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# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Stephen Warren
# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
"""
Test operation of shell commands relating to environment variables.
"""
import os
import os.path
from subprocess import call, CalledProcessError
import tempfile
import pytest
import u_boot_utils
# FIXME: This might be useful for other tests;
# perhaps refactor it into ConsoleBase or some other state object?
class StateTestEnv(object):
"""Container that represents the state of all U-Boot environment variables.
This enables quick determination of existant/non-existant variable
names.
"""
def __init__(self, u_boot_console):
"""Initialize a new StateTestEnv object.
Args:
u_boot_console: A U-Boot console.
Returns:
Nothing.
"""
self.u_boot_console = u_boot_console
self.get_env()
self.set_var = self.get_non_existent_var()
def get_env(self):
"""Read all current environment variables from U-Boot.
Args:
None.
Returns:
Nothing.
"""
if self.u_boot_console.config.buildconfig.get(
'config_version_variable', 'n') == 'y':
with self.u_boot_console.disable_check('main_signon'):
response = self.u_boot_console.run_command('printenv')
else:
response = self.u_boot_console.run_command('printenv')
self.env = {}
for l in response.splitlines():
if not '=' in l:
continue
(var, value) = l.split('=', 1)
self.env[var] = value
def get_existent_var(self):
"""Return the name of an environment variable that exists.
Args:
None.
Returns:
The name of an environment variable.
"""
for var in self.env:
return var
def get_non_existent_var(self):
"""Return the name of an environment variable that does not exist.
Args:
None.
Returns:
The name of an environment variable.
"""
n = 0
while True:
var = 'test_env_' + str(n)
if var not in self.env:
return var
n += 1
ste = None
@pytest.fixture(scope='function')
def state_test_env(u_boot_console):
"""pytest fixture to provide a StateTestEnv object to tests."""
global ste
if not ste:
ste = StateTestEnv(u_boot_console)
return ste
def unset_var(state_test_env, var):
"""Unset an environment variable.
This both executes a U-Boot shell command and updates a StateTestEnv
object.
Args:
state_test_env: The StateTestEnv object to update.
var: The variable name to unset.
Returns:
Nothing.
"""
state_test_env.u_boot_console.run_command('setenv %s' % var)
if var in state_test_env.env:
del state_test_env.env[var]
def set_var(state_test_env, var, value):
"""Set an environment variable.
This both executes a U-Boot shell command and updates a StateTestEnv
object.
Args:
state_test_env: The StateTestEnv object to update.
var: The variable name to set.
value: The value to set the variable to.
Returns:
Nothing.
"""
bc = state_test_env.u_boot_console.config.buildconfig
if bc.get('config_hush_parser', None):
quote = '"'
else:
quote = ''
if ' ' in value:
pytest.skip('Space in variable value on non-Hush shell')
state_test_env.u_boot_console.run_command(
'setenv %s %s%s%s' % (var, quote, value, quote))
state_test_env.env[var] = value
def validate_empty(state_test_env, var):
"""Validate that a variable is not set, using U-Boot shell commands.
Args:
var: The variable name to test.
Returns:
Nothing.
"""
response = state_test_env.u_boot_console.run_command('echo ${%s}' % var)
assert response == ''
def validate_set(state_test_env, var, value):
"""Validate that a variable is set, using U-Boot shell commands.
Args:
var: The variable name to test.
value: The value the variable is expected to have.
Returns:
Nothing.
"""
# echo does not preserve leading, internal, or trailing whitespace in the
# value. printenv does, and hence allows more complete testing.
response = state_test_env.u_boot_console.run_command('printenv %s' % var)
assert response == ('%s=%s' % (var, value))
def test_env_echo_exists(state_test_env):
"""Test echoing a variable that exists."""
var = state_test_env.get_existent_var()
value = state_test_env.env[var]
validate_set(state_test_env, var, value)
@pytest.mark.buildconfigspec('cmd_echo')
def test_env_echo_non_existent(state_test_env):
"""Test echoing a variable that doesn't exist."""
var = state_test_env.set_var
validate_empty(state_test_env, var)
def test_env_printenv_non_existent(state_test_env):
"""Test printenv error message for non-existant variables."""
var = state_test_env.set_var
c = state_test_env.u_boot_console
with c.disable_check('error_notification'):
response = c.run_command('printenv %s' % var)
assert response == '## Error: "%s" not defined' % var
@pytest.mark.buildconfigspec('cmd_echo')
def test_env_unset_non_existent(state_test_env):
"""Test unsetting a nonexistent variable."""
var = state_test_env.get_non_existent_var()
unset_var(state_test_env, var)
validate_empty(state_test_env, var)
def test_env_set_non_existent(state_test_env):
"""Test set a non-existant variable."""
var = state_test_env.set_var
value = 'foo'
set_var(state_test_env, var, value)
validate_set(state_test_env, var, value)
def test_env_set_existing(state_test_env):
"""Test setting an existant variable."""
var = state_test_env.set_var
value = 'bar'
set_var(state_test_env, var, value)
validate_set(state_test_env, var, value)
@pytest.mark.buildconfigspec('cmd_echo')
def test_env_unset_existing(state_test_env):
"""Test unsetting a variable."""
var = state_test_env.set_var
unset_var(state_test_env, var)
validate_empty(state_test_env, var)
def test_env_expansion_spaces(state_test_env):
"""Test expanding a variable that contains a space in its value."""
var_space = None
var_test = None
try:
var_space = state_test_env.get_non_existent_var()
set_var(state_test_env, var_space, ' ')
var_test = state_test_env.get_non_existent_var()
value = ' 1${%(var_space)s}${%(var_space)s} 2 ' % locals()
set_var(state_test_env, var_test, value)
value = ' 1 2 '
validate_set(state_test_env, var_test, value)
finally:
if var_space:
unset_var(state_test_env, var_space)
if var_test:
unset_var(state_test_env, var_test)
@pytest.mark.buildconfigspec('cmd_importenv')
def test_env_import_checksum_no_size(state_test_env):
"""Test that omitted ('-') size parameter with checksum validation fails the
env import function.
"""
c = state_test_env.u_boot_console
ram_base = u_boot_utils.find_ram_base(state_test_env.u_boot_console)
addr = '%08x' % ram_base
with c.disable_check('error_notification'):
response = c.run_command('env import -c %s -' % addr)
assert response == '## Error: external checksum format must pass size'
@pytest.mark.buildconfigspec('cmd_importenv')
def test_env_import_whitelist_checksum_no_size(state_test_env):
"""Test that omitted ('-') size parameter with checksum validation fails the
env import function when variables are passed as parameters.
"""
c = state_test_env.u_boot_console
ram_base = u_boot_utils.find_ram_base(state_test_env.u_boot_console)
addr = '%08x' % ram_base
with c.disable_check('error_notification'):
response = c.run_command('env import -c %s - foo1 foo2 foo4' % addr)
assert response == '## Error: external checksum format must pass size'
@pytest.mark.buildconfigspec('cmd_exportenv')
@pytest.mark.buildconfigspec('cmd_importenv')
def test_env_import_whitelist(state_test_env):
"""Test importing only a handful of env variables from an environment."""
c = state_test_env.u_boot_console
ram_base = u_boot_utils.find_ram_base(state_test_env.u_boot_console)
addr = '%08x' % ram_base
set_var(state_test_env, 'foo1', 'bar1')
set_var(state_test_env, 'foo2', 'bar2')
set_var(state_test_env, 'foo3', 'bar3')
c.run_command('env export %s' % addr)
unset_var(state_test_env, 'foo1')
set_var(state_test_env, 'foo2', 'test2')
set_var(state_test_env, 'foo4', 'bar4')
# no foo1 in current env, foo2 overridden, foo3 should be of the value
# before exporting and foo4 should be of the value before importing.
c.run_command('env import %s - foo1 foo2 foo4' % addr)
validate_set(state_test_env, 'foo1', 'bar1')
validate_set(state_test_env, 'foo2', 'bar2')
validate_set(state_test_env, 'foo3', 'bar3')
validate_set(state_test_env, 'foo4', 'bar4')
# Cleanup test environment
unset_var(state_test_env, 'foo1')
unset_var(state_test_env, 'foo2')
unset_var(state_test_env, 'foo3')
unset_var(state_test_env, 'foo4')
@pytest.mark.buildconfigspec('cmd_exportenv')
@pytest.mark.buildconfigspec('cmd_importenv')
def test_env_import_whitelist_delete(state_test_env):
"""Test importing only a handful of env variables from an environment, with.
deletion if a var A that is passed to env import is not in the
environment to be imported.
"""
c = state_test_env.u_boot_console
ram_base = u_boot_utils.find_ram_base(state_test_env.u_boot_console)
addr = '%08x' % ram_base
set_var(state_test_env, 'foo1', 'bar1')
set_var(state_test_env, 'foo2', 'bar2')
set_var(state_test_env, 'foo3', 'bar3')
c.run_command('env export %s' % addr)
unset_var(state_test_env, 'foo1')
set_var(state_test_env, 'foo2', 'test2')
set_var(state_test_env, 'foo4', 'bar4')
# no foo1 in current env, foo2 overridden, foo3 should be of the value
# before exporting and foo4 should be empty.
c.run_command('env import -d %s - foo1 foo2 foo4' % addr)
validate_set(state_test_env, 'foo1', 'bar1')
validate_set(state_test_env, 'foo2', 'bar2')
validate_set(state_test_env, 'foo3', 'bar3')
validate_empty(state_test_env, 'foo4')
# Cleanup test environment
unset_var(state_test_env, 'foo1')
unset_var(state_test_env, 'foo2')
unset_var(state_test_env, 'foo3')
unset_var(state_test_env, 'foo4')
@pytest.mark.buildconfigspec('cmd_nvedit_info')
def test_env_info(state_test_env):
"""Test 'env info' command with all possible options.
"""
c = state_test_env.u_boot_console
response = c.run_command('env info')
nb_line = 0
for l in response.split('\n'):
if 'env_valid = ' in l:
assert '= invalid' in l or '= valid' in l or '= redundant' in l
nb_line += 1
elif 'env_ready =' in l or 'env_use_default =' in l:
assert '= true' in l or '= false' in l
nb_line += 1
else:
assert True
assert nb_line == 3
response = c.run_command('env info -p -d')
assert 'Default environment is used' in response or \
"Environment was loaded from persistent storage" in response
assert 'Environment can be persisted' in response or \
"Environment cannot be persisted" in response
response = c.run_command('env info -p -d -q')
assert response == ""
response = c.run_command('env info -p -q')
assert response == ""
response = c.run_command('env info -d -q')
assert response == ""
@pytest.mark.boardspec('sandbox')
@pytest.mark.buildconfigspec('cmd_nvedit_info')
@pytest.mark.buildconfigspec('cmd_echo')
def test_env_info_sandbox(state_test_env):
"""Test 'env info' command result with several options on sandbox
with a known ENV configuration: ready & default & persistent
"""
c = state_test_env.u_boot_console
response = c.run_command('env info')
assert 'env_ready = true' in response
assert 'env_use_default = true' in response
response = c.run_command('env info -p -d')
assert 'Default environment is used' in response
assert 'Environment cannot be persisted' in response
response = c.run_command('env info -d -q')
response = c.run_command('echo $?')
assert response == "0"
response = c.run_command('env info -p -q')
response = c.run_command('echo $?')
assert response == "1"
response = c.run_command('env info -d -p -q')
response = c.run_command('echo $?')
assert response == "1"
def mk_env_ext4(state_test_env):
"""Create a empty ext4 file system volume."""
c = state_test_env.u_boot_console
filename = 'env.ext4.img'
persistent = c.config.persistent_data_dir + '/' + filename
fs_img = c.config.result_dir + '/' + filename
if os.path.exists(persistent):
c.log.action('Disk image file ' + persistent + ' already exists')
else:
# Some distributions do not add /sbin to the default PATH, where mkfs.ext4 lives
os.environ["PATH"] += os.pathsep + '/sbin'
try:
u_boot_utils.run_and_log(c, 'dd if=/dev/zero of=%s bs=1M count=16' % persistent)
u_boot_utils.run_and_log(c, 'mkfs.ext4 %s' % persistent)
sb_content = u_boot_utils.run_and_log(c, 'tune2fs -l %s' % persistent)
if 'metadata_csum' in sb_content:
u_boot_utils.run_and_log(c, 'tune2fs -O ^metadata_csum %s' % persistent)
except CalledProcessError:
call('rm -f %s' % persistent, shell=True)
raise
u_boot_utils.run_and_log(c, ['cp', '-f', persistent, fs_img])
return fs_img
@pytest.mark.boardspec('sandbox')
@pytest.mark.buildconfigspec('cmd_echo')
@pytest.mark.buildconfigspec('cmd_nvedit_info')
@pytest.mark.buildconfigspec('cmd_nvedit_load')
@pytest.mark.buildconfigspec('cmd_nvedit_select')
@pytest.mark.buildconfigspec('env_is_in_ext4')
def test_env_ext4(state_test_env):
"""Test ENV in EXT4 on sandbox."""
c = state_test_env.u_boot_console
fs_img = ''
try:
fs_img = mk_env_ext4(state_test_env)
c.run_command('host bind 0 %s' % fs_img)
response = c.run_command('ext4ls host 0:0')
assert 'uboot.env' not in response
# force env location: EXT4 (prio 1 in sandbox)
response = c.run_command('env select EXT4')
assert 'Select Environment on EXT4: OK' in response
response = c.run_command('env save')
assert 'Saving Environment to EXT4' in response
response = c.run_command('env load')
assert 'Loading Environment from EXT4... OK' in response
response = c.run_command('ext4ls host 0:0')
assert '8192 uboot.env' in response
response = c.run_command('env info')
assert 'env_valid = valid' in response
assert 'env_ready = true' in response
assert 'env_use_default = false' in response
response = c.run_command('env info -p -d')
assert 'Environment was loaded from persistent storage' in response
assert 'Environment can be persisted' in response
response = c.run_command('env info -d -q')
assert response == ""
response = c.run_command('echo $?')
assert response == "1"
response = c.run_command('env info -p -q')
assert response == ""
response = c.run_command('echo $?')
assert response == "0"
response = c.run_command('env erase')
assert 'OK' in response
response = c.run_command('env load')
assert 'Loading Environment from EXT4... ' in response
assert 'bad CRC, using default environment' in response
response = c.run_command('env info')
assert 'env_valid = invalid' in response
assert 'env_ready = true' in response
assert 'env_use_default = true' in response
response = c.run_command('env info -p -d')
assert 'Default environment is used' in response
assert 'Environment can be persisted' in response
# restore env location: NOWHERE (prio 0 in sandbox)
response = c.run_command('env select nowhere')
assert 'Select Environment on nowhere: OK' in response
response = c.run_command('env load')
assert 'Loading Environment from nowhere... OK' in response
response = c.run_command('env info')
assert 'env_valid = invalid' in response
assert 'env_ready = true' in response
assert 'env_use_default = true' in response
response = c.run_command('env info -p -d')
assert 'Default environment is used' in response
assert 'Environment cannot be persisted' in response
finally:
if fs_img:
call('rm -f %s' % fs_img, shell=True)
def test_env_text(u_boot_console):
"""Test the script that converts the environment to a text file"""
def check_script(intext, expect_val):
"""Check a test case
Args:
intext: Text to pass to the script
expect_val: Expected value of the CONFIG_EXTRA_ENV_TEXT string, or
None if we expect it not to be defined
"""
with tempfile.TemporaryDirectory() as path:
fname = os.path.join(path, 'infile')
with open(fname, 'w') as inf:
print(intext, file=inf)
result = u_boot_utils.run_and_log(cons, ['awk', '-f', script, fname])
if expect_val is not None:
expect = '#define CONFIG_EXTRA_ENV_TEXT "%s"\n' % expect_val
assert result == expect
else:
assert result == ''
cons = u_boot_console
script = os.path.join(cons.config.source_dir, 'scripts', 'env2string.awk')
# simple script with a single var
check_script('fred=123', 'fred=123\\0')
# no vars
check_script('', None)
# two vars
check_script('''fred=123
mary=456''', 'fred=123\\0mary=456\\0')
# blank lines
check_script('''fred=123
mary=456
''', 'fred=123\\0mary=456\\0')
# append
check_script('''fred=123
mary=456
fred+= 456''', 'fred=123 456\\0mary=456\\0')
# append from empty
check_script('''fred=
mary=456
fred+= 456''', 'fred= 456\\0mary=456\\0')
# variable with + in it
check_script('fred+mary=123', 'fred+mary=123\\0')
# ignores variables that are empty
check_script('''fred=
fred+=
mary=456''', 'mary=456\\0')
# single-character env name
check_script('''m=123
e=456
m+= 456''', 'e=456\\0m=123 456\\0')
# contains quotes
check_script('''fred="my var"
mary=another"''', 'fred=\\"my var\\"\\0mary=another\\"\\0')
# variable name ending in +
check_script('''fred\\+=my var
fred++= again''', 'fred+=my var again\\0')
# variable name containing +
check_script('''fred+jane=both
fred+jane+=again
mary=456''', 'fred+jane=bothagain\\0mary=456\\0')
# multi-line vars - new vars always start at column 1
check_script('''fred=first
second
\tthird with tab
after blank
confusing=oops
mary=another"''', 'fred=first second third with tab after blank confusing=oops\\0mary=another\\"\\0')
# real-world example
check_script('''ubifs_boot=
env exists bootubipart ||
env set bootubipart UBI;
env exists bootubivol ||
env set bootubivol boot;
if ubi part ${bootubipart} &&
ubifsmount ubi${devnum}:${bootubivol};
then
devtype=ubi;
run scan_dev_for_boot;
fi
''',
'ubifs_boot=env exists bootubipart || env set bootubipart UBI; '
'env exists bootubivol || env set bootubivol boot; '
'if ubi part ${bootubipart} && ubifsmount ubi${devnum}:${bootubivol}; '
'then devtype=ubi; run scan_dev_for_boot; fi\\0')