Re: ctime vs checksum in copies

[Marco van Beek]

I have found that using the InsertFile works well for medium size files 
that need a host specific section, but where the majority of the file is 
the same on every host. I even have one config file which is split into 
three sections. The first section is a choice of two files (server or 
workstation, in this case) depending on class, the second section is 
host specific, and picks up host specific variables from a config file, 
and the third section is common to all hosts.

Works really well, so far anyway!

Changes to the insert file are pushed out by having a version number 
appended as the first line, and used by a StartGroup loop with a 
EmptyEntireFilePlease as the first line in the loop.

Regards,

Marco

Ed Brown wrote:
> One more approach, that doesn't require any file copying or tempfile
> storage, is to build the file entirely with cfengine, like this yum.conf
> example, where 3 variables are set depending on network segment, server
> class, and whether it's a 'new build' or not:
>
>   { /etc/yum.conf
>     EmptyEntireFilePlease
>     AppendIfNoSuchLine      "[main]"
>     AppendIfNoSuchLine      "cachedir=/var/cache/yum"
>     AppendIfNoSuchLine      "pkgpolicy=newest"
>     AppendIfNoSuchLine      "tolerant=1"
>     AppendIfNoSuchLine      "exactarch=1"
>     AppendIfNoSuchLine      "retries=3"
>     AppendIfNoSuchLine      "exclude=${YumExcludes}"
>     AppendIfNoSuchLine      "${LogString}"
>     AppendIfNoSuchLine      "[base]"
>     AppendIfNoSuchLine      "name=${packageserver} common rpm
> repository"
>     AppendIfNoSuchLine      "baseurl=ftp://${packageserver}";
>     AutoCreate
>  }
>
> As with some of the other examples, cfengine doesn't actually rewrite
> the file unless it's necessary.  This is well-suited for short files,
> would be a little bit of a pain to generate long files this way.
>
> -Ed
>
>
>
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