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181 lines
4.8 KiB
C
181 lines
4.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) tons of folks. Tracking down who wrote what
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* isn't something I'm going to worry about... If you wrote something
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* here, please feel free to acknowledge your work.
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*
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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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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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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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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
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* Permission has been granted to redistribute this code under the GPL.
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*
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <utime.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include "libbb.h"
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/*
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* Copy one file to another, while possibly preserving its modes, times, and
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* modes. Returns TRUE if successful, or FALSE on a failure with an error
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* message output. (Failure is not indicated if attributes cannot be set.)
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* -Erik Andersen
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*/
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int
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copy_file(const char *srcName, const char *destName,
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int setModes, int followLinks, int forceFlag)
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{
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int rfd;
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int wfd;
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int status;
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struct stat srcStatBuf;
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struct stat dstStatBuf;
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struct utimbuf times;
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if (followLinks == TRUE)
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status = stat(srcName, &srcStatBuf);
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else
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status = lstat(srcName, &srcStatBuf);
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if (status < 0) {
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perror_msg("%s", srcName);
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return FALSE;
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}
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if (followLinks == TRUE)
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status = stat(destName, &dstStatBuf);
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else
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status = lstat(destName, &dstStatBuf);
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if (status < 0 || forceFlag==TRUE) {
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unlink(destName);
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dstStatBuf.st_ino = -1;
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dstStatBuf.st_dev = -1;
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}
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if ((srcStatBuf.st_dev == dstStatBuf.st_dev) &&
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(srcStatBuf.st_ino == dstStatBuf.st_ino)) {
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error_msg("Copying file \"%s\" to itself", srcName);
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return FALSE;
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}
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if (S_ISDIR(srcStatBuf.st_mode)) {
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//fprintf(stderr, "copying directory %s to %s\n", srcName, destName);
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/* Make sure the directory is writable */
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status = mkdir(destName, 0777777 ^ umask(0));
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if (status < 0 && errno != EEXIST) {
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perror_msg("%s", destName);
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return FALSE;
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}
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} else if (S_ISLNK(srcStatBuf.st_mode)) {
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char link_val[BUFSIZ + 1];
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int link_size;
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//fprintf(stderr, "copying link %s to %s\n", srcName, destName);
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/* Warning: This could possibly truncate silently, to BUFSIZ chars */
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link_size = readlink(srcName, &link_val[0], BUFSIZ);
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if (link_size < 0) {
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perror_msg("%s", srcName);
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return FALSE;
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}
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link_val[link_size] = '\0';
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status = symlink(link_val, destName);
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if (status < 0) {
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perror_msg("%s", destName);
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return FALSE;
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}
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#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
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if (setModes == TRUE) {
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/* Try to set owner, but fail silently like GNU cp */
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lchown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid);
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}
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#endif
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return TRUE;
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} else if (S_ISFIFO(srcStatBuf.st_mode)) {
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//fprintf(stderr, "copying fifo %s to %s\n", srcName, destName);
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if (mkfifo(destName, 0644) < 0) {
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perror_msg("%s", destName);
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return FALSE;
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}
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} else if (S_ISBLK(srcStatBuf.st_mode) || S_ISCHR(srcStatBuf.st_mode)
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|| S_ISSOCK(srcStatBuf.st_mode)) {
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//fprintf(stderr, "copying soc, blk, or chr %s to %s\n", srcName, destName);
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if (mknod(destName, srcStatBuf.st_mode, srcStatBuf.st_rdev) < 0) {
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perror_msg("%s", destName);
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return FALSE;
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}
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} else if (S_ISREG(srcStatBuf.st_mode)) {
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//fprintf(stderr, "copying regular file %s to %s\n", srcName, destName);
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rfd = open(srcName, O_RDONLY);
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if (rfd < 0) {
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perror_msg("%s", srcName);
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return FALSE;
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}
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wfd = open(destName, O_WRONLY | O_CREAT | O_TRUNC,
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srcStatBuf.st_mode);
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if (wfd < 0) {
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perror_msg("%s", destName);
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close(rfd);
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return FALSE;
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}
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if (copy_file_chunk(rfd, wfd, srcStatBuf.st_size)==FALSE)
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goto error_exit;
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close(rfd);
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if (close(wfd) < 0) {
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return FALSE;
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}
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}
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if (setModes == TRUE) {
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/* This is fine, since symlinks never get here */
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if (chown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid) < 0)
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perror_msg_and_die("%s", destName);
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if (chmod(destName, srcStatBuf.st_mode) < 0)
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perror_msg_and_die("%s", destName);
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times.actime = srcStatBuf.st_atime;
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times.modtime = srcStatBuf.st_mtime;
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if (utime(destName, ×) < 0)
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perror_msg_and_die("%s", destName);
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}
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return TRUE;
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error_exit:
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perror_msg("%s", destName);
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close(rfd);
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close(wfd);
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return FALSE;
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}
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/* END CODE */
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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