src/test/shell/integration/linux-sandbox_test.sh - bazel - Git at Google

 #!/bin/bash
 #
 # Copyright 2015 The Bazel Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #    http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
 # Test sandboxing spawn strategy
 #

 set -euo pipefail

 # Load the test setup defined in the parent directory
 CURRENT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 source "${CURRENT_DIR}/../integration_test_setup.sh" \
   || { echo "integration_test_setup.sh not found!" >&2; exit 1; }
 source "${CURRENT_DIR}/../sandboxing_test_utils.sh" \
   || { echo "sandboxing_test_utils.sh not found!" >&2; exit 1; }
 source "${CURRENT_DIR}/execution_statistics_utils.sh" \
   || { echo "execution_statistics_utils.sh not found!" >&2; exit 1; }

 enable_errexit

 readonly OUT_DIR="${TEST_TMPDIR}/out"
 readonly OUT="${OUT_DIR}/outfile"
 readonly ERR="${OUT_DIR}/errfile"
 readonly SANDBOX_DIR="${OUT_DIR}/sandbox"
 readonly MOUNT_TARGET_ROOT="${TEST_TMPDIR}/targets"

 readonly CPU_TIME_SPENDER="${CURRENT_DIR}/../../../test/shell/integration/spend_cpu_time"

 SANDBOX_DEFAULT_OPTS="-W $SANDBOX_DIR"

 function set_up {
   rm -rf $OUT_DIR
   mkdir -p $SANDBOX_DIR
 }

 function test_basic_functionality() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -- /bin/echo hi there &> $TEST_log || fail
   expect_log "hi there"
 }

 function test_execvp_error_message_contains_path() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -- /does/not/exist --hello world &> $TEST_log || code=$?
   expect_log "\"execvp(/does/not/exist, 0x[[:alnum:]]*)\": No such file or directory"
 }

 function test_default_user_is_current_user() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -- /usr/bin/id &> $TEST_log || fail
   local current_uid_number="$(id -u)"
   # Expecting something like: uid=485038(ruperts) ...
   expect_log "uid=${current_uid_number}("
 }

 function test_user_switched_to_root() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -R -- /usr/bin/id &> $TEST_log || fail
   expect_log "uid=0(root) gid=0(root) groups=0(root)"
 }

 function test_user_switched_to_nobody() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -U -- /usr/bin/id &> $TEST_log || fail
   expect_log "uid=[0-9]\+(nobody) gid=[0-9]\+(\(nobody\|nogroup\)) groups=[0-9]\+(\(nobody\|nogroup\))"
 }

 function test_exit_code() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -- /bin/bash -c "exit 71" &> $TEST_log || code=$?
   assert_equals 71 "$code"
 }

 function test_signal_death() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -- /bin/bash -c 'kill -ABRT $$' &> $TEST_log || code=$?
   assert_equals 134 "$code" # SIGNAL_BASE + SIGABRT = 128 + 6
 }

 # Tests that even when the child catches SIGTERM and exits with code 0, that the sandbox exits with
 # code 142 (telling us about the expired timeout).
 function test_signal_catcher() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -T 2 -t 3 -- /bin/bash -c \
     'trap "echo later; exit 0" SIGINT SIGTERM SIGALRM; sleep 1000' &> $TEST_log || code=$?
   assert_equals 142 "$code" # SIGNAL_BASE + SIGALRM = 128 + 14
   expect_log "^later$"
 }

 function test_basic_timeout() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -T 3 -t 3 -- /bin/bash -c "echo before; sleep 1000; echo after" &> $TEST_log && fail
   expect_log "^before$" ""
 }

 function test_timeout_grace() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -T 2 -t 3 -- /bin/bash -c \
     'trap "echo -n before; sleep 1; echo -n after; exit 0" SIGINT SIGTERM SIGALRM; sleep 1000' &> $TEST_log || code=$?
   assert_equals 142 "$code" # SIGNAL_BASE + SIGALRM = 128 + 14
   expect_log "^beforeafter$"
 }

 function test_timeout_kill() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -T 2 -t 3 -- /bin/bash -c \
     'trap "echo before; sleep 1000; echo after; exit 0" SIGINT SIGTERM SIGALRM; sleep 1000' &> $TEST_log || code=$?
   assert_equals 142 "$code" # SIGNAL_BASE + SIGALRM = 128 + 14
   expect_log "^before$"
 }

 function test_debug_logging() {
   touch ${TEST_TMPDIR}/testfile
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -D -- /bin/true &> $TEST_log || code=$?
   expect_log "child exited normally with exitcode 0"
 }

 function test_mount_additional_paths_success() {
   mkdir -p ${TEST_TMPDIR}/foo
   mkdir -p ${TEST_TMPDIR}/bar
   touch ${TEST_TMPDIR}/testfile
   mkdir -p ${MOUNT_TARGET_ROOT}/foo
   touch ${MOUNT_TARGET_ROOT}/sandboxed_testfile

   touch /tmp/sandboxed_testfile
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -D \
     -M ${TEST_TMPDIR}/foo -m ${MOUNT_TARGET_ROOT}/foo \
     -M ${TEST_TMPDIR}/bar \
     -M ${TEST_TMPDIR}/testfile -m ${MOUNT_TARGET_ROOT}/sandboxed_testfile \
     -- /bin/true &> $TEST_log || code=$?
   # mount a directory to a customized path inside the sandbox
   expect_log "bind mount: ${TEST_TMPDIR}/foo -> ${MOUNT_TARGET_ROOT}/foo\$"
   # mount a directory to the same path inside the sanxbox
   expect_log "bind mount: ${TEST_TMPDIR}/bar -> ${TEST_TMPDIR}/bar\$"
   # mount a file to a customized path inside the sandbox
   expect_log "bind mount: ${TEST_TMPDIR}/testfile -> ${MOUNT_TARGET_ROOT}/sandboxed_testfile\$"
   expect_log "child exited normally with exitcode 0"
   rm -rf ${MOUNT_TARGET_ROOT}/foo
   rm -rf ${MOUNT_TARGET_ROOT}/sandboxed_testfile
 }

 function test_mount_additional_paths_relative_path() {
   touch ${TEST_TMPDIR}/testfile
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -D \
     -M ${TEST_TMPDIR}/testfile -m tmp/sandboxed_testfile \
     -- /bin/true &> $TEST_log || code=$?
   # mount a directory to a customized path inside the sandbox
   expect_log "The -m option must be used with absolute paths only.\$"
 }

 function test_mount_additional_paths_leading_m() {
   mkdir -p ${TEST_TMPDIR}/foo
   touch ${TEST_TMPDIR}/testfile
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -D \
     -m /tmp/foo \
     -M ${TEST_TMPDIR}/testfile -m /tmp/sandboxed_testfile \
     -- /bin/true &> $TEST_log || code=$?
   # mount a directory to a customized path inside the sandbox
   expect_log "The -m option must be strictly preceded by an -M option.\$"
 }

 function test_mount_additional_paths_m_not_preceeded_by_M() {
   mkdir -p ${TEST_TMPDIR}/foo
   mkdir -p ${TEST_TMPDIR}/bar
   touch ${TEST_TMPDIR}/testfile
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -D \
     -M ${TEST_TMPDIR}/testfile -m /tmp/sandboxed_testfile \
     -m /tmp/foo \
     -M ${TEST_TMPDIR}/bar \
     -- /bin/true &> $TEST_log || code=$?
   # mount a directory to a customized path inside the sandbox
   expect_log "The -m option must be strictly preceded by an -M option.\$"
 }

 function test_mount_additional_paths_other_flag_between_M_m_pair() {
   mkdir -p ${TEST_TMPDIR}/bar
   touch ${TEST_TMPDIR}/testfile
   $linux_sandbox $SANDBOX_DEFAULT_OPTS \
     -M ${TEST_TMPDIR}/testfile -D -m /tmp/sandboxed_testfile \
     -M ${TEST_TMPDIR}/bar \
     -- /bin/true &> $TEST_log || code=$?
   # mount a directory to a customized path inside the sandbox
   expect_log "The -m option must be strictly preceded by an -M option.\$"
 }

 function test_mount_additional_paths_multiple_sources_mount_to_one_target() {
   mkdir -p ${TEST_TMPDIR}/foo
   mkdir -p ${TEST_TMPDIR}/bar
   mkdir -p ${MOUNT_TARGET_ROOT}/foo
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -D \
     -M ${TEST_TMPDIR}/foo -m ${MOUNT_TARGET_ROOT}/foo \
     -M ${TEST_TMPDIR}/bar -m ${MOUNT_TARGET_ROOT}/foo \
     -- /bin/true &> $TEST_log || code=$?
   # mount a directory to a customized path inside the sandbox
   expect_log "bind mount: ${TEST_TMPDIR}/foo -> ${MOUNT_TARGET_ROOT}/foo\$"
   # mount a new source directory to the same target, which will overwrite the previous source path
   expect_log "bind mount: ${TEST_TMPDIR}/bar -> ${MOUNT_TARGET_ROOT}/foo\$"
   expect_log "child exited normally with exitcode 0"
   rm -rf ${MOUNT_TARGET_ROOT}/foo
 }

 function test_redirect_output() {
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -l $OUT -L $ERR -- /bin/bash -c "echo out; echo err >&2" &> $TEST_log || code=$?
   assert_equals "out" "$(cat $OUT)"
   assert_equals "err" "$(cat $ERR)"
 }

 function test_tmp_is_writable() {
   # If /tmp is not writable on the host, it won't be inside the sandbox.
   test -w /tmp || return 0

   $linux_sandbox $SANDBOX_DEFAULT_OPTS -w /tmp -- /bin/bash -c "rm -f $(mktemp --tmpdir=/tmp)" \
     &> $TEST_log || fail
 }

 function test_dev_shm_is_writable() {
   # If /dev/shm is not writable on the host, it won't be inside the sandbox.
   test -w /dev/shm || return 0

   # /dev/shm is often a symlink to /run/shm, thus we use readlink to get the canonical path.
   $linux_sandbox $SANDBOX_DEFAULT_OPTS -w "$(readlink -f /dev/shm)" -- /bin/bash -c "rm -f $(mktemp --tmpdir=/dev/shm)" \
     &> $TEST_log || fail
 }

 function assert_linux_sandbox_exec_time() {
   local user_time_low="$1"; shift
   local user_time_high="$1"; shift
   local sys_time_low="$1"; shift
   local sys_time_high="$1"; shift

   local local_tmp="$(mktemp -d "${OUT_DIR}/assert_linux_sandbox_exec_timeXXXX")"
   local stdout_path="${local_tmp}/stdout"
   local stderr_path="${local_tmp}/stderr"
   local stats_out_path="${local_tmp}/statsfile"
   local stats_out_decoded_path="${local_tmp}/statsfile.decoded"

   cp "${CPU_TIME_SPENDER}" "${SANDBOX_DIR}"
   local cpu_time_spender_sandbox_path="${SANDBOX_DIR}/spend_cpu_time"

   # Sandboxed process will be terminated after 100 seconds if not already dead.
   local code=0
   "${linux_sandbox}" \
       -W "${SANDBOX_DIR}" \
       -T 100 \
       -t 2 \
       -l "${stdout_path}" \
       -L "${stderr_path}" \
       -S "${stats_out_path}" \
       -- \
       "${cpu_time_spender_sandbox_path}" "${user_time_low}" "${sys_time_low}" \
       &> "${TEST_log}" || code="$?"
   sed -e 's,^subprocess stdout: ,,' "${stdout_path}" >>"${TEST_log}"
   sed -e 's,^subprocess stderr: ,,' "${stderr_path}" >>"${TEST_log}"
   assert_equals 0 "${code}"

   assert_execution_time_in_range \
       "${user_time_low}" \
       "${user_time_high}" \
       "${sys_time_low}" \
       "${sys_time_high}" \
       "${stats_out_path}"
 }

 function test_stats_high_user_time() {
   assert_linux_sandbox_exec_time 10 19 0 9
 }

 function test_stats_high_system_time() {
   assert_linux_sandbox_exec_time 0 9 10 19
 }

 function test_stats_high_user_time_and_high_system_time() {
   assert_linux_sandbox_exec_time 10 25 10 25
 }

 # The test shouldn't fail if the environment doesn't support running it.
 check_supported_platform || exit 0
 check_sandbox_allowed || exit 0

 run_suite "linux-sandbox"
	#!/bin/bash
	#
	# Copyright 2015 The Bazel Authors. All rights reserved.
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.
	#
	# Test sandboxing spawn strategy
	#

	set -euo pipefail

	# Load the test setup defined in the parent directory
	CURRENT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
	source "${CURRENT_DIR}/../integration_test_setup.sh" \
	\|\| { echo "integration_test_setup.sh not found!" >&2; exit 1; }
	source "${CURRENT_DIR}/../sandboxing_test_utils.sh" \
	\|\| { echo "sandboxing_test_utils.sh not found!" >&2; exit 1; }
	source "${CURRENT_DIR}/execution_statistics_utils.sh" \
	\|\| { echo "execution_statistics_utils.sh not found!" >&2; exit 1; }

	enable_errexit

	readonly OUT_DIR="${TEST_TMPDIR}/out"
	readonly OUT="${OUT_DIR}/outfile"
	readonly ERR="${OUT_DIR}/errfile"
	readonly SANDBOX_DIR="${OUT_DIR}/sandbox"
	readonly MOUNT_TARGET_ROOT="${TEST_TMPDIR}/targets"

	readonly CPU_TIME_SPENDER="${CURRENT_DIR}/../../../test/shell/integration/spend_cpu_time"

	SANDBOX_DEFAULT_OPTS="-W $SANDBOX_DIR"

	function set_up {
	rm -rf $OUT_DIR
	mkdir -p $SANDBOX_DIR
	}

	function test_basic_functionality() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -- /bin/echo hi there &> $TEST_log \|\| fail
	expect_log "hi there"
	}

	function test_execvp_error_message_contains_path() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -- /does/not/exist --hello world &> $TEST_log \|\| code=$?
	expect_log "\"execvp(/does/not/exist, 0x[[:alnum:]]*)\": No such file or directory"
	}

	function test_default_user_is_current_user() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -- /usr/bin/id &> $TEST_log \|\| fail
	local current_uid_number="$(id -u)"
	# Expecting something like: uid=485038(ruperts) ...
	expect_log "uid=${current_uid_number}("
	}

	function test_user_switched_to_root() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -R -- /usr/bin/id &> $TEST_log \|\| fail
	expect_log "uid=0(root) gid=0(root) groups=0(root)"
	}

	function test_user_switched_to_nobody() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -U -- /usr/bin/id &> $TEST_log \|\| fail
	expect_log "uid=[0-9]\+(nobody) gid=[0-9]\+(\(nobody\\|nogroup\)) groups=[0-9]\+(\(nobody\\|nogroup\))"
	}

	function test_exit_code() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -- /bin/bash -c "exit 71" &> $TEST_log \|\| code=$?
	assert_equals 71 "$code"
	}

	function test_signal_death() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -- /bin/bash -c 'kill -ABRT $$' &> $TEST_log \|\| code=$?
	assert_equals 134 "$code" # SIGNAL_BASE + SIGABRT = 128 + 6
	}

	# Tests that even when the child catches SIGTERM and exits with code 0, that the sandbox exits with
	# code 142 (telling us about the expired timeout).
	function test_signal_catcher() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -T 2 -t 3 -- /bin/bash -c \
	'trap "echo later; exit 0" SIGINT SIGTERM SIGALRM; sleep 1000' &> $TEST_log \|\| code=$?
	assert_equals 142 "$code" # SIGNAL_BASE + SIGALRM = 128 + 14
	expect_log "^later$"
	}

	function test_basic_timeout() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -T 3 -t 3 -- /bin/bash -c "echo before; sleep 1000; echo after" &> $TEST_log && fail
	expect_log "^before$" ""
	}

	function test_timeout_grace() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -T 2 -t 3 -- /bin/bash -c \
	'trap "echo -n before; sleep 1; echo -n after; exit 0" SIGINT SIGTERM SIGALRM; sleep 1000' &> $TEST_log \|\| code=$?
	assert_equals 142 "$code" # SIGNAL_BASE + SIGALRM = 128 + 14
	expect_log "^beforeafter$"
	}

	function test_timeout_kill() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -T 2 -t 3 -- /bin/bash -c \
	'trap "echo before; sleep 1000; echo after; exit 0" SIGINT SIGTERM SIGALRM; sleep 1000' &> $TEST_log \|\| code=$?
	assert_equals 142 "$code" # SIGNAL_BASE + SIGALRM = 128 + 14
	expect_log "^before$"
	}

	function test_debug_logging() {
	touch ${TEST_TMPDIR}/testfile
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -D -- /bin/true &> $TEST_log \|\| code=$?
	expect_log "child exited normally with exitcode 0"
	}

	function test_mount_additional_paths_success() {
	mkdir -p ${TEST_TMPDIR}/foo
	mkdir -p ${TEST_TMPDIR}/bar
	touch ${TEST_TMPDIR}/testfile
	mkdir -p ${MOUNT_TARGET_ROOT}/foo
	touch ${MOUNT_TARGET_ROOT}/sandboxed_testfile

	touch /tmp/sandboxed_testfile
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -D \
	-M ${TEST_TMPDIR}/foo -m ${MOUNT_TARGET_ROOT}/foo \
	-M ${TEST_TMPDIR}/bar \
	-M ${TEST_TMPDIR}/testfile -m ${MOUNT_TARGET_ROOT}/sandboxed_testfile \
	-- /bin/true &> $TEST_log \|\| code=$?
	# mount a directory to a customized path inside the sandbox
	expect_log "bind mount: ${TEST_TMPDIR}/foo -> ${MOUNT_TARGET_ROOT}/foo\$"
	# mount a directory to the same path inside the sanxbox
	expect_log "bind mount: ${TEST_TMPDIR}/bar -> ${TEST_TMPDIR}/bar\$"
	# mount a file to a customized path inside the sandbox
	expect_log "bind mount: ${TEST_TMPDIR}/testfile -> ${MOUNT_TARGET_ROOT}/sandboxed_testfile\$"
	expect_log "child exited normally with exitcode 0"
	rm -rf ${MOUNT_TARGET_ROOT}/foo
	rm -rf ${MOUNT_TARGET_ROOT}/sandboxed_testfile
	}

	function test_mount_additional_paths_relative_path() {
	touch ${TEST_TMPDIR}/testfile
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -D \
	-M ${TEST_TMPDIR}/testfile -m tmp/sandboxed_testfile \
	-- /bin/true &> $TEST_log \|\| code=$?
	# mount a directory to a customized path inside the sandbox
	expect_log "The -m option must be used with absolute paths only.\$"
	}

	function test_mount_additional_paths_leading_m() {
	mkdir -p ${TEST_TMPDIR}/foo
	touch ${TEST_TMPDIR}/testfile
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -D \
	-m /tmp/foo \
	-M ${TEST_TMPDIR}/testfile -m /tmp/sandboxed_testfile \
	-- /bin/true &> $TEST_log \|\| code=$?
	# mount a directory to a customized path inside the sandbox
	expect_log "The -m option must be strictly preceded by an -M option.\$"
	}

	function test_mount_additional_paths_m_not_preceeded_by_M() {
	mkdir -p ${TEST_TMPDIR}/foo
	mkdir -p ${TEST_TMPDIR}/bar
	touch ${TEST_TMPDIR}/testfile
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -D \
	-M ${TEST_TMPDIR}/testfile -m /tmp/sandboxed_testfile \
	-m /tmp/foo \
	-M ${TEST_TMPDIR}/bar \
	-- /bin/true &> $TEST_log \|\| code=$?
	# mount a directory to a customized path inside the sandbox
	expect_log "The -m option must be strictly preceded by an -M option.\$"
	}

	function test_mount_additional_paths_other_flag_between_M_m_pair() {
	mkdir -p ${TEST_TMPDIR}/bar
	touch ${TEST_TMPDIR}/testfile
	$linux_sandbox $SANDBOX_DEFAULT_OPTS \
	-M ${TEST_TMPDIR}/testfile -D -m /tmp/sandboxed_testfile \
	-M ${TEST_TMPDIR}/bar \
	-- /bin/true &> $TEST_log \|\| code=$?
	# mount a directory to a customized path inside the sandbox
	expect_log "The -m option must be strictly preceded by an -M option.\$"
	}

	function test_mount_additional_paths_multiple_sources_mount_to_one_target() {
	mkdir -p ${TEST_TMPDIR}/foo
	mkdir -p ${TEST_TMPDIR}/bar
	mkdir -p ${MOUNT_TARGET_ROOT}/foo
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -D \
	-M ${TEST_TMPDIR}/foo -m ${MOUNT_TARGET_ROOT}/foo \
	-M ${TEST_TMPDIR}/bar -m ${MOUNT_TARGET_ROOT}/foo \
	-- /bin/true &> $TEST_log \|\| code=$?
	# mount a directory to a customized path inside the sandbox
	expect_log "bind mount: ${TEST_TMPDIR}/foo -> ${MOUNT_TARGET_ROOT}/foo\$"
	# mount a new source directory to the same target, which will overwrite the previous source path
	expect_log "bind mount: ${TEST_TMPDIR}/bar -> ${MOUNT_TARGET_ROOT}/foo\$"
	expect_log "child exited normally with exitcode 0"
	rm -rf ${MOUNT_TARGET_ROOT}/foo
	}

	function test_redirect_output() {
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -l $OUT -L $ERR -- /bin/bash -c "echo out; echo err >&2" &> $TEST_log \|\| code=$?
	assert_equals "out" "$(cat $OUT)"
	assert_equals "err" "$(cat $ERR)"
	}

	function test_tmp_is_writable() {
	# If /tmp is not writable on the host, it won't be inside the sandbox.
	test -w /tmp \|\| return 0

	$linux_sandbox $SANDBOX_DEFAULT_OPTS -w /tmp -- /bin/bash -c "rm -f $(mktemp --tmpdir=/tmp)" \
	&> $TEST_log \|\| fail
	}

	function test_dev_shm_is_writable() {
	# If /dev/shm is not writable on the host, it won't be inside the sandbox.
	test -w /dev/shm \|\| return 0

	# /dev/shm is often a symlink to /run/shm, thus we use readlink to get the canonical path.
	$linux_sandbox $SANDBOX_DEFAULT_OPTS -w "$(readlink -f /dev/shm)" -- /bin/bash -c "rm -f $(mktemp --tmpdir=/dev/shm)" \
	&> $TEST_log \|\| fail
	}

	function assert_linux_sandbox_exec_time() {
	local user_time_low="$1"; shift
	local user_time_high="$1"; shift
	local sys_time_low="$1"; shift
	local sys_time_high="$1"; shift

	local local_tmp="$(mktemp -d "${OUT_DIR}/assert_linux_sandbox_exec_timeXXXX")"
	local stdout_path="${local_tmp}/stdout"
	local stderr_path="${local_tmp}/stderr"
	local stats_out_path="${local_tmp}/statsfile"
	local stats_out_decoded_path="${local_tmp}/statsfile.decoded"

	cp "${CPU_TIME_SPENDER}" "${SANDBOX_DIR}"
	local cpu_time_spender_sandbox_path="${SANDBOX_DIR}/spend_cpu_time"

	# Sandboxed process will be terminated after 100 seconds if not already dead.
	local code=0
	"${linux_sandbox}" \
	-W "${SANDBOX_DIR}" \
	-T 100 \
	-t 2 \
	-l "${stdout_path}" \
	-L "${stderr_path}" \
	-S "${stats_out_path}" \
	-- \
	"${cpu_time_spender_sandbox_path}" "${user_time_low}" "${sys_time_low}" \
	&> "${TEST_log}" \|\| code="$?"
	sed -e 's,^subprocess stdout: ,,' "${stdout_path}" >>"${TEST_log}"
	sed -e 's,^subprocess stderr: ,,' "${stderr_path}" >>"${TEST_log}"
	assert_equals 0 "${code}"

	assert_execution_time_in_range \
	"${user_time_low}" \
	"${user_time_high}" \
	"${sys_time_low}" \
	"${sys_time_high}" \
	"${stats_out_path}"
	}

	function test_stats_high_user_time() {
	assert_linux_sandbox_exec_time 10 19 0 9
	}

	function test_stats_high_system_time() {
	assert_linux_sandbox_exec_time 0 9 10 19
	}

	function test_stats_high_user_time_and_high_system_time() {
	assert_linux_sandbox_exec_time 10 25 10 25
	}

	# The test shouldn't fail if the environment doesn't support running it.
	check_supported_platform \|\| exit 0
	check_sandbox_allowed \|\| exit 0

	run_suite "linux-sandbox"