[augeas-devel] Re: [Augeas] #23: Incorrect value returned by aug_get

[Augeas]

#23: Incorrect value returned by aug_get
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  Reporter:  lutter  |       Owner:  lutter
      Type:  defect  |      Status:  new   
  Priority:  major   |   Milestone:  next  
 Component:  Augeas  |     Version:  0.3.1 
Resolution:          |    Keywords:        
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Comment (by ddumont):

 Hello

 In fact, a similar issue (but not exactly the same) arise also for lenses
 like sshd !HostKey. To add a new element to !HostKey, the user must know
 that /files/etc/ssh/sshd_config/HostKey![4] is correct, but
 /files/etc/ssh/sshd_config/HostKey/4 is not.

 Likewise, the issue arise for hash like lenses like sshd Subsystem. To add
 a new subsystem the user must enter something like
 /files/etc/ssh/sshd_config/Subsystem![4]/bazftp.
 /files/etc/ssh/sshd_config/Subsystem/bazftp will not be accepted.

 To make matter more confusing for the user, to remove a subsystem, one
 must remove the correct node. I.e.
 aug_rm(/files/etc/ssh/sshd_config/Subsystem![4]/bazftp) will fail when
 saving the file. The user must do
 aug_rm(/files/etc/ssh/sshd_config/Subsystem![4]) to be able to save the
 modified file.

 I've detailed all these issues in the documentation of the "bridge"
 between Augeas and Config::Model in [http://config-
 model.svn.sourceforge.net/viewvc/config-model/trunk/config-model-backend-
 augeas/lib/Config/Model/Backend/Augeas.pm?revision=812&view=markup
 "bridge" source] (at line 106). I'll give a URL to formatted doc once
 Config::Model::Backend::Augeas is released in CPAN.

 For what it's worth, I've implemented a way to work around the issue
 mentioned above so that the end user does not have to worry about whether
 a lenses needs an index between square brackets or not. Removal of nodes
 is also taken care of. This work-around relies on the specification of
 what I called "sequential lens" (see doc above). You can probably re-use
 some of the ideas of this work-around.

 Feel free to come back to me if you need more explanations.

 All the best

-- 
Ticket URL: <https://fedorahosted.org/augeas/ticket/23#comment:1>
Augeas <http://augeas.net/>
a configuration API