[Puppet Users] Re: variables created with generate() function have a newline when used in a template
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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[Puppet Users] Re: variables created with generate() function have a newline when used in a template
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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[Puppet Users] Re: variables created with generate() function have a newline when used in a template
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
> > --
> > ✣ Daniel Pittman✉ dan...@rimspace.net☎ +61 401
> 155 707
> > ♽ made with 100 percent post-consumer electrons
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[Puppet Users] Re: variables created with generate() function have a newline when used in a template
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
> --
> ✣ Daniel Pittman ✉ dan...@rimspace.net ☎ +61 401 155 707
> ♽ made with 100 percent post-consumer electrons
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