On Friday, May 8, 2015 at 10:42:03 AM UTC-5, James Oden wrote:
>
> I created a custom fact file to generate home_$user entries for all
> users on the system containing their respective home directories:
>
> require 'etc'
>
> while pwEnt = Etc.getpwent do
> name = pwEnt.name
> home = pwEnt.dir
> var = "home_#{name}"
> Facter.add(var) do
> setcode do
> home
> end
> end
> end
> Etc.endpwent
>
> When I use it though every home_$user entry has the same value (the
> home directory of the last user it processed). I can add print
> statements and see that the loop is getting the right information.
> What am I doing wrong or not understanding?
>
>
I think you're probably being tripped up by the fact that the setcode block
is a closure. As the name suggests, it is a block of *code* that is
executed later, separately from the block that declares it. But each of
your facts's setcode blocks encloses a reference to *the same* home
variable of the enclosing block, whose value you change at every iteration
of the loop. Thus all the facts present the same value: whichever should
correspond to the last pwent considered.
The Facter API is designed around the idea that each fact will evaluate its
value upon request. Pre-defining specific facts to have specific values
can be made to work, and it should then do what you expect for a run of
standalone Facter, but it may surprise you in other contexts. For example,
if a long-running process -- say the agent running as a daemon -- loads
Facter into itself, then all those facts are defined at that point. If the
plugin code does not change (thereby triggering the process to reload
them), then the facts themselves will not change either, notwithstanding
any changes to the underlying system.
The most natural way to approach the problem would be to define a single
custom, structured fact whose value is a hash mapping user names to home
directories. That might look something like this:
require 'etc'
Facter.add('homeDirs') do
setcode do
homeDirs = {}
Etc.passwd { |pwEnt| homeDirs[pwEnt.name] = pwEnt.dir }
homeDirs
end
end
Structured facts require Facter 2.0 or above, and Puppet (< 4.0) must be
configured to not stringify facts.
John
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