genode/repos/gems/run/depot_autopilot.run

####################
## User interface ##
####################

#
# Additional environment variables considered by this run script
#
#   TEST_PKGS     list of test package-archives if set (default list below)
#   TEST_SRCS     list of test source-archive if TEST_PKGS is set (default list below)
#   TEST_BUILDS   list of test build-targets that shall be build from repos
#   TEST_MODULES  list of test boot-modules to overlay the test depot-content
#
# To get a hint which build components and which boot modules you may want to
# enter for a given test package-archive, please see these files:
#
#   repos/<REPO>/recipes/pkg/<TEST_PKG>/archives
#   repos/<REPO>/recipes/pkg/<TEST_PKG>/runtime (<content> tag)
#
# Example:
#
# ! KERNEL="nova" \
#   TEST_PKGS="test-libc_vfs test-log" \
#   TEST_BUILDS="server/ram_fs test/libc_vfs" \
#   TEST_MODULES="ram_fs test-libc_vfs vfs.lib.so" \
#   make run/depot_autopilot
#


##############################################################
## Local copies of run tool procedures with small adaptions ##
##                                                          ##
## FIXME: Adapt original and remove local copies            ##
##############################################################

proc autopilot_wait_for_output { wait_for_re timeout_value running_spawn_id } {
	global output
	global run_genode_failed

	if {$wait_for_re == "forever"} {
		set timeout -1
		interact {
			\003 {
				send_user "Expect: 'interact' received 'strg+c' and was cancelled\n";
				exit
			}
			-i $running_spawn_id
		}
	} else {
		set timeout $timeout_value
	}

	set platform_msg [run_boot_string]
	if {$platform_msg eq ""} {
		set platform_msg "undefined platform command startup string sequence"
	}

	expect {
		-i $running_spawn_id $platform_msg { puts stderr "Error: platform rebooted unexpectedly"; exit -4 }
		-i $running_spawn_id -re $wait_for_re { }

		# pistachio kernel fault
		-i $running_spawn_id -re {--- "KD# Exception caught" ---} {
			puts stderr "Error: Kernel fault";
			set run_genode_failed 1
			return
		}
		# sel4 unknown fault caught by core
		-i $running_spawn_id -re {Error: unexpected exception during fault.*stopped} {
			puts stderr "Error: Unknown fault";
			set run_genode_failed 1
			return
		}
		# can happen, for instance, on socat TCP-timeout
		eof {
			puts stderr "Error: Spawned process died unexpectedly";
			set run_genode_failed 1
			return
		}
		timeout {
			puts stderr "Error: Test execution timed out";
			set run_genode_failed 1
			return
		}
	}
	append output $expect_out(buffer)
}

proc autopilot_create_tar_from_depot_binaries { archive_path args } {

	# filter out api and src archives from requested depot content
	set content {}
	foreach subdir [_collect_from_depot $args] {
		if {[regexp [_depot_archive_versioned_path_pattern] $subdir dummy user type]} {
			if {$type == "src"} continue;
			if {$type == "api"} continue;
		}
		lappend content $subdir
	}

	check_for_missing_depot_archives

	eval "exec tar cf $archive_path -T /dev/null -C [depot_dir] [lsort -unique $content]"
}

proc autopilot_run_genode_until {{wait_for_re forever} {timeout_value 0} {running_spawn_id -1}} {
	#
	# If a running_spawn_id is specified, wait for the expected output
	#
	if {$running_spawn_id != -1} {
		autopilot_wait_for_output $wait_for_re $timeout_value $running_spawn_id
		return;
	}

	set retry 3
	while { $retry != 0 } {

		if {[expr [run_power_on] == false]} {
			puts "Power on step failed, retry."
			sleep 3
			incr retry -1;
			continue
		}

		if {![run_load]} {
			puts "Load step failed, retry."

			# kill the spawned load process if there is one
			if {[load_spawn_id] != -1} {
				set pid [exp_pid -i [load_spawn_id]]
				exec kill -9 $pid
			}

			incr retry -1;
			continue;
		}

		if {![run_log $wait_for_re $timeout_value]} {
			puts "Log step failed, retry."
			incr retry -1;
			continue;
		}

		return;
	}

	puts stderr "Boot process failed 3 times in series. I give up!";
	exit -1;
}


########################
## Utility procedures ##
########################

proc depot_user {} { return [get_cmd_arg --depot-user genodelabs] }

#
# Get value of an environment variable
#
proc get_env_var { var_name default_value } {
	if {[info exists ::env($var_name)]} {
		return $::env($var_name)
	}
	return $default_value
}

#
# Check if archives are available without doing anything with them
#
proc check_archives_available { args } {

	# filter out api and src archives from requested depot content
	set content {}
	foreach subdir [_collect_from_depot $args] {
		if {[regexp [_depot_archive_versioned_path_pattern] $subdir dummy user type]} {
			if {$type == "src"} continue;
			if {$type == "api"} continue;
		}
		lappend content $subdir
	}

	check_for_missing_depot_archives
}

#
# Return routes for boot modules that shall overlay the test-depot content
#
proc single_test_module_routes { } {

	global test_modules
	set result ""
	foreach module $test_modules {
		append result {
			<service name="ROM" label_last="} $module {"> <parent/> </service>}
	}
	return $result
}

#
# Return autopilot start-nodes for the test packages that shall be run
#
proc test_pkgs_start_nodes { } {

	global test_pkgs
	global skip_test_pkg

	set result ""
	foreach test_pkg $test_pkgs {
		if {[info exists skip_test_pkg($test_pkg)] && $skip_test_pkg($test_pkg)} {
			append result {
				<start name="} $test_pkg {" skip="true"/>}
		} else {
			append result {
				<start name="} $test_pkg {" pkg="} [depot_user] {/pkg/} $test_pkg {/} [_current_depot_archive_version pkg $test_pkg] {"/>}
		}
	}
	return $result
}


#
# Prepare to call run_genode_until (again, with a changed setup)
#
proc prepare_to_run_genode { } {

	global output
	global qemu_args
	global previous_results
	global previous_time_ms
	global previous_succeeded
	global previous_failed
	global previous_skipped
	global skip_test_pkg
	global test_pkgs
	global test_srcs
	global test_builds
	global test_modules
	global last_test_pkg
	global run_genode_failed
	global serial_id
	global timeout
	global initial_qemu_args

	set qemu_args $initial_qemu_args


	#
	# Create a depot archive that contains the test packages
	#

	create_boot_directory

	set depot_tar_archives ""
	set depot_tar_src_archives ""
	set import_archives ""

	foreach test_pkg $test_pkgs {
		if { [info exists skip_test_pkg($test_pkg)] } {
			append_if [expr !$skip_test_pkg($test_pkg)] depot_tar_archives " [depot_user]/pkg/$test_pkg "
		} else {
			append depot_tar_archives " [depot_user]/pkg/$test_pkg "
		}
	}

	foreach test_src_pkg $test_srcs {
		if { [info exists skip_test_pkg($test_src_pkg)] } {
			append_if [expr !$skip_test_pkg($test_src_pkg)] depot_tar_src_archives " [depot_user]/src/$test_src_pkg "
		} else {
			append depot_tar_src_archives " [depot_user]/src/$test_src_pkg "
		}
	}

	append import_archives {
		} [depot_user] {/src/} [base_src] {
		} [depot_user] {/src/report_rom
		} [depot_user] {/src/fs_rom
		} [depot_user] {/src/vfs
		} [depot_user] {/src/loader
		} [depot_user] {/src/init
		} [depot_user] {/src/depot_query
	}
	if {!$skip_test_pkg(test-lx_block)} {
		append import_archives [depot_user] {/raw/test-lx_block }
	}

	set all_archives [concat $depot_tar_archives $import_archives]
	check_archives_available {*}$all_archives

	autopilot_create_tar_from_depot_binaries [run_dir]/genode/depot.tar {*}$depot_tar_archives
	set depot_tar_wo_src_size [file size [run_dir]/genode/depot.tar]
	append_src_and_api_depot_packages_to_tar [run_dir]/genode/depot.tar {*}$depot_tar_src_archives
	set depot_tar_size [file size [run_dir]/genode/depot.tar]
	puts "Depot archive has a size of $depot_tar_size bytes ($depot_tar_wo_src_size bytes without sources)"

	#
	# Install the root-init config
	#
	append config {
	<config prio_levels="2">
		<parent-provides>
			<service name="ROM"/>
			<service name="IRQ"/>
			<service name="IO_PORT"/>
			<service name="IO_MEM"/>
			<service name="PD"/>
			<service name="RM"/>
			<service name="CPU"/>
			<service name="LOG"/>
			<service name="TRACE"/>
		</parent-provides>

		<default-route>
			<any-service> <parent/> <any-child/> </any-service>
		</default-route>
		<default caps="100"/>

		<start name="timer" priority="0">
			<resource name="RAM" quantum="1M"/>
			<provides> <service name="Timer"/> </provides>
		</start>

		<start name="report_rom" priority="-1">
			<binary name="report_rom"/>
			<resource name="RAM" quantum="2M"/>
			<provides> <service name="Report"/> <service name="ROM"/> </provides>
			<config verbose="no">
				<policy label="depot_autopilot -> blueprint" report="depot_query -> blueprint"/>
				<policy label="depot_query -> query"      report="depot_autopilot -> query"/>
				<policy label="dynamic -> config"         report="depot_autopilot -> init.config"/>
			</config>
		</start>

		<start name="vfs" priority="-1">
			<resource name="RAM" quantum="16M"/>
			<provides> <service name="File_system"/> </provides>
			<config>
				<vfs>
					<dir name="depot"> <tar name="depot.tar"/> </dir>
					<dir name="gcov_data"> <ram/> </dir>
				</vfs>
				<policy label="depot_query -> depot"             root="/depot" />
				<policy label="fs_rom -> "                       root="/depot" />
				<policy label="dynamic -> gcov -> gcov -> depot" root="/depot" />
				<policy label_suffix=" -> gcov_data"             root="/gcov_data" writeable="yes" />
			</config>
		</start>

		<start name="fs_rom" priority="-1" caps="300">
			<resource name="RAM" quantum="16M"/>
			<provides> <service name="ROM"/> </provides>
		</start>

		<start name="depot_query" priority="-1">
			<resource name="RAM" quantum="2M"/>
			<config query="rom">
				<vfs> <dir name="depot"> <fs label="depot"/> </dir> </vfs>
			</config>
			<route>
				<service name="ROM" label="query"> <child name="report_rom"/> </service>
				<any-service> <parent/> <any-child/> </any-service>
			</route>
		</start>

		<start name="depot_autopilot" priority="-1">
			<resource name="RAM" quantum="2M"/>
			<provides> <service name="LOG"/> </provides>
			<config arch="} [depot_spec] {" children_label_prefix="dynamic -> ">
				<static>
					<parent-provides>
						<service name="ROM"/>
						<service name="CPU"/>
						<service name="PD"/>
						<service name="LOG"/>
						<service name="RM"/>
						<service name="Timer"/>
						<service name="TRACE"/>
						<service name="File_system"/>
					</parent-provides>
				</static>
				<common_routes>

					} [single_test_module_routes] {

					<service name="ROM" label_last="ld.lib.so">           <parent/> </service>
					<service name="ROM" label_last="init">                <parent/> </service>
					<service name="CPU">                                  <parent/> </service>
					<service name="PD">                                   <parent/> </service>
					<service name="LOG">                                  <parent/> </service>
					<service name="Timer">                                <parent/> </service>
					<service name="RM">                                   <parent/> </service>
					<service name="TRACE">                                <parent/> </service>
					<service name="File_system" label="gcov -> depot">    <parent/> </service>
					<service name="File_system" label_suffix="gcov_data"> <parent/> </service>
				</common_routes>

				<previous-results time_sec="} [expr ($previous_time_ms + 999) / 1000] {"
				                  succeeded="} $previous_succeeded {"
				                  skipped="} $previous_skipped {"
				                  failed="} $previous_failed {">} [string map {\" .}  $previous_results] {</previous-results>

				} [test_pkgs_start_nodes] {

			</config>
			<route>
				<service name="PD"     unscoped_label="depot_autopilot"> <parent/>                  </service>
				<service name="CPU"    unscoped_label="depot_autopilot"> <parent/>                  </service>
				<service name="LOG"    unscoped_label="depot_autopilot"> <parent/>                  </service>
				<service name="ROM"    unscoped_label="depot_autopilot"> <parent/>                  </service>
				<service name="ROM"    unscoped_label="ld.lib.so">       <parent/>                  </service>
				<service name="ROM"    label="blueprint">                <child name="report_rom"/> </service>
				<service name="Report" label="query">                    <child name="report_rom"/> </service>
				<service name="Report" label="init.config">              <child name="report_rom"/> </service>
				<service name="Timer"  label="">                         <child name="timer"/>      </service>
			</route>
		</start>

		<start name="dynamic" caps="8000" priority="-1">
			<resource name="RAM" quantum="420M"/>
			<binary name="init"/>
			<route>

				} [single_test_module_routes] {

				<service name="ROM" label_last="ld.lib.so">   <parent/>                       </service>
				<service name="ROM" label_last="init">        <parent/>                       </service>
				<service name="ROM" label="config">           <child name="report_rom"/>      </service>
				<service name="ROM">                          <child name="fs_rom"/>          </service>
				<service name="LOG" unscoped_label="dynamic"> <parent/>                       </service>
				<service name="LOG">                          <child name="depot_autopilot"/> </service>
				<service name="Timer">                        <child name="timer"/>           </service>
				<any-service>                                 <parent/> <any-child/>          </any-service>
			</route>
		</start>

	</config>}
	install_config $config


	#
	# Create the rest of the boot modules
	#

	set build_components { app/depot_autopilot }
	append build_components $test_builds
	build $build_components

	import_from_depot {*}$import_archives


	#
	# Build boot image from boot modules
	#

	set boot_modules { depot_autopilot }
	append boot_modules $test_modules
	build_boot_image $boot_modules

	set last_test_pkg ""
	set run_genode_failed 0
	set serial_id -1
	set timeout 40

	append qemu_args "-nographic -serial mon:stdio "
}

#
# Initialize variables that accumulate test results for possible reboots
#
proc init_previous_results {} {
	global previous_results_on_exit
	global previous_results
	global previous_time_ms
	global previous_succeeded
	global previous_failed
	global previous_skipped

	set previous_results_on_exit 1
	set previous_results         ""
	set previous_time_ms         0
	set previous_succeeded       0
	set previous_failed          0
	set previous_skipped         0
}

rename exit run_tool_exit
proc exit {{status 0}} {

	global previous_results_on_exit
	global previous_results
	global previous_time_ms
	global previous_succeeded
	global previous_failed
	global previous_skipped

	if {![info exists previous_results_on_exit] || \
	    ![info exists previous_results] || \
	    ![info exists previous_time_ms] || \
	    ![info exists previous_succeeded] || \
	    ![info exists previous_failed] || \
	    ![info exists previous_skipped]} \
	{
		init_previous_results
	}
	if {$previous_results_on_exit != 0} {
		set previous_time_sec      [expr $previous_time_ms / 1000]
		set previous_time_sec_frac [expr $previous_time_ms - $previous_time_sec * 1000]
		set previous_results_list  [split $previous_results "\n"]
		puts ""
		puts "Failed to let Depot Autopilot finish!"
		puts "Result overview simulated by run script:"
		puts ""
		puts "\[init -> depot_autopilot] --- Finished after $previous_time_sec.$previous_time_sec_frac sec ---"
		puts "\[init -> depot_autopilot] "
		foreach previous_result $previous_results_list {
			puts "\[init -> depot_autopilot] $previous_result"
		}
		puts "\[init -> depot_autopilot] "
		puts "\[init -> depot_autopilot] succeeded: $previous_succeeded failed: $previous_failed skipped: $previous_skipped"
		puts "\[init -> depot_autopilot] "
	}
	run_tool_exit $status
}


##################
## Main routine ##
##################

#
# Check platform support
#
if {[expr ![have_spec x86] && \
          ![have_spec arm_v6] && \
          ![have_spec arm_v7a]] || \
    [expr [have_spec foc] && [have_spec panda]]} \
{
	puts "\n Run script is not supported on this platform. \n";
	exit 0
}

#
# Default list of test package-archives
#
# Was obtained by issuing:
#
# ! cd <GENODE_DIR>/repos
# ! find . -type d -wholename *recipes/pkg/test-* -printf '%f\n' | sort
#
set default_test_pkgs {
	test-ada
	test-ada_exception
	test-ada_secondary_stack
	test-blk
	test-blk_cache
	test-clipboard
	test-ds_ownership
	test-dynamic_config
	test-dynamic_config_loader
	test-dynamic_config_slave
	test-expat
	test-fault_detection
	test-fs_log
	test-fs_packet
	test-fs_report
	test-fs_rom_update
	test-fs_rom_update_fs
	test-fs_rom_update_ram
	test-init
	test-init_loop
	test-ldso
	test-libc
	test-libc_counter
	test-libc_getenv
	test-libc_pipe
	test-libc_vfs
	test-libc_vfs_audit
	test-libc_vfs_block
	test-libc_vfs_counter
	test-libc_vfs_fs
	test-libc_vfs_fs_chained
	test-libc_vfs_ram
	test-log
	test-lx_block
	test-magic_ring_buffer
	test-mmio
	test-new_delete
	test-nic_loopback
	test-part_blk_gpt
	test-part_blk_mbr
	test-pipe
	test-pthread
	test-python
	test-ram_fs_chunk
	test-read_only_rom
	test-reconstructible
	test-registry
	test-report_rom
	test-resource_request
	test-resource_yield
	test-rm_fault
	test-rm_fault_no_nox
	test-rm_nested
	test-rom_blk
	test-rom_filter
	test-rust
	test-sanitizer
	test-sequence
	test-signal
	test-slab
	test-solo5
	test-stdcxx
	test-synced_interface
	test-tcp_bulk_lwip
	test-tcp_bulk_lxip
	test-terminal_crosslink
	test-timed_semaphore
	test-timer
	test-trace
	test-trace_logger
	test-utf8
	test-vfs_stress_fs
	test-vfs_stress_ram
	test-weak_ptr
	test-xml_generator
	test-xml_node
	gcov
}

#
# Default list of test source-archives
#
set default_test_srcs {
	test-xml_generator
}

#
# Whether the platform supports non-executable dataspaces
#
proc non_executable_supported { } {
	if {[have_spec hw]   && [have_spec x86_64]} { return true }
	if {[have_spec hw]   && [have_spec arm]}    { return true }
	if {[have_spec nova] && [have_spec x86_64]} { return true }
	if {[have_spec foc]  && [have_spec x86_64]} { return true }
	if {[have_spec foc]  && [have_spec arm]}    { return true }
	if {[have_spec sel4] && [have_spec arm]}    { return true }
	return false
}

#
# Whether to skip a test - if undefined for a test, the test is not skipped
#
set skip_test_pkg(test-python)          [expr ![have_spec x86]]
set skip_test_pkg(test-slab)            [expr [get_cmd_switch --autopilot] && [have_include "power_on/qemu"]]
set skip_test_pkg(test-rm_nested)       [expr [have_spec linux]]
set skip_test_pkg(test-fault_detection) [expr [have_spec pistachio] || [have_spec fiasco]]
set skip_test_pkg(test-fs_packet)       [expr [get_cmd_switch --autopilot] && [have_include "power_on/qemu"]]
set skip_test_pkg(test-rm_fault)        [expr [have_spec linux] || ![non_executable_supported]]
set skip_test_pkg(test-rm_fault_no_nox) [expr [have_spec linux] || !$skip_test_pkg(test-rm_fault)]
set skip_test_pkg(test-lx_block)        [expr ![have_spec linux]]
set skip_test_pkg(test-tcp_bulk_lwip)   [expr ![have_spec x86]]
set skip_test_pkg(test-tcp_bulk_lxip)   [expr ![have_spec x86]]
set skip_test_pkg(test-solo5)           [expr ![have_spec x86_64]]
set skip_test_pkg(test-libc)            [expr [have_spec sel4] || [have_spec rpi] || [expr [have_spec pbxa9] && [have_spec foc]] || [expr [have_spec imx53] && [have_spec trustzone]]]

#
# FIXME
#
# When doing the libc_getenv test on autopilot+foc+x86 and one of the
# subsequent tests crashes the system so it gets rebooted by the run script,
# the system doesn't come up again. It gets stuck after core initialization.
#
set skip_test_pkg(test-libc_getenv) [expr [get_cmd_switch --autopilot] && [have_spec foc] && [have_spec x86]]

# remember initial qemu args in case we have to re-boot later
set initial_qemu_args ""
if {[info exists qemu_args]} {
	set initial_qemu_args $qemu_args
}

#
# Initialize the lists of test package-archives, source-archives,
# build-targets, and boot-modules to be considered by the run script
#
set test_pkgs    [get_env_var TEST_PKGS    ""]
set test_srcs    [get_env_var TEST_SRCS    ""]
set test_builds  [get_env_var TEST_BUILDS  ""]
set test_modules [get_env_var TEST_MODULES ""]

#
# If the user didn't declare an individual list of test package-archives, use
# the default lists of test package-archives and source-archives
#
set nr_of_tests_to_run 0
if {$test_pkgs == ""} {
	foreach test_pkg $default_test_pkgs {
		append test_pkgs " $test_pkg "
		if {!([info exists skip_test_pkg($test_pkg)] && $skip_test_pkg($test_pkg))} {
			incr nr_of_tests_to_run
		}
	}
	foreach test_src_pkg $default_test_srcs {
		append test_srcs " $test_src_pkg "
	}
} else {
	foreach test_pkg $test_pkgs {
		if {!([info exists skip_test_pkg($test_pkg)] && $skip_test_pkg($test_pkg))} {
			incr nr_of_tests_to_run
		}
	}
}
puts "Number of tests to run: $nr_of_tests_to_run"

# initialize variables that hold previous results
init_previous_results

# generic preparation for each system boot
prepare_to_run_genode

while {1} {

	# wait for the next autopilot event
	if {$serial_id == -1} {
		autopilot_run_genode_until {depot_autopilot\] --- .*?\n} $timeout
		set serial_id [output_spawn_id]

		# if the system didn't even boot, exit (prints previous results)
		if {$run_genode_failed} {
			exit -1
		}
	} else {
		set init_time_ms [clock clicks -millisec]
		autopilot_run_genode_until {depot_autopilot\] --- .*?\n} $timeout $serial_id
		set previous_time_ms [expr $previous_time_ms + [expr ([clock clicks -millisec] - $init_time_ms)] ]
		set serial_id [output_spawn_id]

		# remove last test from list and check if we have to reboot the system
		set test_pkgs [lsearch -all -inline -not -exact $test_pkgs $last_test_pkg]
		if {$run_genode_failed} {

			# shut-down running system
			exec kill -9 [exp_pid -i $serial_id]
			run_power_off

			# remember result of last test
			if {$previous_results != ""} {
				append previous_results \012
			}
			append previous_results { } [format {%-31s %-6s  %7s} $last_test_pkg "failed " "$timeout.000"] {  reboot}
			incr previous_failed

			# prepare system re-boot
			prepare_to_run_genode
			continue
		}
	}
	# if the autopilot finished all tests, evaluate its return value
	if {[regexp {depot_autopilot\] --- Finished} $output]} {
		set output ""
		run_genode_until {child "depot_autopilot" exited with exit value.*?\n} 10 $serial_id
		set previous_results_on_exit 0
		grep_output {^\[init\] }
		compare_output_to {[init] child "depot_autopilot" exited with exit value 0}
		exit 0
	}
	# if the autopilot started a new test, set a new timeout
	if {[regexp {depot_autopilot\] --- Run} $output]} {

		if {$last_test_pkg != ""} {

			# remember result of last test in case the system must be restartet
			set last_test_result ""
			regexp {depot_autopilot\] ( [^\033]+)} $output ignored last_test_result
			regsub -all {<}  $last_test_result {\&lt;} last_test_result

			set failed_off  [string first " failed"  $last_test_result]
			set skipped_off [string first " skipped" $last_test_result]
			set ok_off      [string first " ok"      $last_test_result]

			if {$failed_off > 0 && ($skipped_off < 0 || $failed_off < $skipped_off) && ($ok_off < 0 || $failed_off < $ok_off)} {
				incr previous_failed
			} elseif {$skipped_off > 0 && ($ok_off < 0 || $skipped_off < $ok_off)} {
				incr previous_skipped
			} elseif {$ok_off > 0} {
				incr previous_succeeded
			} else {
				puts "Error: malformed test result"
				puts $last_test_result
				exit -1
			}

			if {$previous_results != ""} {
				append previous_results \012
			}
			append previous_results $last_test_result
		}

		# determine timeout for the next timeout
		set min_timeout 10
		regexp {depot_autopilot\] --- Run "(.*?)" \(max ([0-9]*?) } $output] ignore last_test_pkg min_timeout
		set timeout [expr $min_timeout + 10]

		set output ""
	}
}