219 lines
7.6 KiB
C
219 lines
7.6 KiB
C
/* Test the posix_spawn_file_actions_addchdir_np function.
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Copyright (C) 2018-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <array_length.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <spawn.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/test-driver.h>
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#include <support/xstdio.h>
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#include <support/xunistd.h>
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#include <unistd.h>
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/* Reads the file at PATH, which must consist of exactly one line.
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Removes the line terminator at the end of the file. */
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static char *
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read_one_line (const char *path)
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{
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FILE *fp = xfopen (path, "r");
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char *buffer = NULL;
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size_t length = 0;
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ssize_t ret = getline (&buffer, &length, fp);
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if (ferror (fp))
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FAIL_EXIT1 ("getline: %m");
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if (ret < 1)
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FAIL_EXIT1 ("getline returned %zd", ret);
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if (fgetc (fp) != EOF)
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FAIL_EXIT1 ("trailing bytes in %s", path);
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if (ferror (fp))
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FAIL_EXIT1 ("fgetc: %m");
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xfclose (fp);
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if (buffer[ret - 1] != '\n')
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FAIL_EXIT1 ("missing line terminator in %s", path);
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buffer[ret - 1] = 0;
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return buffer;
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}
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/* Return the path to the "pwd" program. */
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const char *
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get_pwd_program (void)
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{
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const char *const paths[] = { "/bin/pwd", "/usr/bin/pwd" };
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for (size_t i = 0; i < array_length (paths); ++i)
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if (access (paths[i], X_OK) == 0)
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return paths[i];
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FAIL_EXIT1 ("cannot find pwd program");
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}
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/* Adds chdir operations to ACTIONS, using PATH. If DO_FCHDIR, use
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the open function and TMPFD to emulate chdir using fchdir. */
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static void
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add_chdir (posix_spawn_file_actions_t *actions, const char *path,
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bool do_fchdir, int tmpfd)
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{
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if (do_fchdir)
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{
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TEST_COMPARE (posix_spawn_file_actions_addopen
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(actions, tmpfd, path, O_DIRECTORY | O_RDONLY, 0), 0);
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TEST_COMPARE (posix_spawn_file_actions_addfchdir_np
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(actions, tmpfd), 0);
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TEST_COMPARE (posix_spawn_file_actions_addclose (actions, tmpfd), 0);
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}
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else
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TEST_COMPARE (posix_spawn_file_actions_addchdir_np (actions, path), 0);
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}
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static int
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do_test (void)
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{
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/* Directory for temporary file data. Each subtest uses a numeric
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subdirectory. */
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char *directory = support_create_temp_directory ("tst-spawn-chdir-");
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{
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/* Avoid symbolic links, to get more consistent behavior from the
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pwd command. */
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char *tmp = realpath (directory, NULL);
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if (tmp == NULL)
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FAIL_EXIT1 ("realpath: %m");
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free (directory);
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directory = tmp;
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}
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char *original_cwd = get_current_dir_name ();
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if (original_cwd == NULL)
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FAIL_EXIT1 ("get_current_dir_name: %m");
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int iteration = 0;
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for (int do_spawnp = 0; do_spawnp < 2; ++do_spawnp)
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for (int do_overwrite = 0; do_overwrite < 2; ++do_overwrite)
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for (int do_fchdir = 0; do_fchdir < 2; ++do_fchdir)
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{
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/* This subtest does not make sense for fchdir. */
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if (do_overwrite && do_fchdir)
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continue;
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++iteration;
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if (test_verbose > 0)
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printf ("info: iteration=%d do_spawnp=%d do_overwrite=%d"
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" do_fchdir=%d\n",
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iteration, do_spawnp, do_overwrite, do_fchdir);
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/* The "pwd" program runs in this directory. */
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char *iteration_directory = xasprintf ("%s/%d", directory, iteration);
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add_temp_file (iteration_directory);
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xmkdir (iteration_directory, 0777);
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/* This file receives output from "pwd". */
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char *output_file_path
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= xasprintf ("%s/output-file", iteration_directory);
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add_temp_file (output_file_path);
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/* This subdirectory is used for chdir ordering checks. */
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char *subdir_path = xasprintf ("%s/subdir", iteration_directory);
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add_temp_file (subdir_path);
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xmkdir (subdir_path, 0777);
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/* Also used for checking the order of actions. */
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char *probe_file_path
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= xasprintf ("%s/subdir/probe-file", iteration_directory);
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add_temp_file (probe_file_path);
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TEST_COMPARE (access (probe_file_path, F_OK), -1);
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TEST_COMPARE (errno, ENOENT);
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/* This symbolic link is used in a relative path with
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posix_spawn. */
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char *pwd_symlink_path
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= xasprintf ("%s/subdir/pwd-symlink", iteration_directory);
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xsymlink (get_pwd_program (), pwd_symlink_path);
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add_temp_file (pwd_symlink_path);
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posix_spawn_file_actions_t actions;
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TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
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add_chdir (&actions, subdir_path, do_fchdir, 4);
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TEST_COMPARE (posix_spawn_file_actions_addopen
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(&actions, 3, /* Arbitrary unused descriptor. */
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"probe-file",
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O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
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TEST_COMPARE (posix_spawn_file_actions_addclose (&actions, 3), 0);
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/* Run the actual in iteration_directory. */
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add_chdir (&actions, "..", do_fchdir, 5);
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TEST_COMPARE (posix_spawn_file_actions_addopen
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(&actions, STDOUT_FILENO, "output-file",
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O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
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/* Check that posix_spawn_file_actions_addchdir_np made a copy
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of the path. */
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if (do_overwrite)
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subdir_path[0] = '\0';
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char *const argv[] = { (char *) "pwd", NULL };
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char *const envp[] = { NULL } ;
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pid_t pid;
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if (do_spawnp)
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TEST_COMPARE (posix_spawnp (&pid, "pwd", &actions,
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NULL, argv, envp), 0);
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else
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TEST_COMPARE (posix_spawn (&pid, "subdir/pwd-symlink", &actions,
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NULL, argv, envp), 0);
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TEST_VERIFY (pid > 0);
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int status;
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xwaitpid (pid, &status, 0);
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TEST_COMPARE (status, 0);
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/* Check that the current directory did not change. */
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{
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char *cwd = get_current_dir_name ();
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if (cwd == NULL)
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FAIL_EXIT1 ("get_current_dir_name: %m");
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TEST_COMPARE_BLOB (original_cwd, strlen (original_cwd),
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cwd, strlen (cwd));
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free (cwd);
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}
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/* Check the output from "pwd". */
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{
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char *pwd = read_one_line (output_file_path);
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TEST_COMPARE_BLOB (iteration_directory, strlen (iteration_directory),
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pwd, strlen (pwd));
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free (pwd);
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}
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/* This file must now exist. */
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TEST_COMPARE (access (probe_file_path, F_OK), 0);
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TEST_COMPARE (posix_spawn_file_actions_destroy (&actions), 0);
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free (pwd_symlink_path);
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free (probe_file_path);
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free (subdir_path);
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free (output_file_path);
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}
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free (directory);
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return 0;
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}
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#include <support/test-driver.c>
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