busybox/libbb/copy_file.c

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