205 lines
6.6 KiB
C
205 lines
6.6 KiB
C
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/* Linux implementation for renameat2 function.
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Copyright (C) 2018-2022 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 <array_length.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.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/xunistd.h>
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#include <unistd.h>
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/* Directory with the temporary files. */
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static char *directory;
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static int directory_fd;
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/* Paths within that directory. */
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static char *old_path; /* File is called "old". */
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static char *new_path; /* File is called "new". */
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/* Subdirectory within the directory above. */
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static char *subdirectory;
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int subdirectory_fd;
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/* And a pathname in that directory (called "file"). */
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static char *subdir_path;
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static void
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prepare (int argc, char **argv)
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{
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directory = support_create_temp_directory ("tst-renameat2-");
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directory_fd = xopen (directory, O_RDONLY | O_DIRECTORY, 0);
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old_path = xasprintf ("%s/old", directory);
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add_temp_file (old_path);
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new_path = xasprintf ("%s/new", directory);
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add_temp_file (new_path);
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subdirectory = xasprintf ("%s/subdir", directory);
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xmkdir (subdirectory, 0777);
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add_temp_file (subdirectory);
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subdirectory_fd = xopen (subdirectory, O_RDONLY | O_DIRECTORY, 0);
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subdir_path = xasprintf ("%s/file", subdirectory);
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add_temp_file (subdir_path);
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}
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/* Delete all files, preparing a clean slate for the next test. */
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static void
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delete_all_files (void)
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{
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char *files[] = { old_path, new_path, subdir_path };
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for (size_t i = 0; i < array_length (files); ++i)
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if (unlink (files[i]) != 0 && errno != ENOENT)
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FAIL_EXIT1 ("unlink (\"%s\"): %m", files[i]);
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}
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/* Return true if PATH exists in the file system. */
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static bool
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file_exists (const char *path)
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{
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return access (path, F_OK) == 0;
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}
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/* Check that PATH exists and has size EXPECTED_SIZE. */
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static void
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check_size (const char *path, off64_t expected_size)
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{
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struct stat64 st;
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xstat (path, &st);
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if (st.st_size != expected_size)
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FAIL_EXIT1 ("file \"%s\": expected size %lld, actual size %lld",
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path, (unsigned long long int) expected_size,
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(unsigned long long int) st.st_size);
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}
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/* Rename tests where the target does not exist. */
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static void
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rename_without_existing_target (unsigned int flags)
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{
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delete_all_files ();
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support_write_file_string (old_path, "");
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TEST_COMPARE (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path, flags), 0);
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TEST_VERIFY (!file_exists (old_path));
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TEST_VERIFY (file_exists (new_path));
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delete_all_files ();
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support_write_file_string (old_path, "");
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TEST_COMPARE (renameat2 (directory_fd, "old", AT_FDCWD, new_path, flags), 0);
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TEST_VERIFY (!file_exists (old_path));
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TEST_VERIFY (file_exists (new_path));
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delete_all_files ();
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support_write_file_string (old_path, "");
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TEST_COMPARE (renameat2 (directory_fd, "old", subdirectory_fd, "file", 0),
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0);
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TEST_VERIFY (!file_exists (old_path));
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TEST_VERIFY (file_exists (subdir_path));
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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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/* Tests with zero flags argument. These are expected to succeed
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because this renameat2 variant can be implemented with
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renameat. */
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rename_without_existing_target (0);
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/* renameat2 without flags replaces an existing destination. */
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delete_all_files ();
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support_write_file_string (old_path, "123");
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support_write_file_string (new_path, "1234");
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TEST_COMPARE (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path, 0), 0);
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TEST_VERIFY (!file_exists (old_path));
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check_size (new_path, 3);
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/* Now we need to check for kernel support of renameat2 with
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flags. */
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delete_all_files ();
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support_write_file_string (old_path, "");
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if (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path, RENAME_NOREPLACE)
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!= 0)
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{
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if (errno == EINVAL)
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puts ("warning: no support for renameat2 with flags");
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else
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FAIL_EXIT1 ("renameat2 probe failed: %m");
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}
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else
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{
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/* We have full renameat2 support. */
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rename_without_existing_target (RENAME_NOREPLACE);
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/* Now test RENAME_NOREPLACE with an existing target. */
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delete_all_files ();
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support_write_file_string (old_path, "123");
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support_write_file_string (new_path, "1234");
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TEST_COMPARE (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path,
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RENAME_NOREPLACE), -1);
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TEST_COMPARE (errno, EEXIST);
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check_size (old_path, 3);
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check_size (new_path, 4);
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delete_all_files ();
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support_write_file_string (old_path, "123");
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support_write_file_string (new_path, "1234");
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TEST_COMPARE (renameat2 (directory_fd, "old", AT_FDCWD, new_path,
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RENAME_NOREPLACE), -1);
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TEST_COMPARE (errno, EEXIST);
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check_size (old_path, 3);
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check_size (new_path, 4);
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delete_all_files ();
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support_write_file_string (old_path, "123");
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support_write_file_string (subdir_path, "1234");
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TEST_COMPARE (renameat2 (directory_fd, "old", subdirectory_fd, "file",
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RENAME_NOREPLACE), -1);
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TEST_COMPARE (errno, EEXIST);
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check_size (old_path, 3);
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check_size (subdir_path, 4);
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/* The flag combination of RENAME_NOREPLACE and RENAME_EXCHANGE
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is invalid. */
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TEST_COMPARE (renameat2 (directory_fd, "ignored",
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subdirectory_fd, "ignored",
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RENAME_NOREPLACE | RENAME_EXCHANGE), -1);
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TEST_COMPARE (errno, EINVAL);
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}
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/* Create all the pathnames to avoid warnings from the test
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harness. */
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support_write_file_string (old_path, "");
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support_write_file_string (new_path, "");
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support_write_file_string (subdir_path, "");
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free (directory);
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free (subdirectory);
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free (old_path);
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free (new_path);
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free (subdir_path);
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xclose (directory_fd);
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xclose (subdirectory_fd);
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return 0;
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}
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#define PREPARE prepare
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#include <support/test-driver.c>
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