Re: Make a unique filesystem path, without creating the file

From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Subject	Re: Make a unique filesystem path, without creating the file
Date	2016-02-23 06:04 +1100
Message-ID	<mailman.46.1456167850.20994.python-list@python.org> (permalink)
References	(3 earlier) <85mvr26dij.fsf@benfinney.id.au> <mailman.44.1456164660.20994.python-list@python.org> <slrnncmkag.16b.jon+usenet@wintry.unequivocal.co.uk> <mailman.45.1456165511.20994.python-list@python.org> <slrnncmllh.16b.jon+usenet@wintry.unequivocal.co.uk>

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On Tue, Feb 23, 2016 at 5:39 AM, Jon Ribbens
<jon+usenet@unequivocal.co.uk> wrote:
> On 2016-02-22, Chris Angelico <rosuav@gmail.com> wrote:
>> On Tue, Feb 23, 2016 at 5:17 AM, Jon Ribbens
>><jon+usenet@unequivocal.co.uk> wrote:
>>> Weeeeeell, I have a lot of sympathy for that point, but on the other
>>> hand the whole concept of UUIDs ("import uuid") is predicated on the
>>> opposite assumption.
>>
>> Not quite opposite. Ethan is asserting that you cannot be *certain*
>> without actually checking the FS; the point of UUIDs is that you can
>> be fairly *confident* that there won't be a collision. There is a
>> nonzero probability of accidental collisions, and if an attacker is
>> deliberately trying to _force_ a collision, it's most definitely
>> possible. So both views are correct.
>
> I was under the impression that the point of UUIDs is that you can be
> *so* confident that there won't be a collision that for all practical
> purposes it's indistinguishable from being certain.

Maybe, if everyone's cooperating. I'm not sure how they fare in the
face of malice though.

ChrisA

Thread

Re: Make a unique filesystem path, without creating the file Ethan Furman <ethan@stoneleaf.us> - 2016-02-22 10:11 -0800
  Re: Make a unique filesystem path, without creating the file Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-02-22 18:17 +0000
    Re: Make a unique filesystem path, without creating the file Chris Angelico <rosuav@gmail.com> - 2016-02-23 05:25 +1100
      Re: Make a unique filesystem path, without creating the file Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-02-22 18:39 +0000
        Re: Make a unique filesystem path, without creating the file Marko Rauhamaa <marko@pacujo.net> - 2016-02-22 20:48 +0200
          Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve@pearwood.info> - 2016-02-23 10:37 +1100
            Re: Make a unique filesystem path, without creating the file Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-02-23 00:08 +0000
              Re: Make a unique filesystem path, without creating the file Chris Angelico <rosuav@gmail.com> - 2016-02-23 11:18 +1100
                Re: Make a unique filesystem path, without creating the file Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-02-23 00:26 +0000
                Re: Make a unique filesystem path, without creating the file Chris Angelico <rosuav@gmail.com> - 2016-02-23 11:33 +1100
                Re: Make a unique filesystem path, without creating the file Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-02-23 00:44 +0000
                Re: Make a unique filesystem path, without creating the file Chris Angelico <rosuav@gmail.com> - 2016-02-23 11:56 +1100
        Re: Make a unique filesystem path, without creating the file Chris Angelico <rosuav@gmail.com> - 2016-02-23 06:04 +1100
          Re: Make a unique filesystem path, without creating the file Paul Rubin <no.email@nospam.invalid> - 2016-02-22 11:22 -0800
            Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve@pearwood.info> - 2016-02-23 10:45 +1100
          Re: Make a unique filesystem path, without creating the file Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-02-22 19:22 +0000
            Re: Make a unique filesystem path, without creating the file Marko Rauhamaa <marko@pacujo.net> - 2016-02-22 21:32 +0200
              Re: Make a unique filesystem path, without creating the file Random832 <random832@fastmail.com> - 2016-02-22 14:41 -0500
                Re: Make a unique filesystem path, without creating the file Marko Rauhamaa <marko@pacujo.net> - 2016-02-22 22:41 +0200
                Re: Make a unique filesystem path, without creating the file Paul Rubin <no.email@nospam.invalid> - 2016-02-22 13:05 -0800
                Re: Make a unique filesystem path, without creating the file Marko Rauhamaa <marko@pacujo.net> - 2016-02-22 23:22 +0200
                Re: Make a unique filesystem path, without creating the file Paul Rubin <no.email@nospam.invalid> - 2016-02-22 15:26 -0800
              Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve@pearwood.info> - 2016-02-23 11:33 +1100
                Re: Make a unique filesystem path, without creating the file Marko Rauhamaa <marko@pacujo.net> - 2016-02-23 08:54 +0200
                Re: Make a unique filesystem path, without creating the file Paul Rubin <no.email@nospam.invalid> - 2016-02-22 23:18 -0800
                Re: Make a unique filesystem path, without creating the file Marko Rauhamaa <marko@pacujo.net> - 2016-02-23 21:04 +0200
                Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve@pearwood.info> - 2016-02-24 12:40 +1100
                Re: Make a unique filesystem path, without creating the file Marko Rauhamaa <marko@pacujo.net> - 2016-02-24 09:20 +0200
                Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-02-25 16:38 +1100
                Re: Make a unique filesystem path, without creating the file Marko Rauhamaa <marko@pacujo.net> - 2016-02-25 08:54 +0200
                Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-02-25 19:21 +1100
                Re: Make a unique filesystem path, without creating the file Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-02-25 10:05 +0000
            Re: Make a unique filesystem path, without creating the file Chris Angelico <rosuav@gmail.com> - 2016-02-23 06:37 +1100
            Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve@pearwood.info> - 2016-02-23 11:03 +1100
              Re: Make a unique filesystem path, without creating the file Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-02-23 00:11 +0000
              Re: Make a unique filesystem path, without creating the file Paul Rubin <no.email@nospam.invalid> - 2016-02-22 18:27 -0800
                Re: Make a unique filesystem path, without creating the file Chris Angelico <rosuav@gmail.com> - 2016-02-23 13:53 +1100
                Re: Make a unique filesystem path, without creating the file Paul Rubin <no.email@nospam.invalid> - 2016-02-22 19:26 -0800
                Re: Make a unique filesystem path, without creating the file Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-02-23 08:09 +0000
                Re: Make a unique filesystem path, without creating the file Paul Rubin <no.email@nospam.invalid> - 2016-02-23 00:22 -0800
                Re: Make a unique filesystem path, without creating the file Peter Otten <__peter__@web.de> - 2016-02-23 09:40 +0100
                Re: Make a unique filesystem path, without creating the file Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-02-23 09:00 +0000
                Re: Make a unique filesystem path, without creating the file Grant Edwards <invalid@invalid.invalid> - 2016-02-23 15:14 +0000
                Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve@pearwood.info> - 2016-02-25 11:41 +1100
                Re: Make a unique filesystem path, without creating the file Random832 <random832@fastmail.com> - 2016-02-25 10:03 -0500
    Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve@pearwood.info> - 2016-02-23 11:18 +1100

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