[augeas-devel] Yet more novice questions, Re: path expression question

[Patrick Spinler]

NVM, sorry.  I see I had included an extra "/" in my expression.  Found
my error only 2 minutes after sending out my inquiry, of course. :-(

-- Pat, professional botherer of email lists with inane questions

On 9/30/13 4:25 PM, Patrick Spinler wrote:
> 
> Apologies for asking yet another novice question, but if I may, please?
> 
> I'd like to construct an expression to match any iptables nodes with a
> dport = <specific value>.  Here's an example:
> 
> augtool> print /files/etc/sysconfig/iptables/table/append[28]
> /files/etc/sysconfig/iptables/table/append[28] = "Mayo-Firewall-INPUT"
> /files/etc/sysconfig/iptables/table/append[28]/protocol = "tcp"
> /files/etc/sysconfig/iptables/table/append[28]/match = "tcp"
> /files/etc/sysconfig/iptables/table/append[28]/dport = "21"
> /files/etc/sysconfig/iptables/table/append[28]/jump = "ACCEPT"
> 
> So, I thought I'd just have to say somethine like
> 
>   match .../append[*]/*[dport = 'XXXX']
> 
> but I'm not finding what I expect:
> 
> augtool> match /files/etc/sysconfig/iptables/table/append[*]/*[dport = "21"]
>   (no matches)
> augtool> match /files/etc/sysconfig/iptables/table/*/*[dport = "21"]
>   (no matches)
> augtool> match /files/etc/sysconfig/iptables/table/*/*["dport" = "21"]
>   (no matches)
> augtool> match /files/etc/sysconfig/iptables/table/append[28]/*["dport"
> = "21"]
>   (no matches)
> 
> 
> Guidance, please?  (And yes, I have read over the examples in the "Path
> Expressions" page on the hercules-team/augeas Wiki).
> 
> 
> Apologies for the questions,
> -- Pat
> 
> On 9/30/13 3:48 PM, Patrick Spinler wrote:
>>
>> Fantastic, and thank you!  This did indeed do the trick. :-)
>>
>> insert append before "/files/etc/sysconfig/iptables/table/append[. =
>> 'Mayo-Firewall-INPUT'][1]"
>>
>> Thank you muchly for your patience with my novice questions. :-)
>>
>> -- Pat
>>
>> On 9/30/13 3:31 PM, Raphaël Pinson wrote:
>>> Hi Pat,
>>>
>>>
>>> You need to select the first node matching your expression, by filtering
>>> a second time:
>>>
>>> insert append before "/files/etc/sysconfig/
>>> iptables/table/append[position(. =
>>> 'Mayo-Firewall-INPUT')][1]"
>>>
>>>
>>> Regards,
>>>
>>> Raphaël
>>>
>>>
>>>
>>> On Mon, Sep 30, 2013 at 9:54 PM, Patrick Spinler
>>> <spinler.patrick at mayo.edu <mailto:spinler.patrick at mayo.edu>> wrote:
>>>
>>>
>>>     Okay, so I have a structure like this:
>>>
>>>     augtool> ls "/files/etc/sysconfig/iptables/table/"
>>>     chain[1]/ = INPUT
>>>     chain[2]/ = FORWARD
>>>     chain[3]/ = OUTPUT
>>>     chain[4]/ = Mayo-Firewall-INPUT
>>>     append[1]/ = INPUT
>>>     append[2]/ = INPUT
>>>     append[3]/ = INPUT
>>>     append[4]/ = INPUT
>>>     append[5]/ = INPUT
>>>     append[6]/ = INPUT
>>>     append[7]/ = FORWARD
>>>     append[8]/ = Mayo-Firewall-INPUT
>>>     append[9]/ = Mayo-Firewall-INPUT
>>>     append[10]/ = Mayo-Firewall-INPUT
>>>     (...snip...)
>>>     append[27]/ = Mayo-Firewall-INPUT
>>>     append[28]/ = Mayo-Firewall-INPUT
>>>     append[29]/ = Mayo-Firewall-INPUT
>>>
>>>     I'd like to insert a new node immediately before the first
>>>
>>>       append[. = 'Mayo-Firewall-INPUT']
>>>
>>>     node, that is, in this case, before append[8].  However, that position
>>>     in the tree, [8], is obviously not constant.
>>>
>>>     How might I do this?
>>>
>>>     I've tried expressions like this:
>>>
>>>     augtool> insert append before
>>>     "/files/etc/sysconfig/iptables/table/append[. = 'Mayo-Firewall-INPUT']"
>>>     error: Too many matches for path expression
>>>
>>>     and expressions involving [position(...)], like this
>>>
>>>     augtool> insert append before
>>>     "/files/etc/sysconfig/iptables/table/append[position(. =
>>>     'Mayo-Firewall-INPUT')]"
>>>     error: Invalid path expression
>>>
>>>
>>>     which obviously both fail.  Thoughts?
>>>
>>>     Thanks,
>>>     -- Pat
>>>
>>>     _______________________________________________
>>>     augeas-devel mailing list
>>>     augeas-devel at redhat.com <mailto:augeas-devel at redhat.com>
>>>     https://www.redhat.com/mailman/listinfo/augeas-devel
>>>
>>>
>>>
>>>
>>> -- 
>>> Raphaël Pinson
>>> Infrastructure Developer & Trainer
>>> +33 479 26 57 93
>>> +33 781 90 00 79
>>>
>>> Camptocamp France
>>> Savoie Technolac
>>> BP 352
>>> 48, avenue du Lac du Bourget
>>> 73372 Le Bourget du Lac, Cedex
>>> www.camptocamp.com <http://www.camptocamp.com>
>>
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