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Re: delete-file to trash

From: Harald Hanche-Olsen
Subject: Re: delete-file to trash
Date: Sun, 23 May 2010 10:54:35 -0400 (EDT)

+ Adrian Robert <address@hidden>:

> Regarding trapping, Time Machine uses standard unix hard links, and
> the default FS format for Mac OS is HFS+, the specs for which are
> published here
> (http://developer.apple.com/mac/library/technotes/tn/tn1150.html);
> a GNU/linux driver has been developed.

Actually, it is a bit more complicated than that. As an optimization
feature, if a directory and all its contents are unchanged since the
previous backup, that directory in the latest backup becomes a hard
link to the corresponding directory in the previous backup. This is
one reason Time Machine can only use HFS volumes for Time Machine.

; ls -1id */mach/System
14828147 2010-05-19-062015/mach/System/
14828147 2010-05-20-083504/mach/System/
15557200 2010-05-21-184651/mach/System/
15557200 2010-05-22-075716/mach/System/
15808642 2010-05-22-131850/mach/System/
15808642 2010-05-22-144139/mach/System/
15808642 2010-05-22-154126/mach/System/
15808642 2010-05-22-164134/mach/System/

- Harald

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