libbb/copy_file.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini copy_file implementation for busybox
   4  *
   5  * Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  *
  21  */
  22
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <utime.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #include "busybox.h"
  34
  35 int copy_file(const char *source, const char *dest, int flags)
  36 {
  37         struct stat source_stat;
  38         struct stat dest_stat;
  39         int dest_exists = 0;
  40         int status = 0;
  41
  42         if ((!(flags & FILEUTILS_DEREFERENCE) &&
  43                         lstat(source, &source_stat) < 0) ||
  44                         ((flags & FILEUTILS_DEREFERENCE) &&
  45                          stat(source, &source_stat) < 0)) {
  46                 bb_perror_msg("%s", source);
  47                 return -1;
  48         }
  49
  50         if (lstat(dest, &dest_stat) < 0) {
  51                 if (errno != ENOENT) {
  52                         bb_perror_msg("unable to stat `%s'", dest);
  53                         return -1;
  54                 }
  55         } else {
  56                 if (source_stat.st_dev == dest_stat.st_dev &&
  57                         source_stat.st_ino == dest_stat.st_ino)
  58                 {
  59                         bb_error_msg("`%s' and `%s' are the same file", source, dest);
  60                         return -1;
  61                 }
  62                 dest_exists = 1;
  63         }
  64
  65         if (S_ISDIR(source_stat.st_mode)) {
  66                 DIR *dp;
  67                 struct dirent *d;
  68                 mode_t saved_umask = 0;
  69
  70                 if (!(flags & FILEUTILS_RECUR)) {
  71                         bb_error_msg("%s: omitting directory", source);
  72                         return -1;
  73                 }
  74
  75                 /* Create DEST.  */
  76                 if (dest_exists) {
  77                         if (!S_ISDIR(dest_stat.st_mode)) {
  78                                 bb_error_msg("`%s' is not a directory", dest);
  79                                 return -1;
  80                         }
  81                 } else {
  82                         mode_t mode;
  83                         saved_umask = umask(0);
  84
  85                         mode = source_stat.st_mode;
  86                         if (!(flags & FILEUTILS_PRESERVE_STATUS))
  87                                 mode = source_stat.st_mode & ~saved_umask;
  88                         mode |= S_IRWXU;
  89
  90                         if (mkdir(dest, mode) < 0) {
  91                                 umask(saved_umask);
  92                                 bb_perror_msg("cannot create directory `%s'", dest);
  93                                 return -1;
  94                         }
  95
  96                         umask(saved_umask);
  97                 }
  98
  99                 /* Recursively copy files in SOURCE.  */
 100                 if ((dp = opendir(source)) == NULL) {
 101                         bb_perror_msg("unable to open directory `%s'", source);
 102                         status = -1;
 103                         goto end;
 104                 }
 105
 106                 while ((d = readdir(dp)) != NULL) {
 107                         char *new_source, *new_dest;
 108
 109                         new_source = concat_subpath_file(source, d->d_name);
 110                         if(new_source == NULL)
 111                                 continue;
 112                         new_dest = concat_path_file(dest, d->d_name);
 113                         if (copy_file(new_source, new_dest, flags) < 0)
 114                                 status = -1;
 115                         free(new_source);
 116                         free(new_dest);
 117                 }
 118                 /* closedir have only EBADF error, but "dp" not changes */
 119                 closedir(dp);
 120
 121                 if (!dest_exists &&
 122                                 chmod(dest, source_stat.st_mode & ~saved_umask) < 0) {
 123                         bb_perror_msg("unable to change permissions of `%s'", dest);
 124                         status = -1;
 125                 }
 126         } else if (S_ISREG(source_stat.st_mode)) {
 127                 int src_fd;
 128                 int dst_fd;
 129 #ifdef CONFIG_FEATURE_PRESERVE_HARDLINKS
 130                 char *link_name;
 131
 132                 if (!(flags & FILEUTILS_DEREFERENCE) &&
 133                                 is_in_ino_dev_hashtable(&source_stat, &link_name)) {
 134                         if (link(link_name, dest) < 0) {
 135                                 bb_perror_msg("unable to link `%s'", dest);
 136                                 return -1;
 137                         }
 138
 139                         return 0;
 140                 }
 141 #endif
 142                 src_fd = open(source, O_RDONLY);
 143                 if (src_fd == -1) {
 144                         bb_perror_msg("unable to open `%s'", source);
 145                         return(-1);
 146                 }
 147
 148                 if (dest_exists) {
 149                         if (flags & FILEUTILS_INTERACTIVE) {
 150                                 bb_error_msg("overwrite `%s'? ", dest);
 151                                 if (!bb_ask_confirmation()) {
 152                                         close (src_fd);
 153                                         return 0;
 154                                 }
 155                         }
 156
 157                         dst_fd = open(dest, O_WRONLY|O_TRUNC);
 158                         if (dst_fd == -1) {
 159                                 if (!(flags & FILEUTILS_FORCE)) {
 160                                         bb_perror_msg("unable to open `%s'", dest);
 161                                         close(src_fd);
 162                                         return -1;
 163                                 }
 164
 165                                 if (unlink(dest) < 0) {
 166                                         bb_perror_msg("unable to remove `%s'", dest);
 167                                         close(src_fd);
 168                                         return -1;
 169                                 }
 170
 171                                 dest_exists = 0;
 172                         }
 173                 }
 174
 175                 if (!dest_exists) {
 176                         dst_fd = open(dest, O_WRONLY|O_CREAT, source_stat.st_mode);
 177                         if (dst_fd == -1) {
 178                                 bb_perror_msg("unable to open `%s'", dest);
 179                                 close(src_fd);
 180                                 return(-1);
 181                         }
 182                 }
 183
 184                 if (bb_copyfd_eof(src_fd, dst_fd) == -1)
 185                         status = -1;
 186
 187                 if (close(dst_fd) < 0) {
 188                         bb_perror_msg("unable to close `%s'", dest);
 189                         status = -1;
 190                 }
 191
 192                 if (close(src_fd) < 0) {
 193                         bb_perror_msg("unable to close `%s'", source);
 194                         status = -1;
 195                 }
 196                         }
 197         else if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode) ||
 198             S_ISSOCK(source_stat.st_mode) || S_ISFIFO(source_stat.st_mode) ||
 199             S_ISLNK(source_stat.st_mode)) {
 200
 201                 if (dest_exists) {
 202                         if((flags & FILEUTILS_FORCE) == 0) {
 203                                 fprintf(stderr, "`%s' exists\n", dest);
 204                                 return -1;
 205                         }
 206                         if(unlink(dest) < 0) {
 207                                 bb_perror_msg("unable to remove `%s'", dest);
 208                                 return -1;
 209                         }
 210                 }
 211         } else {
 212                 bb_error_msg("internal error: unrecognized file type");
 213                 return -1;
 214                 }
 215         if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode) ||
 216             S_ISSOCK(source_stat.st_mode)) {
 217                 if (mknod(dest, source_stat.st_mode, source_stat.st_rdev) < 0) {
 218                         bb_perror_msg("unable to create `%s'", dest);
 219                         return -1;
 220                 }
 221         } else if (S_ISFIFO(source_stat.st_mode)) {
 222                 if (mkfifo(dest, source_stat.st_mode) < 0) {
 223                         bb_perror_msg("cannot create fifo `%s'", dest);
 224                         return -1;
 225                 }
 226         } else if (S_ISLNK(source_stat.st_mode)) {
 227                 char *lpath;
 228
 229                 lpath = xreadlink(source);
 230                 if (symlink(lpath, dest) < 0) {
 231                         bb_perror_msg("cannot create symlink `%s'", dest);
 232                         return -1;
 233                 }
 234                 free(lpath);
 235
 236 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
 237                 if (flags & FILEUTILS_PRESERVE_STATUS)
 238                         if (lchown(dest, source_stat.st_uid, source_stat.st_gid) < 0)
 239                                 bb_perror_msg("unable to preserve ownership of `%s'", dest);
 240 #endif
 241
 242 #ifdef CONFIG_FEATURE_PRESERVE_HARDLINKS
 243                 add_to_ino_dev_hashtable(&source_stat, dest);
 244 #endif
 245
 246                 return 0;
 247         }
 248
 249 #ifdef CONFIG_FEATURE_PRESERVE_HARDLINKS
 250         if (! S_ISDIR(source_stat.st_mode)) {
 251                 add_to_ino_dev_hashtable(&source_stat, dest);
 252         }
 253 #endif
 254
 255 end:
 256
 257         if (flags & FILEUTILS_PRESERVE_STATUS) {
 258                 struct utimbuf times;
 259
 260                 times.actime = source_stat.st_atime;
 261                 times.modtime = source_stat.st_mtime;
 262                 if (utime(dest, &times) < 0)
 263                         bb_perror_msg("unable to preserve times of `%s'", dest);
 264                 if (chown(dest, source_stat.st_uid, source_stat.st_gid) < 0) {
 265                         source_stat.st_mode &= ~(S_ISUID | S_ISGID);
 266                         bb_perror_msg("unable to preserve ownership of `%s'", dest);
 267                 }
 268                 if (chmod(dest, source_stat.st_mode) < 0)
 269                         bb_perror_msg("unable to preserve permissions of `%s'", dest);
 270         }
 271
 272         return status;
 273 }