Apply Failed: Pull request must be mergeable before running apply. (gitlab)

[kunal2791]

Atlantis failing to properly detect GitLab Merge Requests (MR) as mergeable, even when they meet the criteria (such as pipeline passed, approvals received, and no conflicts).

if apply_requirement set to mergeable.

this is config file.

repos:

• id: "/.*/"
  allowed_overrides: [workflow]
  pre_workflow_hooks:
  • run: rm -rf ~/.kube
  • run: tac_wrapper
    #post_workflow_hooks:
    #- run: '[ -f atlantis.yaml ] && { rm atlantis.yaml && echo "File deleted."; } || echo "Not found"'
    workflow: terragrunt
    delete_source_branch_on_merge: true
    apply_requirements: [mergeable]
    workflows:
    terragrunt:
    plan:
    steps:
    • run: rm -rf .terragrunt-cache
    • run: terragrunt plan
      apply:
      steps:
    • run: terragrunt apply

[dosubot]

Hey @kunal2791! I'm here to help you with your GitLab Merge Requests issue. I can assist with bug fixes, answer your questions, and guide you on how to become a contributor. Let's get this sorted out!

Atlantis might be failing to detect GitLab Merge Requests (MR) as mergeable due to several conditions that need to be met. The PullIsMergeable function in Atlantis checks various criteria, including the status of the pipeline, the merge request's detailed merge status, approvals, blocking discussions, and whether the merge request is a work in progress.

Here is a relevant code snippet from the PullIsMergeable function:

if ((supportsDetailedMergeStatus &&
    (mr.DetailedMergeStatus == "mergeable" ||
        mr.DetailedMergeStatus == "ci_still_running" ||
        mr.DetailedMergeStatus == "ci_must_pass" ||
        mr.DetailedMergeStatus == "need_rebase")) ||
    (!supportsDetailedMergeStatus &&
        mr.MergeStatus == "can_be_merged")) && //nolint:staticcheck // Need to reference deprecated field for backwards compatibility
    mr.ApprovalsBeforeMerge <= 0 &&
    mr.BlockingDiscussionsResolved &&
    !mr.WorkInProgress &&
    (allowSkippedPipeline || !isPipelineSkipped) {

    logger.Debug("Merge request is mergeable")
    return true, nil
}
logger.Debug("Merge request is not mergeable")
return false, nil

If any of these conditions are not met, the merge request will not be considered mergeable by Atlantis ^[1].

Additionally, there are similar issues reported by other users:

1. Gitlab MR with approvals_before_merge > 0 causes issues with mergeable requirement - This issue suggests that Atlantis checks the wrong GitLab resource for approvals. It should check the approvals_left field instead of approvals_before_merge ^[2].
2. Atlantis apply succeeds on unmergeable MR with apply_requirements mergeable in Gitlab - This issue was reproduced and confirmed to fail correctly in version v0.28.5 of Atlantis ^[3].
3. Preventing merging without running atlantis apply on Gitlab - This issue discusses adding commit status updates to ensure proper mergeability checks ^[4].

You might want to verify if the approvals_left field is being checked correctly and ensure that all other conditions in the PullIsMergeable function are met.

To continue talking to Dosu, mention @dosu.

[ctmuthu]

@dosu. We do get the same error message but in github PR, but in log we found that atlantis is unable to read the response.

Unable to check pull mergeable status, error: getting pull request status: fetching rulesets, branch protections and status checks from GraphQL: Something went wrong while executing your query.

unable to get pull request status: fetching mergeability status for repo: test-org/test-iac, and pull number: xx: getting pull request status: fetching rulesets, branch protections and status checks from GraphQL: Something went wrong while executing your query.