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Re: dd question, what am I doing wrong?



Patrick O'Callaghan wrote:
On Fri, 2009-12-04 at 16:13 -0800, Daniel B. Thurman wrote:
The problem I have specifically with rsync (or tar, or cp) is that
it does not save ACLs, file attributes too well, and so on that I
gave up using it.  Perhaps the problem in this case is not to use
the -a option but to use the manual options to save everything
about the files that you can.

Specifically:
rsync manual:
-a, --archive        archive mode; equals -rlptgoD (no -H,-A,-X)
-H, --hard-links   preserve hard links
-A, --acls             preserve ACLs (implies -p)
-X, --xattrs          preserve extended attributes

Do you mean that you've tried these (particularly -A and -X) and they
don't work? If so, have you filed a bug report?
I am not certain that it's a bug per-se, it's just that there are
cases, or so it seems, where it is not clear how to deal with
the issue on my part.  For example, hard links (-H).  How are
hard links handled on one drive to be copied over to another
and is it guaranteed to work?  I could not get my mind around
this one so I did not want to take a chance.  As for ACLs (-A),
what exactly is being handled here and does this work for ALL
Oses concerned - do they follow the same "standard"?  I am thinking
about Vista in particular, so I did not want to experiment on this
one either.  As for extended attributes (-X), I have no clue exactly
what this is.  I guess I have to someday take the time to do more
research before messing around with these rsync options.  This is a
particular reason why I am using dd/rescue & resizing - it works sans
Vista, which I have yet to try.
Also, have you looked at [1] wrt copying while maintaining SElinux
contexts?

[1]
http://docs.fedoraproject.org/selinux-user-guide/f10/en-US/sect-Security-Enhanced_Linux-Working_with_SELinux-Maintaining_SELinux_Labels_.html

Yes, I am familiar with SeLinux to a point of creating them and
"permentizing" them.  Symbolic links are one of the nasty ones that
take some getting used to though.

Dan


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