FAQ
This works when using the variable inside a template.

But I want to use the variable in an Exec command. How to remove the
newline here? .chomp does not seem to work here.

THanks
On Sunday, December 26, 2010 1:43:26 PM UTC+1, bowlby wrote:

Thanks, both of you! That solved it.

Merry Christmas (for what's left of it...)


On Dec 26, 12:54 pm, Daniel Pittman wrote:
On Sun, Dec 26, 2010 at 22:45, bowlby wrote:
I have this in nodes.pp
$puppetmaster_fqdn = generate("/usr/bin/facter","fqdn")
and this in a template
http://<%= puppetmaster_fqdn %>:8080
When puppet runs, this is the result:
http://puppet.home
:8080
Anybody any clue to whats causing this? I've tried -%>
I suspect that -%> only eats whitespace outside the bracket, not
inside. Anyhow, you can make this do the right thing using a tiny bit
of ruby: <%= puppetmaster_fqdn.chomp %>

Regards,
Daniel
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  • Jcbollinger at Dec 14, 2012 at 2:17 pm

    On Thursday, December 13, 2012 9:48:44 AM UTC-6, Sven vd wrote:
    This works when using the variable inside a template.

    But I want to use the variable in an Exec command. How to remove the
    newline here? .chomp does not seem to work here.

    No, it wouldn't. The 'chomp' is a method of Ruby's String class. It works
    in the embedded Ruby context in a template, but it is not part of the
    Puppet DSL, so it does not work for ordinary variable interpolation.

    The underlying problem is that the generate() command you are using is
    outputting a trailing newline that gets incorporated into the resulting
    value. That's not too surprising, as it is good form for programs (such as
    whatever external command you are running) to terminate their output with a
    newline.

    You have two main options:

    1. Modify the command in some way or filter its output to remove the
    newline before it reaches Puppet
    2. Remove the newline inside Puppet

    I leave you to figure out (1) on your own. You have multiple approaches
    available for (2). The easiest built into Puppet is to use a template,
    probably via the inline_template() function:

    $result_line = generate('my command')
    $result = inline_template('<%= @result_line.chomp %>')

    That's a little ugly, though. If you have or are willing to install
    Puppetlabs' "stdlib" add-on module, then it provides a chomp() function in
    Puppet. With that, you could replace the second line above with:

    $result = chomp($result_line)

    Note well that Puppet variables can only be assigned values once each.
    That's why my examples use two variables ($result_line and $result).


    John

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  • Sven vd at Dec 14, 2012 at 5:13 pm
    Thanks for your complete answer! I used the inline_template method which is
    good enough for me
    On Friday, December 14, 2012 3:17:24 PM UTC+1, jcbollinger wrote:


    On Thursday, December 13, 2012 9:48:44 AM UTC-6, Sven vd wrote:

    This works when using the variable inside a template.

    But I want to use the variable in an Exec command. How to remove the
    newline here? .chomp does not seem to work here.

    No, it wouldn't. The 'chomp' is a method of Ruby's String class. It
    works in the embedded Ruby context in a template, but it is not part of the
    Puppet DSL, so it does not work for ordinary variable interpolation.

    The underlying problem is that the generate() command you are using is
    outputting a trailing newline that gets incorporated into the resulting
    value. That's not too surprising, as it is good form for programs (such as
    whatever external command you are running) to terminate their output with a
    newline.

    You have two main options:

    1. Modify the command in some way or filter its output to remove the
    newline before it reaches Puppet
    2. Remove the newline inside Puppet

    I leave you to figure out (1) on your own. You have multiple approaches
    available for (2). The easiest built into Puppet is to use a template,
    probably via the inline_template() function:

    $result_line = generate('my command')
    $result = inline_template('<%= @result_line.chomp %>')

    That's a little ugly, though. If you have or are willing to install
    Puppetlabs' "stdlib" add-on module, then it provides a chomp() function in
    Puppet. With that, you could replace the second line above with:

    $result = chomp($result_line)

    Note well that Puppet variables can only be assigned values once each.
    That's why my examples use two variables ($result_line and $result).


    John
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    You received this message because you are subscribed to the Google Groups "Puppet Users" group.
    To view this discussion on the web visit https://groups.google.com/d/msg/puppet-users/-/bsVEopGUj2QJ.
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