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Re: edit and copy


From: Mark . Burgess
Subject: Re: edit and copy
Date: Sat, 29 May 2004 08:42:05 +0200 (MEST)

A "method" could be a god way of solving this problem, i.e.
a cfengine "subroutine".

M

On 28 May, Kai Grossjohann wrote:
> Steve Wray <address@hidden> writes:
> 
>> Ideally, the repository would contain such files (eg /etc/hosts) and 
>> these would go into the working copy on the workstation and cfengine 
>> would copy these into the live /etc directory (or wherever) modifying 
>> them on the way; I don't want the files in the local svn working copy 
>> to be modified and I don't want the unaltered files going into the 
>> live /etc and then being modified, rather the files should be modified 
>> in transit.
> 
> There is no cfengine functionality I know of to modify files in
> transit.  AFAIK, there is only copying without modification, and then
> there is editing without copying.
> 
> One possibility would be to introduce another layer of files: First
> you update the svn working copy.  Then you copy the file from there to
> /etc/hosts.in (say).  Then you edit that file.  Then you copy
> /etc/hosts.in to /etc/hosts.
> 
> But this means that cfengine does all the work every time.  So you
> would have to skip the later steps unless the svn working copy has
> changed.
> 
> Hm.  Hmmm....  Ah!  Here is another idea: use templates together with
> the editfiles directive.  Let's say the svn working copy of the file
> is /etc/cfengine/svn/hosts.  Now you create an editfiles directive
> which edits the file /etc/hosts.  The edit commands are as follows:
> 
>   - Empty the entire file.
>   - Insert the contents of /etc/cfengine/svn/hosts.
>   - Replace the placeholders with the real values.
> 
> If cfengine can detect that the above steps left the file unchanged,
> then it won't save the file.  But if it has changed, it will save the
> new file.  And you never have the placeholders on disk.
> 
> Kai
> 
> 
> 
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