仅当另一个 Exec 运行时才运行 Exec [英] run Exec only if another Exec ran

问题描述

如何将 Exec 配置为仅在另一个 Exec 运行时运行?

how can I configure a Exec to run only if another Exec ran?

我有一个这样的清单:

file { $target:
    ensure => directory
}

exec { "unzip foobar.zip -C ${target}": 
    unless => "file ${target}/some-file-form-archive"
}

exec { "chown -R $user ${target}":
    onlyif => ???
}

我希望 chown 仅在 unzip foobar.zip 运行时运行.当然，我可以开始检查 some-file-from-archive 是否已经归 $user 所有，但不知何故似乎不对.

I would like the chown to run only if unzip foobar.zip ran. Of course I could start checking whether some-file-from-archive is already owned by $user, but somehow it does not seem right.

推荐答案

这里已经有了答案:http://ask.puppetlabs.com/question/14726/run-exec-only-if-another-exec-ran/

像这样更改清单可以解决我的问题:

Changing the manifest like this fixes my problem:

exec { 'unpack file':
  command => "unzip foobar.zip -C ${target}",
  path        => '/usr/bin',
  creates    => "${target}/some-file-form-archive",
  require    => File[$target, '<archive>'],
  notify      => Exec[fix archive],
}

exec { 'fix archive':
  command => "chown -R ${user} ${target}",
  path => '/bin',
  refreshonly => true,
}

更新 28.11.2014

受到 Felix Frank 的评论的启发，我试过了出别的东西.您可以确保文件树中的所有资源都由这样的用户拥有，而不是通知/刷新:

motivated by Felix Frank's comment i tried out something else. instead of notify/refreshonly you can ensure all resource in a file-tree are owned by a user like this:

exec { 'fix archive':
  command => "chown -R ${user} ${target}",
  path => '/bin',
  unless => "test 0 -eq $(find ${target} \\! -user ${user} | wc -l)"
}

这种方式确保所有者是 $user，即使它在 unpack file 运行后被更改.

this way owner is ensured to be $user even if it was changed after unpack file ran.

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