在文件，类和定义之间创建关系的人偶

Question

I want to create relationship between file, class and define.... Please check the below code.... The problem I am facing is, even if there is no change in deploy.cfg file, class and nexus::artifact always runs...

class and nexus::artifact should execute only if it detects a change in file

I know that we need to make use of subscribe and refreshonly=true. But I have no idea where to put this...

 file { 'deploy.cfg':
    ensure  => file,
    path    => '/home/deploy/deploy.cfg',
    mode    => '0644',
    owner   => 'root',
    group   => 'root',
    content => "test",
    notify  => [Class['nexus'], Nexus::Artifact['nexus-artifact']],
    subscribe => File['/home/deploy/dir'],
  }

  class { 'nexus':
    url      => $url,
    username => $user,
    password => $password,
  }

  nexus::artifact { "nexus-artifact":
    gav        => $gav,
    packaging  => $packaging,
    output     => $targetfilepath,
    repository => $repository,
    owner      => $owner,
    mode       => $mode,
  }

artifact.pp

define nexus::artifact (
  $gav,
  $repository,
  $output,
  $packaging  = 'jar',
  $classifier = undef,
  $ensure     = update,
  $timeout    = undef,
  $owner      = undef,
  $group      = undef,
  $mode       = undef
) {
    include nexus
}

init.pp

class nexus (
  $url,
  $username = undef,
  $password = undef,
  $netrc = undef,
) {
}

Answer 1

even if there is no change in deploy.cfg file, class and nexus::artifact always runs

Well yes, every class and resource in your node's catalog is applied on every catalog run, unless a resource that is required to be applied before it fails. That is normal. The key thing to understand in this regard is that the first part of applying a catalog resource is determining whether the corresponding physical resource is already in sync; if it is, then applying the catalog resource has no further effect.

class and nexus::artifact should execute only if it detects a change in file

I know that we need to make use of subscribe and refreshonly=true.

Well, no. You may be able to modulate the effect of applying that class and resource, but you cannot use the result of syncing another resource to modulate whether they are applied at all. In any event, refreshonly is specific to Exec resources, and you don't have any of those in your code.