2019-05-21 21:14:22 +00:00
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# frozen_string_literal: true
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module MergeRequests
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class MergeabilityCheckService < ::BaseService
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include Gitlab::Utils::StrongMemoize
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delegate :project, :merge_ref_auto_sync_enabled?, to: :@merge_request
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delegate :repository, to: :project
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def initialize(merge_request)
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@merge_request = merge_request
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end
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# Updates the MR merge_status. Whenever it switches to a can_be_merged state,
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# the merge-ref is refreshed.
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#
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# recheck - When given, it'll enforce a merge-ref refresh if the current merge_status is
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2019-06-20 17:38:28 +00:00
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# can_be_merged or cannot_be_merged and merge-ref is outdated.
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2019-05-21 21:14:22 +00:00
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# Given MergeRequests::RefreshService is called async, it might happen that the target
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# branch gets updated, but the MergeRequest#merge_status lags behind. So in scenarios
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# where we need the current state of the merge ref in repository, the `recheck`
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# argument is required.
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#
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# Returns a ServiceResponse indicating merge_status is/became can_be_merged
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# and the merge-ref is synced. Success in case of being/becoming mergeable,
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# error otherwise.
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def execute(recheck: false)
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return ServiceResponse.error(message: 'Invalid argument') unless merge_request
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return ServiceResponse.error(message: 'Unsupported operation') if Gitlab::Database.read_only?
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recheck! if recheck
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update_merge_status
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unless merge_request.can_be_merged?
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return ServiceResponse.error(message: 'Merge request is not mergeable')
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end
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unless merge_ref_auto_sync_enabled?
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return ServiceResponse.error(message: 'Merge ref is outdated due to disabled feature')
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end
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ServiceResponse.success(payload: payload)
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end
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private
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attr_reader :merge_request
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def payload
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strong_memoize(:payload) do
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{
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merge_ref_head: merge_ref_head_payload
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}
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end
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end
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def merge_ref_head_payload
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commit = merge_request.merge_ref_head
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return unless commit
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target_id, source_id = commit.parent_ids
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{
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commit_id: commit.id,
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source_id: source_id,
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target_id: target_id
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}
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end
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def update_merge_status
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return unless merge_request.recheck_merge_status?
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if can_git_merge? && merge_to_ref
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merge_request.mark_as_mergeable
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else
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merge_request.mark_as_unmergeable
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end
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end
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def recheck!
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2019-06-20 17:38:28 +00:00
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if !merge_request.recheck_merge_status? && outdated_merge_ref?
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merge_request.mark_as_unchecked
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end
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end
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# Checks if the existing merge-ref is synced with the target branch.
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#
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# Returns true if the merge-ref does not exists or is out of sync.
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def outdated_merge_ref?
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return false unless merge_ref_auto_sync_enabled?
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return true unless ref_head = merge_request.merge_ref_head
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return true unless target_sha = merge_request.target_branch_sha
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return true unless source_sha = merge_request.source_branch_sha
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ref_head.parent_ids != [target_sha, source_sha]
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2019-05-21 21:14:22 +00:00
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end
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def can_git_merge?
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!merge_request.broken? && repository.can_be_merged?(merge_request.diff_head_sha, merge_request.target_branch)
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end
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def merge_to_ref
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return true unless merge_ref_auto_sync_enabled?
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result = MergeRequests::MergeToRefService.new(project, merge_request.author).execute(merge_request)
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result[:status] == :success
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end
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end
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end
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