[Libguestfs] Does anybody know how to use the getxattr/setxattr commmands in guestfish?
Richard W.M. Jones
rjones at redhat.com
Thu Apr 8 09:07:11 UTC 2010
On Thu, Apr 08, 2010 at 09:01:31AM +0100, Richard W.M. Jones wrote:
> On Thu, Apr 08, 2010 at 09:49:26AM +0800, Pengzhen Cao wrote:
> > Hi All,
> >
> > Does anybody know how to use the getxattr/setxattr commands in guestfish?
> > It seems not working for ext2/3 filesystem. I did not find the
> > corresponding commands in bash either.
> > So is it for xfs only?
>
> Not just for xfs, this should work for ext2/3 as well.
>
> The problem is you cannot just create any xattr. The kernel will only
> recognize certain xattrs on files, so it's probably best to read the
> attr(5) manual page first.
In particular in order to set user.* attributes, you have to mount the
filesystem with the user_xattr option. The example guestfish script
below shows how to do it.
$ /tmp/test.fish
Extended attributes before setting
Extended attributes after setting
[0] = {
attrname: user.test
attrval: hello
}
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines. Boot with a
live CD or over the network (PXE) and turn machines into Xen guests.
http://et.redhat.com/~rjones/virt-p2v
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#!/usr/bin/guestfish -f
sparse /tmp/test.img 10M
run
part-disk /dev/sda mbr
mkfs ext3 /dev/sda1
mount-options user_xattr /dev/sda1 /
touch /test
echo "Extended attributes before setting"
getxattrs /test
setxattr user.test hello 5 /test
echo "Extended attributes after setting"
getxattrs /test
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