/* rename.c -- rename a file, preserving symlinks.
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/* rename.c -- rename a file, preserving symlinks.
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Copyright 1999, 2002, 2003, 2005, 2007, 2008 Free Software Foundation, Inc.
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Copyright 1999, 2002, 2003, 2005, 2007, 2008 Free Software Foundation, Inc.
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This file is part of GNU Binutils.
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This file is part of GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program 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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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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02110-1301, USA. */
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#include "sysdep.h"
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#include "sysdep.h"
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#include "bfd.h"
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#include "bfd.h"
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#include "bucomm.h"
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#include "bucomm.h"
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#include <sys/stat.h>
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#ifdef HAVE_GOOD_UTIME_H
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#ifdef HAVE_GOOD_UTIME_H
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#include <utime.h>
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#include <utime.h>
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#else /* ! HAVE_GOOD_UTIME_H */
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#else /* ! HAVE_GOOD_UTIME_H */
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#ifdef HAVE_UTIMES
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#ifdef HAVE_UTIMES
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#include <sys/time.h>
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#include <sys/time.h>
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#endif /* HAVE_UTIMES */
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#endif /* HAVE_UTIMES */
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#endif /* ! HAVE_GOOD_UTIME_H */
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#endif /* ! HAVE_GOOD_UTIME_H */
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#if ! defined (_WIN32) || defined (__CYGWIN32__)
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#if ! defined (_WIN32) || defined (__CYGWIN32__)
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static int simple_copy (const char *, const char *);
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static int simple_copy (const char *, const char *);
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/* The number of bytes to copy at once. */
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/* The number of bytes to copy at once. */
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#define COPY_BUF 8192
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#define COPY_BUF 8192
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/* Copy file FROM to file TO, performing no translations.
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/* Copy file FROM to file TO, performing no translations.
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Return 0 if ok, -1 if error. */
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Return 0 if ok, -1 if error. */
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static int
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static int
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simple_copy (const char *from, const char *to)
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simple_copy (const char *from, const char *to)
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{
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{
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int fromfd, tofd, nread;
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int fromfd, tofd, nread;
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int saved;
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int saved;
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char buf[COPY_BUF];
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char buf[COPY_BUF];
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fromfd = open (from, O_RDONLY | O_BINARY);
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fromfd = open (from, O_RDONLY | O_BINARY);
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if (fromfd < 0)
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if (fromfd < 0)
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return -1;
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return -1;
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#ifdef O_CREAT
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#ifdef O_CREAT
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tofd = open (to, O_CREAT | O_WRONLY | O_TRUNC | O_BINARY, 0777);
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tofd = open (to, O_CREAT | O_WRONLY | O_TRUNC | O_BINARY, 0777);
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#else
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#else
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tofd = creat (to, 0777);
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tofd = creat (to, 0777);
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#endif
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#endif
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if (tofd < 0)
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if (tofd < 0)
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{
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{
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saved = errno;
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saved = errno;
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close (fromfd);
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close (fromfd);
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errno = saved;
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errno = saved;
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return -1;
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return -1;
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}
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}
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while ((nread = read (fromfd, buf, sizeof buf)) > 0)
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while ((nread = read (fromfd, buf, sizeof buf)) > 0)
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{
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{
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if (write (tofd, buf, nread) != nread)
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if (write (tofd, buf, nread) != nread)
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{
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{
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saved = errno;
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saved = errno;
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close (fromfd);
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close (fromfd);
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close (tofd);
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close (tofd);
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errno = saved;
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errno = saved;
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return -1;
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return -1;
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}
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}
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}
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}
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saved = errno;
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saved = errno;
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close (fromfd);
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close (fromfd);
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close (tofd);
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close (tofd);
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if (nread < 0)
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if (nread < 0)
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{
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{
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errno = saved;
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errno = saved;
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return -1;
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return -1;
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}
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}
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return 0;
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return 0;
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}
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}
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#endif /* __CYGWIN32__ or not _WIN32 */
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#endif /* __CYGWIN32__ or not _WIN32 */
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/* Set the times of the file DESTINATION to be the same as those in
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/* Set the times of the file DESTINATION to be the same as those in
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STATBUF. */
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STATBUF. */
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void
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void
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set_times (const char *destination, const struct stat *statbuf)
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set_times (const char *destination, const struct stat *statbuf)
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{
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{
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int result;
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int result;
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{
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{
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#ifdef HAVE_GOOD_UTIME_H
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#ifdef HAVE_GOOD_UTIME_H
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struct utimbuf tb;
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struct utimbuf tb;
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tb.actime = statbuf->st_atime;
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tb.actime = statbuf->st_atime;
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tb.modtime = statbuf->st_mtime;
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tb.modtime = statbuf->st_mtime;
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result = utime (destination, &tb);
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result = utime (destination, &tb);
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#else /* ! HAVE_GOOD_UTIME_H */
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#else /* ! HAVE_GOOD_UTIME_H */
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#ifndef HAVE_UTIMES
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#ifndef HAVE_UTIMES
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long tb[2];
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long tb[2];
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tb[0] = statbuf->st_atime;
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tb[0] = statbuf->st_atime;
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tb[1] = statbuf->st_mtime;
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tb[1] = statbuf->st_mtime;
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result = utime (destination, tb);
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result = utime (destination, tb);
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#else /* HAVE_UTIMES */
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#else /* HAVE_UTIMES */
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struct timeval tv[2];
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struct timeval tv[2];
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tv[0].tv_sec = statbuf->st_atime;
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tv[0].tv_sec = statbuf->st_atime;
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tv[0].tv_usec = 0;
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tv[0].tv_usec = 0;
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tv[1].tv_sec = statbuf->st_mtime;
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tv[1].tv_sec = statbuf->st_mtime;
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tv[1].tv_usec = 0;
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tv[1].tv_usec = 0;
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result = utimes (destination, tv);
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result = utimes (destination, tv);
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#endif /* HAVE_UTIMES */
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#endif /* HAVE_UTIMES */
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#endif /* ! HAVE_GOOD_UTIME_H */
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#endif /* ! HAVE_GOOD_UTIME_H */
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}
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}
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if (result != 0)
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if (result != 0)
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non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno));
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non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno));
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}
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}
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#ifndef S_ISLNK
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#ifndef S_ISLNK
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#ifdef S_IFLNK
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#ifdef S_IFLNK
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#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
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#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
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#else
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#else
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#define S_ISLNK(m) 0
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#define S_ISLNK(m) 0
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#define lstat stat
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#define lstat stat
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#endif
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#endif
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#endif
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#endif
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/* Rename FROM to TO, copying if TO is a link.
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/* Rename FROM to TO, copying if TO is a link.
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Return 0 if ok, -1 if error. */
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Return 0 if ok, -1 if error. */
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int
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int
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smart_rename (const char *from, const char *to, int preserve_dates ATTRIBUTE_UNUSED)
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smart_rename (const char *from, const char *to, int preserve_dates ATTRIBUTE_UNUSED)
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{
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{
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bfd_boolean exists;
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bfd_boolean exists;
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struct stat s;
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struct stat s;
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int ret = 0;
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int ret = 0;
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exists = lstat (to, &s) == 0;
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exists = lstat (to, &s) == 0;
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#if defined (_WIN32) && !defined (__CYGWIN32__)
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#if defined (_WIN32) && !defined (__CYGWIN32__)
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/* Win32, unlike unix, will not erase `to' in `rename(from, to)' but
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/* Win32, unlike unix, will not erase `to' in `rename(from, to)' but
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fail instead. Also, chown is not present. */
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fail instead. Also, chown is not present. */
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if (exists)
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if (exists)
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remove (to);
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remove (to);
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ret = rename (from, to);
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ret = rename (from, to);
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if (ret != 0)
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if (ret != 0)
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{
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{
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/* We have to clean up here. */
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/* We have to clean up here. */
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non_fatal (_("unable to rename '%s'; reason: %s"), to, strerror (errno));
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non_fatal (_("unable to rename '%s'; reason: %s"), to, strerror (errno));
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unlink (from);
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unlink (from);
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}
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}
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#else
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#else
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/* Use rename only if TO is not a symbolic link and has
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/* Use rename only if TO is not a symbolic link and has
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only one hard link, and we have permission to write to it. */
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only one hard link, and we have permission to write to it. */
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if (! exists
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if (! exists
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|| (!S_ISLNK (s.st_mode)
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|| (!S_ISLNK (s.st_mode)
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&& S_ISREG (s.st_mode)
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&& S_ISREG (s.st_mode)
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&& (s.st_mode & S_IWUSR)
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&& (s.st_mode & S_IWUSR)
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&& s.st_nlink == 1)
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&& s.st_nlink == 1)
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)
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)
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{
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{
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ret = rename (from, to);
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ret = rename (from, to);
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if (ret == 0)
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if (ret == 0)
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{
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{
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if (exists)
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if (exists)
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{
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{
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/* Try to preserve the permission bits and ownership of
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/* Try to preserve the permission bits and ownership of
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TO. First get the mode right except for the setuid
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TO. First get the mode right except for the setuid
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bit. Then change the ownership. Then fix the setuid
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bit. Then change the ownership. Then fix the setuid
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bit. We do the chmod before the chown because if the
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bit. We do the chmod before the chown because if the
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chown succeeds, and we are a normal user, we won't be
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chown succeeds, and we are a normal user, we won't be
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able to do the chmod afterward. We don't bother to
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able to do the chmod afterward. We don't bother to
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fix the setuid bit first because that might introduce
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fix the setuid bit first because that might introduce
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a fleeting security problem, and because the chown
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a fleeting security problem, and because the chown
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will clear the setuid bit anyhow. We only fix the
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will clear the setuid bit anyhow. We only fix the
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setuid bit if the chown succeeds, because we don't
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setuid bit if the chown succeeds, because we don't
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want to introduce an unexpected setuid file owned by
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want to introduce an unexpected setuid file owned by
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the user running objcopy. */
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the user running objcopy. */
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chmod (to, s.st_mode & 0777);
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chmod (to, s.st_mode & 0777);
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if (chown (to, s.st_uid, s.st_gid) >= 0)
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if (chown (to, s.st_uid, s.st_gid) >= 0)
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chmod (to, s.st_mode & 07777);
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chmod (to, s.st_mode & 07777);
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}
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}
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}
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}
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else
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else
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{
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{
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/* We have to clean up here. */
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/* We have to clean up here. */
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non_fatal (_("unable to rename '%s'; reason: %s"), to, strerror (errno));
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non_fatal (_("unable to rename '%s'; reason: %s"), to, strerror (errno));
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unlink (from);
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unlink (from);
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}
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}
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}
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}
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else
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else
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{
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{
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ret = simple_copy (from, to);
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ret = simple_copy (from, to);
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if (ret != 0)
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if (ret != 0)
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non_fatal (_("unable to copy file '%s'; reason: %s"), to, strerror (errno));
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non_fatal (_("unable to copy file '%s'; reason: %s"), to, strerror (errno));
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if (preserve_dates)
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if (preserve_dates)
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set_times (to, &s);
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set_times (to, &s);
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unlink (from);
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unlink (from);
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}
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}
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#endif /* _WIN32 && !__CYGWIN32__ */
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#endif /* _WIN32 && !__CYGWIN32__ */
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return ret;
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return ret;
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}
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}
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