使用 jmespath 连接复杂数据结构中的多个数组

Question

我正在尝试将复杂数据结构中描述的 NFS 导出 转换为 nfs-server 守护进程接受的配置选项，该选项稍后将在 ansible 中使用。 p>

我有：

    nfs_exports:
    - path: /export/home
      state: present
      options:
      - clients: "192.168.0.0/24"
        permissions:
        - "rw"
        - "sync"
        - "no_root_squash"
        - "fsid=0"
    - path: /export/public
      state: present
      options:
      - clients: "192.168.0.0/24"
        permissions:
        - "rw"
        - "sync"
        - "root_squash"
        - "fsid=0"
      - clients: "*"
        permissions:
        - "ro"
        - "async"
        - "all_squash"
        - "fsid=1"

必须变成：

        [
            {
                "options": "192.168.0.0/24(rw,sync,no_root_squash,fsid=0)",
                "path": "/export/home",
                "state": "present"
            },
            {
                "options": "192.168.0.0/24(rw,sync,root_squash,fsid=0) *(ro,async,all_squash,fsid=1)",
                "path": "/export/public",
                "state": "present"
            }
        ]

到目前为止，我可以使用{{ nfs_exports | json_query(query) }}

query: "[].{path:path,state:state,options:options.join(` `,[].join(``,[clients,`(`,join(`,`,permissions),`)`]))}"

得到

{
        "options": "192.168.0.0/24(rw,sync,no_root_squash,fsid=0)",
        "path": "/export/home",
        "state": "present"
},
{
        "options": "192.168.0.0/24(rw,sync,root_squash,fsid=0)*(ro,async,all_squash,fsid=1)",
        "path": "/export/public",
        "state": "present"
}

这可能很简单，但我无法通过最后一个选项加入，space ' ' 被删除。 因此，如果有人知道正确的查询，我们将不胜感激。

Answer 1

给定查询：

[].{ path: path, state: state, options: join(' ', options[].join('', [clients, '(', join(',', permissions), ')'])) }

在 JSON 上

{
  "nfs_exports": [
    {
      "path": "/export/home",
      "state": "present",
      "options": [
        {
          "clients": "192.168.0.0/24",
          "permissions": [
            "rw",
            "sync",
            "no_root_squash",
            "fsid=0"
          ]
        }
      ]
    },
    {
      "path": "/export/public",
      "state": "present",
      "options": [
        {
          "clients": "192.168.0.0/24",
          "permissions": [
            "rw",
            "sync",
            "root_squash",
            "fsid=0"
          ]
        },
        {
          "clients": "*",
          "permissions": [
            "ro",
            "async",
            "all_squash",
            "fsid=1"
          ]
        }
      ]
    }
  ]
}

它会给你预期的输出：

[
  {
    "path": "/export/home",
    "state": "present",
    "options": "192.168.0.0/24(rw,sync,no_root_squash,fsid=0)"
  },
  {
    "path": "/export/public",
    "state": "present",
    "options": "192.168.0.0/24(rw,sync,root_squash,fsid=0) *(ro,async,all_squash,fsid=1)"
  }
]

请注意：字符串 litteral `` 不适用于空格字符串，因为正如文档中所指出的，它将被解析为 JSON：

文字表达式是允许指定任意 JSON 对象的表达式

^{来源：https://jmespath.org/specification.html#literal-expressions}

---

当您达到以下目的时，这很容易：

[].{ path: path, state: state, options: options[].join('', [clients, '(', join(',', permissions), ')']) }

这是你似乎已经实现的目标

[
  {
    "path": "/export/home",
    "state": "present",
    "options": [
      "192.168.0.0/24(rw,sync,no_root_squash,fsid=0)"
    ]
  },
  {
    "path": "/export/public",
    "state": "present",
    "options": [
      "192.168.0.0/24(rw,sync,root_squash,fsid=0)",
      "*(ro,async,all_squash,fsid=1)"
    ]
  }
]

因为您只剩下在options 中加入整个数组，并用空格作为粘合字符。