporary file? That's the common way to safely overwrite an existing file. It works differently than your code.
Create a temporary file with O_CREAT | O_EXCL in the same directory as the file you like to replace
Write data to new file
Call sync() on the file as well as fdatasync() and fsync() on the file descriptor
close the file
use atomic rename to replace the old file with the new file (IIRC won't work atomically on Windows)
I've some code laying around somewhere that implements a RolloverFile similar to tempfile.NamedTemporaryFile.
Christian
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