release/src/router/busybox/coreutils/mv.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini mv implementation for busybox
   4  *
   5  * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
   6  * SELinux support by Yuichi Nakamura <ynakam@hitachisoft.jp>
   7  *
   8  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   9  */
  10
  11 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  12  *
  13  * Size reduction and improved error checking.
  14  */
  15
  16 #include "libbb.h"
  17 #include "libcoreutils/coreutils.h"
  18
  19 //usage:#define mv_trivial_usage
  20 //usage:       "[-fin] SOURCE DEST\n"
  21 //usage:       "or: mv [-fin] SOURCE... DIRECTORY"
  22 //usage:#define mv_full_usage "\n\n"
  23 //usage:       "Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY\n"
  24 //usage:     "\nOptions:"
  25 //usage:     "\n        -f      Don't prompt before overwriting"
  26 //usage:     "\n        -i      Interactive, prompt before overwrite"
  27 //usage:     "\n        -n      Don't overwrite an existing file"
  28 //usage:
  29 //usage:#define mv_example_usage
  30 //usage:       "$ mv /tmp/foo /bin/bar\n"
  31
  32 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  33 static const char mv_longopts[] ALIGN1 =
  34         "interactive\0" No_argument "i"
  35         "force\0"       No_argument "f"
  36         "no-clobber\0"  No_argument "n"
  37         ;
  38 #endif
  39
  40 #define OPT_FILEUTILS_FORCE       1
  41 #define OPT_FILEUTILS_INTERACTIVE 2
  42 #define OPT_FILEUTILS_NOCLOBBER   4
  43
  44 int mv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  45 int mv_main(int argc, char **argv)
  46 {
  47         struct stat dest_stat;
  48         const char *last;
  49         const char *dest;
  50         unsigned flags;
  51         int dest_exists;
  52         int status = 0;
  53         int copy_flag = 0;
  54
  55 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  56         applet_long_options = mv_longopts;
  57 #endif
  58         /* Need at least two arguments.
  59          * If more than one of -f, -i, -n is specified , only the final one
  60          * takes effect (it unsets previous options). */
  61         opt_complementary = "-2:f-in:i-fn:n-fi";
  62         flags = getopt32(argv, "fin");
  63         argc -= optind;
  64         argv += optind;
  65         last = argv[argc - 1];
  66
  67         if (argc == 2) {
  68                 dest_exists = cp_mv_stat(last, &dest_stat);
  69                 if (dest_exists < 0) {
  70                         return EXIT_FAILURE;
  71                 }
  72
  73                 if (!(dest_exists & 2)) { /* last is not a directory */
  74                         dest = last;
  75                         goto DO_MOVE;
  76                 }
  77         }
  78
  79         do {
  80                 dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
  81                 dest_exists = cp_mv_stat(dest, &dest_stat);
  82                 if (dest_exists < 0) {
  83                         goto RET_1;
  84                 }
  85
  86  DO_MOVE:
  87                 if (dest_exists) {
  88                         if (flags & OPT_FILEUTILS_NOCLOBBER)
  89                                 goto RET_0;
  90                         if (!(flags & OPT_FILEUTILS_FORCE)
  91                          && ((access(dest, W_OK) < 0 && isatty(0))
  92                             || (flags & OPT_FILEUTILS_INTERACTIVE))
  93                         ) {
  94                                 if (fprintf(stderr, "mv: overwrite '%s'? ", dest) < 0) {
  95                                         goto RET_1;  /* Ouch! fprintf failed! */
  96                                 }
  97                                 if (!bb_ask_confirmation()) {
  98                                         goto RET_0;
  99                                 }
 100                         }
 101                 }
 102
 103                 if (rename(*argv, dest) < 0) {
 104                         struct stat source_stat;
 105                         int source_exists;
 106
 107                         if (errno != EXDEV
 108                          || (source_exists = cp_mv_stat2(*argv, &source_stat, lstat)) < 1
 109                         ) {
 110                                 bb_perror_msg("can't rename '%s'", *argv);
 111                         } else {
 112                                 static const char fmt[] ALIGN1 =
 113                                         "can't overwrite %sdirectory with %sdirectory";
 114
 115                                 if (dest_exists) {
 116                                         if (dest_exists == 3) {
 117                                                 if (source_exists != 3) {
 118                                                         bb_error_msg(fmt, "", "non-");
 119                                                         goto RET_1;
 120                                                 }
 121                                         } else {
 122                                                 if (source_exists == 3) {
 123                                                         bb_error_msg(fmt, "non-", "");
 124                                                         goto RET_1;
 125                                                 }
 126                                         }
 127                                         if (unlink(dest) < 0) {
 128                                                 bb_perror_msg("can't remove '%s'", dest);
 129                                                 goto RET_1;
 130                                         }
 131                                 }
 132                                 /* FILEUTILS_RECUR also prevents nasties like
 133                                  * "read from device and write contents to dst"
 134                                  * instead of "create same device node" */
 135                                 copy_flag = FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS;
 136 #if ENABLE_SELINUX
 137                                 copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 138 #endif
 139                                 if ((copy_file(*argv, dest, copy_flag) >= 0)
 140                                  && (remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)
 141                                 ) {
 142                                         goto RET_0;
 143                                 }
 144                         }
 145  RET_1:
 146                         status = 1;
 147                 }
 148  RET_0:
 149                 if (dest != last) {
 150                         free((void *) dest);
 151                 }
 152         } while (*++argv != last);
 153
 154         return status;
 155 }