{
    "$id": "https://example.com/entry-schema",
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "description": "JSON Schema for an fstab entry",
    "type": "object",
    "required": [
        "storage"
    ],
    "properties": {
        "storage": {
            "type": "object",
            "oneOf": [
                {
                    "$ref": "#/$defs/diskDevice"
                },
                {
                    "$ref": "#/$defs/diskUUID"
                },
                {
                    "$ref": "#/$defs/nfs"
                },
                {
                    "$ref": "#/$defs/tmpfs"
                }
            ]
        },
        "fstype": {
            "enum": [
                "ext3",
                "ext4",
                "btrfs"
            ]
        },
        "options": {
            "type": "array",
            "minItems": 1,
            "items": {
                "type": "string"
            },
            "uniqueItems": true
        },
        "readonly": {
            "type": "boolean"
        }
    },
    "$defs": {
        "diskDevice": {
            "properties": {
                "type": {
                    "enum": [
                        "disk"
                    ]
                },
                "device": {
                    "type": "string",
                    "pattern": "^/dev/[^/]+(/[^/]+)*$"
                }
            },
            "required": [
                "type",
                "device"
            ],
            "additionalProperties": false
        },
        "diskUUID": {
            "properties": {
                "type": {
                    "enum": [
                        "disk"
                    ]
                },
                "label": {
                    "type": "string",
                    "pattern": "^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}$"
                }
            },
            "required": [
                "type",
                "label"
            ],
            "additionalProperties": false
        },
        "nfs": {
            "properties": {
                "type": {
                    "enum": [
                        "nfs"
                    ]
                },
                "remotePath": {
                    "type": "string",
                    "pattern": "^(/[^/]+)+$"
                },
                "server": {
                    "type": "string",
                    "oneOf": [
                        {
                            "format": "hostname"
                        },
                        {
                            "format": "ipv4"
                        },
                        {
                            "format": "ipv6"
                        }
                    ]
                }
            },
            "required": [
                "type",
                "server",
                "remotePath"
            ],
            "additionalProperties": false
        },
        "tmpfs": {
            "properties": {
                "type": {
                    "enum": [
                        "tmpfs"
                    ]
                },
                "sizeInMB": {
                    "type": "integer",
                    "minimum": 16,
                    "maximum": 512
                }
            },
            "required": [
                "type",
                "sizeInMB"
            ],
            "additionalProperties": false
        }
    }
}