xref: /openbmc/u-boot/test/py/tests/test_env.py (revision be059e88) 
1# Copyright (c) 2015 Stephen Warren
2# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
3#
4# SPDX-License-Identifier: GPL-2.0
5
6# Test operation of shell commands relating to environment variables.
7
8import pytest
9
10# FIXME: This might be useful for other tests;
11# perhaps refactor it into ConsoleBase or some other state object?
12class StateTestEnv(object):
13    """Container that represents the state of all U-Boot environment variables.
14    This enables quick determination of existant/non-existant variable
15    names.
16    """
17
18    def __init__(self, u_boot_console):
19        """Initialize a new StateTestEnv object.
20
21        Args:
22            u_boot_console: A U-Boot console.
23
24        Returns:
25            Nothing.
26        """
27
28        self.u_boot_console = u_boot_console
29        self.get_env()
30        self.set_var = self.get_non_existent_var()
31
32    def get_env(self):
33        """Read all current environment variables from U-Boot.
34
35        Args:
36            None.
37
38        Returns:
39            Nothing.
40        """
41
42        if self.u_boot_console.config.buildconfig.get(
43                'config_version_variable', 'n') == 'y':
44            with self.u_boot_console.disable_check('main_signon'):
45                response = self.u_boot_console.run_command('printenv')
46        else:
47            response = self.u_boot_console.run_command('printenv')
48        self.env = {}
49        for l in response.splitlines():
50            if not '=' in l:
51                continue
52            (var, value) = l.strip().split('=', 1)
53            self.env[var] = value
54
55    def get_existent_var(self):
56        """Return the name of an environment variable that exists.
57
58        Args:
59            None.
60
61        Returns:
62            The name of an environment variable.
63        """
64
65        for var in self.env:
66            return var
67
68    def get_non_existent_var(self):
69        """Return the name of an environment variable that does not exist.
70
71        Args:
72            None.
73
74        Returns:
75            The name of an environment variable.
76        """
77
78        n = 0
79        while True:
80            var = 'test_env_' + str(n)
81            if var not in self.env:
82                return var
83            n += 1
84
85ste = None
86@pytest.fixture(scope='function')
87def state_test_env(u_boot_console):
88    """pytest fixture to provide a StateTestEnv object to tests."""
89
90    global ste
91    if not ste:
92        ste = StateTestEnv(u_boot_console)
93    return ste
94
95def unset_var(state_test_env, var):
96    """Unset an environment variable.
97
98    This both executes a U-Boot shell command and updates a StateTestEnv
99    object.
100
101    Args:
102        state_test_env: The StateTestEnv object to update.
103        var: The variable name to unset.
104
105    Returns:
106        Nothing.
107    """
108
109    state_test_env.u_boot_console.run_command('setenv %s' % var)
110    if var in state_test_env.env:
111        del state_test_env.env[var]
112
113def set_var(state_test_env, var, value):
114    """Set an environment variable.
115
116    This both executes a U-Boot shell command and updates a StateTestEnv
117    object.
118
119    Args:
120        state_test_env: The StateTestEnv object to update.
121        var: The variable name to set.
122        value: The value to set the variable to.
123
124    Returns:
125        Nothing.
126    """
127
128    state_test_env.u_boot_console.run_command('setenv %s "%s"' % (var, value))
129    state_test_env.env[var] = value
130
131def validate_empty(state_test_env, var):
132    """Validate that a variable is not set, using U-Boot shell commands.
133
134    Args:
135        var: The variable name to test.
136
137    Returns:
138        Nothing.
139    """
140
141    response = state_test_env.u_boot_console.run_command('echo $%s' % var)
142    assert response == ''
143
144def validate_set(state_test_env, var, value):
145    """Validate that a variable is set, using U-Boot shell commands.
146
147    Args:
148        var: The variable name to test.
149        value: The value the variable is expected to have.
150
151    Returns:
152        Nothing.
153    """
154
155    # echo does not preserve leading, internal, or trailing whitespace in the
156    # value. printenv does, and hence allows more complete testing.
157    response = state_test_env.u_boot_console.run_command('printenv %s' % var)
158    assert response == ('%s=%s' % (var, value))
159
160def test_env_echo_exists(state_test_env):
161    """Test echoing a variable that exists."""
162
163    var = state_test_env.get_existent_var()
164    value = state_test_env.env[var]
165    validate_set(state_test_env, var, value)
166
167def test_env_echo_non_existent(state_test_env):
168    """Test echoing a variable that doesn't exist."""
169
170    var = state_test_env.set_var
171    validate_empty(state_test_env, var)
172
173def test_env_printenv_non_existent(state_test_env):
174    """Test printenv error message for non-existant variables."""
175
176    var = state_test_env.set_var
177    c = state_test_env.u_boot_console
178    with c.disable_check('error_notification'):
179        response = c.run_command('printenv %s' % var)
180    assert(response == '## Error: "%s" not defined' % var)
181
182def test_env_unset_non_existent(state_test_env):
183    """Test unsetting a nonexistent variable."""
184
185    var = state_test_env.get_non_existent_var()
186    unset_var(state_test_env, var)
187    validate_empty(state_test_env, var)
188
189def test_env_set_non_existent(state_test_env):
190    """Test set a non-existant variable."""
191
192    var = state_test_env.set_var
193    value = 'foo'
194    set_var(state_test_env, var, value)
195    validate_set(state_test_env, var, value)
196
197def test_env_set_existing(state_test_env):
198    """Test setting an existant variable."""
199
200    var = state_test_env.set_var
201    value = 'bar'
202    set_var(state_test_env, var, value)
203    validate_set(state_test_env, var, value)
204
205def test_env_unset_existing(state_test_env):
206    """Test unsetting a variable."""
207
208    var = state_test_env.set_var
209    unset_var(state_test_env, var)
210    validate_empty(state_test_env, var)
211
212def test_env_expansion_spaces(state_test_env):
213    """Test expanding a variable that contains a space in its value."""
214
215    var_space = None
216    var_test = None
217    try:
218        var_space = state_test_env.get_non_existent_var()
219        set_var(state_test_env, var_space, ' ')
220
221        var_test = state_test_env.get_non_existent_var()
222        value = ' 1${%(var_space)s}${%(var_space)s} 2 ' % locals()
223        set_var(state_test_env, var_test, value)
224        value = ' 1   2 '
225        validate_set(state_test_env, var_test, value)
226    finally:
227        if var_space:
228            unset_var(state_test_env, var_space)
229        if var_test:
230            unset_var(state_test_env, var_test)
231