class MergeRequestDiff < ActiveRecord::Base include Sortable include Importable include Gitlab::EncodingHelper # Prevent store of diff if commits amount more then 500 COMMITS_SAFE_SIZE = 100 # Valid types of serialized diffs allowed by Gitlab::Git::Diff VALID_CLASSES = [Hash, Rugged::Patch, Rugged::Diff::Delta].freeze belongs_to :merge_request has_many :merge_request_diff_files, -> { order(:merge_request_diff_id, :relative_order) } has_many :merge_request_diff_commits, -> { order(:merge_request_diff_id, :relative_order) } serialize :st_commits # rubocop:disable Cop/ActiveRecordSerialize serialize :st_diffs # rubocop:disable Cop/ActiveRecordSerialize state_machine :state, initial: :empty do state :collected state :overflow # Deprecated states: these are no longer used but these values may still occur # in the database. state :timeout state :overflow_commits_safe_size state :overflow_diff_files_limit state :overflow_diff_lines_limit end scope :viewable, -> { without_state(:empty) } # All diff information is collected from repository after object is created. # It allows you to override variables like head_commit_sha before getting diff. after_create :save_git_content, unless: :importing? def self.find_by_diff_refs(diff_refs) find_by(start_commit_sha: diff_refs.start_sha, head_commit_sha: diff_refs.head_sha, base_commit_sha: diff_refs.base_sha) end def self.select_without_diff select(column_names - ['st_diffs']) end def st_commits super || [] end # Collect information about commits and diff from repository # and save it to the database as serialized data def save_git_content MergeRequest .where('id = ? AND COALESCE(latest_merge_request_diff_id, 0) < ?', self.merge_request_id, self.id) .update_all(latest_merge_request_diff_id: self.id) ensure_commit_shas save_commits save_diffs keep_around_commits end def ensure_commit_shas self.start_commit_sha ||= merge_request.target_branch_sha self.head_commit_sha ||= merge_request.source_branch_sha self.base_commit_sha ||= find_base_sha save end # Override head_commit_sha to keep compatibility with merge request diff # created before version 8.4 that does not store head_commit_sha in separate db field. def head_commit_sha if persisted? && super.nil? last_commit_sha else super end end # This method will rely on repository branch sha # in case start_commit_sha is nil. Its necesarry for old merge request diff # created before version 8.4 to work def safe_start_commit_sha start_commit_sha || merge_request.target_branch_sha end def size real_size.presence || raw_diffs.size end def raw_diffs(options = {}) if options[:ignore_whitespace_change] @diffs_no_whitespace ||= compare.diffs(options) else @raw_diffs ||= {} @raw_diffs[options] ||= load_diffs(options) end end def commits @commits ||= load_commits end def last_commit_sha commit_shas.first end def first_commit commits.last end def base_commit return unless base_commit_sha project.commit(base_commit_sha) end def start_commit return unless start_commit_sha project.commit(start_commit_sha) end def head_commit return unless head_commit_sha project.commit(head_commit_sha) end def commit_shas if st_commits.present? st_commits.map { |commit| commit[:id] } else merge_request_diff_commits.map(&:sha) end end def diff_refs=(new_diff_refs) self.base_commit_sha = new_diff_refs&.base_sha self.start_commit_sha = new_diff_refs&.start_sha self.head_commit_sha = new_diff_refs&.head_sha end def diff_refs return unless start_commit_sha || base_commit_sha Gitlab::Diff::DiffRefs.new( base_sha: base_commit_sha, start_sha: start_commit_sha, head_sha: head_commit_sha ) end # MRs created before 8.4 don't store their true diff refs (start and base), # but we need to get a commit SHA for the "View file @ ..." link by a file, # so we use an approximation of the diff refs if we can't get the actual one. # # These will not be the actual diff refs if the target branch was merged into # the source branch after the merge request was created, but it is good enough # for the specific purpose of linking to a commit. # # It is not good enough for highlighting diffs, so we can't simply pass # these as `diff_refs.` def fallback_diff_refs real_refs = diff_refs return real_refs if real_refs likely_base_commit_sha = (first_commit&.parent || first_commit)&.sha Gitlab::Diff::DiffRefs.new( base_sha: likely_base_commit_sha, start_sha: safe_start_commit_sha, head_sha: head_commit_sha ) end def diff_refs_by_sha? base_commit_sha? && head_commit_sha? && start_commit_sha? end def diffs(diff_options = nil) Gitlab::Diff::FileCollection::MergeRequestDiff.new(self, diff_options: diff_options) end def project merge_request.target_project end def compare @compare ||= Gitlab::Git::Compare.new( repository.raw_repository, safe_start_commit_sha, head_commit_sha ) end def latest? self == merge_request.merge_request_diff end def compare_with(sha) # When compare merge request versions we want diff A..B instead of A...B # so we handle cases when user does squash and rebase of the commits between versions. # For this reason we set straight to true by default. CompareService.new(project, head_commit_sha).execute(project, sha, straight: true) end def commits_count if st_commits.present? st_commits.size else merge_request_diff_commits.size end end def utf8_st_diffs return [] if st_diffs.blank? st_diffs.map do |diff| diff.each do |k, v| diff[k] = encode_utf8(v) if v.respond_to?(:encoding) end end end private # Old GitLab implementations may have generated diffs as ["--broken-diff"]. # Avoid an error 500 by ignoring bad elements. See: # https://gitlab.com/gitlab-org/gitlab-ce/issues/20776 def valid_raw_diff?(raw) return false unless raw.respond_to?(:each) raw.any? { |element| VALID_CLASSES.include?(element.class) } end def create_merge_request_diff_files(diffs) rows = diffs.map.with_index do |diff, index| diff_hash = diff.to_hash.merge( binary: false, merge_request_diff_id: self.id, relative_order: index ) # Compatibility with old diffs created with Psych. diff_hash.tap do |hash| diff_text = hash[:diff] if diff_text.encoding == Encoding::BINARY && !diff_text.ascii_only? hash[:binary] = true hash[:diff] = [diff_text].pack('m0') end end end Gitlab::Database.bulk_insert('merge_request_diff_files', rows) end def load_diffs(options) return Gitlab::Git::DiffCollection.new([]) unless diffs_from_database raw = diffs_from_database if paths = options[:paths] raw = raw.select do |diff| paths.include?(diff[:old_path]) || paths.include?(diff[:new_path]) end end Gitlab::Git::DiffCollection.new(raw, options) end def diffs_from_database return @diffs_from_database if defined?(@diffs_from_database) @diffs_from_database = if st_diffs.present? if valid_raw_diff?(st_diffs) st_diffs end elsif merge_request_diff_files.present? merge_request_diff_files.map(&:to_hash) end end def load_commits commits = st_commits.presence || merge_request_diff_commits commits.map { |commit| Commit.from_hash(commit.to_hash, project) } end def save_diffs new_attributes = {} if compare.commits.size.zero? new_attributes[:state] = :empty else diff_collection = compare.diffs(Commit.max_diff_options) new_attributes[:real_size] = diff_collection.real_size if diff_collection.any? new_attributes[:state] = :collected create_merge_request_diff_files(diff_collection) end # Set our state to 'overflow' to make the #empty? and #collected? # methods (generated by StateMachine) return false. # # This attribution has to come at the end of the method so 'overflow' # state does not get overridden by 'collected'. new_attributes[:state] = :overflow if diff_collection.overflow? end update(new_attributes) end def save_commits MergeRequestDiffCommit.create_bulk(self.id, compare.commits.reverse) merge_request_diff_commits.reload end def repository project.repository end def find_base_sha return unless head_commit_sha && start_commit_sha project.merge_base_commit(head_commit_sha, start_commit_sha).try(:sha) end def keep_around_commits [repository, merge_request.source_project.repository].each do |repo| repo.keep_around(start_commit_sha) repo.keep_around(head_commit_sha) repo.keep_around(base_commit_sha) end end end