Hey Rob,
variable interpolation in strings in ruby is actually done with
#{some_var}, so the following snippet
#!/usr/bin/ruby
"Hello World".match(/Hello (.*)/)
puts $1
puts "$1"
puts "#{$1}
actually returns
World
$1
World
As you can see "$1" does not interpolate to an earlier match.
On 10.01.2017 21:14, Rob Nelson wrote:
> At a guess, dollar signs inside double quotes interpolate, so it's
> extremely possible that somewhere earlier in the ruby run, $3 matched
> "Jan" somewhere and that was reused in your awk command. In the latter
> usage there's probably no $6 (that's a lot of matches!) or it amazingly
> has the value '$6'. I would definitely be more careful about escaping
> any dollars inside of double quoted strings that are passed to exec(),
> system(), or similar functions, as escaping that can be a nightmare when
> the stars align during your design but not weeks later during your usage.
>
> On Tuesday, January 10, 2017 at 12:24:45 PM UTC-5, Denny wrote:
>
> Tried out another customfact "lastyumupdate" which looks like:
>
> |
> Facter.add(:lastyumupdate) do
> setcode do
> Facter::Util::Resolution.exec("yum history |grep -E '^.*(Update|
> U).*$' |head -n 1 |awk '{print $6}'")
> end
> end
> |
>
> This one returns on command line "2017-01-10" AND sets the fact correct
>
> |
> $ puppet facts |grep last
> "lastrebootdate": "Jan",
> "lastyumupdate": "2017-01-10",
> |
>
>
> Any help is appreciated :)
>
>
> Denny
>
> Am Dienstag, 10. Januar 2017 17:47:36 UTC+1 schrieb Denny:
>
> PS: I'm running facter 3.5.0 with puppet 4.8.1 on CentOS 7
>
>
> Am Dienstag, 10. Januar 2017 17:44:23 UTC+1 schrieb Denny:
>
> Hi there,
>
> probably a pretty easy to answer question.
>
> I want to try out adding custom facts. My first custom fact
> should be "lastrebootdate"
>
> My code looks like this:
>
> |
> Facter.add(:lastrebootdate) do
> setcode do
> Facter::Util::Resolution.exec("/usr/bin/who -b |awk
> '{print $3}'")
> end
> end
> |
>
> Running the command on the system returns "2017-01-30"
>
> Deploying my fact on a puppet node and running the puppet
> agent returns "Jan".
>
> |
> $ puppet facts |grep lastrebootdate
> "lastrebootdate": "Jan",
> |
>
> What did I miss?
>
> Thank you,
>
> Denny
>
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