Fwd: --link-dest does not appear to be linking on Cygwin

[Kevin Korb]

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If rsync thinks the permissions are different and you told it to
preserve the permissions then it can't hard link.  The permissions are
on the actual file not the links so it can't store a file with 2 sets
of permissions without storing 2 copies of the file.

So, either fix the permission issue (you probably can't) or don't tell
rsync to sync the permissions (--perms which is part of your -a)

On 06/05/12 17:18, Clint Olsen wrote:
> Ok, itemize changes prints out some info for each file, and it
> looks like:
> 
> cf...p..... Nancy/Favorites/Links/desktop.ini cf...p.....
> Nancy/Favorites/Links/latin music.url cd...p.....
> Nancy/Favorites/Microsoft Websites/
> 
> I did a quick search on this switch and someone was bitching that
> the fields were not easy to decipher w/o reading the source code
> :)
> 
> 'P' would appear to be permissions. I do get a couple of 
> warnings/errors about not being able to preserve all attributes
> during the copy, but the permissions should not be changing...
> 
> Thanks,
> 
> -Clint
> 
> On Tue, Jun 5, 2012 at 2:10 PM, Clint Olsen <clint.olsen at gmail.com>
> wrote:
>> Hi:
>> 
>> I will try the itemize switch as you suggested, thanks...
>> 
>> I have tested this on both the Windows box and the NAS. The
>> inode numbers come back differently on Cygwin but the NAS sees
>> them as the same:
>> 
>> Nancy at macki /cygdrive/f/macki/test $ ls -ali total 1048576 
>> 3297336581512553257 drwxr-xr-x 1 Nancy None 0 Jun  5 11:37 . 
>> 16963795924520120485 drwxr-xr-x 1 Nancy None 0 Jun  5 14:07 .. 
>> 5321094878451953619 -rw-r--r-- 1 Nancy None 4 Jun  5 10:57 foo 
>> 9211568837569774878 -rw-r--r-- 1 Nancy None 4 Jun  5 10:57 foo1 
>> 9211568837569774879 -rw-r--r-- 1 Nancy None 4 Jun  5 10:57 foo2 
>> 3595967447105090765 -rw-r--r-- 1 Nancy None 4 Jun  5 10:57
>> foolink
>> 
>> NAS> cd /volume1/Backup/macki/test/ NAS> ls -ali 16678913
>> drwxrwxrwx    2 nancy    users         4096 Jun  5 11:37 . 
>> 8814593 drwxrwxrwx    5 nancy    users         4096 Jun  5 14:07
>> .. 16678915 -rwxrwxrwx    4 nancy    users            4 Jun  5
>> 10:57 foo 16678915 -rwxrwxrwx    4 nancy    users            4
>> Jun  5 10:57 foo1 16678915 -rwxrwxrwx    4 nancy    users
>> 4 Jun  5 10:57 foo2 16678915 -rwxrwxrwx    4 nancy    users
>> 4 Jun  5 10:57 foolink
>> 
>> The final file "foolink" was created using a C program ala:
>> 
>> $ cat link.c #include <unistd.h> #include <stdio.h>
>> 
>> int main(void) { if (link("/cygdrive/f/macki/test/foo", 
>> "/cygdrive/f/macki/test/foolink") == 0) { printf("Link was
>> successful\n"); } else { printf("Link was not successful\n"); } 
>> return 0; }
>> 
>> Thanks,
>> 
>> -Clint
>> 
>> On Tue, Jun 5, 2012 at 2:06 PM, Kevin Korb <kmk at sanitarium.net>
>> wrote:
> --itemize-changes would be the first place to start.  Also, see if
> you can make a hard link on your NAS.  Just because the underlying
> ext4 supports it doesn't mean that your network mount does.  Try
> something like:
> 
> cd /cygdrive/f/macki touch testfile ln testfile testfile2 ls -ls
> testfile testfile2
> 
> They should both have the same inode number.
> 
> On 06/05/12 17:02, Clint Olsen wrote:
>>>>> Hi:
>>>>> 
>>>>> I have attempted to following some instructions to use
>>>>> --link-dest in order to preserve space for multiple
>>>>> backups. I'm using rsync on Cygwin with a NAS (ext4) which
>>>>> does support hard-links on the filesystem. I've written a
>>>>> short program that does attempt to create a hard-link on
>>>>> this NAS from Cygwin and it does look to be working. If I
>>>>> run ls -li on the NAS the inodes are the same. However, on
>>>>> Cygwin the inodes returned are not. I assumed that what's
>>>>> important is that the NAS handles the hard-links
>>>>> correctly.
>>>>> 
>>>>> I checked the archives and it looks like a common mistake
>>>>> is inconsistent usage of the trailing backslash. My usage
>>>>> looks something like:
>>>>> 
>>>>> % rsync -aP --delete --delete-excluded 
>>>>> --exclude-from=/home/Nancy/.rsync/exclude 
>>>>> --link-dest=/cygdrive/f/macki/current/ Nancy 
>>>>> /cygdrive/f/macki/incomplete-back-2012-06-05T13:53:51
>>>>> 
>>>>> I'm running this from "/cygwin/c/Documents and Settings/" 
>>>>> directory, and the directory under the symlink "current"
>>>>> is "Nancy".
>>>>> 
>>>>> Is there a way to tell if rsync thinks it's found a match
>>>>> and attempting to link?
>>>>> 
>>>>> Thanks,
>>>>> 
>>>>> -Clint
> 
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- -- 
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	Kevin Korb			Phone:    (407) 252-6853
	Systems Administrator		Internet:
	FutureQuest, Inc.		Kevin at FutureQuest.net  (work)
	Orlando, Florida		kmk at sanitarium.net (personal)
	Web page:			http://www.sanitarium.net/
	PGP public key available on web site.
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