+++ /dev/null
-# Copyright (C) The Arvados Authors. All rights reserved.
-#
-# SPDX-License-Identifier: AGPL-3.0
-
-require 'test_helper'
-require 'helpers/git_test_helper'
-require 'helpers/docker_migration_helper'
-
-class JobTest < ActiveSupport::TestCase
- include DockerMigrationHelper
- include GitTestHelper
-
- BAD_COLLECTION = "#{'f' * 32}+0"
-
- setup do
- set_user_from_auth :active
- end
-
- def job_attrs merge_me={}
- # Default (valid) set of attributes, with given overrides
- {
- script: "hash",
- script_version: "master",
- repository: "active/foo",
- }.merge(merge_me)
- end
-
- test "Job without Docker image doesn't get locator" do
- job = Job.new job_attrs
- assert job.valid?, job.errors.full_messages.to_s
- assert_nil job.docker_image_locator
- end
-
- { 'name' => [:links, :docker_image_collection_tag, :name],
- 'hash' => [:links, :docker_image_collection_hash, :name],
- 'locator' => [:collections, :docker_image, :portable_data_hash],
- }.each_pair do |spec_type, (fixture_type, fixture_name, fixture_attr)|
- test "Job initialized with Docker image #{spec_type} gets locator" do
- image_spec = send(fixture_type, fixture_name).send(fixture_attr)
- job = Job.new job_attrs(runtime_constraints:
- {'docker_image' => image_spec})
- assert job.valid?, job.errors.full_messages.to_s
- assert_equal(collections(:docker_image).portable_data_hash, job.docker_image_locator)
- end
-
- test "Job modified with Docker image #{spec_type} gets locator" do
- job = Job.new job_attrs
- assert job.valid?, job.errors.full_messages.to_s
- assert_nil job.docker_image_locator
- image_spec = send(fixture_type, fixture_name).send(fixture_attr)
- job.runtime_constraints['docker_image'] = image_spec
- assert job.valid?, job.errors.full_messages.to_s
- assert_equal(collections(:docker_image).portable_data_hash, job.docker_image_locator)
- end
- end
-
- test "removing a Docker runtime constraint removes the locator" do
- image_locator = collections(:docker_image).portable_data_hash
- job = Job.new job_attrs(runtime_constraints:
- {'docker_image' => image_locator})
- assert job.valid?, job.errors.full_messages.to_s
- assert_equal(image_locator, job.docker_image_locator)
- job.runtime_constraints = {}
- assert job.valid?, job.errors.full_messages.to_s + "after clearing runtime constraints"
- assert_nil job.docker_image_locator
- end
-
- test "locate a Docker image with a repository + tag" do
- image_repo, image_tag =
- links(:docker_image_collection_tag2).name.split(':', 2)
- job = Job.new job_attrs(runtime_constraints:
- {'docker_image' => image_repo,
- 'docker_image_tag' => image_tag})
- assert job.valid?, job.errors.full_messages.to_s
- assert_equal(collections(:docker_image).portable_data_hash, job.docker_image_locator)
- end
-
- test "can't locate a Docker image with a nonexistent tag" do
- image_repo = links(:docker_image_collection_tag).name
- image_tag = '__nonexistent tag__'
- job = Job.new job_attrs(runtime_constraints:
- {'docker_image' => image_repo,
- 'docker_image_tag' => image_tag})
- assert(job.invalid?, "Job with bad Docker tag valid")
- end
-
- [
- false,
- true
- ].each do |use_config|
- test "Job with no Docker image uses default docker image when configuration is set #{use_config}" do
- default_docker_image = collections(:docker_image)[:portable_data_hash]
- Rails.configuration.default_docker_image_for_jobs = default_docker_image if use_config
-
- job = Job.new job_attrs
- assert job.valid?, job.errors.full_messages.to_s
-
- if use_config
- refute_nil job.docker_image_locator
- assert_equal default_docker_image, job.docker_image_locator
- else
- assert_nil job.docker_image_locator
- end
- end
- end
-
- test "create a job with a disambiguated script_version branch name" do
- job = Job.
- new(script: "testscript",
- script_version: "heads/7387838c69a21827834586cc42b467ff6c63293b",
- repository: "active/shabranchnames",
- script_parameters: {})
- assert(job.save)
- assert_equal("abec49829bf1758413509b7ffcab32a771b71e81", job.script_version)
- end
-
- test "locate a Docker image with a partial hash" do
- image_hash = links(:docker_image_collection_hash).name[0..24]
- job = Job.new job_attrs(runtime_constraints:
- {'docker_image' => image_hash})
- assert job.valid?, job.errors.full_messages.to_s + " with partial hash #{image_hash}"
- assert_equal(collections(:docker_image).portable_data_hash, job.docker_image_locator)
- end
-
- { 'name' => 'arvados_test_nonexistent',
- 'hash' => 'f' * 64,
- 'locator' => BAD_COLLECTION,
- }.each_pair do |spec_type, image_spec|
- test "Job validation fails with nonexistent Docker image #{spec_type}" do
- Rails.configuration.remote_hosts = {}
- job = Job.new job_attrs(runtime_constraints:
- {'docker_image' => image_spec})
- assert(job.invalid?, "nonexistent Docker image #{spec_type} was valid")
- end
- end
-
- test "Job validation fails with non-Docker Collection constraint" do
- job = Job.new job_attrs(runtime_constraints:
- {'docker_image' => collections(:foo_file).uuid})
- assert(job.invalid?, "non-Docker Collection constraint was valid")
- end
-
- test "can create Job with Docker image Collection without Docker links" do
- image_uuid = collections(:unlinked_docker_image).portable_data_hash
- job = Job.new job_attrs(runtime_constraints: {"docker_image" => image_uuid})
- assert(job.valid?, "Job created with unlinked Docker image was invalid")
- assert_equal(image_uuid, job.docker_image_locator)
- end
-
- def check_attrs_unset(job, attrs)
- assert_empty(attrs.each_key.map { |key| job.send(key) }.compact,
- "job has values for #{attrs.keys}")
- end
-
- def check_creation_prohibited(attrs)
- begin
- job = Job.new(job_attrs(attrs))
- rescue ActiveModel::MassAssignmentSecurity::Error
- # Test passes - expected attribute protection
- else
- check_attrs_unset(job, attrs)
- end
- end
-
- def check_modification_prohibited(attrs)
- job = Job.new(job_attrs)
- attrs.each_pair do |key, value|
- assert_raises(NoMethodError) { job.send("{key}=".to_sym, value) }
- end
- check_attrs_unset(job, attrs)
- end
-
- test "can't create Job with Docker image locator" do
- check_creation_prohibited(docker_image_locator: BAD_COLLECTION)
- end
-
- test "can't assign Docker image locator to Job" do
- check_modification_prohibited(docker_image_locator: BAD_COLLECTION)
- end
-
- [
- {script_parameters: ""},
- {script_parameters: []},
- {script_parameters: {["foo"] => ["bar"]}},
- {runtime_constraints: ""},
- {runtime_constraints: []},
- {tasks_summary: ""},
- {tasks_summary: []},
- ].each do |invalid_attrs|
- test "validation failures set error messages: #{invalid_attrs.to_json}" do
- # Ensure valid_attrs doesn't produce errors -- otherwise we will
- # not know whether errors reported below are actually caused by
- # invalid_attrs.
- Job.new(job_attrs).save!
-
- err = assert_raises(ArgumentError) do
- Job.new(job_attrs(invalid_attrs)).save!
- end
- assert_match /parameters|constraints|summary/, err.message
- end
- end
-
- test "invalid script_version" do
- invalid = {
- script_version: "no/branch/could/ever/possibly/have/this/name",
- }
- err = assert_raises(ActiveRecord::RecordInvalid) do
- Job.new(job_attrs(invalid)).save!
- end
- assert_match /Script version .* does not resolve to a commit/, err.message
- end
-
- [
- # Each test case is of the following format
- # Array of parameters where each parameter is of the format:
- # attr name to be changed, attr value, and array of expectations (where each expectation is an array)
- [['running', false, [['state', 'Queued']]]],
- [['state', 'Running', [['started_at', 'not_nil']]]],
- [['is_locked_by_uuid', 'use_current_user_uuid', [['state', 'Queued']]], ['state', 'Running', [['running', true], ['started_at', 'not_nil'], ['success', 'nil']]]],
- [['running', false, [['state', 'Queued']]], ['state', 'Complete', [['success', true]]]],
- [['running', true, [['state', 'Running']]], ['cancelled_at', Time.now, [['state', 'Cancelled']]]],
- [['running', true, [['state', 'Running']]], ['state', 'Cancelled', [['cancelled_at', 'not_nil']]]],
- [['running', true, [['state', 'Running']]], ['success', true, [['state', 'Complete']]]],
- [['running', true, [['state', 'Running']]], ['success', false, [['state', 'Failed']]]],
- [['running', true, [['state', 'Running']]], ['state', 'Complete', [['success', true],['finished_at', 'not_nil']]]],
- [['running', true, [['state', 'Running']]], ['state', 'Failed', [['success', false],['finished_at', 'not_nil']]]],
- [['cancelled_at', Time.now, [['state', 'Cancelled']]], ['success', false, [['state', 'Cancelled'],['finished_at', 'nil'], ['cancelled_at', 'not_nil']]]],
- [['cancelled_at', Time.now, [['state', 'Cancelled'],['running', false]]], ['success', true, [['state', 'Cancelled'],['running', false],['finished_at', 'nil'],['cancelled_at', 'not_nil']]]],
- # potential migration cases
- [['state', nil, [['state', 'Queued']]]],
- [['state', nil, [['state', 'Queued']]], ['cancelled_at', Time.now, [['state', 'Cancelled']]]],
- [['running', true, [['state', 'Running']]], ['state', nil, [['state', 'Running']]]],
- ].each do |parameters|
- test "verify job status #{parameters}" do
- job = Job.create! job_attrs
- assert_equal 'Queued', job.state, "job.state"
-
- parameters.each do |parameter|
- expectations = parameter[2]
- if 'use_current_user_uuid' == parameter[1]
- parameter[1] = Thread.current[:user].uuid
- end
-
- if expectations.instance_of? Array
- job[parameter[0]] = parameter[1]
- assert_equal true, job.save, job.errors.full_messages.to_s
- expectations.each do |expectation|
- if expectation[1] == 'not_nil'
- assert_not_nil job[expectation[0]], expectation[0]
- elsif expectation[1] == 'nil'
- assert_nil job[expectation[0]], expectation[0]
- else
- assert_equal expectation[1], job[expectation[0]], expectation[0]
- end
- end
- else
- raise 'I do not know how to handle this expectation'
- end
- end
- end
- end
-
- test "Test job state changes" do
- all = ["Queued", "Running", "Complete", "Failed", "Cancelled"]
- valid = {"Queued" => all, "Running" => ["Complete", "Failed", "Cancelled"]}
- all.each do |start|
- all.each do |finish|
- if start != finish
- job = Job.create! job_attrs(state: start)
- assert_equal start, job.state
- job.state = finish
- job.save
- job.reload
- if valid[start] and valid[start].include? finish
- assert_equal finish, job.state
- else
- assert_equal start, job.state
- end
- end
- end
- end
- end
-
- test "Test job locking" do
- set_user_from_auth :active_trustedclient
- job = Job.create! job_attrs
-
- assert_equal "Queued", job.state
-
- # Should be able to lock successfully
- job.lock current_user.uuid
- assert_equal "Running", job.state
-
- assert_raises ArvadosModel::AlreadyLockedError do
- # Can't lock it again
- job.lock current_user.uuid
- end
- job.reload
- assert_equal "Running", job.state
-
- set_user_from_auth :project_viewer
- assert_raises ArvadosModel::AlreadyLockedError do
- # Can't lock it as a different user either
- job.lock current_user.uuid
- end
- job.reload
- assert_equal "Running", job.state
-
- assert_raises ArvadosModel::PermissionDeniedError do
- # Can't update fields as a different user
- job.update_attributes(state: "Failed")
- end
- job.reload
- assert_equal "Running", job.state
-
-
- set_user_from_auth :active_trustedclient
-
- # Can update fields as the locked_by user
- job.update_attributes(state: "Failed")
- assert_equal "Failed", job.state
- end
-
- test "admin user can cancel a running job despite lock" do
- set_user_from_auth :active_trustedclient
- job = Job.create! job_attrs
- job.lock current_user.uuid
- assert_equal Job::Running, job.state
-
- set_user_from_auth :spectator
- assert_raises do
- job.update_attributes!(state: Job::Cancelled)
- end
-
- set_user_from_auth :admin
- job.reload
- assert_equal Job::Running, job.state
- job.update_attributes!(state: Job::Cancelled)
- assert_equal Job::Cancelled, job.state
- end
-
- test "verify job queue position" do
- job1 = Job.create! job_attrs
- assert_equal 'Queued', job1.state, "Incorrect job state for newly created job1"
-
- job2 = Job.create! job_attrs
- assert_equal 'Queued', job2.state, "Incorrect job state for newly created job2"
-
- assert_not_nil job1.queue_position, "Expected non-nil queue position for job1"
- assert_not_nil job2.queue_position, "Expected non-nil queue position for job2"
- end
-
- SDK_MASTER = "ca68b24e51992e790f29df5cc4bc54ce1da4a1c2"
- SDK_TAGGED = "00634b2b8a492d6f121e3cf1d6587b821136a9a7"
-
- def sdk_constraint(version)
- {runtime_constraints: {
- "arvados_sdk_version" => version,
- "docker_image" => links(:docker_image_collection_tag).name,
- }}
- end
-
- def check_job_sdk_version(expected)
- job = yield
- if expected.nil?
- refute(job.valid?, "job valid with bad Arvados SDK version")
- else
- assert(job.valid?, "job not valid with good Arvados SDK version")
- assert_equal(expected, job.arvados_sdk_version)
- end
- end
-
- { "master" => SDK_MASTER,
- "commit2" => SDK_TAGGED,
- SDK_TAGGED[0, 8] => SDK_TAGGED,
- "__nonexistent__" => nil,
- }.each_pair do |search, commit_hash|
- test "creating job with SDK version '#{search}'" do
- check_job_sdk_version(commit_hash) do
- Job.new(job_attrs(sdk_constraint(search)))
- end
- end
-
- test "updating job from no SDK to version '#{search}'" do
- job = Job.create!(job_attrs)
- assert_nil job.arvados_sdk_version
- check_job_sdk_version(commit_hash) do
- job.runtime_constraints = sdk_constraint(search)[:runtime_constraints]
- job
- end
- end
-
- test "updating job from SDK version 'master' to '#{search}'" do
- job = Job.create!(job_attrs(sdk_constraint("master")))
- assert_equal(SDK_MASTER, job.arvados_sdk_version)
- check_job_sdk_version(commit_hash) do
- job.runtime_constraints = sdk_constraint(search)[:runtime_constraints]
- job
- end
- end
- end
-
- test "clear the SDK version" do
- job = Job.create!(job_attrs(sdk_constraint("master")))
- assert_equal(SDK_MASTER, job.arvados_sdk_version)
- job.runtime_constraints = {}
- assert(job.valid?, "job invalid after clearing SDK version")
- assert_nil(job.arvados_sdk_version)
- end
-
- test "job with SDK constraint, without Docker image is invalid" do
- sdk_attrs = sdk_constraint("master")
- sdk_attrs[:runtime_constraints].delete("docker_image")
- job = Job.create(job_attrs(sdk_attrs))
- refute(job.valid?, "Job valid with SDK version, without Docker image")
- sdk_errors = job.errors.messages[:arvados_sdk_version] || []
- refute_empty(sdk_errors.grep(/\bDocker\b/),
- "no Job SDK errors mention that Docker is required")
- end
-
- test "invalid to clear Docker image constraint when SDK constraint exists" do
- job = Job.create!(job_attrs(sdk_constraint("master")))
- job.runtime_constraints.delete("docker_image")
- refute(job.valid?,
- "Job with SDK constraint valid after clearing Docker image")
- end
-
- test "use migrated docker image if requesting old-format image by tag" do
- Rails.configuration.docker_image_formats = ['v2']
- add_docker19_migration_link
- job = Job.create!(
- job_attrs(
- script: 'foo',
- runtime_constraints: {
- 'docker_image' => links(:docker_image_collection_tag).name}))
- assert(job.valid?)
- assert_equal(job.docker_image_locator, collections(:docker_image_1_12).portable_data_hash)
- end
-
- test "use migrated docker image if requesting old-format image by pdh" do
- Rails.configuration.docker_image_formats = ['v2']
- add_docker19_migration_link
- job = Job.create!(
- job_attrs(
- script: 'foo',
- runtime_constraints: {
- 'docker_image' => collections(:docker_image).portable_data_hash}))
- assert(job.valid?)
- assert_equal(job.docker_image_locator, collections(:docker_image_1_12).portable_data_hash)
- end
-
- [[:docker_image, :docker_image, :docker_image_1_12],
- [:docker_image_1_12, :docker_image, :docker_image_1_12],
- [:docker_image, :docker_image_1_12, :docker_image_1_12],
- [:docker_image_1_12, :docker_image_1_12, :docker_image_1_12],
- ].each do |existing_image, request_image, expect_image|
- test "if a #{existing_image} job exists, #{request_image} yields #{expect_image} after migration" do
- Rails.configuration.docker_image_formats = ['v1']
-
- if existing_image == :docker_image
- oldjob = Job.create!(
- job_attrs(
- script: 'foobar1',
- runtime_constraints: {
- 'docker_image' => collections(existing_image).portable_data_hash}))
- oldjob.reload
- assert_equal(oldjob.docker_image_locator,
- collections(existing_image).portable_data_hash)
- elsif existing_image == :docker_image_1_12
- assert_raises(ActiveRecord::RecordInvalid,
- "Should not resolve v2 image when only v1 is supported") do
- oldjob = Job.create!(
- job_attrs(
- script: 'foobar1',
- runtime_constraints: {
- 'docker_image' => collections(existing_image).portable_data_hash}))
- end
- end
-
- Rails.configuration.docker_image_formats = ['v2']
- add_docker19_migration_link
-
- # Check that both v1 and v2 images get resolved to v2.
- newjob = Job.create!(
- job_attrs(
- script: 'foobar1',
- runtime_constraints: {
- 'docker_image' => collections(request_image).portable_data_hash}))
- newjob.reload
- assert_equal(newjob.docker_image_locator,
- collections(expect_image).portable_data_hash)
- end
- end
-
- test "can't create job with SDK version assigned directly" do
- check_creation_prohibited(arvados_sdk_version: SDK_MASTER)
- end
-
- test "can't modify job to assign SDK version directly" do
- check_modification_prohibited(arvados_sdk_version: SDK_MASTER)
- end
-
- test "job validation fails when collection uuid found in script_parameters" do
- bad_params = {
- script_parameters: {
- 'input' => {
- 'param1' => 'the collection uuid zzzzz-4zz18-012345678901234'
- }
- }
- }
- assert_raises(ActiveRecord::RecordInvalid,
- "created job with a collection uuid in script_parameters") do
- Job.create!(job_attrs(bad_params))
- end
- end
-
- test "job validation succeeds when no collection uuid in script_parameters" do
- good_params = {
- script_parameters: {
- 'arg1' => 'foo',
- 'arg2' => [ 'bar', 'baz' ],
- 'arg3' => {
- 'a' => 1,
- 'b' => [2, 3, 4],
- }
- }
- }
- job = Job.create!(job_attrs(good_params))
- assert job.valid?
- end
-
- test 'update job uuid tag in internal.git when version changes' do
- authorize_with :active
- j = jobs :queued
- j.update_attributes repository: 'active/foo', script_version: 'b1'
- assert_equal('1de84a854e2b440dc53bf42f8548afa4c17da332',
- internal_tag(j.uuid))
- j.update_attributes repository: 'active/foo', script_version: 'master'
- assert_equal('077ba2ad3ea24a929091a9e6ce545c93199b8e57',
- internal_tag(j.uuid))
- end
-
- test 'script_parameters_digest is independent of key order' do
- j1 = Job.new(job_attrs(script_parameters: {'a' => 'a', 'ddee' => {'d' => 'd', 'e' => 'e'}}))
- j2 = Job.new(job_attrs(script_parameters: {'ddee' => {'e' => 'e', 'd' => 'd'}, 'a' => 'a'}))
- assert j1.valid?
- assert j2.valid?
- assert_equal(j1.script_parameters_digest, j2.script_parameters_digest)
- end
-
- test 'job fixtures have correct script_parameters_digest' do
- Job.all.each do |j|
- d = j.script_parameters_digest
- assert_equal(j.update_script_parameters_digest, d,
- "wrong script_parameters_digest for #{j.uuid}")
- end
- end
-
- test 'deep_sort_hash on array of hashes' do
- a = {'z' => [[{'a' => 'a', 'b' => 'b'}]]}
- b = {'z' => [[{'b' => 'b', 'a' => 'a'}]]}
- assert_equal Job.deep_sort_hash(a).to_json, Job.deep_sort_hash(b).to_json
- end
-
- test 'find_reusable without logging' do
- Rails.logger.expects(:info).never
- try_find_reusable
- end
-
- test 'find_reusable with logging' do
- Rails.configuration.log_reuse_decisions = true
- Rails.logger.expects(:info).at_least(3)
- try_find_reusable
- end
-
- def try_find_reusable
- foobar = jobs(:foobar)
- example_attrs = {
- script_version: foobar.script_version,
- script: foobar.script,
- script_parameters: foobar.script_parameters,
- repository: foobar.repository,
- }
-
- # Two matching jobs exist with identical outputs. The older one
- # should be reused.
- j = Job.find_reusable(example_attrs, {}, [], [users(:active)])
- assert j
- assert_equal foobar.uuid, j.uuid
-
- # Two matching jobs exist with different outputs. Neither should
- # be reused.
- Job.where(uuid: jobs(:job_with_latest_version).uuid).
- update_all(output: 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa+1')
- assert_nil Job.find_reusable(example_attrs, {}, [], [users(:active)])
-
- # ...unless config says to reuse the earlier job in such cases.
- Rails.configuration.reuse_job_if_outputs_differ = true
- j = Job.find_reusable(example_attrs, {}, [], [users(:active)])
- assert_equal foobar.uuid, j.uuid
- end
-
- [
- true,
- false,
- ].each do |cascade|
- test "cancel job with cascade #{cascade}" do
- job = Job.find_by_uuid jobs(:running_job_with_components_at_level_1).uuid
- job.cancel cascade: cascade
- assert_equal Job::Cancelled, job.state
-
- descendents = ['zzzzz-8i9sb-jobcomponentsl2',
- 'zzzzz-d1hrv-picomponentsl02',
- 'zzzzz-8i9sb-job1atlevel3noc',
- 'zzzzz-8i9sb-job2atlevel3noc']
-
- jobs = Job.where(uuid: descendents)
- jobs.each do |j|
- assert_equal ('Cancelled' == j.state), cascade
- end
-
- pipelines = PipelineInstance.where(uuid: descendents)
- pipelines.each do |pi|
- assert_equal ('Paused' == pi.state), cascade
- end
- end
- end
-
- test 'cancelling a completed job raises error' do
- job = Job.find_by_uuid jobs(:job_with_latest_version).uuid
- assert job
- assert_equal 'Complete', job.state
-
- assert_raises(ArvadosModel::InvalidStateTransitionError) do
- job.cancel
- end
- end
-
- test 'cancelling a job with circular relationship with another does not result in an infinite loop' do
- job = Job.find_by_uuid jobs(:running_job_2_with_circular_component_relationship).uuid
-
- job.cancel cascade: true
-
- assert_equal Job::Cancelled, job.state
-
- child = Job.find_by_uuid job.components.collect{|_, uuid| uuid}[0]
- assert_equal Job::Cancelled, child.state
- end
-
- test 'enable legacy api configuration option = true' do
- Rails.configuration.enable_legacy_jobs_api = true
- check_enable_legacy_jobs_api
- assert_equal [], Rails.configuration.disable_api_methods
- end
-
- test 'enable legacy api configuration option = false' do
- Rails.configuration.enable_legacy_jobs_api = false
- check_enable_legacy_jobs_api
- assert_equal Disable_jobs_api_method_list, Rails.configuration.disable_api_methods
- end
-
- test 'enable legacy api configuration option = auto, has jobs' do
- Rails.configuration.enable_legacy_jobs_api = "auto"
- check_enable_legacy_jobs_api
- assert_equal [], Rails.configuration.disable_api_methods
- end
-
- test 'enable legacy api configuration option = auto, no jobs' do
- Rails.configuration.enable_legacy_jobs_api = "auto"
- act_as_system_user do
- Job.destroy_all
- end
- puts "ZZZ #{Job.count}"
- check_enable_legacy_jobs_api
- assert_equal Disable_jobs_api_method_list, Rails.configuration.disable_api_methods
- end
-end
projects / arvados.git / blobdiff