On Tue, Jun 9, 2009 at 6:54 PM, David Lutterkort <lut...@redhat.com> wrote:
>
> On Tue, 2009-06-09 at 11:57 -0400, Bryan Kearney wrote:
> > Ok.. lets try this (lutter knows this voodoo better)
>
> It's not voodoo, it's XPath ;)
>
> > "match *[alias ='usb-storage'] size = 0 "
>
> That almost works, though shouldn't that second '=' be '==' ? (and maybe
> we should make the augeas provider use '=' there, too, for consistency)
>
> I would write this as
>
> augeas { "usb-storage":
> context => "/files/etc/modprobe.conf",
> changes => [ "set alias[last()+1] usb-storage",
> "set alias[last()]/modulename off",
> ],
> onlyif => "match alias[.='usb-storage'] size == 0'
> }
>
> The fact that the modprobe.conf format is 'command args' with differing
> meanings of the args for the various commands doesn't matter too much -
> it just leads to different tree structures for those commands. For
> example for the command 'alias NAME MODULE' the tree structure is
>
> alias = 'NAME'
> modulename = 'MODULE'
>
> IOW, the name of the alias becomes the value of the 'alias' node, and
> the name of the module is put as the value of a node labelled
> 'modulename'.
>
> David
>
>
> That doesn't quite work either:
### print /files/etc/modprobe.conf
...
/files/etc/modprobe.conf/alias[5] = "usb-storage"
/files/etc/modprobe.conf/alias[5]/modulename = "off"
augtool> match /files/etc/modprobe.conf/alias[='usb-storage']
(error matching /files/etc/modprobe.conf/alias[='usb-storage'])
augtool>
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