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Re: Recursively recreate hierarchy with NTFS hardlinks by Cygwin
- From: Oleksandr Gavenko <gavenkoa at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Wed, 02 Aug 2017 14:50:01 +0300
- Subject: Re: Recursively recreate hierarchy with NTFS hardlinks by Cygwin
- Authentication-results: sourceware.org; auth=none
- References: <86efsu19xs.fsf@gavenkoa.example.com>
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!
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