[augeas-devel] Why does Augeas fail to create new files?

[Mol, Xavier (SCC)]

> ---> Creating an empty node works fine, though this should actually fail in my opinion (an empty file is invalid according to the lens).
Sorry, I have to correct this. The attached lens definition does allow for an empty file. However, setting lns like this:

let lns = ( empty | comment )* . version . ( empty | comment | rule )*

Hence, requiring at least a line with "version" in it, doesn't change the reported behaviour at all for me.

Ciao,
Xavier.

> -----Original Message-----
> From: augeas-devel-bounces at redhat.com [mailto:augeas-devel-bounces at redhat.com] On Behalf Of Mol, Xavier (SCC)
> Sent: Thursday, December 17, 2015 1:33 PM
> To: augeas-devel at redhat.com
> Subject: [augeas-devel] Why does Augeas fail to create new files?
> 
> Hello Augeas experts,
> 
> attached you can find the source of a custom lens for Augeas and a file with get and put unit tests; either file is evaluated with augparse
> successfully. My question is, why can I not create a new file from scratch with that lens, while editing existing files works just fine?
> 
> In order to test the steps in between, I used augeas-1.4 and augtool:
> 
> [root ~]# augtool --version
> augtool 1.4.0 <http://augeas.net/>
> Copyright (C) 2007-2011 David Lutterkort
> License LGPLv2+: GNU LGPL version 2.1 or later
>                  <http://www.gnu.org/licenses/lgpl-2.1.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> 
> Written by David Lutterkort
> 
> [root ~]# augtool
> augtool> print /augeas/load/StorageAuthzdb/*[label() != "excl"]
> /augeas/load/StorageAuthzdb/lens = "@StorageAuthzdb"
> /augeas/load/StorageAuthzdb/incl = "/etc/grid-security/storage-authzdb"
> 
> ---> Currently, the node included with that lens doesn't exist.
> augtool> ls /files/etc/grid-security/storage-authzdb
> augtool> dump-xml /files/etc/grid-security/storage-authzdb
> <augeas match="/files/etc/grid-security/storage-authzdb"/>
> 
> ---> Creating an empty node works fine, though this should actually fail in my opinion (an empty file is invalid according to the lens).
> augtool> touch /files/etc/grid-security/storage-authzdb
> augtool> save
> Saved 1 file(s)
> augtool> ls /files/etc/grid-security
> storage-authzdb = (none)
> augtool> dump-xml /files/etc/grid-security/storage-authzdb
> <augeas match="/files/etc/grid-security/storage-authzdb">
>   <node label="storage-authzdb" path="/files/etc/grid-security/storage-authzdb"/>
> </augeas>
> 
> ---> Saving the minimal change required for a valid storage-authzdb file fails.
> augtool> set /files/etc/grid-security/storage-authzdb/version "2.1"
> augtool> dump-xml /files/etc/grid-security/storage-authzdb
> <augeas match="/files/etc/grid-security/storage-authzdb">
>   <node label="storage-authzdb" path="/files/etc/grid-security/storage-authzdb">
>     <node label="version">
>       <value>2.1</value>
>     </node>
>   </node>
> </augeas>
> augtool> save
> error: Failed to execute command
> saving failed (run 'errors' for details)
> augtool> errors
> Error in /etc/grid-security/storage-authzdb:1.0 (parse_skel_failed)
>   parse can not process entire input
>   Lens: /usr/share/augeas/lenses/storageauthzdb.aug:34.12-.75:
> 
> 
> ---> Starting over...
> [root ~]# rm /etc/grid-security/storage-authzdb
> rm: remove regular empty file `/etc/grid-security/storage-authzdb'? y
> [root ~]# augtool
> 
> ---> Create the desired tree
> augtool> set /files/etc/grid-security/storage-authzdb/version "2.1"
> 
> ---> Review what the lens would put as a string, which matches what I expect.
> augtool> set /in ""
> augtool> retrieve StorageAuthzdb.lns /in /files/etc/grid-security/storage-authzdb /out
> augtool> print /out
> /out = "version 2.1\n"
> 
> ---> Still saving that output fails
> augtool> save
> error: Failed to execute command
> saving failed (run 'errors' for details)
> augtool> errors
> Error in /etc/grid-security/storage-authzdb:1.0 (parse_skel_failed)
>   parse can not process entire input
>   Lens: /usr/share/augeas/lenses/storageauthzdb.aug:34.12-.75:
> 
> ---> Though when the file exists before augtool is used, everything seems to work.
> [root ~]# echo version 2.1 >/etc/grid-security/storage-authzdb
> [root ~]# augtool
> augtool> ls /files/etc/grid-security/storage-authzdb
> version = 2.1
> augtool> dump-xml /files/etc/grid-security/storage-authzdb
> <augeas match="/files/etc/grid-security/storage-authzdb">
>   <node label="storage-authzdb" path="/files/etc/grid-security/storage-authzdb">
>     <node label="version">
>       <value>2.1</value>
>     </node>
>   </node>
> </augeas>
> augtool> set /files/etc/grid-security/storage-authzdb/version "2.2"
> augtool> save
> Saved 1 file(s)
> [root ~]# cat /etc/grid-security/storage-authzdb
> version 2.2
> 
> 
> 
> What am I doing wrong here?
> 
> Thank you for your time,
> Xavier.
> 
> 
> ****
> Karlsruher Institute of Technology (KIT)
> Steinbuch Centre for Computing (SCC)
> 
> B. Sc. Xavier Mol
> GridKa Storage Administrator and Support Manager
> 
> Hermann-von-Helmholtz-Platz 1
> Geb. 449
> 76344 Eggenstein-Leopoldshafen
> Phone: +49 721 608 23041
> Email: xavier.mol at kit.edu
> www.kit.edu
> KIT - University of the State of Baden-Württemberg and National Large-scale Research Center of the Helmholtz Association
> "Since 2010, the KIT has been certified as a family-friendly university."
> ****

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