json - 如何使用 jq 从 Jenkins 构建 url 的 curl 中提取 userId？

Question

我从 curling Jenkins $BUILD_URL/api/json 得到以下输出:

itai@Itais-MBP ~ -  $ curl -s --insecure -u itaig:password  https://ip.us-west-2.compute.amazonaws.com/job/Company-Analytics-Prod-Deploy_New/24/api/json |
   jq -r '.actions[]'
{
  "_class": "hudson.model.CauseAction",
  "causes": [
    {
      "_class": "hudson.model.Cause$UserIdCause",
      "shortDescription": "Started by user Itai Ganot",
      "userId": "itaig",
      "userName": "Itai Ganot"
    }
  ]
}
{
  "_class": "hudson.model.CauseAction",
  "causes": [
    {
      "_class": "com.sonyericsson.rebuild.RebuildCause",
      "shortDescription": "Rebuilds build #23",
      "upstreamBuild": 23,
      "upstreamProject": "Company-Analytics-Prod-Deploy_New",
      "upstreamUrl": "view/Prod-US%20Deploy/job/Company-Analytics-Prod-Deploy_New/"
    }
  ]
}
{
  "_class": "hudson.model.ParametersAction",
  "parameters": [
    {
      "_class": "eu.markov.jenkins.plugin.mvnmeta.MavenMetadataParameterValue",
      "name": "Version"
    },
    {
      "_class": "hudson.model.StringParameterValue",
      "name": "region",
      "value": "us-east-1"
    },
    {
      "_class": "hudson.model.StringParameterValue",
      "name": "StackName",
      "value": "Company-Prd-21"
    },
    {
      "_class": "hudson.model.StringParameterValue",
      "name": "autostart",
      "value": "No"
    }
  ]
}
{}
{}
{
  "_class": "hudson.plugins.git.util.BuildData",
  "buildsByBranchName": {
    "refs/remotes/origin/master": {
      "_class": "hudson.plugins.git.util.Build",
      "buildNumber": 24,
      "buildResult": null,
      "marked": {
        "SHA1": "0e71efeac11c9909838453f4f103457ec3b04d27",
        "branch": [
          {
            "SHA1": "0e71efeac11c9909838453f4f103457ec3b04d27",
            "name": "refs/remotes/origin/master"
          }
        ]
      },
      "revision": {
        "SHA1": "0e71efeac11c9909838453f4f103457ec3b04d27",
        "branch": [
          {
            "SHA1": "0e71efeac11c9909838453f4f103457ec3b04d27",
            "name": "refs/remotes/origin/master"
          }
        ]
      }
    }
  },
  "lastBuiltRevision": {
    "SHA1": "0e71efeac11c9909838453f4f103457ec3b04d27",
    "branch": [
      {
        "SHA1": "0e71efeac11c9909838453f4f103457ec3b04d27",
        "name": "refs/remotes/origin/master"
      }
    ]
  },
  "remoteUrls": [
    "git@git.assembla.com:company.ci.git"
  ],
  "scmName": ""
}
{
  "_class": "hudson.plugins.git.GitTagAction"
}
{}
{}
{}
{}
{}
itai@Itais-MBP ~ -  $

我正在尝试提取开始构建作业的“userId”，因为当前可用的 Jenkins 插件由于某种原因无法正常工作。

这是我尝试过的，但它给了我一个错误:

itai@Itais-MBP ~ -  $ curl -s --insecure -u itaig:password  https://ip.us-west-2.compute.amazonaws.com/job/Company-Analytics-Prod-Deploy_New/24/api/json |
 jq -r '.actions[].causes[] | .userId'
itaig
null
jq: error (at <stdin>:0): Cannot iterate over null (null)
itai@Itais-MBP ~ -  $

我认为这与某些“.actions[]” block 中没有“.causes[]”有关，如果是这种情况，是否可以提取“userId”？

Answer 1

使用 jq，您可以使用后缀“?”来防止不存在运营商，例如在你的情况下:

.actions[].causes[]?.userId? | select(.)