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module MergeRequests
# MergeService class
#
# Do git merge and in case of success
# mark merge request as merged and execute all hooks and notifications
# Executed when you do merge via GitLab UI
#
class MergeService < MergeRequests::BaseService
MergeError = Class.new(StandardError)
attr_reader :merge_request, :source
def execute(merge_request)
if project.merge_requests_ff_only_enabled && !self.is_a?(FfMergeService)
FfMergeService.new(project, current_user, params).execute(merge_request)
return
end
@merge_request = merge_request
error_check!
merge_request.in_locked_state do
if commit
after_merge
clean_merge_jid
success
end
end
rescue MergeError => e
handle_merge_error(log_message: e.message, save_message_on_model: true)
end
private
def error_check!
error =
if @merge_request.should_be_rebased?
'Only fast-forward merge is allowed for your project. Please update your source branch'
elsif !@merge_request.mergeable?
'Merge request is not mergeable'
elsif !source
'No source for merge'
end
raise MergeError, error if error
end
def commit
message = params[:commit_message] || merge_request.merge_commit_message
commit_id = repository.merge(current_user, source, merge_request, message)
raise MergeError, 'Conflicts detected during merge' unless commit_id
merge_request.update(merge_commit_sha: commit_id)
rescue Gitlab::Git::HooksService::PreReceiveError => e
raise MergeError, e.message
rescue StandardError => e
raise MergeError, "Something went wrong during merge: #{e.message}"
ensure
merge_request.update(in_progress_merge_commit_sha: nil)
end
def after_merge
MergeRequests::PostMergeService.new(project, current_user).execute(merge_request)
if delete_source_branch?
DeleteBranchService.new(@merge_request.source_project, branch_deletion_user)
.execute(merge_request.source_branch)
end
end
def clean_merge_jid
merge_request.update_column(:merge_jid, nil)
end
def branch_deletion_user
@merge_request.force_remove_source_branch? ? @merge_request.author : current_user
end
# Verify again that the source branch can be removed, since branch may be protected,
# or the source branch may have been updated, or the user may not have permission
#
def delete_source_branch?
params.fetch('should_remove_source_branch', @merge_request.force_remove_source_branch?) &&
@merge_request.can_remove_source_branch?(branch_deletion_user)
end
def handle_merge_error(log_message:, save_message_on_model: false)
Rails.logger.error("MergeService ERROR: #{merge_request_info} - #{log_message}")
@merge_request.update(merge_error: log_message) if save_message_on_model
end
def merge_request_info
merge_request.to_reference(full: true)
end
def source
@source ||= @merge_request.diff_head_sha
end
end
end
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