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1 | /* Test for <file_change_detection.c>. | |
2 | Copyright (C) 2020-2024 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <file_change_detection.h> | |
20 | ||
21 | #include <array_length.h> | |
22 | #include <stdlib.h> | |
23 | #include <support/check.h> | |
24 | #include <support/support.h> | |
25 | #include <support/temp_file.h> | |
26 | #include <support/test-driver.h> | |
27 | #include <support/xstdio.h> | |
28 | #include <support/xunistd.h> | |
29 | #include <unistd.h> | |
30 | ||
31 | static void | |
32 | all_same (struct file_change_detection *array, size_t length) | |
33 | { | |
34 | for (size_t i = 0; i < length; ++i) | |
35 | for (size_t j = 0; j < length; ++j) | |
36 | { | |
37 | if (test_verbose > 0) | |
38 | printf ("info: comparing %zu and %zu\n", i, j); | |
39 | TEST_VERIFY (__file_is_unchanged (array + i, array + j)); | |
40 | } | |
41 | } | |
42 | ||
43 | static void | |
44 | all_different (struct file_change_detection *array, size_t length) | |
45 | { | |
46 | for (size_t i = 0; i < length; ++i) | |
47 | for (size_t j = 0; j < length; ++j) | |
48 | { | |
49 | if (i == j) | |
50 | continue; | |
51 | if (test_verbose > 0) | |
52 | printf ("info: comparing %zu and %zu\n", i, j); | |
53 | TEST_VERIFY (!__file_is_unchanged (array + i, array + j)); | |
54 | } | |
55 | } | |
56 | ||
57 | static int | |
58 | do_test (void) | |
59 | { | |
60 | /* Use a temporary directory with various paths. */ | |
61 | char *tempdir = support_create_temp_directory ("tst-file_change_detection-"); | |
62 | ||
63 | char *path_dangling = xasprintf ("%s/dangling", tempdir); | |
64 | char *path_does_not_exist = xasprintf ("%s/does-not-exist", tempdir); | |
65 | char *path_empty1 = xasprintf ("%s/empty1", tempdir); | |
66 | char *path_empty2 = xasprintf ("%s/empty2", tempdir); | |
67 | char *path_fifo = xasprintf ("%s/fifo", tempdir); | |
68 | char *path_file1 = xasprintf ("%s/file1", tempdir); | |
69 | char *path_file2 = xasprintf ("%s/file2", tempdir); | |
70 | char *path_loop = xasprintf ("%s/loop", tempdir); | |
71 | char *path_to_empty1 = xasprintf ("%s/to-empty1", tempdir); | |
72 | char *path_to_file1 = xasprintf ("%s/to-file1", tempdir); | |
73 | ||
74 | add_temp_file (path_dangling); | |
75 | add_temp_file (path_empty1); | |
76 | add_temp_file (path_empty2); | |
77 | add_temp_file (path_fifo); | |
78 | add_temp_file (path_file1); | |
79 | add_temp_file (path_file2); | |
80 | add_temp_file (path_loop); | |
81 | add_temp_file (path_to_empty1); | |
82 | add_temp_file (path_to_file1); | |
83 | ||
84 | xsymlink ("target-does-not-exist", path_dangling); | |
85 | support_write_file_string (path_empty1, ""); | |
86 | support_write_file_string (path_empty2, ""); | |
87 | TEST_COMPARE (mknod (path_fifo, 0777 | S_IFIFO, 0), 0); | |
88 | support_write_file_string (path_file1, "line\n"); | |
89 | support_write_file_string (path_file2, "line\n"); | |
90 | xsymlink ("loop", path_loop); | |
91 | xsymlink ("empty1", path_to_empty1); | |
92 | xsymlink ("file1", path_to_file1); | |
93 | ||
94 | FILE *fp_file1 = xfopen (path_file1, "r"); | |
95 | FILE *fp_file2 = xfopen (path_file2, "r"); | |
96 | FILE *fp_empty1 = xfopen (path_empty1, "r"); | |
97 | FILE *fp_empty2 = xfopen (path_empty2, "r"); | |
98 | ||
99 | /* Test for the same (empty) files. */ | |
100 | { | |
101 | struct file_change_detection fcd[10]; | |
102 | int i = 0; | |
103 | /* Two empty files always have the same contents. */ | |
104 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_empty1)); | |
105 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_empty2)); | |
106 | /* So does a missing file (which is treated as empty). */ | |
107 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], | |
108 | path_does_not_exist)); | |
109 | /* And a symbolic link loop. */ | |
110 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_loop)); | |
111 | /* And a dangling symbolic link. */ | |
112 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_dangling)); | |
113 | /* And a directory. */ | |
114 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], tempdir)); | |
115 | /* And a symbolic link to an empty file. */ | |
116 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_to_empty1)); | |
117 | /* Likewise for access the file via a FILE *. */ | |
118 | TEST_VERIFY (__file_change_detection_for_fp (&fcd[i++], fp_empty1)); | |
119 | TEST_VERIFY (__file_change_detection_for_fp (&fcd[i++], fp_empty2)); | |
120 | /* And a NULL FILE * (missing file). */ | |
121 | TEST_VERIFY (__file_change_detection_for_fp (&fcd[i++], NULL)); | |
122 | TEST_COMPARE (i, array_length (fcd)); | |
123 | ||
124 | all_same (fcd, array_length (fcd)); | |
125 | } | |
126 | ||
127 | /* Symbolic links are resolved. */ | |
128 | { | |
129 | struct file_change_detection fcd[3]; | |
130 | int i = 0; | |
131 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_file1)); | |
132 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_to_file1)); | |
133 | TEST_VERIFY (__file_change_detection_for_fp (&fcd[i++], fp_file1)); | |
134 | TEST_COMPARE (i, array_length (fcd)); | |
135 | all_same (fcd, array_length (fcd)); | |
136 | } | |
137 | ||
138 | /* Test for different files. */ | |
139 | { | |
140 | struct file_change_detection fcd[5]; | |
141 | int i = 0; | |
142 | /* The other files are not empty. */ | |
143 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_empty1)); | |
144 | /* These two files have the same contents, but have different file | |
145 | identity. */ | |
146 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_file1)); | |
147 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_file2)); | |
148 | /* FIFOs are always different, even with themselves. */ | |
149 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_fifo)); | |
150 | TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_fifo)); | |
151 | TEST_COMPARE (i, array_length (fcd)); | |
152 | all_different (fcd, array_length (fcd)); | |
153 | ||
154 | /* Replacing the file with its symbolic link does not make a | |
155 | difference. */ | |
156 | TEST_VERIFY (__file_change_detection_for_path (&fcd[1], path_to_file1)); | |
157 | all_different (fcd, array_length (fcd)); | |
158 | } | |
159 | ||
160 | /* Wait for a file change. Depending on file system time stamp | |
161 | resolution, this subtest blocks for a while. */ | |
162 | for (int use_stdio = 0; use_stdio < 2; ++use_stdio) | |
163 | { | |
164 | struct file_change_detection initial; | |
165 | TEST_VERIFY (__file_change_detection_for_path (&initial, path_file1)); | |
166 | while (true) | |
167 | { | |
168 | support_write_file_string (path_file1, "line\n"); | |
169 | struct file_change_detection current; | |
170 | if (use_stdio) | |
171 | TEST_VERIFY (__file_change_detection_for_fp (¤t, fp_file1)); | |
172 | else | |
173 | TEST_VERIFY (__file_change_detection_for_path | |
174 | (¤t, path_file1)); | |
175 | if (!__file_is_unchanged (&initial, ¤t)) | |
176 | break; | |
177 | /* Wait for a bit to reduce system load. */ | |
178 | usleep (100 * 1000); | |
179 | } | |
180 | } | |
181 | ||
182 | fclose (fp_empty1); | |
183 | fclose (fp_empty2); | |
184 | fclose (fp_file1); | |
185 | fclose (fp_file2); | |
186 | ||
187 | free (path_dangling); | |
188 | free (path_does_not_exist); | |
189 | free (path_empty1); | |
190 | free (path_empty2); | |
191 | free (path_fifo); | |
192 | free (path_file1); | |
193 | free (path_file2); | |
194 | free (path_loop); | |
195 | free (path_to_empty1); | |
196 | free (path_to_file1); | |
197 | ||
198 | free (tempdir); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | #include <support/test-driver.c> |