[augeas-devel] Re: [config-model-users] Semantic problem in augeas sshd lens ?

[Raphaël Pinson]

On Fri, Aug 1, 2008 at 7:05 PM, David Lutterkort <dlutter at redhat.com> wrote:

> On Fri, 2008-08-01 at 15:05 +0200, Raphaël Pinson wrote:
>
>
> >         And this notation is only valid for "leaf". As "higher" level
> >         arrays like
> >         /etc/host/ use another notation even with only one element in
> >         the array:
> >
> >         augtool> print /files/etc/hosts
> >         /files/etc/hosts
> >         /files/etc/hosts/1
> >         /files/etc/hosts/1/ipaddr = "127.0.0.1"
> >         /files/etc/hosts/1/canonical = "localhost"
> >         /files/etc/hosts/1/alias = "localhost"
> >
> >
> > No, this is not another notation. /files/etc/hosts/1
> > and /files/etc/hosts/2 are not two /etc/hosts files ;) In the first
> > case, Subsystem was declared using "label" (or most likely "key",
> > which gives the same result), resulting in the same of the label being
> > used to refer to an array of values. In the second case, "seq" was
> > used because the file is only made of the same kind of entries. It
> > could have been made into :
> >
> > /files/etc/hosts/entry
> > /files/etc/hosts/entry/ipaddr = "127.0.0.1"
> > /files/etc/hosts/entry/canonical = "localhost"
> > /files/etc/hosts/entry/alias = "localhost"
> >
> > which would then give trees like /files/etc/hosts/entry[1]
> > and /files/etc/hosts/entry[2] in the case of multiple entries, but
> > since there's only one kind of entry, it's really useless, hence the
> > use of numbers only to refer to lines (although I'm not a big fan of
> > "seq", I find it harder to parse the tree).
>
> I agree with that, and thought about removing 'seq' completely at some
> point. The reason it's still there has to do with how whitespace is
> preserved: if you have two lines in your /etc/hosts and you do a
> 'rm /files/etc/hosts/1', the remaining line will be restored exactly as
> it was before, because the whitespace for it is keyed off the label of
> the node ('2' when using 'seq')
>
> If you don't use seq and use multiple 'entry' labels instead, and you do
> 'rm /files/etc/hosts/entry[1]', when you save the tree, the remaining
> line will use the whitespace from the first line, since for multiple
> identical labels, the whitespace  is put on a list, and that list is
> consulted in order as entries are restored.


Oh, good to know!


Raphael





>
>
> That is the only reason I still use 'seq' - if it weren't for that I
> would have removed it completely.
>
> David
>
>
>
>
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