summaryrefslogtreecommitdiff
path: root/test/py/tests/test_env.py
blob: b7f960c755fe1d3ab581960f3156371be0cc97b8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
# 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.
        """

        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.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 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.
    """

    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)

@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)