Gitlab AutoMerge Http Error 405 Method Not Allowed

[josephlim75]

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Gitlab Premium v16.8.0-ee - RenovateBot/39.69.2

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As per the log below, i'm getting HttpError 405 when I use the renovate.json configuration below. If I switch to a different renovate.json as shown in renovate2.json the automerge were successful. What configuration am I missing here ? Also attached the Gitlab MR Screenshot. The different i see is that the one that successful actually run a stability pipeline. This also confirm the token used is valid and is able to perform merging. I confirm the PAT has all the permissions including admin.

renovate.json (Http error 405)

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "minimumReleaseAge": "3 days",
  "prHourlyLimit": 0,
  "prConcurrentLimit": 0,
  "enabledManagers": ["asdf", "custom.regex"],
  "customManagers": [
    {
        "customType": "regex",
        "fileMatch": [
            "(^|/)docker.env$"
        ],
        "matchStrings": [
          "# renovate: datasource=(?<datasource>[a-z-.]+?)(?: registryUrl=(?<registryUrl>.+?))?(?: depName=(?<depName>.+?))? packageName=(?<packageName>.+?)(?: versioning=(?<versioning>[a-z-]+?))?\\s(?:ENV|ARG|export) .+?_VERSION=(?<currentValue>[^\\s@]+)(@(?<currentDigest>sha256:[0-9a-f]+))?\\s"
        ]
    }
  ],
"packageRules": [
    {
      "matchUpdateTypes": ["patch"],
      "addLabels": ["dependencies", "patch"]
    },
    {
      "matchUpdateTypes": ["minor"],
      "addLabels": ["dependencies", "minor"]
    },
    {
      "matchUpdateTypes": ["major"],
      "addLabels": ["dependencies", "major"]
    },
    {
      "matchUpdateTypes": ["patch", "minor"],
      "matchCurrentVersion": "!/^0/",
      "automerge": true
    }
  ]
}

renovate2.json (Success)

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "minimumReleaseAge": "3 days",
  "prHourlyLimit": 0,
  "prConcurrentLimit": 0,
  "packageRules": [
    {
      "matchUpdateTypes": ["patch"],
      "addLabels": ["dependencies", "patch"]
    },
    {
      "matchUpdateTypes": ["minor"],
      "addLabels": ["dependencies", "minor"]
    },
    {
      "matchUpdateTypes": ["major"],
      "addLabels": ["dependencies", "major"]
    },
    {
      "matchUpdateTypes": ["patch", "minor"],
      "matchCurrentVersion": "!/^0/",
      "automerge": true
    }
  ]
}

Successful AutoMerge PR Screenshot

Unsuccessful AutoMerge PR Screenshot

Gitlab MR Configuration

I have disable check pipeline succeed so that MR should merge regardless of pipeline status.

Logs (if relevant)

Logs

 Automerge on PR creation failed. Retrying 5 (repository=jlim/renovate-test2, branch=renovate/alpine-3.x)
       "err": {
         "name": "HTTPError",
         "code": "ERR_NON_2XX_3XX_RESPONSE",
         "timings": {
           "start": 1734770306150,
           "socket": 1734770306151,
           "lookup": 1734770306151,
           "connect": 1734770306151,
           "secureConnect": 1734770306151,
           "upload": 1734770306153,
           "response": 1734770306291,
           "end": 1734770306292,
           "phases": {
             "wait": 1,
             "dns": 0,
             "tcp": 0,
             "tls": 0,
             "request": 2,
             "firstByte": 138,
             "download": 1,
             "total": 142
           }
         },
         "message": "Response code 405 (Method Not Allowed)",
         "stack": "HTTPError: Response code 405 (Method Not Allowed)\n    at Request.<anonymous> (/usr/local/renovate/node_modules/.pnpm/got@11.8.6/node_modules/got/dist/source/as-promise/index.js:118:42)\n    at processTicksAndRejections (node:internal/process/task_queues:105:5)",
         "options": {
           "headers": {
             "user-agent": "RenovateBot/39.69.2 (https://github.com/renovatebot/renovate)",
             "accept": "application/json",
             "authorization": "***********",
             "content-type": "application/json",
             "content-length": "72",
             "accept-encoding": "gzip, deflate, br"
           },
           "url": "https://<redacted>/api/v4/projects/jlim%2Frenovate-test2/merge_requests/14/merge",
           "hostType": "gitlab",
           "username": "",
           "password": "",
           "method": "PUT",
           "http2": false
         },
         "response": {
           "statusCode": 405,
           "statusMessage": "Method Not Allowed",
           "body": {"message": "405 Method Not Allowed"},
           "headers": {
             "date": "Sat, 21 Dec 2024 08:38:26 GMT",
             "content-type": "application/json",
             "content-length": "36",
             "connection": "keep-alive",
             "cache-control": "no-cache",
             "vary": "Origin",
             "x-content-type-options": "nosniff",
             "x-frame-options": "SAMEORIGIN",
             "x-gitlab-meta": "{\"correlation_id\":\"01JFM5WB5274KXS9VD4189RK10\",\"version\":\"1\"}",
             "x-request-id": "01JFM5WB5274KXS9VD4189RK10",
             "x-runtime": "0.086737",
             "strict-transport-security": "max-age=15724800; includeSubDomains"
           },
           "httpVersion": "1.1",
           "retryCount": 0
         }
       }

[josephlim75]

I think I finally found my own answer after reading this https://docs.renovatebot.com/key-concepts/automerge/. After adding the following 2 configuration into renovate.json, the automerge finally works !!

  "ignoreTests": true,
  "platformAutomerge": false,

[josephlim75]

If i don't set ignoreTests to true, it will not merge. Any solution / workaround you can recommend ?

[josephlim75]

Is there a way i force to run the stabilityDays job for customManagers like how docker managers run it ?

[josephlim75]

I think is safe to use ignoreTests if PR push doesn't runs a pipeline. Pipeline only runs after merging.

[viceice]

yes, in this case you need to disable the check.

we strongly discourage automerge without automated tests. you should run some pipelines on renovate branches.

[josephlim75]

Gotcha. Thanks for the input @viceice , very much appreciated. I'm closing the discussion.