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:     "\n        -f      Don't prompt before overwriting"
  25 //usage:     "\n        -i      Interactive, prompt before overwrite"
  26 //usage:     "\n        -n      Don't overwrite an existing file"
  27 //usage:
  28 //usage:#define mv_example_usage
  29 //usage:       "$ mv /tmp/foo /bin/bar\n"
  30
  31 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  32 static const char mv_longopts[] ALIGN1 =
  33         "interactive\0" No_argument "i"
  34         "force\0"       No_argument "f"
  35         "no-clobber\0"  No_argument "n"
  36         ;
  37 #endif
  38
  39 #define OPT_FILEUTILS_FORCE       1
  40 #define OPT_FILEUTILS_INTERACTIVE 2
  41 #define OPT_FILEUTILS_NOCLOBBER   4
  42
  43 int mv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  44 int mv_main(int argc, char **argv)
  45 {
  46         struct stat dest_stat;
  47         const char *last;
  48         const char *dest;
  49         unsigned flags;
  50         int dest_exists;
  51         int status = 0;
  52         int copy_flag = 0;
  53
  54 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  55         applet_long_options = mv_longopts;
  56 #endif
  57         /* Need at least two arguments.
  58          * If more than one of -f, -i, -n is specified , only the final one
  59          * takes effect (it unsets previous options). */
  60         opt_complementary = "-2:f-in:i-fn:n-fi";
  61         flags = getopt32(argv, "fin");
  62         argc -= optind;
  63         argv += optind;
  64         last = argv[argc - 1];
  65
  66         if (argc == 2) {
  67                 dest_exists = cp_mv_stat(last, &dest_stat);
  68                 if (dest_exists < 0) {
  69                         return EXIT_FAILURE;
  70                 }
  71
  72                 if (!(dest_exists & 2)) { /* last is not a directory */
  73                         dest = last;
  74                         goto DO_MOVE;
  75                 }
  76         }
  77
  78         do {
  79                 dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
  80                 dest_exists = cp_mv_stat(dest, &dest_stat);
  81                 if (dest_exists < 0) {
  82                         goto RET_1;
  83                 }
  84
  85  DO_MOVE:
  86                 if (dest_exists) {
  87                         if (flags & OPT_FILEUTILS_NOCLOBBER)
  88                                 goto RET_0;
  89                         if (!(flags & OPT_FILEUTILS_FORCE)
  90                          && ((access(dest, W_OK) < 0 && isatty(0))
  91                             || (flags & OPT_FILEUTILS_INTERACTIVE))
  92                         ) {
  93                                 if (fprintf(stderr, "mv: overwrite '%s'? ", dest) < 0) {
  94                                         goto RET_1;  /* Ouch! fprintf failed! */
  95                                 }
  96                                 if (!bb_ask_confirmation()) {
  97                                         goto RET_0;
  98                                 }
  99                         }
 100                 }
 101
 102                 if (rename(*argv, dest) < 0) {
 103                         struct stat source_stat;
 104                         int source_exists;
 105
 106                         if (errno != EXDEV
 107                          || (source_exists = cp_mv_stat2(*argv, &source_stat, lstat)) < 1
 108                         ) {
 109                                 bb_perror_msg("can't rename '%s'", *argv);
 110                         } else {
 111                                 static const char fmt[] ALIGN1 =
 112                                         "can't overwrite %sdirectory with %sdirectory";
 113
 114                                 if (dest_exists) {
 115                                         if (dest_exists == 3) {
 116                                                 if (source_exists != 3) {
 117                                                         bb_error_msg(fmt, "", "non-");
 118                                                         goto RET_1;
 119                                                 }
 120                                         } else {
 121                                                 if (source_exists == 3) {
 122                                                         bb_error_msg(fmt, "non-", "");
 123                                                         goto RET_1;
 124                                                 }
 125                                         }
 126                                         if (unlink(dest) < 0) {
 127                                                 bb_perror_msg("can't remove '%s'", dest);
 128                                                 goto RET_1;
 129                                         }
 130                                 }
 131                                 /* FILEUTILS_RECUR also prevents nasties like
 132                                  * "read from device and write contents to dst"
 133                                  * instead of "create same device node" */
 134                                 copy_flag = FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS;
 135 #if ENABLE_SELINUX
 136                                 copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 137 #endif
 138                                 if ((copy_file(*argv, dest, copy_flag) >= 0)
 139                                  && (remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)
 140                                 ) {
 141                                         goto RET_0;
 142                                 }
 143                         }
 144  RET_1:
 145                         status = 1;
 146                 }
 147  RET_0:
 148                 if (dest != last) {
 149                         free((void *) dest);
 150                 }
 151         } while (*++argv != last);
 152
 153         return status;
 154 }