manifests/upgrade_package.pp


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# Install a package either to a certain version, or while making sure that it's
# always the latest version that's installed.

define apt::upgrade_package (
  $version = '',
) {

  $version_suffix = $version ? {
    ''       => '',
    'latest' => '',
    default  => "=${version}",
  }

  if !defined(Package['apt-show-versions']) {
    package { 'apt-show-versions':
      ensure  => installed,
    }
  }

  if !defined(Package['dctrl-tools']) {
    package { 'dctrl-tools':
      ensure  => installed,
    }
  }

  exec { "apt-get -q -y -o 'DPkg::Options::=--force-confold' install ${name}${version_suffix}":
    onlyif  => [ "grep-status -F Status installed -a -P ${name} -q", "apt-show-versions -u ${name} | grep -q upgradeable" ],
    require => Package['apt-show-versions', 'dctrl-tools'],
    before  => Exec['apt_updated']
  }
}