如何使用“json_query”过滤和重命名哈希映射列表中的元素

Question

我正在尝试使用 json_query

从哈希图列表中过滤和重命名某些元素

我的 ansible facts 中有以下示例数据：

"ansible_mounts": [
    {
        "block_used": 136260,
        "uuid": "fa28207c-c4cf-4afd-a2e8-7090c3e4263e",
        "size_total": 2136997888,
        "block_total": 521728,
        "mount": "/disk1",
        "block_available": 385468,
        "size_available": 1578876928,
        "fstype": "xfs",
        "inode_total": 1048576,
        "inode_available": 1048572,
        "device": "/dev/sdb1",
        "inode_used": 4,
        "block_size": 4096,
        "options": "rw,seclabel,relatime,attr2,inode64,noquota"
    },
    {
        "block_used": 443460,
        "uuid": "f2a3d15f-f63a-4b07-bfe6-aa1fa3366c58",
        "size_total": 3210739712,
        "block_total": 783872,
        "mount": "/mnt/disk2",
        "block_available": 340412,
        "size_available": 1394327552,
        "fstype": "xfs",
        "inode_total": 1572864,
        "inode_available": 1572860,
        "device": "/dev/sdb2",
        "inode_used": 4,
        "block_size": 4096,
        "options": "rw,seclabel,relatime,attr2,inode64,noquota"
    },
    {
        "block_used": 482382,
        "uuid": "17764e52-0259-4918-b8c6-d4b99041db75",
        "size_total": 10725883904,
        "block_total": 2618624,
        "mount": "/",
        "block_available": 2136242,
        "size_available": 8750047232,
        "fstype": "xfs",
        "inode_total": 5242368,
        "inode_available": 5184047,
        "device": "/dev/sda1",
        "inode_used": 58321,
        "block_size": 4096,
        "options": "rw,seclabel,relatime,attr2,inode64,noquota"
    }
]

目前我正在使用以下查询：

- set_fact:
    mountlist: "{{ ansible_mounts | json_query('{device: [*].device, name: [*].mount, size: [*].size_available}') }}"

- debug:
    msg: "{{ mountlist }}"

我得到以下结果：

"msg": {
  "device": [
    "/dev/sdb1", 
    "/dev/sdb2", 
    "/dev/sda1"
  ], 
  "name": [
    "/disk1", 
    "/mnt/disk2", 
    "/"
  ], 
  "size": [
    1578876928, 
    1394327552, 
    8736772096
  ]
}

然而，我期望的是：

"msg": [
   {
      "name": "/disk1",
      "device": "/dev/sdb1"
      "size": 1578876928
   },
   {
      "name": "/mnt/disk2",
      "device": "/dev/sdb2"
      "size": 1394327552
   },
   {
      "name": "/",
      "device": "/dev/sda1"
      "size": 8736772096
   }
]

我无法弄清楚我的查询有什么问题以及如何更改它以获得正确的结果。

Answer 1

json_query下面的工作

- set_fact:
    mountlist: "{{ ansible_mounts|
                   json_query('[*].{mount: mount,
                                   device: device,
                                   size: size_available}')
                                   }}"

Answer 2

json_query 使用 jmespath library. You should review the tutorial, examples and specification

在您的具体情况下，您获得的结果与您编写的过滤器严格一致。要获得您期望的结果，您必须对其进行修改。以下任务是获得所需结果的示例：

- name: Filter + Rename elements from my source list
  debug:
    msg: "{{ ansible_mounts | json_query('[].{device: device, name: mount, size: size_available}') }}"

这是使用您的示例数据的结果：

TASK [Filter + Rename elements from my source list] ***********************************************************************************************************************************************************************
ok: [localhost] => {
    "msg": [
        {
            "device": "/dev/sdb1",
            "name": "/disk1",
            "size": 1578876928
        },
        {
            "device": "/dev/sdb2",
            "name": "/mnt/disk2",
            "size": 1394327552
        },
        {
            "device": "/dev/sda1",
            "name": "/",
            "size": 8750047232
        }
    ]
}

如何使用“json_query”过滤和重命名哈希映射列表中的元素

How to filter and rename elements in a list of hasmaps with `json_query`

ansible

json-query