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# frozen_string_literal: true
# This model stores pull requests coming from external providers, such as
# GitHub, when GitLab project is set as CI/CD only and remote mirror.
#
# When setting up a remote mirror with GitHub we subscribe to push and
# pull_request webhook events. When a pull request is opened on GitHub,
# a webhook is sent out, we create or update the status of the pull
# request locally.
#
# When the mirror is updated and changes are pushed to branches we check
# if there are open pull requests for the source and target branch.
# If so, we create pipelines for external pull requests.
class ExternalPullRequest < ApplicationRecord
include Gitlab::Utils::StrongMemoize
include ShaAttribute
belongs_to :project
sha_attribute :source_sha
sha_attribute :target_sha
validates :source_branch, presence: true
validates :target_branch, presence: true
validates :source_sha, presence: true
validates :target_sha, presence: true
validates :source_repository, presence: true
validates :target_repository, presence: true
validates :status, presence: true
enum status: {
open: 1,
closed: 2
}
# We currently don't support pull requests from fork, so
# we are going to return an error to the webhook
validate :not_from_fork
scope :by_source_branch, ->(branch) { where(source_branch: branch) }
scope :by_source_repository, -> (repository) { where(source_repository: repository) }
def self.create_or_update_from_params(params)
find_params = params.slice(:project_id, :source_branch, :target_branch)
safe_find_or_initialize_and_update(find: find_params, update: params) do |pull_request|
yield(pull_request) if block_given?
end
end
def actual_branch_head?
actual_source_branch_sha == source_sha
end
def from_fork?
source_repository != target_repository
end
def source_ref
Gitlab::Git::BRANCH_REF_PREFIX + source_branch
end
def predefined_variables
Gitlab::Ci::Variables::Collection.new.tap do |variables|
variables.append(key: 'CI_EXTERNAL_PULL_REQUEST_IID', value: pull_request_iid.to_s)
variables.append(key: 'CI_EXTERNAL_PULL_REQUEST_SOURCE_BRANCH_SHA', value: source_sha)
variables.append(key: 'CI_EXTERNAL_PULL_REQUEST_TARGET_BRANCH_SHA', value: target_sha)
variables.append(key: 'CI_EXTERNAL_PULL_REQUEST_SOURCE_BRANCH_NAME', value: source_branch)
variables.append(key: 'CI_EXTERNAL_PULL_REQUEST_TARGET_BRANCH_NAME', value: target_branch)
end
end
private
def actual_source_branch_sha
project.commit(source_ref)&.sha
end
def not_from_fork
if from_fork?
errors.add(:base, 'Pull requests from fork are not supported')
end
end
def self.safe_find_or_initialize_and_update(find:, update:)
safe_ensure_unique(retries: 1) do
model = find_or_initialize_by(find)
if model.update(update)
yield(model) if block_given?
end
model
end
end
end
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