How to convert a string to integer in Puppet?

Question

I want to check whether the content of a variable is an odd number. But I need an integer for it.

$ip_array = split($ipaddress, '.')
$odd_ip = $ip_array[3] % 2

if $odd_ip == 1 {
  notice("is odd")
}

Is there an easy way to convert a string to integer?

score 5 · Answer 1 · answered Jun 05 '12 at 15:21

5

You can do this:

$n_timeout = 0 + $timeout

answered Jun 05 '12 at 15:21

Barry

This breaks with stings with leading zeros, e.g. "04" – Gary van der Merwe Apr 06 '16 at 07:17
With puppet 4 this will cause a warning: Warning: The string '1' was automatically coerced to the numerical value 1 at ... – Slaven Rezic Nov 20 '18 at 12:46
Puppet documentation suggests this, and offers a scanf method to handle extraction versus peer coercion. https://puppet.com/docs/puppet/latest/lang_data_number.html#reference-5590 – cgseller Nov 22 '19 at 14:38

score 3 · Answer 2 · answered Oct 12 '15 at 09:45

3

I've taken to using the scanf function in stdlib.

An example of this:

$ram = scanf("${::memorysize_mb}", "%i")

This requires puppet >= 3.7.5

answered Oct 12 '15 at 09:45

Andrew

1

Note that this will return an array, where the first element is the wished value. In puppet 4 it is possible to write something like scanf(...)[0], in puppet 3 it seems to be required to split this in two statements: first assign to an array variable, then get the first element. – Slaven Rezic Nov 20 '18 at 12:53
This is acceptable too based on puppet documentation https://puppet.com/docs/puppet/latest/lang_data_number.html#reference-5590. Both the @barry above and answers here are allowed by puppetlabs. – cgseller Nov 22 '19 at 14:39

score 1 · Answer 3 · answered May 14 '12 at 16:33

1

Your code will work exactly as defined; Puppet implicitly converts strings and integers as appropriate for the comparison operator being used.

answered May 14 '12 at 16:33

Daniel Pittman

I got the following error: Could not match % at /etc/puppet/modules/my/manifests/target.pp:23 on node mynode.domain.de – MMore May 14 '12 at 17:16
If I replace '%' with '*' (testing) -> left operand of * is not a number at /etc/puppet/modules/my/manifests/target.pp:25 on node mynode.domain.de – MMore May 14 '12 at 17:20
1

Ah. You have found a genuine bug in Puppet. You should file a ticket at projects.puppetlabs.com/projects/puppet/issues/new so that we can fix it. – Daniel Pittman May 14 '12 at 18:15
2

Puppet doesn't do that when the value comes from hiera. You get a "Error 400 on SERVER: comparison of Fixnum with String failed" error. – Rob Feb 14 '14 at 15:42

score 1 · Answer 4 · answered Sep 10 '19 at 12:46

1

Puppet 4: $odd_ip = Integer($ip_array[3]) % 2

answered Sep 10 '19 at 12:46

jonhattan

4 Answers4