Puppet users - May 2009 - variable scope with define and friends...

Hi,

in this simplified example, I''m trying to create directories, and add
each directory name into a variable,
later on, generate a file which its content should be the directory
names, but it doesn''t work....

any help appreciated.

Thanks,
Ohad


node default {
include b
}

class a {
file{"/tmp/dirs": content => template("/tmp/dirs.erb")}
}

class b {
$dirs = ["dummy"]
dir{["/tmp","/tmp/a","/tmp/b"]:}
include a
}

define dir() {
file {$name: ensure => directory }
$b::dirs += $name
}

-----
/tmp/dirs.erb:
<%= scope.lookupvar("b::dirs") %>

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I might be wrong Ohad but my understanding is that puppet configurations are
declarative and therefore have to be compiled. It probably helps to stop
thinking about your define as being a function, executed at run time, and
think of it as a macro that is substitued all over the place. It is not a
function being run.

You could write a custom function for this but I think the easiest is if you
simply do

$dirs =["/tmp","/tmp/a","/tmp/b"]

dir { $dirs: }

then it will be available to your template. I haven''t tried this though
it
may not work.

Joel

On Fri, May 29, 2009 at 3:55 PM, Ohad Levy <ohadlevy@gmail.com> wrote:
> Hi,
>
> in this simplified example, I''m trying to create directories, and
add each directory name into a variable,
> later on, generate a file which its content should be the directory names,
but it doesn''t work....
>
> any help appreciated.
>
> Thanks,
> Ohad
>
>
> node default {
> include b
> }
>
> class a {
> file{"/tmp/dirs": content =>
template("/tmp/dirs.erb")}
> }
>
> class b {
> $dirs = ["dummy"]
> dir{["/tmp","/tmp/a","/tmp/b"]:}
> include a
> }
>
> define dir() {
> file {$name: ensure => directory }
> $b::dirs += $name
> }
>
> -----
> /tmp/dirs.erb:
> <%= scope.lookupvar("b::dirs") %>
>
>
> >
>
--~--~---------~--~----~------------~-------~--~----~
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On Fri, May 29, 2009 at 2:26 PM, Joel Heenan <joelh@planetjoel.com> wrote:
> I might be wrong Ohad but my understanding is that puppet configurations
> are declarative and therefore have to be compiled. It probably helps to
stop
> thinking about your define as being a function, executed at run time, and
> think of it as a macro that is substitued all over the place. It is not a
> function being run.
>
I guess the function in this case is the template / notice or what ever
you''ll replace it with...

>
> You could write a custom function for this but I think the easiest is if
> you simply do
that wont help either, because you cant control when the function would run,
same as templates.
Unless I''ll write a function which reads the manifests file again. :(

>
>
> $dirs =["/tmp","/tmp/a","/tmp/b"]
>
> dir { $dirs: }
my example was a simple one, the real usage case wont work with this
workaround as I cant define them in one place
>
>
> then it will be available to your template. I haven''t tried this
though it
> may not work.
>
> Joel
>
>
> On Fri, May 29, 2009 at 3:55 PM, Ohad Levy <ohadlevy@gmail.com>
wrote:
>
>> Hi,
>>
>> in this simplified example, I''m trying to create directories,
and add each directory name into a variable,
>>
>> later on, generate a file which its content should be the directory
names, but it doesn''t work....
>>
>> any help appreciated.
>>
>> Thanks,
>> Ohad
>>
>>
>> node default {
>> include b
>> }
>>
>> class a {
>> file{"/tmp/dirs": content =>
template("/tmp/dirs.erb")}
>> }
>>
>> class b {
>> $dirs = ["dummy"]
>> dir{["/tmp","/tmp/a","/tmp/b"]:}
>> include a
>> }
>>
>> define dir() {
>> file {$name: ensure => directory }
>> $b::dirs += $name
>> }
>>
>> -----
>> /tmp/dirs.erb:
>> <%= scope.lookupvar("b::dirs") %>
>>
>>
>>
>>
>
> >
>
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replying to myself...

so it seems the problem is not the varialbe scope, rather then the template
function.
the following code works:

node default {
    include a
    include b
}

class a {
    $dirs = ""
    dir{["/tmp","/tmp/a","/tmp/b"]: before =>
File["/tmp/dirs"]}
}
class b {
    file{"/tmp/dirs": content => $a::dirs}
    #file{"/tmp/dirs": content =>
template("/tmp/dirs.erb")}
}

define dir() {
    $a::dirs += " $name"
    file {$name: ensure => directory }
}


if anyone has any idea how to make this work with a template, that would be
great.

Thanks,
Ohad

On Fri, May 29, 2009 at 1:55 PM, Ohad Levy <ohadlevy@gmail.com> wrote:
> Hi,
>
> in this simplified example, I''m trying to create directories, and
add each directory name into a variable,
> later on, generate a file which its content should be the directory names,
but it doesn''t work....
>
> any help appreciated.
>
> Thanks,
> Ohad
>
>
> node default {
> include b
> }
>
> class a {
> file{"/tmp/dirs": content =>
template("/tmp/dirs.erb")}
> }
>
> class b {
> $dirs = ["dummy"]
> dir{["/tmp","/tmp/a","/tmp/b"]:}
> include a
> }
>
> define dir() {
> file {$name: ensure => directory }
> $b::dirs += $name
> }
>
> -----
> /tmp/dirs.erb:
> <%= scope.lookupvar("b::dirs") %>
>
>
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