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|
/* vi: set sw=4 ts=4: */
/*
* Mini copy_file implementation for busybox
*
* Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <utime.h>
#include <errno.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include "busybox.h"
/* Compiler version-specific crap that should be in a header file somewhere. */
#if !((__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1))
#define lchown chown
#endif
int copy_file(const char *source, const char *dest, int flags)
{
struct stat source_stat;
struct stat dest_stat;
int dest_exists = 0;
int status = 0;
if ((!(flags & FILEUTILS_DEREFERENCE) &&
lstat(source, &source_stat) < 0) ||
((flags & FILEUTILS_DEREFERENCE) &&
stat(source, &source_stat) < 0)) {
bb_perror_msg("%s", source);
return -1;
}
if (lstat(dest, &dest_stat) < 0) {
if (errno != ENOENT) {
bb_perror_msg("unable to stat `%s'", dest);
return -1;
}
} else {
if (source_stat.st_dev == dest_stat.st_dev &&
source_stat.st_ino == dest_stat.st_ino)
{
bb_error_msg("`%s' and `%s' are the same file", source, dest);
return -1;
}
dest_exists = 1;
}
if (S_ISDIR(source_stat.st_mode)) {
DIR *dp;
struct dirent *d;
mode_t saved_umask = 0;
if (!(flags & FILEUTILS_RECUR)) {
bb_error_msg("%s: omitting directory", source);
return -1;
}
/* Create DEST. */
if (dest_exists) {
if (!S_ISDIR(dest_stat.st_mode)) {
bb_error_msg("`%s' is not a directory", dest);
return -1;
}
} else {
mode_t mode;
saved_umask = umask(0);
mode = source_stat.st_mode;
if (!(flags & FILEUTILS_PRESERVE_STATUS))
mode = source_stat.st_mode & ~saved_umask;
mode |= S_IRWXU;
if (mkdir(dest, mode) < 0) {
umask(saved_umask);
bb_perror_msg("cannot create directory `%s'", dest);
return -1;
}
umask(saved_umask);
}
/* Recursively copy files in SOURCE. */
if ((dp = opendir(source)) == NULL) {
bb_perror_msg("unable to open directory `%s'", source);
status = -1;
goto preserve_status;
}
while ((d = readdir(dp)) != NULL) {
char *new_source, *new_dest;
new_source = concat_subpath_file(source, d->d_name);
if(new_source == NULL)
continue;
new_dest = concat_path_file(dest, d->d_name);
if (copy_file(new_source, new_dest, flags) < 0)
status = -1;
free(new_source);
free(new_dest);
}
/* closedir have only EBADF error, but "dp" not changes */
closedir(dp);
if (!dest_exists &&
chmod(dest, source_stat.st_mode & ~saved_umask) < 0) {
bb_perror_msg("unable to change permissions of `%s'", dest);
status = -1;
}
} else if (S_ISREG(source_stat.st_mode) || (flags & FILEUTILS_DEREFERENCE))
{
int src_fd;
int dst_fd;
#ifdef CONFIG_FEATURE_PRESERVE_HARDLINKS
char *link_name;
if (!(flags & FILEUTILS_DEREFERENCE) &&
is_in_ino_dev_hashtable(&source_stat, &link_name)) {
if (link(link_name, dest) < 0) {
bb_perror_msg("unable to link `%s'", dest);
return -1;
}
return 0;
}
add_to_ino_dev_hashtable(&source_stat, dest);
#endif
src_fd = open(source, O_RDONLY);
if (src_fd == -1) {
bb_perror_msg("unable to open `%s'", source);
return(-1);
}
if (dest_exists) {
if (flags & FILEUTILS_INTERACTIVE) {
fprintf(stderr, "%s: overwrite `%s'? ", bb_applet_name, dest);
if (!bb_ask_confirmation()) {
close (src_fd);
return 0;
}
}
dst_fd = open(dest, O_WRONLY|O_TRUNC);
if (dst_fd == -1) {
if (!(flags & FILEUTILS_FORCE)) {
bb_perror_msg("unable to open `%s'", dest);
close(src_fd);
return -1;
}
if (unlink(dest) < 0) {
bb_perror_msg("unable to remove `%s'", dest);
close(src_fd);
return -1;
}
goto dest_removed;
}
} else {
dest_removed:
dst_fd = open(dest, O_WRONLY|O_CREAT, source_stat.st_mode);
if (dst_fd == -1) {
bb_perror_msg("unable to open `%s'", dest);
close(src_fd);
return(-1);
}
}
if (bb_copyfd_eof(src_fd, dst_fd) == -1)
status = -1;
if (close(dst_fd) < 0) {
bb_perror_msg("unable to close `%s'", dest);
status = -1;
}
if (close(src_fd) < 0) {
bb_perror_msg("unable to close `%s'", source);
status = -1;
}
} else if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode) ||
S_ISSOCK(source_stat.st_mode) || S_ISFIFO(source_stat.st_mode) ||
S_ISLNK(source_stat.st_mode)) {
if (dest_exists) {
if((flags & FILEUTILS_FORCE) == 0) {
fprintf(stderr, "`%s' exists\n", dest);
return -1;
}
if(unlink(dest) < 0) {
bb_perror_msg("unable to remove `%s'", dest);
return -1;
}
}
if (S_ISFIFO(source_stat.st_mode)) {
if (mkfifo(dest, source_stat.st_mode) < 0) {
bb_perror_msg("cannot create fifo `%s'", dest);
return -1;
}
} else if (S_ISLNK(source_stat.st_mode)) {
char *lpath;
lpath = xreadlink(source);
if (symlink(lpath, dest) < 0) {
bb_perror_msg("cannot create symlink `%s'", dest);
return -1;
}
free(lpath);
if (flags & FILEUTILS_PRESERVE_STATUS)
if (lchown(dest, source_stat.st_uid, source_stat.st_gid) < 0)
bb_perror_msg("unable to preserve ownership of `%s'", dest);
return 0;
} else {
if (mknod(dest, source_stat.st_mode, source_stat.st_rdev) < 0) {
bb_perror_msg("unable to create `%s'", dest);
return -1;
}
}
} else {
bb_error_msg("internal error: unrecognized file type");
return -1;
}
preserve_status:
if (flags & FILEUTILS_PRESERVE_STATUS) {
struct utimbuf times;
char *msg="unable to preserve %s of `%s'";
times.actime = source_stat.st_atime;
times.modtime = source_stat.st_mtime;
if (utime(dest, ×) < 0)
bb_perror_msg(msg, "times", dest);
if (chown(dest, source_stat.st_uid, source_stat.st_gid) < 0) {
source_stat.st_mode &= ~(S_ISUID | S_ISGID);
bb_perror_msg(msg, "ownership", dest);
}
if (chmod(dest, source_stat.st_mode) < 0)
bb_perror_msg(msg, "permissions", dest);
}
return status;
}
|
