gdb/unittests/environ-selftests.c

   1 /* Self tests for gdb_environ for GDB, the GNU debugger.
   2
   3    Copyright (C) 2017-2022 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdbsupport/selftest.h"
  22 #include "gdbsupport/environ.h"
  23 #include "diagnostics.h"
  24
  25 static const char gdb_selftest_env_var[] = "GDB_SELFTEST_ENVIRON";
  26
  27 static bool
  28 set_contains (const std::set<std::string> &set, std::string key)
  29 {
  30   return set.find (key) != set.end ();
  31 }
  32
  33 namespace selftests {
  34 namespace gdb_environ_tests {
  35
  36 /* Test if the vector is initialized in a correct way.  */
  37
  38 static void
  39 test_vector_initialization ()
  40 {
  41   gdb_environ env;
  42
  43   /* When the vector is initialized, there should always be one NULL
  44      element in it.  */
  45   SELF_CHECK (env.envp ()[0] == NULL);
  46   SELF_CHECK (env.user_set_env ().size () == 0);
  47   SELF_CHECK (env.user_unset_env ().size () == 0);
  48
  49   /* Make sure that there is no other element.  */
  50   SELF_CHECK (env.get ("PWD") == NULL);
  51 }
  52
  53 /* Test initialization using the host's environ.  */
  54
  55 static void
  56 test_init_from_host_environ ()
  57 {
  58   /* Initialize the environment vector using the host's environ.  */
  59   gdb_environ env = gdb_environ::from_host_environ ();
  60
  61   /* The user-set and user-unset lists must be empty.  */
  62   SELF_CHECK (env.user_set_env ().size () == 0);
  63   SELF_CHECK (env.user_unset_env ().size () == 0);
  64
  65   /* Our test environment variable should be present at the
  66      vector.  */
  67   SELF_CHECK (strcmp (env.get (gdb_selftest_env_var), "1") == 0);
  68 }
  69
  70 /* Test reinitialization using the host's environ.  */
  71
  72 static void
  73 test_reinit_from_host_environ ()
  74 {
  75   /* Reinitialize our environ vector using the host environ.  We
  76      should be able to see one (and only one) instance of the test
  77      variable.  */
  78   gdb_environ env = gdb_environ::from_host_environ ();
  79   env = gdb_environ::from_host_environ ();
  80   char **envp = env.envp ();
  81   int num_found = 0;
  82
  83   for (size_t i = 0; envp[i] != NULL; ++i)
  84     if (strcmp (envp[i], "GDB_SELFTEST_ENVIRON=1") == 0)
  85       ++num_found;
  86   SELF_CHECK (num_found == 1);
  87 }
  88
  89 /* Test the case when we set a variable A, then set a variable B,
  90    then unset A, and make sure that we cannot find A in the environ
  91    vector, but can still find B.  */
  92
  93 static void
  94 test_set_A_unset_B_unset_A_cannot_find_A_can_find_B ()
  95 {
  96   gdb_environ env;
  97
  98   env.set ("GDB_SELFTEST_ENVIRON_1", "aaa");
  99   SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON_1"), "aaa") == 0);
 100   /* User-set environ var list must contain one element.  */
 101   SELF_CHECK (env.user_set_env ().size () == 1);
 102   SELF_CHECK (set_contains (env.user_set_env (),
 103                             std::string ("GDB_SELFTEST_ENVIRON_1=aaa")));
 104
 105   env.set ("GDB_SELFTEST_ENVIRON_2", "bbb");
 106   SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON_2"), "bbb") == 0);
 107
 108   env.unset ("GDB_SELFTEST_ENVIRON_1");
 109   SELF_CHECK (env.get ("GDB_SELFTEST_ENVIRON_1") == NULL);
 110   SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON_2"), "bbb") == 0);
 111
 112   /* The user-set environ var list must contain only one element
 113      now.  */
 114   SELF_CHECK (set_contains (env.user_set_env (),
 115                             std::string ("GDB_SELFTEST_ENVIRON_2=bbb")));
 116   SELF_CHECK (env.user_set_env ().size () == 1);
 117 }
 118
 119 /* Check if unset followed by a set in an empty vector works.  */
 120
 121 static void
 122 test_unset_set_empty_vector ()
 123 {
 124   gdb_environ env;
 125
 126   env.set ("PWD", "test");
 127   SELF_CHECK (strcmp (env.get ("PWD"), "test") == 0);
 128   SELF_CHECK (set_contains (env.user_set_env (), std::string ("PWD=test")));
 129   SELF_CHECK (env.user_unset_env ().size () == 0);
 130   /* The second element must be NULL.  */
 131   SELF_CHECK (env.envp ()[1] == NULL);
 132   SELF_CHECK (env.user_set_env ().size () == 1);
 133   env.unset ("PWD");
 134   SELF_CHECK (env.envp ()[0] == NULL);
 135   SELF_CHECK (env.user_set_env ().size () == 0);
 136   SELF_CHECK (env.user_unset_env ().size () == 1);
 137   SELF_CHECK (set_contains (env.user_unset_env (), std::string ("PWD")));
 138 }
 139
 140 /* When we clear our environ vector, there should be only one
 141    element on it (NULL), and we shouldn't be able to get our test
 142    variable.  */
 143
 144 static void
 145 test_vector_clear ()
 146 {
 147   gdb_environ env;
 148
 149   env.set (gdb_selftest_env_var, "1");
 150
 151   env.clear ();
 152   SELF_CHECK (env.envp ()[0] == NULL);
 153   SELF_CHECK (env.user_set_env ().size () == 0);
 154   SELF_CHECK (env.user_unset_env ().size () == 0);
 155   SELF_CHECK (env.get (gdb_selftest_env_var) == NULL);
 156 }
 157
 158 /* Test that after a std::move the moved-from object is left at a
 159    valid state (i.e., its only element is NULL).  */
 160
 161 static void
 162 test_std_move ()
 163 {
 164   gdb_environ env;
 165   gdb_environ env2;
 166
 167   env.set ("A", "1");
 168   SELF_CHECK (strcmp (env.get ("A"), "1") == 0);
 169   SELF_CHECK (set_contains (env.user_set_env (), std::string ("A=1")));
 170   SELF_CHECK (env.user_set_env ().size () == 1);
 171
 172   env2 = std::move (env);
 173   SELF_CHECK (env.envp ()[0] == NULL);
 174   SELF_CHECK (strcmp (env2.get ("A"), "1") == 0);
 175   SELF_CHECK (env2.envp ()[1] == NULL);
 176   SELF_CHECK (env.user_set_env ().size () == 0);
 177   SELF_CHECK (set_contains (env2.user_set_env (), std::string ("A=1")));
 178   SELF_CHECK (env2.user_set_env ().size () == 1);
 179   env.set ("B", "2");
 180   SELF_CHECK (strcmp (env.get ("B"), "2") == 0);
 181   SELF_CHECK (env.envp ()[1] == NULL);
 182 }
 183
 184 /* Test that the move constructor leaves everything at a valid
 185    state.  */
 186
 187 static void
 188 test_move_constructor ()
 189 {
 190   gdb_environ env;
 191
 192   env.set ("A", "1");
 193   SELF_CHECK (strcmp (env.get ("A"), "1") == 0);
 194   SELF_CHECK (set_contains (env.user_set_env (), std::string ("A=1")));
 195
 196   gdb_environ env2 = std::move (env);
 197   SELF_CHECK (env.envp ()[0] == NULL);
 198   SELF_CHECK (env.user_set_env ().size () == 0);
 199   SELF_CHECK (strcmp (env2.get ("A"), "1") == 0);
 200   SELF_CHECK (env2.envp ()[1] == NULL);
 201   SELF_CHECK (set_contains (env2.user_set_env (), std::string ("A=1")));
 202   SELF_CHECK (env2.user_set_env ().size () == 1);
 203
 204   env.set ("B", "2");
 205   SELF_CHECK (strcmp (env.get ("B"), "2") == 0);
 206   SELF_CHECK (env.envp ()[1] == NULL);
 207   SELF_CHECK (set_contains (env.user_set_env (), std::string ("B=2")));
 208   SELF_CHECK (env.user_set_env ().size () == 1);
 209 }
 210
 211 /* Test that self-moving works.  */
 212
 213 static void
 214 test_self_move ()
 215 {
 216   gdb_environ env;
 217
 218   /* Test self-move.  */
 219   env.set ("A", "1");
 220   SELF_CHECK (strcmp (env.get ("A"), "1") == 0);
 221   SELF_CHECK (set_contains (env.user_set_env (), std::string ("A=1")));
 222   SELF_CHECK (env.user_set_env ().size () == 1);
 223
 224   /* Some compilers warn about moving to self, but that's precisely what we want
 225      to test here, so turn this warning off.  */
 226   DIAGNOSTIC_PUSH
 227   DIAGNOSTIC_IGNORE_SELF_MOVE
 228   env = std::move (env);
 229   DIAGNOSTIC_POP
 230
 231   SELF_CHECK (strcmp (env.get ("A"), "1") == 0);
 232   SELF_CHECK (strcmp (env.envp ()[0], "A=1") == 0);
 233   SELF_CHECK (env.envp ()[1] == NULL);
 234   SELF_CHECK (set_contains (env.user_set_env (), std::string ("A=1")));
 235   SELF_CHECK (env.user_set_env ().size () == 1);
 236 }
 237
 238 /* Test if set/unset/reset works.  */
 239
 240 static void
 241 test_set_unset_reset ()
 242 {
 243   gdb_environ env = gdb_environ::from_host_environ ();
 244
 245   /* Our test variable should already be present in the host's environment.  */
 246   SELF_CHECK (env.get ("GDB_SELFTEST_ENVIRON") != NULL);
 247
 248   /* Set our test variable to another value.  */
 249   env.set ("GDB_SELFTEST_ENVIRON", "test");
 250   SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON"), "test") == 0);
 251   SELF_CHECK (env.user_set_env ().size () == 1);
 252   SELF_CHECK (env.user_unset_env ().size () == 0);
 253
 254   /* And unset our test variable.  The variable still exists in the
 255      host's environment, but doesn't exist in our vector.  */
 256   env.unset ("GDB_SELFTEST_ENVIRON");
 257   SELF_CHECK (env.get ("GDB_SELFTEST_ENVIRON") == NULL);
 258   SELF_CHECK (env.user_set_env ().size () == 0);
 259   SELF_CHECK (env.user_unset_env ().size () == 1);
 260   SELF_CHECK (set_contains (env.user_unset_env (),
 261                             std::string ("GDB_SELFTEST_ENVIRON")));
 262
 263   /* Re-set the test variable.  */
 264   env.set ("GDB_SELFTEST_ENVIRON", "1");
 265   SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON"), "1") == 0);
 266 }
 267
 268 static void
 269 run_tests ()
 270 {
 271   /* Set a test environment variable.  */
 272   if (setenv ("GDB_SELFTEST_ENVIRON", "1", 1) != 0)
 273     error (_("Could not set environment variable for testing."));
 274
 275   test_vector_initialization ();
 276
 277   test_unset_set_empty_vector ();
 278
 279   test_init_from_host_environ ();
 280
 281   test_set_unset_reset ();
 282
 283   test_vector_clear ();
 284
 285   test_reinit_from_host_environ ();
 286
 287   /* Get rid of our test variable.  We won't need it anymore.  */
 288   unsetenv ("GDB_SELFTEST_ENVIRON");
 289
 290   test_set_A_unset_B_unset_A_cannot_find_A_can_find_B ();
 291
 292   test_std_move ();
 293
 294   test_move_constructor ();
 295
 296   test_self_move ();
 297 }
 298 } /* namespace gdb_environ */
 299 } /* namespace selftests */
 300
 301 void _initialize_environ_selftests ();
 302 void
 303 _initialize_environ_selftests ()
 304 {
 305   selftests::register_test ("gdb_environ",
 306                             selftests::gdb_environ_tests::run_tests);
 307 }