Rewrite cp and mv to be SUSv2 compliant.
This commit is contained in:
Matt Kraai
@@ -1,10 +1,9 @@
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/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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* Mini copy_file implementation for busybox
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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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* Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
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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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@@ -20,179 +19,226 @@
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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 <sys/types.h>
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#include <sys/stat.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 <utime.h>
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#include <errno.h>
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#include <dirent.h>
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#include <stdlib.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 *src_name, const char *dst_name,
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int set_modes, int follow_links, int force_flag, int quiet_flag)
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int copy_file(const char *source, const char *dest, int flags)
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{
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FILE *src_file = NULL;
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FILE *dst_file = NULL;
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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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int src_status;
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int dst_status;
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struct stat source_stat;
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struct stat dest_stat;
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int dest_exists = 1;
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int status = 0;
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if (follow_links == TRUE) {
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src_status = stat(src_name, &srcStatBuf);
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dst_status = stat(dst_name, &dstStatBuf);
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} else {
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src_status = lstat(src_name, &srcStatBuf);
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dst_status = lstat(dst_name, &dstStatBuf);
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if (((flags & CP_PRESERVE_SYMLINKS) && lstat(source, &source_stat) < 0) ||
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(!(flags & CP_PRESERVE_SYMLINKS) &&
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stat(source, &source_stat) < 0)) {
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perror_msg("%s", source);
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return -1;
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}
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if (src_status < 0) {
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if (!quiet_flag) {
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perror_msg("%s", src_name);
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if (stat(dest, &dest_stat) < 0) {
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if (errno != ENOENT) {
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perror_msg("unable to stat `%s'", dest);
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return -1;
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}
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return FALSE;
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dest_exists = 0;
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}
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if ((dst_status < 0) || force_flag) {
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unlink(dst_name);
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dstStatBuf.st_ino = -1;
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dstStatBuf.st_dev = -1;
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if (dest_exists && source_stat.st_rdev == dest_stat.st_rdev &&
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source_stat.st_ino == dest_stat.st_ino) {
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error_msg("`%s' and `%s' are the same file", source, dest);
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return -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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if (!quiet_flag) {
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error_msg("Copying file \"%s\" to itself", src_name);
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if (S_ISDIR(source_stat.st_mode)) {
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DIR *dp;
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struct dirent *d;
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if (!(flags & CP_RECUR)) {
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error_msg("%s: omitting directory", source);
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return -1;
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}
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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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dst_status = create_path(dst_name, 0777777 ^ umask(0));
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if ((dst_status < 0) && (errno != EEXIST)) {
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if (!quiet_flag) {
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perror_msg("%s", dst_name);
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/* Create DEST. */
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if (dest_exists) {
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if (!S_ISDIR(dest_stat.st_mode)) {
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error_msg("`%s' is not a directory", dest);
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return -1;
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}
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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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} else {
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mode_t mode, saved_umask;
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saved_umask = umask(0);
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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(src_name, &link_val[0], BUFSIZ);
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if (link_size < 0) {
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if (quiet_flag) {
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perror_msg("%s", src_name);
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mode = source_stat.st_mode;
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if (!(flags & CP_PRESERVE_STATUS))
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mode = source_stat.st_mode & ~saved_umask;
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mode |= S_IRWXU;
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if (mkdir(dest, mode) < 0) {
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umask(saved_umask);
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perror_msg("cannot create directory `%s'", dest);
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return -1;
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}
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return FALSE;
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umask(saved_umask);
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}
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link_val[link_size] = '\0';
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src_status = symlink(link_val, dst_name);
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if (src_status < 0) {
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if (!quiet_flag) {
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perror_msg("%s", dst_name);
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/* Recursively copy files in SOURCE. */
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if ((dp = opendir(source)) == NULL) {
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perror_msg("unable to open directory `%s'", source);
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status = -1;
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goto end;
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}
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while ((d = readdir(dp)) != NULL) {
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char *new_source, *new_dest;
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if (strcmp(d->d_name, ".") == 0 ||
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strcmp(d->d_name, "..") == 0)
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continue;
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new_source = concat_path_file(source, d->d_name);
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new_dest = concat_path_file(dest, d->d_name);
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if (copy_file(new_source, new_dest, flags) < 0)
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status = -1;
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free(new_source);
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free(new_dest);
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}
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/* ??? What if an error occurs in readdir? */
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if (closedir(dp) < 0) {
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perror_msg("unable to close directory `%s'", source);
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status = -1;
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}
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} else if (S_ISREG(source_stat.st_mode)) {
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FILE *sfp, *dfp;
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if (dest_exists) {
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if (flags & CP_INTERACTIVE) {
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fprintf(stderr, "cp: overwrite `%s'? ", dest);
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if (!ask_confirmation())
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return 0;
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}
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if ((dfp = fopen(dest, "w")) == NULL) {
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if (!(flags & CP_FORCE)) {
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perror_msg("unable to open `%s'", dest);
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return -1;
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}
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if (unlink(dest) < 0) {
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perror_msg("unable to remove `%s'", dest);
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return -1;
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}
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dest_exists = 0;
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}
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return FALSE;
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}
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if (!dest_exists) {
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int fd;
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if ((fd = open(dest, O_WRONLY|O_CREAT, source_stat.st_mode)) < 0 ||
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(dfp = fdopen(fd, "w")) == NULL) {
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if (fd >= 0)
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close(fd);
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perror_msg("unable to open `%s'", dest);
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return -1;
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}
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}
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if ((sfp = fopen(source, "r")) == NULL) {
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fclose(dfp);
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perror_msg("unable to open `%s'", source);
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status = -1;
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goto end;
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}
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copy_file_chunk(sfp, dfp, source_stat.st_size);
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if (fclose(dfp) < 0) {
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perror_msg("unable to close `%s'", dest);
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status = -1;
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}
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if (fclose(sfp) < 0) {
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perror_msg("unable to close `%s'", source);
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status = -1;
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}
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} else if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode) ||
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S_ISSOCK(source_stat.st_mode)) {
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if (mknod(dest, source_stat.st_mode, source_stat.st_rdev) < 0) {
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perror_msg("unable to create `%s'", dest);
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return -1;
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}
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} else if (S_ISFIFO(source_stat.st_mode)) {
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mode_t mode, saved_umask;
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saved_umask = umask(0);
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mode = source_stat.st_mode;
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if (!(flags & CP_PRESERVE_STATUS))
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mode = source_stat.st_mode & ~saved_umask;
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mode |= S_IRWXU;
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if (mkfifo(dest, mode) < 0) {
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umask(saved_umask);
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perror_msg("cannot create fifo `%s'", dest);
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return -1;
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}
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umask(saved_umask);
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} else if (S_ISLNK(source_stat.st_mode)) {
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char buf[BUFSIZ + 1];
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if (readlink(source, buf, BUFSIZ) < 0) {
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perror_msg("cannot read `%s'", source);
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return -1;
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}
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buf[BUFSIZ] = '\0';
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if (symlink(buf, dest) < 0) {
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perror_msg("cannot create symlink `%s'", dest);
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return -1;
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}
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#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
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if (set_modes == TRUE) {
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/* Try to set owner, but fail silently like GNU cp */
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lchown(dst_name, srcStatBuf.st_uid, srcStatBuf.st_gid);
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}
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if (flags & CP_PRESERVE_STATUS)
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if (lchown(dest, source_stat.st_uid, source_stat.st_gid) < 0)
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perror_msg("unable to preserve ownership of `%s'", dest);
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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(dst_name, 0644) < 0) {
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if (!quiet_flag) {
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perror_msg("%s", dst_name);
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}
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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(dst_name, srcStatBuf.st_mode, srcStatBuf.st_rdev) < 0) {
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if (!quiet_flag) {
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perror_msg("%s", dst_name);
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}
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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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src_file = fopen(src_name, "r");
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if (src_file == NULL) {
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if (!quiet_flag) {
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perror_msg("%s", src_name);
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}
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return FALSE;
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}
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dst_file = fopen(dst_name, "w");
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chmod(dst_name, srcStatBuf.st_mode);
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if (dst_file == NULL) {
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if (!quiet_flag) {
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perror_msg("%s", dst_name);
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}
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fclose(src_file);
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return FALSE;
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}
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if (copy_file_chunk(src_file, dst_file, srcStatBuf.st_size)==FALSE) {
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goto error_exit;
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}
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fclose(src_file);
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if (fclose(dst_file) < 0) {
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return FALSE;
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}
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return 0;
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} else {
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error_msg("internal error: unrecognized file type");
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return -1;
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}
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if (set_modes == TRUE) {
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/* This is fine, since symlinks never get here */
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if (chown(dst_name, srcStatBuf.st_uid, srcStatBuf.st_gid) < 0)
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perror_msg("%s", dst_name);
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if (chmod(dst_name, srcStatBuf.st_mode) < 0)
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perror_msg("%s", dst_name);
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times.actime = srcStatBuf.st_atime;
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times.modtime = srcStatBuf.st_mtime;
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if (utime(dst_name, ×) < 0)
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perror_msg("%s", dst_name);
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end:
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if (flags & CP_PRESERVE_STATUS) {
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struct utimbuf times;
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times.actime = source_stat.st_atime;
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times.modtime = source_stat.st_mtime;
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if (utime(dest, ×) < 0)
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perror_msg("unable to preserve times of `%s'", dest);
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if (chown(dest, source_stat.st_uid, source_stat.st_gid) < 0) {
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source_stat.st_mode &= ~(S_ISUID | S_ISGID);
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perror_msg("unable to preserve ownership of `%s'", dest);
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}
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if (chmod(dest, source_stat.st_mode) < 0)
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perror_msg("unable to preserve permissions of `%s'", dest);
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}
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return TRUE;
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error_exit:
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perror_msg("%s", dst_name);
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fclose(src_file);
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fclose(dst_file);
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return FALSE;
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return 0;
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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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Reference in New Issue
Block a user