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# Copyright (c) 2015 Stephen Warren
# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
#
# SPDX-License-Identifier: GPL-2.0
# Test operation of shell commands relating to environment variables.
import pytest
# 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.
"""
response = self.u_boot_console.run_command('printenv')
self.env = {}
for l in response.splitlines():
if not '=' in l:
continue
(var, value) = l.strip().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 updata.
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 updata.
var: The variable name to set.
value: The value to set the variable to.
Returns:
Nothing.
"""
state_test_env.u_boot_console.run_command('setenv %s "%s"' % (var, value))
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)
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)
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)
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)
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