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To: cygwin AT cygwin DOT com
From: Oleksandr Gavenko <gavenkoa AT gmail DOT com>
Subject: Re: Recursively recreate hierarchy with NTFS hardlinks by Cygwin
Date: Wed, 02 Aug 2017 14:50:01 +0300
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On 2017-08-02, Oleksandr Gavenko wrote:

> On Linux I uses:
>
>   cp -al /backup/proj/DATEOLD  /backup/proj/DATENEW
>   rsync ... /home/user/proj/ /backup/proj/DATENEW/
>
> and employ hardlinks to preserve space.
>
> ``rsync --hard-links`` isn't reliable:
>
>   bash# echo 1 >orig.txt
>
>   bash# rsync -a --hard-links orig.txt new.txt
>
>   bash# echo 2 >>orig.txt
>
>   bash# diff -u orig.txt new.txt
>   --- orig.txt    2017-08-02 14:04:36.976875300 +0300
>   +++ new.txt     2017-08-02 14:04:16.547209000 +0300
>   @@ -1,2 +1 @@
>    1
>   -2
>

Experiments shown that my goal can be archived in single command:

  mkdir orig
  echo 1 >>orig/my.txt

  mkdir backup
  rsync -a orig/ backup/1
  rsync -a --link-dest=../1 orig/ backup/2

  echo 2 >>backup/2/my.txt
  cmp backup/1/my.txt backup/2/my.txt && echo ok
  cmp orig/my.txt backup/2/my.txt || echo ok

Thanks for Cygwin & rsync with NTFS link support!

-- 
http://defun.work/


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