jq:錯誤：語法錯誤，如果，在檢查物件是否存在時出現意外，如果不存在則添加默認值

在決議 kubernetes kubectl 命令時獲取 jq: 錯誤: 語法錯誤，如果（Unix shell 參考問題？） kubectl get pv -o=json | jq -c '.items[] | {name: .metadata.name, claimName: .spec | if has("claimRef") then .claimRef.name else empty end }'

嘗試獲取具有 PVC 的 PV，如果沒有 PVC，則可以為 null 或空。如果它為空或為空，則為它繪制名稱和它們各自的 PVC 的映射。

下面是 jq 命令的示例輸入或命令的輸出 kubectl get pv -o=json

    "apiVersion": "v1",
    "items": [{
            "apiVersion": "v1",
            "kind": "PersistentVolume",
            "metadata": {
                "annotations": {
                    "meta.helm.sh/release-name": "",
                    "meta.helm.sh/release-namespace": ""
                },
                "creationTimestamp": "",
                "finalizers": [
                    ""
                ],
                "labels": {
                    "app.kubernetes.io/managed-by": ""
                },
                "name": "",
                "resourceVersion": "",
                "uid": ""
            },
            "spec": {
                "accessModes": [
                    "ReadWriteMany"
                ],
                "capacity": {
                    "storage": ""
                },
                "claimRef": {
                    "apiVersion": "",
                    "kind": "",
                    "name": "",
                    "namespace": "",
                    "resourceVersion": "",
                    "uid": ""
                },
                "csi": {
                    "driver": "",
                    "volumeHandle": ""
                },
                "persistentVolumeReclaimPolicy": "",
                "volumeMode": ""
            },
            "status": {
                "phase": ""
            }
        },
        {
            "apiVersion": "v1",
            "kind": "PersistentVolume",
            "metadata": {
                "annotations": {
                    "meta.helm.sh/release-name": "",
                    "meta.helm.sh/release-namespace": ""
                },
                "creationTimestamp": "",
                "finalizers": [
                    ""
                ],
                "labels": {
                    "app.kubernetes.io/managed-by": ""
                },
                "name": "",
                "resourceVersion": "",
                "uid": ""
            },
            "spec": {
                "accessModes": [
                    "ReadWriteMany"
                ],
                "capacity": {
                    "storage": ""
                },
                "claimRef": {
                    "apiVersion": "",
                    "kind": "",
                    "name": "",
                    "namespace": "",
                    "resourceVersion": "",
                    "uid": ""
                },
                "csi": {
                    "driver": "",
                    "volumeHandle": ""
                },
                "persistentVolumeReclaimPolicy": "",
                "volumeMode": ""
            },
            "status": {
                "phase": ""
            }
        }
    ],
    "kind": "List",
    "metadata": {
        "resourceVersion": "",
        "selfLink": ""
    }
}```

For data security have removed the data and only kept the keys
Please help

uj5u.com熱心網友回復：

將括號括在claimName欄位的值周圍：

{
  name: .metadata.name,
  claimName: (.spec | if has("claimRef") then .claimRef.name else empty end)
}

根據您簡化示例的程度，您可以考慮將if陳述句減少為：

{
  name: .metadata.name,
  claimName: (.spec.claimRef.name? // empty)
}

請注意，在這兩種情況下，.claimName如果相應的測驗將失敗，不僅整個物件都會消失。

標籤：猛击 贝壳 Kubernetes 知乎 kubectl

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