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Re: [Issue 2746] New - update overwrites w/o warning local modification if local timestamp did not change

From: Greg Hudson <ghudson_at_MIT.EDU>
Date: 2007-03-23 19:47:16 CET

On Wed, 2007-03-21 at 21:49 +0100, Erik Huelsmann wrote:
> Ben Reser tells me ctime updating can be turned off on many
> filesystems and many admins seem to do so.

That comment sounds confused. You can turn off atime updating for
performance and many people do; there's no reason I know of to turn off
ctime updating.

There does seem to be a real issue here:

  svn update
  mv file1 file2 # file1 has same size and mtime as file2
  svn rm file1
  svn st # file2 appears unchanged
  svn update # Smashes file2

It may be an uncommon case, but there's no broken tool involved, and
mv's behavior isn't going to change.

I agree that all proposed solutions have serious drawbacks. Using ctime
means working copies become slow after a filesystem backup, until
cleanup is run. Using inodes mean working copies become slow after a
copy operation (even a well-executed one which preserves mtimes), until
cleanup is run. Doing a full compare all the time means working copies
are always slow.

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Received on Fri Mar 23 19:48:25 2007

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