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

[Mol, Xavier (SCC)]

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.


****
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Steinbuch Centre for Computing (SCC)

B. Sc. Xavier Mol
GridKa Storage Administrator and Support Manager

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Phone: +49 721 608 23041
Email: xavier.mol at kit.edu
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