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# frozen_string_literal: true
module Gitlab
module Git
class MergeBase
include Gitlab::Utils::StrongMemoize
def initialize(repository, refs)
@repository = repository
@refs = refs
end
# Returns the SHA of the first common ancestor
def sha
if unknown_refs.any?
raise UnknownRef, "Can't find merge base for unknown refs: #{unknown_refs.inspect}"
end
strong_memoize(:sha) do
@repository.merge_base(*commits_for_refs)
end
end
# Returns the merge base as a Gitlab::Git::Commit
def commit
return unless sha
@commit ||= @repository.commit_by(oid: sha)
end
# Returns the refs passed on initialization that aren't found in
# the repository, and thus cannot be used to find a merge base.
def unknown_refs
@unknown_refs ||= Hash[@refs.zip(commits_for_refs)]
.select { |ref, commit| commit.nil? }.keys
end
private
def commits_for_refs
@commits_for_refs ||= @repository.commits_by(oids: @refs)
end
end
end
end
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