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
|
/* Test the posix_spawn_file_actions_addchdir_np function.
Copyright (C) 2018-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <array_length.h>
#include <errno.h>
#include <fcntl.h>
#include <spawn.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
#include <unistd.h>
/* Reads the file at PATH, which must consist of exactly one line.
Removes the line terminator at the end of the file. */
static char *
read_one_line (const char *path)
{
FILE *fp = xfopen (path, "r");
char *buffer = NULL;
size_t length = 0;
ssize_t ret = getline (&buffer, &length, fp);
if (ferror (fp))
FAIL_EXIT1 ("getline: %m");
if (ret < 1)
FAIL_EXIT1 ("getline returned %zd", ret);
if (fgetc (fp) != EOF)
FAIL_EXIT1 ("trailing bytes in %s", path);
if (ferror (fp))
FAIL_EXIT1 ("fgetc: %m");
xfclose (fp);
if (buffer[ret - 1] != '\n')
FAIL_EXIT1 ("missing line terminator in %s", path);
buffer[ret - 1] = 0;
return buffer;
}
/* Return the path to the "pwd" program. */
const char *
get_pwd_program (void)
{
const char *const paths[] = { "/bin/pwd", "/usr/bin/pwd" };
for (size_t i = 0; i < array_length (paths); ++i)
if (access (paths[i], X_OK) == 0)
return paths[i];
FAIL_EXIT1 ("cannot find pwd program");
}
/* Adds chdir operations to ACTIONS, using PATH. If DO_FCHDIR, use
the open function and TMPFD to emulate chdir using fchdir. */
static void
add_chdir (posix_spawn_file_actions_t *actions, const char *path,
bool do_fchdir, int tmpfd)
{
if (do_fchdir)
{
TEST_COMPARE (posix_spawn_file_actions_addopen
(actions, tmpfd, path, O_DIRECTORY | O_RDONLY, 0), 0);
TEST_COMPARE (posix_spawn_file_actions_addfchdir_np
(actions, tmpfd), 0);
TEST_COMPARE (posix_spawn_file_actions_addclose (actions, tmpfd), 0);
}
else
TEST_COMPARE (posix_spawn_file_actions_addchdir_np (actions, path), 0);
}
static int
do_test (void)
{
/* Directory for temporary file data. Each subtest uses a numeric
subdirectory. */
char *directory = support_create_temp_directory ("tst-spawn-chdir-");
{
/* Avoid symbolic links, to get more consistent behavior from the
pwd command. */
char *tmp = realpath (directory, NULL);
if (tmp == NULL)
FAIL_EXIT1 ("realpath: %m");
free (directory);
directory = tmp;
}
char *original_cwd = get_current_dir_name ();
if (original_cwd == NULL)
FAIL_EXIT1 ("get_current_dir_name: %m");
int iteration = 0;
for (int do_spawnp = 0; do_spawnp < 2; ++do_spawnp)
for (int do_overwrite = 0; do_overwrite < 2; ++do_overwrite)
for (int do_fchdir = 0; do_fchdir < 2; ++do_fchdir)
{
/* This subtest does not make sense for fchdir. */
if (do_overwrite && do_fchdir)
continue;
++iteration;
if (test_verbose > 0)
printf ("info: iteration=%d do_spawnp=%d do_overwrite=%d"
" do_fchdir=%d\n",
iteration, do_spawnp, do_overwrite, do_fchdir);
/* The "pwd" program runs in this directory. */
char *iteration_directory = xasprintf ("%s/%d", directory, iteration);
add_temp_file (iteration_directory);
xmkdir (iteration_directory, 0777);
/* This file receives output from "pwd". */
char *output_file_path
= xasprintf ("%s/output-file", iteration_directory);
add_temp_file (output_file_path);
/* This subdirectory is used for chdir ordering checks. */
char *subdir_path = xasprintf ("%s/subdir", iteration_directory);
add_temp_file (subdir_path);
xmkdir (subdir_path, 0777);
/* Also used for checking the order of actions. */
char *probe_file_path
= xasprintf ("%s/subdir/probe-file", iteration_directory);
add_temp_file (probe_file_path);
TEST_COMPARE (access (probe_file_path, F_OK), -1);
TEST_COMPARE (errno, ENOENT);
/* This symbolic link is used in a relative path with
posix_spawn. */
char *pwd_symlink_path
= xasprintf ("%s/subdir/pwd-symlink", iteration_directory);
xsymlink (get_pwd_program (), pwd_symlink_path);
add_temp_file (pwd_symlink_path);
posix_spawn_file_actions_t actions;
TEST_COMPARE (posix_spawn_file_actions_init (&actions), 0);
add_chdir (&actions, subdir_path, do_fchdir, 4);
TEST_COMPARE (posix_spawn_file_actions_addopen
(&actions, 3, /* Arbitrary unused descriptor. */
"probe-file",
O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
TEST_COMPARE (posix_spawn_file_actions_addclose (&actions, 3), 0);
/* Run the actual in iteration_directory. */
add_chdir (&actions, "..", do_fchdir, 5);
TEST_COMPARE (posix_spawn_file_actions_addopen
(&actions, STDOUT_FILENO, "output-file",
O_WRONLY | O_CREAT | O_EXCL, 0777), 0);
/* Check that posix_spawn_file_actions_addchdir_np made a copy
of the path. */
if (do_overwrite)
subdir_path[0] = '\0';
char *const argv[] = { (char *) "pwd", NULL };
char *const envp[] = { NULL } ;
pid_t pid;
if (do_spawnp)
TEST_COMPARE (posix_spawnp (&pid, "pwd", &actions,
NULL, argv, envp), 0);
else
TEST_COMPARE (posix_spawn (&pid, "subdir/pwd-symlink", &actions,
NULL, argv, envp), 0);
TEST_VERIFY (pid > 0);
int status;
xwaitpid (pid, &status, 0);
TEST_COMPARE (status, 0);
/* Check that the current directory did not change. */
{
char *cwd = get_current_dir_name ();
if (cwd == NULL)
FAIL_EXIT1 ("get_current_dir_name: %m");
TEST_COMPARE_BLOB (original_cwd, strlen (original_cwd),
cwd, strlen (cwd));
free (cwd);
}
/* Check the output from "pwd". */
{
char *pwd = read_one_line (output_file_path);
TEST_COMPARE_BLOB (iteration_directory, strlen (iteration_directory),
pwd, strlen (pwd));
free (pwd);
}
/* This file must now exist. */
TEST_COMPARE (access (probe_file_path, F_OK), 0);
TEST_COMPARE (posix_spawn_file_actions_destroy (&actions), 0);
free (pwd_symlink_path);
free (probe_file_path);
free (subdir_path);
free (output_file_path);
}
free (directory);
return 0;
}
#include <support/test-driver.c>
|
