From: Karsten Blees <karsten.blees@gmail.com>
Date: Thu, 12 Feb 2015 22:57:30 GMT
Subject: Re: [PATCH 0/3] Win32: nanosecond-precision file times
Message-ID: <54DD2FDA.7030604@gmail.com>
In-Reply-To: <xmqqbnkysygl.fsf@gitster.dls.corp.google.com>

Am 12.02.2015 um 20:48 schrieb Junio C Hamano:
> Karsten Blees <karsten.blees@gmail.com> writes:
> 
>> However, some users have expressed concerns that 'same size and
>> mtime' [2] may theoretically happen by chance in daily operation.
> 
> Hmph.
> 
> Haven't we already accepted that it is not just "may theoretically
> happen" and had counter-measures in racy-git detection machinery
> for quite some time?
> 

Racy-git only triggers for files that are modified at the same time
as .git/index (i.e. we don't know if the stat cache is up to date).

This is more about copying 'old' things around, which usually also
copies mtime on Windows. E.g.:

  # create two files with slightly different mtime
  for i in {1..10}; do (echo "v1" >> test); done &&
  for i in {1..10}; do (echo "v2" >> test2); done
  # wait a bit so that '.git/index' is always newer than 'test' / 'test2'
  sleep 1
  git add test
  git commit -m v1
  # copy test2 over test (similar to 'cp -p', but native 'copy' also
  # copies mtime nanoseconds)
  cmd //c "copy /y test2 test"
  git add test
  git commit -m v2

Without these patches, git does not detect the change, and the second
git add / git commit are noops.

-- 
-- 
*** Please reply-to-all at all times ***
*** (do not pretend to know who is subscribed and who is not) ***
*** Please avoid top-posting. ***
The msysGit Wiki is here: https://github.com/msysgit/msysgit/wiki - Github accounts are free.

You received this message because you are subscribed to the Google
Groups "msysGit" group.
To post to this group, send email to msysgit@googlegroups.com
To unsubscribe from this group, send email to
msysgit+unsubscribe@googlegroups.com
For more options, and view previous threads, visit this group at
http://groups.google.com/group/msysgit?hl=en_US?hl=en

--- 
You received this message because you are subscribed to the Google Groups "Git for Windows" group.
To unsubscribe from this group and stop receiving emails from it, send an email to msysgit+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.