[augeas-devel] Inconsistent matching of multiple predicates (involving last/position)

[Dominic Cleal]

On 28/08/15 09:50, Mol, Xavier (SCC) wrote:
> What Augeas version?
> 	augeas-1.0.0-10.el6.x86_64

This is quite old, it appears to have been fixed some time since.

> augtool> defvar master /files/etc/auto.master
> augtool> match $master/*[map]
> /files/etc/auto.master/1 = /misc
> /files/etc/auto.master/2 = /net
> /files/etc/auto.master/3 = +
> augtool> match $master/*[label() != '#comment']
> /files/etc/auto.master/1 = /misc
> /files/etc/auto.master/2 = /net
> /files/etc/auto.master/3 = +
> 
> **)
> augtool> match $master/*[map][last()]
> /files/etc/auto.master/3 = +
> augtool> match $master/*[map][position() = 2]
> /files/etc/auto.master/2 = /net
> augtool> match $master/*[label() != '#comment'][last()]
>   (no matches)

On 1.4.0:

augtool> match $master/*[label() != '#comment'][last()]
/files/etc/auto.master/3 = +

> augtool> match $master/*[label() != '#comment'][position() = 2]
>   (no matches)

augtool> match $master/*[label() != '#comment'][position() = 3]
/files/etc/auto.master/1 = /misc
augtool> match $master/*[label() != '#comment'][position() = 6]
/files/etc/auto.master/2 = /net

I'd guess position() is the position under the original node, not in the
filtered results (!= '#comment').

A git bisect would probably narrow down which commit fixed it, as I
can't remember now.  If you need it fixed in el6, please file a BZ with
Red Hat.

-- 
Dominic Cleal
Red Hat Engineering