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Using Ansible facts I can get the list of "ansible_mounts":

 "ansible_mounts": [ { "block_available": 423698, "block_size": 4096, "block_total": 507604, "block_used": 83906, "device": "/dev/sdb1", "fstype": "ext4", "inode_available": 130999, "inode_total": 131072, "inode_used": 73, "mount": "/boot", "options": "rw", "size_available": 1735467008, "size_total": 2079145984, "uuid": "b5cfa485-21d2-4e66-b3a3-80f250acf9d9" }, { "block_available": 42446481, "block_size": 4096, "block_total": 131007993, "block_used": 88561512, "device": "/dev/sdd1", "fstype": "xfs", "inode_available": 524243436, "inode_total": 524287936, "inode_used": 44500, "mount": "/u01", "options": "rw", "size_available": 173860786176, "size_total": 536608739328, "uuid": "f34a9499-ca4e-4db6-801a-16efb72a629d" }, { "block_available": 3010686, "block_size": 4096, "block_total": 4095466, "block_used": 1084780, "device": "/dev/sdc1", "fstype": "ext4", "inode_available": 984674, "inode_total": 1048576, "inode_used": 63902, "mount": "/", "options": "rw", "size_available": 12331769856, "size_total": 16775028736, "uuid": "829e9504-965b-4660-acc2-12d10d022a3c" } ],

How I can get the value of device where mount value is "/" ?

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1 Answer 1

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6

Use json_query. For example

 - set_fact: my_device: "{{ ansible_mounts|json_query(query) }}" vars: query: "[?mount=='/'].device " - debug: var: my_device

gives

 my_device: - /dev/sdc1

To get the first element of the list only append the filter first

 - set_fact: my_device: "{{ ansible_mounts|json_query(query)|first }}"
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  • to get only the value I should use {{ my_device[0] }} Commented Oct 23, 2019 at 14:16
  • 1
    Right. The result is a list because, generally, there might be more hits. It's also possible to append the filter {{ ansible_mounts|json_query(query)|first }} to get the first element of the list. Commented Oct 23, 2019 at 14:23

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