xref: /openbmc/u-boot/test/py/tests/test_env.py (revision cf0bcd7d) 
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    bc = state_test_env.u_boot_console.config.buildconfig
129    if bc.get('config_hush_parser', None):
130        quote = '"'
131    else:
132        quote = ''
133        if ' ' in value:
134            pytest.skip('Space in variable value on non-Hush shell')
135
136    state_test_env.u_boot_console.run_command(
137        'setenv %s %s%s%s' % (var, quote, value, quote))
138    state_test_env.env[var] = value
139
140def validate_empty(state_test_env, var):
141    """Validate that a variable is not set, using U-Boot shell commands.
142
143    Args:
144        var: The variable name to test.
145
146    Returns:
147        Nothing.
148    """
149
150    response = state_test_env.u_boot_console.run_command('echo $%s' % var)
151    assert response == ''
152
153def validate_set(state_test_env, var, value):
154    """Validate that a variable is set, using U-Boot shell commands.
155
156    Args:
157        var: The variable name to test.
158        value: The value the variable is expected to have.
159
160    Returns:
161        Nothing.
162    """
163
164    # echo does not preserve leading, internal, or trailing whitespace in the
165    # value. printenv does, and hence allows more complete testing.
166    response = state_test_env.u_boot_console.run_command('printenv %s' % var)
167    assert response == ('%s=%s' % (var, value))
168
169def test_env_echo_exists(state_test_env):
170    """Test echoing a variable that exists."""
171
172    var = state_test_env.get_existent_var()
173    value = state_test_env.env[var]
174    validate_set(state_test_env, var, value)
175
176@pytest.mark.buildconfigspec('cmd_echo')
177def test_env_echo_non_existent(state_test_env):
178    """Test echoing a variable that doesn't exist."""
179
180    var = state_test_env.set_var
181    validate_empty(state_test_env, var)
182
183def test_env_printenv_non_existent(state_test_env):
184    """Test printenv error message for non-existant variables."""
185
186    var = state_test_env.set_var
187    c = state_test_env.u_boot_console
188    with c.disable_check('error_notification'):
189        response = c.run_command('printenv %s' % var)
190    assert(response == '## Error: "%s" not defined' % var)
191
192@pytest.mark.buildconfigspec('cmd_echo')
193def test_env_unset_non_existent(state_test_env):
194    """Test unsetting a nonexistent variable."""
195
196    var = state_test_env.get_non_existent_var()
197    unset_var(state_test_env, var)
198    validate_empty(state_test_env, var)
199
200def test_env_set_non_existent(state_test_env):
201    """Test set a non-existant variable."""
202
203    var = state_test_env.set_var
204    value = 'foo'
205    set_var(state_test_env, var, value)
206    validate_set(state_test_env, var, value)
207
208def test_env_set_existing(state_test_env):
209    """Test setting an existant variable."""
210
211    var = state_test_env.set_var
212    value = 'bar'
213    set_var(state_test_env, var, value)
214    validate_set(state_test_env, var, value)
215
216@pytest.mark.buildconfigspec('cmd_echo')
217def test_env_unset_existing(state_test_env):
218    """Test unsetting a variable."""
219
220    var = state_test_env.set_var
221    unset_var(state_test_env, var)
222    validate_empty(state_test_env, var)
223
224def test_env_expansion_spaces(state_test_env):
225    """Test expanding a variable that contains a space in its value."""
226
227    var_space = None
228    var_test = None
229    try:
230        var_space = state_test_env.get_non_existent_var()
231        set_var(state_test_env, var_space, ' ')
232
233        var_test = state_test_env.get_non_existent_var()
234        value = ' 1${%(var_space)s}${%(var_space)s} 2 ' % locals()
235        set_var(state_test_env, var_test, value)
236        value = ' 1   2 '
237        validate_set(state_test_env, var_test, value)
238    finally:
239        if var_space:
240            unset_var(state_test_env, var_space)
241        if var_test:
242            unset_var(state_test_env, var_test)
243