如何使用`json_query`过滤和重命名hasmap列表中的元素

Question

我正在尝试使用

json_query

从哈希映射列表中过滤和重命名一些元素

我的 ansible 事实中有以下示例数据：

"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，我期待的是：

"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出了什么问题以及如何更改它以获得正确的结果。

Answer 1

json_query

使用

jmespath

库。您应该查看教程、示例和规范

在您的具体情况下，您得到的结果与您编写的过滤器严格一致。以下任务是如何修改它以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}') }}"

使用您的示例数据给出：

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
        }
    ]
}

Answer 2

下面的

json_query完成了这项工作

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