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Re: shutil.copyfile is incomplete (truncated)

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Date Fri, 12 Apr 2013 11:15:50 +1000
From Cameron Simpson <cs@zip.com.au>
To Steven D'Aprano <steve+comp.lang.python@pearwood.info>
Subject Re: shutil.copyfile is incomplete (truncated)
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On 12Apr2013 00:06, Steven D'Aprano <steve+comp.lang.python@pearwood.info> wrote:
| On Thu, 11 Apr 2013 19:55:53 +0000, Neil Cerutti wrote:
| > On 2013-04-11, Rob Schneider <rmschne@gmail.com> wrote:
| >> Thanks. Yes, there is a close function call  before the copy is
| >> launched. No other writes. Does Python wait for file close command to
| >> complete before proceeding?
| > 
| > The close method is defined and flushing and closing a file, so it
| > should not return until that's done.
| 
| But note that "done" in this case means "the file system thinks it is 
| done", not *actually* done.

Unless there's a reboot (or crash) in between, the view from the
app should be consistent and correct.

| Hard drives, especially the cheaper ones, 
| lie. They can say the file is written when in fact the data is still in 
| the hard drive's internal cache and not written to the disk platter. 
| Also, in my experience, hardware RAID controllers will eat your data, and 
| then your brains when you try to diagnose the problem.
| 
| I would consider the chance that the disk may be faulty, or the file 
| system is corrupt. Does the problem go away if you write to a different 
| file system or a different disk?

Or that the filesystem may be full? Of course, that's usually obvious
more widely when it happens...

Question: is the size of the incomplete file a round number? (Like
a multiple of a decent sized power of 2>)

Cheers,
-- 
Cameron Simpson <cs@zip.com.au>

I am now convinced that theoretical physics is actual philosophy.
        - Max Born

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Thread

shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-11 11:12 -0700
  Re: shutil.copyfile is incomplete (truncated) Neil Cerutti <neilc@norwich.edu> - 2013-04-11 18:53 +0000
    Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-11 12:07 -0700
      Re: shutil.copyfile is incomplete (truncated) Neil Cerutti <neilc@norwich.edu> - 2013-04-11 19:55 +0000
        Re: shutil.copyfile is incomplete (truncated) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-04-12 00:06 +0000
          Re: shutil.copyfile is incomplete (truncated) Cameron Simpson <cs@zip.com.au> - 2013-04-12 11:15 +1000
          Re: shutil.copyfile is incomplete (truncated) Ned Deily <nad@acm.org> - 2013-04-11 18:33 -0700
            Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-11 23:32 -0700
              Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-11 23:53 -0700
                Re: shutil.copyfile is incomplete (truncated) Ned Deily <nad@acm.org> - 2013-04-12 00:53 -0700
              Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-11 23:53 -0700
              Re: shutil.copyfile is incomplete (truncated) Cameron Simpson <cs@zip.com.au> - 2013-04-12 18:26 +1000
                Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-12 02:18 -0700
                Re: shutil.copyfile is incomplete (truncated) Chris Angelico <rosuav@gmail.com> - 2013-04-12 19:22 +1000
                Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-12 05:07 -0700
                Re: shutil.copyfile is incomplete (truncated) Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-04-12 13:18 +0100
                Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-12 05:07 -0700
                Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-12 02:18 -0700
                Re: shutil.copyfile is incomplete (truncated) Roy Smith <roy@panix.com> - 2013-04-12 10:57 -0400
                Re: shutil.copyfile is incomplete (truncated) Roy Smith <roy@panix.com> - 2013-04-12 10:54 -0400
            Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-11 23:32 -0700
              Re: shutil.copyfile is incomplete (truncated) Roy Smith <roy@panix.com> - 2013-04-12 10:47 -0400
          Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-11 23:27 -0700
          Re: shutil.copyfile is incomplete (truncated) Roy Smith <roy@panix.com> - 2013-04-12 10:51 -0400
          Re: shutil.copyfile is incomplete (truncated) 88888 Dihedral <dihedral88888@googlemail.com> - 2013-04-12 08:49 -0700
          Re: shutil.copyfile is incomplete (truncated) Nobody <nobody@nowhere.com> - 2013-04-13 03:33 +0100
            Re: shutil.copyfile is incomplete (truncated) Chris Angelico <rosuav@gmail.com> - 2013-04-13 13:05 +1000
            [OT] Lying hard drives [was Re: shutil.copyfile is incomplete (truncated)] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-04-13 03:17 +0000
              Re: [OT] Lying hard drives [was Re: shutil.copyfile is incomplete (truncated)] Chris Angelico <rosuav@gmail.com> - 2013-04-13 13:43 +1000
        Re: shutil.copyfile is incomplete (truncated) Rob Schneider <rmschne@gmail.com> - 2013-04-11 23:25 -0700
          Re: shutil.copyfile is incomplete (truncated) Chris Angelico <rosuav@gmail.com> - 2013-04-12 17:32 +1000
          Re: shutil.copyfile is incomplete (truncated) Terry Jan Reedy <tjreedy@udel.edu> - 2013-04-12 10:48 -0400

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