204 lines
7.3 KiB
C
204 lines
7.3 KiB
C
/* Test for <file_change_detection.c>.
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Copyright (C) 2020-2022 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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<https://www.gnu.org/licenses/>. */
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#include <file_change_detection.h>
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#include <array_length.h>
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#include <stdlib.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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static void
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all_same (struct file_change_detection *array, size_t length)
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{
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for (size_t i = 0; i < length; ++i)
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for (size_t j = 0; j < length; ++j)
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{
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if (test_verbose > 0)
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printf ("info: comparing %zu and %zu\n", i, j);
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TEST_VERIFY (__file_is_unchanged (array + i, array + j));
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}
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}
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static void
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all_different (struct file_change_detection *array, size_t length)
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{
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for (size_t i = 0; i < length; ++i)
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for (size_t j = 0; j < length; ++j)
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{
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if (i == j)
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continue;
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if (test_verbose > 0)
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printf ("info: comparing %zu and %zu\n", i, j);
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TEST_VERIFY (!__file_is_unchanged (array + i, array + j));
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}
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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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/* Use a temporary directory with various paths. */
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char *tempdir = support_create_temp_directory ("tst-file_change_detection-");
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char *path_dangling = xasprintf ("%s/dangling", tempdir);
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char *path_does_not_exist = xasprintf ("%s/does-not-exist", tempdir);
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char *path_empty1 = xasprintf ("%s/empty1", tempdir);
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char *path_empty2 = xasprintf ("%s/empty2", tempdir);
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char *path_fifo = xasprintf ("%s/fifo", tempdir);
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char *path_file1 = xasprintf ("%s/file1", tempdir);
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char *path_file2 = xasprintf ("%s/file2", tempdir);
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char *path_loop = xasprintf ("%s/loop", tempdir);
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char *path_to_empty1 = xasprintf ("%s/to-empty1", tempdir);
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char *path_to_file1 = xasprintf ("%s/to-file1", tempdir);
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add_temp_file (path_dangling);
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add_temp_file (path_empty1);
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add_temp_file (path_empty2);
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add_temp_file (path_fifo);
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add_temp_file (path_file1);
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add_temp_file (path_file2);
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add_temp_file (path_loop);
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add_temp_file (path_to_empty1);
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add_temp_file (path_to_file1);
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xsymlink ("target-does-not-exist", path_dangling);
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support_write_file_string (path_empty1, "");
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support_write_file_string (path_empty2, "");
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TEST_COMPARE (mknod (path_fifo, 0777 | S_IFIFO, 0), 0);
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support_write_file_string (path_file1, "line\n");
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support_write_file_string (path_file2, "line\n");
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xsymlink ("loop", path_loop);
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xsymlink ("empty1", path_to_empty1);
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xsymlink ("file1", path_to_file1);
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FILE *fp_file1 = xfopen (path_file1, "r");
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FILE *fp_file2 = xfopen (path_file2, "r");
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FILE *fp_empty1 = xfopen (path_empty1, "r");
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FILE *fp_empty2 = xfopen (path_empty2, "r");
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/* Test for the same (empty) files. */
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{
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struct file_change_detection fcd[10];
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int i = 0;
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/* Two empty files always have the same contents. */
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_empty1));
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_empty2));
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/* So does a missing file (which is treated as empty). */
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++],
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path_does_not_exist));
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/* And a symbolic link loop. */
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_loop));
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/* And a dangling symbolic link. */
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_dangling));
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/* And a directory. */
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], tempdir));
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/* And a symbolic link to an empty file. */
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_to_empty1));
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/* Likewise for access the file via a FILE *. */
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TEST_VERIFY (__file_change_detection_for_fp (&fcd[i++], fp_empty1));
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TEST_VERIFY (__file_change_detection_for_fp (&fcd[i++], fp_empty2));
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/* And a NULL FILE * (missing file). */
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TEST_VERIFY (__file_change_detection_for_fp (&fcd[i++], NULL));
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TEST_COMPARE (i, array_length (fcd));
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all_same (fcd, array_length (fcd));
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}
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/* Symbolic links are resolved. */
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{
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struct file_change_detection fcd[3];
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int i = 0;
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_file1));
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_to_file1));
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TEST_VERIFY (__file_change_detection_for_fp (&fcd[i++], fp_file1));
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TEST_COMPARE (i, array_length (fcd));
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all_same (fcd, array_length (fcd));
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}
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/* Test for different files. */
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{
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struct file_change_detection fcd[5];
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int i = 0;
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/* The other files are not empty. */
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_empty1));
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/* These two files have the same contents, but have different file
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identity. */
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_file1));
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_file2));
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/* FIFOs are always different, even with themselves. */
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_fifo));
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TEST_VERIFY (__file_change_detection_for_path (&fcd[i++], path_fifo));
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TEST_COMPARE (i, array_length (fcd));
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all_different (fcd, array_length (fcd));
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/* Replacing the file with its symbolic link does not make a
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difference. */
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TEST_VERIFY (__file_change_detection_for_path (&fcd[1], path_to_file1));
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all_different (fcd, array_length (fcd));
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}
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/* Wait for a file change. Depending on file system time stamp
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resolution, this subtest blocks for a while. */
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for (int use_stdio = 0; use_stdio < 2; ++use_stdio)
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{
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struct file_change_detection initial;
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TEST_VERIFY (__file_change_detection_for_path (&initial, path_file1));
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while (true)
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{
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support_write_file_string (path_file1, "line\n");
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struct file_change_detection current;
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if (use_stdio)
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TEST_VERIFY (__file_change_detection_for_fp (¤t, fp_file1));
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else
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TEST_VERIFY (__file_change_detection_for_path
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(¤t, path_file1));
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if (!__file_is_unchanged (&initial, ¤t))
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break;
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/* Wait for a bit to reduce system load. */
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usleep (100 * 1000);
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}
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}
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fclose (fp_empty1);
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fclose (fp_empty2);
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fclose (fp_file1);
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fclose (fp_file2);
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free (path_dangling);
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free (path_does_not_exist);
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free (path_empty1);
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free (path_empty2);
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free (path_fifo);
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free (path_file1);
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free (path_file2);
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free (path_loop);
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free (path_to_empty1);
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free (path_to_file1);
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free (tempdir);
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return 0;
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}
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#include <support/test-driver.c>
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