Script to get Jenkins CentOS versions?

[zil...@gmail.com]

I want to use the Groovy script in this post to get Jenkins versions. So I do this, where I change the docker_image_tags_url to point to a Jenkins end point.

// Import the JsonSlurper class to parse Dockerhub API response

import groovy.json.JsonSlurper

// Set the URL we want to read from, it is MySQL from official Library for this example, limited to 20 results only.

docker_image_tags_url = "https://hub.docker.com/v2/repositories/library/jenkins/tags?page_size=30"

try {

    // Set requirements for the HTTP GET request, you can add Content-Type headers and so on...

    def http_client = new URL(docker_image_tags_url).openConnection() as HttpURLConnection

    http_client.setRequestMethod('GET')

    // Run the HTTP request

    http_client.connect()

    // Prepare a variable where we save parsed JSON as a HashMap, it's good for our use case, as we just need the 'name' of each tag.

    def dockerhub_response = [:]    

    // Check if we got HTTP 200, otherwise exit

    if (http_client.responseCode == 200) {

        dockerhub_response = new JsonSlurper().parseText(http_client.inputStream.getText('UTF-8'))

    } else {

        println("HTTP response error")

        System.exit(0)

    }

    // Prepare a List to collect the tag names into

    def image_tag_list = []

    // Iterate the HashMap of all Tags and grab only their "names" into our List

    dockerhub_response.results.each { tag_metadata ->

        image_tag_list.add(tag_metadata.name)    

    }

    // The returned value MUST be a Groovy type of List or a related type (inherited from List)

    // It is necessary for the Active Choice plugin to display results in a combo-box

    return image_tag_list.sort()

} catch (Exception e) {

         // handle exceptions like timeout, connection errors, etc.

         println(e)

}

However, it just returns Alpine versions. How can I get the CentOS versions?

Thanks,

Chris

[zil...@gmail.com]

I essentially want to get this list, but in a JSON format in an HTTP response. But using this link as my docker_image_tags_url value for my script doesn't work of course, that is, it gives a blank list.

https://hub.docker.com/r/jenkins/jenkins/tags?page_size=20&page=1&ordering=last_updated.

[Slide]

This might get you started: https://gist.github.com/kizbitz/e59f95f7557b4bbb8bf2

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[zil...@gmail.com]

That's what I essentially have already. Just need the correct docker_image_tags_url value, and that post didn't tell me.

[Björn Pedersen]

The problem  probably is that the centos image is not in the first  30 results . You would need to get the next page(s) until you find a centos image.
See https://docs.docker.com/registry/spec/api/#tags for details. And remember that this endpoint has a limit on the numbe rof requests in a certain timeframe, so be sure to cache the result.

[zil...@gmail.com]

Yeah that makes sense. Thanks.

Chris

[zil...@gmail.com]

I read the page you linked, and the part regarding tags pagination. I infer from the page that I should be able to get a list of tags with the following.

https://hub.docker.com/v2/repositories/library/jenkins/tags/list

But if I paste the URL on my browser, I get

"txnid": "REPOSREQ-29168001-2818-486d-9af5-45c455b6155e",

  "message": "tag 'list' not found",

  "errinfo": {

    "api_call_docker_id": "",

    "api_call_name": "GetRepositoryTag",

    "api_call_start": "2020-11-26T16:03:21.274810611Z",

    "api_call_txnid": "REPOSREQ-29168001-2818-486d-9af5-45c455b6155e",

    "namespace": "library",

    "repository": "jenkins",

    "tag": "list"

  }

}

[Björn Pedersen]

try https://registry.hub.docker.com/v2/library/jenkins/tags/list

[zil...@gmail.com]

Thanks again. I get the following even though I give it my Docker Hub creds, which i'm able to use to log in.

{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":[{"Type":"repository","Class":"","Name":"library/jenkins","Action":"pull"}]}]}