Puppet users - Mar 2009 - Visualizing puppet circular dependencies

I recently got a scary-looking circular dependency as a puppet error,
and it took some thought to decipher it.

Long story short, I fed it to graphviz, and the graph made it obvious
where the problem was.  Thought I''d share, in case others are having
the same trouble.  Code''s at http://gist.github.com/74566, and also
pasted below for convenience.

-- Philip

# Make sense of puppet circular dependency error messages.
# Tags: graphviz, puppet
# See output at http://i41.tinypic.com/b6yeqv.jpg

$ cat circular.pp
node default {
  exec { "/a": require => Exec["/b"] }
  exec { "/b": require => Exec["/c"] }
  exec { "/c": require => Exec["/a"] }
}
$ puppet --color=false circular.pp \
   | grep "the following relationships: " \
   | awk -F"the following relationships: " ''{ print $2
}'' \
   | tr , \\n \
   | (echo "digraph {"; perl -pi -e''s/^\s*(\S.*\S) =>
(\S.*\S)\s*$/
"$1" -> "$2";\n/''; echo "}") \
   | dot -Tpdf > circular.pdf

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Philip Zeyliger wrote:
> I recently got a scary-looking circular dependency as a puppet error,
> and it took some thought to decipher it.
> 
> Long story short, I fed it to graphviz, and the graph made it obvious
> where the problem was.  Thought I''d share, in case others are
having
> the same trouble.  Code''s at http://gist.github.com/74566, and
also
> pasted below for convenience.
This would look great added to the puppet wiki =)

-- 
Frank Sweetser fs at wpi.edu  |  For every problem, there is a solution that
WPI Senior Network Engineer   |  is simple, elegant, and wrong. - HL Mencken
     GPG fingerprint = 6174 1257 129E 0D21 D8D4  E8A3 8E39 29E3 E2E8 8CEC

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On 5/03/09 22:56, Frank Sweetser wrote:
> Philip Zeyliger wrote:
>> I recently got a scary-looking circular dependency as a puppet error,
>> and it took some thought to decipher it.
>>
>> Long story short, I fed it to graphviz, and the graph made it obvious
>> where the problem was.  Thought I''d share, in case others are
having
>> the same trouble.  Code''s at http://gist.github.com/74566, and
also
>> pasted below for convenience.
> 
> This would look great added to the puppet wiki =)
And I''d say the ext/ directory of the puppet distribution.
-- 
Brice Figureau
Days of Wonder
http://www.daysofwonder.com

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