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Date:	Mon, 23 May 2016 12:18:34 +0300
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Subject:	=?UTF-8?Q?Re=3A_tar_incremental_backups_and_ctime=E2=80=8F_problem?=
From:	x y <x1y2w3 AT gmail DOT com>
To:	cygwin AT cygwin DOT com
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It is not clear to me your expectation:
- are you asking how to use ctime to select the file with tar alone ?
  It is not possible for my understanding of the manual.

- Are you asking the package maintainer to change the behaviour of
  cygwin tar ? Unlikely to happen, but I leave to him.

Regards
Marco


Hi Marco,

Sorry, I am new to the mailing list. If I am not wrong, tar is
checking both of the ctime and mtime values to compare files during
incremental backups. Since opening and closing a MS document without
changing the content updates ctime, it would be preferable to add a
new option to tar to use only mtime for file comparing during
incremental backups.

On Mon, May 23, 2016 at 12:06 PM, Marco Atzeri <marco DOT atzeri AT gmail DOT com> wrote:
> On 23/05/2016 10:54, x y wrote:
>>
>> Hi Marco,
>>
>> Thanks for your reply. The problem is that there are a lot of files to
>> be checked so replacing ctime by time to support tar incremental
>> backup should be more practical.
>
>
> Bottom post on this mailing list, please.
>
> It is not clear to me your expectation:
> - are you asking how to use ctime to select the file with tar alone ?
>   It is not possible for my understanding of the manual.
>
> - Are you asking the package maintainer to change the behaviour of
>   cygwin tar ? Unlikely to happen, but I leave to him.
>
> Regards
> Marco
>
>
>
>>
>> On Mon, May 23, 2016 at 11:46 AM, Marco Atzeri <marco DOT atzeri AT gmail DOT com>
>> wrote:
>>>
>>> On 23/05/2016 10:40, x y wrote:
>>>>
>>>>
>>>> Hello,
>>>>
>>>> The MS Office applications are changing the ctime value of .doc and
>>>> .xls files even if they are not modified. Opening and closing an
>>>> office file without modifying the content is changing ctime and the
>>>> unmodified document is included in the incremental tar archive. Could
>>>> it be possible to use the mtime value instead of ctime to avoid the
>>>> the reappearance of the unchanged files in the incremental archive?
>>>>
>>>> Test OS  : Windows 7 Sp1
>>>>
>>>
>>>
>>> find -ctime should be able you to build the list of files
>>> that are changed and that tar should process
>>>
>>> Regards
>>> Marco
>>>
>
>
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