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5554304f0d
This patch makes glob match dangling symlinks. Compared to other glob implementation (*BSD, bash, musl, and other shells as well), GLIBC seems the be the only one that does not match dangling symlinks. As for comment #5 in BZ #866, POSIX does not have any strict specification for dangling symlinks match and it is reasonable that trying to glob everything in a path should return all types of files (such as for a 'rm *'). Also, comment #7 shows even more example where GLIBC current behavior is unexepected. I avoided adding another GNU specific flag to set this behavior and instead make it the default. Although this change the semanthic from previous implementation, I think adding another compat symbol to be really unecessary as from aforementioned reasons (current behavior not defined in any standard, general idea of different implementation is to list dangling symbols). This also sync glob with gnulib commit fd1daf4 (glob: match dangling symlinks). Checked on x86_64-linux-gnu and on a build using build-many-glibcs.py for all major architectures. [BZ #866] [BZ #1062] * posix/Makefile (tests): Remove bug-glob1 and tst-glob_symlinks. * posix/bug-glob1.c: Remove file. * posix/tst-glob_symlinks.c: New file. * posix/glob.c (__lstat64): New macro. (is_dir): New function. (glob, glob_in_dir): Match symlinks even if they are dangling. (link_stat, link_exists_p): Remove. All uses removed.
136 lines
4.2 KiB
C
136 lines
4.2 KiB
C
/* Test glob danglin symlink match (BZ #866).
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Copyright (C) 2017 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 <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <limits.h>
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#include <stddef.h>
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#include <glob.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <support/check.h>
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#include <support/temp_file.h>
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static void do_prepare (int argc, char *argv[]);
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#define PREPARE do_prepare
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static int do_test (void);
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#include <support/test-driver.c>
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/* Maximum number of symlink calls for create_link function. */
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#define MAX_CREATE_LINK_TRIES 10
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static void
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create_link (const char *base, const char *fname, char *linkname,
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size_t linknamesize)
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{
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int ntries = 0;
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while (1)
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{
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snprintf (linkname, linknamesize, "%s/%s%02d", test_dir, base,
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ntries);
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if (symlink (fname, linkname) == 0)
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break;
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if (errno != EEXIST)
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FAIL_EXIT1 ("symlink failed: %m");
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if (ntries++ == MAX_CREATE_LINK_TRIES)
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FAIL_EXIT1 ("symlink failed with EEXIST too many times");
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}
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add_temp_file (linkname);
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}
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static char valid_link[PATH_MAX];
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static char dangling_link[PATH_MAX];
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static char dangling_dir[PATH_MAX];
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static void
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do_prepare (int argc, char *argv[])
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{
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char *fname;
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create_temp_file ("tst-glob_symlinks.", &fname);
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/* Create an existing symlink. */
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create_link ("valid-symlink-tst-glob_symlinks", fname, valid_link,
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sizeof valid_link);
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/* Create a dangling symlink to a file. */
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int fd = create_temp_file ("dangling-tst-glob_file", &fname);
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TEST_VERIFY_EXIT (close (fd) == 0);
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/* It throws a warning at process end due 'add_temp_file' trying to
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unlink it again. */
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TEST_VERIFY_EXIT (unlink (fname) == 0);
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create_link ("dangling-symlink-file-tst-glob", fname, dangling_link,
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sizeof dangling_link);
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/* Create a dangling symlink to a directory. */
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char tmpdir[PATH_MAX];
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snprintf (tmpdir, sizeof tmpdir, "%s/dangling-tst-glob_folder.XXXXXX",
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test_dir);
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TEST_VERIFY_EXIT (mkdtemp (tmpdir) != NULL);
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create_link ("dangling-symlink-dir-tst-glob", tmpdir, dangling_dir,
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sizeof dangling_dir);
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TEST_VERIFY_EXIT (rmdir (tmpdir) == 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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char buf[PATH_MAX];
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glob_t gl;
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TEST_VERIFY_EXIT (glob (valid_link, 0, NULL, &gl) == 0);
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TEST_VERIFY_EXIT (gl.gl_pathc == 1);
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TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], valid_link) == 0);
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globfree (&gl);
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TEST_VERIFY_EXIT (glob (dangling_link, 0, NULL, &gl) == 0);
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TEST_VERIFY_EXIT (gl.gl_pathc == 1);
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TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_link) == 0);
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globfree (&gl);
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TEST_VERIFY_EXIT (glob (dangling_dir, 0, NULL, &gl) == 0);
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TEST_VERIFY_EXIT (gl.gl_pathc == 1);
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TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_dir) == 0);
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globfree (&gl);
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snprintf (buf, sizeof buf, "%s", dangling_link);
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buf[strlen(buf) - 1] = '?';
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TEST_VERIFY_EXIT (glob (buf, 0, NULL, &gl) == 0);
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TEST_VERIFY_EXIT (gl.gl_pathc == 1);
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TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_link) == 0);
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globfree (&gl);
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/* glob should handle dangling symbol as normal file, so <file>? should
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return an empty string. */
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snprintf (buf, sizeof buf, "%s?", dangling_link);
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TEST_VERIFY_EXIT (glob (buf, 0, NULL, &gl) != 0);
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globfree (&gl);
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snprintf (buf, sizeof buf, "%s*", dangling_link);
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TEST_VERIFY_EXIT (glob (buf, 0, NULL, &gl) == 0);
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TEST_VERIFY_EXIT (gl.gl_pathc == 1);
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TEST_VERIFY_EXIT (strcmp (gl.gl_pathv[0], dangling_link) == 0);
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globfree (&gl);
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return 0;
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}
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