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/* Work around a bug of lstat on some systems
Copyright (C) 1997-2006, 2008-2010 Free Software Foundation, Inc.
Copyright (c) 2013, 2015 Piotr Roszatycki <dexter@debian.org>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* written by Jim Meyering */
#include <config.h>
#if defined(HAVE_LSTAT) && !defined(LSTAT_FOLLOWS_SLASHED_SYMLINK)
/* Get the original definition of lstat. It might be defined as a macro. */
# define __need_system_sys_stat_h
# define _BSD_SOURCE 1
# include <sys/types.h>
# include <sys/stat.h>
# undef __need_system_sys_stat_h
static inline int
orig_lstat (const char *filename, struct stat *buf)
{
return lstat (filename, buf);
}
/* Specification. */
# include <sys/stat.h>
# include <string.h>
# include <errno.h>
# include "libfakechroot.h"
/* lstat works differently on Linux and Solaris systems. POSIX (see
`pathname resolution' in the glossary) requires that programs like
`ls' take into consideration the fact that FILE has a trailing slash
when FILE is a symbolic link. On Linux and Solaris 10 systems, the
lstat function already has the desired semantics (in treating
`lstat ("symlink/", sbuf)' just like `lstat ("symlink/.", sbuf)',
but on Solaris 9 and earlier it does not.
If FILE has a trailing slash and specifies a symbolic link,
then use stat() to get more info on the referent of FILE.
If the referent is a non-directory, then set errno to ENOTDIR
and return -1. Otherwise, return stat's result. */
LOCAL int
rpl_lstat (const char *file, struct stat *sbuf)
{
size_t len;
int lstat_result = orig_lstat (file, sbuf);
debug("rpl_lstat(\"%s\", &sbuf)", file);
if (lstat_result != 0)
return lstat_result;
/* This replacement file can blindly check against '/' rather than
using the ISSLASH macro, because all platforms with '\\' either
lack symlinks (mingw) or have working lstat (cygwin) and thus do
not compile this file. 0 len should have already been filtered
out above, with a failure return of ENOENT. */
len = strlen (file);
if (file[len - 1] != '/' || S_ISDIR (sbuf->st_mode))
return 0;
/* At this point, a trailing slash is only permitted on
symlink-to-dir; but it should have found information on the
directory, not the symlink. Call stat() to get info about the
link's referent. Our replacement stat guarantees valid results,
even if the symlink is not pointing to a directory. */
if (!S_ISLNK (sbuf->st_mode))
{
errno = ENOTDIR;
return -1;
}
return stat (file, sbuf);
}
#else
typedef int empty_translation_unit;
#endif /* HAVE_LSTAT */
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