puppet class dependencies

[David Portabella]

class { c2: }

class { c3: }

class c1 {

}

class c2 {

  class { c1: }

}

class c3 {

  require c2

}

c3 depends on c2 (as expected), but c3 does not depend on c1.

this issue could be fixed by adding "require c1" inside c3.

however, in a general case, I don't know what is instantiated inside c2.

what is the proper way to tell c3 to depend on all classes and resources instantiated inside c2?

[José Luis Ledesma]

Works as expected

You have to use contain if version> 3.4 or anchor pattern
http://docs.puppetlabs.com/puppet/latest/reference/lang_containment.html

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[David Portabella]

I still don't understand much the anchor pattern.

could you please modify the previous example to use the anchor pattern?

[David Portabella]

I've tried the anchor pattern as follows:

class { c2: }

class { c3: }

class c1 {

}

class c2 {

  class { c1: }

  anchor { 'c1_first': } -> Class['c1'] -> anchor { 'c1_last': }

}

class c3 {

  require c2

}

but still puppet apply --graph test.pp shows that c3 does not depend on c1.

so, how to apply the anchor pattern correctly (so that c3 depends on c1)?

[David Portabella]

I've even simplified the example:

class { c2: }

class { c3: }

class c1 {

  notice "+++"

  file {'/tmp/c1.txt': ensure => present }

}

class c2 {

#  include c1

  contain c1

  notice "+++"

  file {'/tmp/c2.txt': ensure => present }

}

class c3 {

  require c2

  notice "+++"

  file {'/tmp/c3.txt': ensure => present }

}

$ puppet apply --graph test.pp

$ open -a GraphViz /Users/david/.puppet/var/state/graphs/relationships.dot 

according to relationships.dot, /tmp/c3.txt does not even depend on /tmp/c2.txt.
why??

(puppet 3.4.3 on OSX 10.9)

[David Portabella]

My colleague Guillaume showed me a possible implementation of the anchor pattern:

class { c2: }

->

class { c3: }

class c1 {

  notice "+++"

  anchor {'before_c1':}

  ->

  file {'/tmp/c1.txt': ensure => present }

  ->

  anchor {'after_c1':}

}

class c2 {

  include c1

  notice "+++"

  anchor {'before_c2':}

  ->

  file {'/tmp/c2.txt': ensure => present }

  ->

  anchor {'after_c2':}

}

class c3 {

  notice "+++"

  anchor {'before_c3':}

  ->

  file {'/tmp/c3.txt': ensure => present }

  ->

  anchor {'after_c3':}

}

Anchor['after_c1'] -> Anchor['before_c2']

Anchor['after_c2'] -> Anchor['before_c3']

$ puppet apply --graph test.pp

$ open -a GraphViz /Users/david/.puppet/var/state/graphs/relationships.dot 

class C3 itself does not depend on class C1,
but all the resource declared in class C3 (in this case, only /tmp/file3.txt) do depend on all the resources declared on class C2 (in this case, only /tmp/file2.txt),
and transitively they depend also on all the resources declared on class C1 (in this case, only /tmp/file1.txt)

[David Portabella]

it seems there is a bug in puppet --graph, that misses some dependencies.

https://tickets.puppetlabs.com/browse/PUP-2075

so, this code actually works as expected:

class { c3: }

class c1 {

  exec { exec1: command => '/bin/echo exec1; exit 1' }

}

class c2 {

  # include c1

  contain c1

  exec { exec2: command => '/bin/echo exec2' }

}

class c3 {

  class { c2: }

  ->

  exec { exec3: command => '/bin/echo exec3; exit 1' }

}

puppet does not execute exec3 because exec1 failed (thanks to replacing include c1 by contain c1).

$ puppet apply test.pp Notice: /Stage[main]/C1/Exec[exec1]/returns: exec1
Error: /bin/echo exec1; exit 1 returned 1 instead of one of [0]
Error: /Stage[main]/C1/Exec[exec1]/returns: change from notrun to 0 failed: /bin/echo exec1; exit 1 returned 1 instead of one of [0]
Notice: /Stage[main]/C2/Exec[exec2]/returns: executed successfully
Notice: /Stage[main]/C3/Exec[exec3]: Dependency Exec[exec1] has failures: true
Warning: /Stage[main]/C3/Exec[exec3]: Skipping because of failed dependencies