[augeas-devel] How to insert empty nodes in Augeas trees?

[Mol, Xavier (SCC)]

Hi Raphael, all,

 

some more finding about this…

 

Neither 'touch', nor 'rename' can be used during a put unit test. Also, relying on Augeas users to do this just to insert a line break, which is required for a valid configuration file, is ugly and error prone. This workaround still may be used to add additional empty lines to a configuration file just to improve readability (where they don't break anything), so still a useful lesson. Though for my custom lens, I have decided to look for and create empty lines by default, as with any string literal. This way, the Augeas tree doesn't need to feature empty nodes and empty lines will be added in put direction automatically.

 

Thank you again for your time,

Xavier.

 

From: augeas-devel-bounces at redhat.com [mailto:augeas-devel-bounces at redhat.com] On Behalf Of Mol, Xavier (SCC)
Sent: Tuesday, December 22, 2015 10:27 AM
To: Raphaël Pinson
Cc: augeas-devel at redhat.com
Subject: Re: [augeas-devel] How to insert empty nodes in Augeas trees?

 

Hi Raphael,

 

thank you again for your quick and helpful reply!

 

Ciao,

Xavier.

 

From: Raphaël Pinson [mailto:raphael.pinson at camptocamp.com] 
Sent: Tuesday, December 22, 2015 10:25 AM
To: Mol, Xavier (SCC)
Cc: augeas-devel at redhat.com
Subject: Re: [augeas-devel] How to insert empty nodes in Augeas trees?

 

Hello Xavier,

 

 

I was going to say that was not possible, but I actually (to my great surprise) found a way to do it:

 

    augtool> touch /files/etc/fstab/01

    augtool> rename /files/etc/fstab/01 ""

    rename : /files/etc/fstab/01 to  1

    augtool> save

    Saved 1 file(s)

 

Just added an empty line at the end of /etc/fstab

 

 

Cheers,

 

Raphaël

 

 

 

On Tue, Dec 22, 2015 at 10:06 AM, Mol, Xavier (SCC) <xavier.mol at kit.edu> wrote:

Hello Augeas experts,

is there a way to insert empty nodes in an Augeas tree? I've made a lens, that expects an empty line as last part (Util.empty), which works fine with existing files. However, when inserting a new node in the tree with that lens, the closing empty line is missing. Do I need to have a labelled node in the tree without value or children, that simply puts an empty line in the resulting string instead?

Thank you for your time,
Xavier.

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