chaining.pp

  exec { 'first':
    command => '/usr/bin/true',
    unless  => '/bin/test -f ./mark.txt'
  }
  
  exec { 'second':
    command => '/usr/bin/false',
    subscribe => Exec['first'],
    refreshonly => true
  }

  exec { 'third':
    command => '/usr/bin/true',
    subscribe => Exec['second'],
    refreshonly => true
  }
  
  file { 'mark':
    path => '/Users/eric/mark.txt',
    content => 'success',
    subscribe => Exec['third'],
  }

output.txt

 > puppet --debug chaining.pp
debug: Creating default schedules
debug: Failed to load library 'ldap' for feature 'ldap'
debug: Failed to load library 'shadow' for feature 'libshadow'
debug: Finishing transaction 2174832960 with 0 changes
debug: //Exec[second]/subscribe: subscribes to Exec[first]
debug: //Exec[third]/subscribe: subscribes to Exec[second]
debug: //File[mark]/subscribe: subscribes to Exec[third]
debug: //Exec[first]: Executing check '/bin/test -f ./mark.txt'
debug: Executing '/bin/test -f ./mark.txt'
debug: //Exec[first]: Changing returns
debug: //Exec[first]: 1 change(s)
debug: //Exec[first]: Executing '/usr/bin/true'
debug: Executing '/usr/bin/true'
notice: //Exec[first]/returns: executed successfully
info: //Exec[first]: Scheduling refresh of Exec[second]
notice: //Exec[second]: Triggering 'refresh' from 1 dependencies
debug: //Exec[second]: Executing '/usr/bin/false'
debug: Executing '/usr/bin/false'
err: //Exec[second]: Failed to call refresh on Exec[second]: /usr/bin/false returned 1 instead of 0 at /Users/eric/chaining.pp:10
info: //Exec[second]: Scheduling refresh of Exec[third]
notice: //Exec[third]: Triggering 'refresh' from 1 dependencies
debug: //Exec[third]: Executing '/usr/bin/true'
debug: Executing '/usr/bin/true'
debug: //File[mark]: File does not exist
debug: //File[mark]/checksum: Initializing checksum hash
debug: //File[mark]: Changing content
debug: //File[mark]: 1 change(s)
debug: //File[mark]: Creating checksum {md5}260ca9dd8a4577fc00b7bd5810298076
notice: //File[mark]/content: defined 'content' as '{md5}260ca9dd8a4577fc00b7bd5810298076'
debug: Finishing transaction 2175655800 with 2 changes