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         IF_FEATURE_VERBOSE(
  37         "verbose\0"     No_argument "v"
  38         )
  39         ;
  40 #endif
  41
  42 #define OPT_FORCE       (1 << 0)
  43 #define OPT_INTERACTIVE (1 << 1)
  44 #define OPT_NOCLOBBER   (1 << 2)
  45 #define OPT_VERBOSE     ((1 << 3) * ENABLE_FEATURE_VERBOSE)
  46
  47
  48 int mv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  49 int mv_main(int argc, char **argv)
  50 {
  51         struct stat dest_stat;
  52         const char *last;
  53         const char *dest;
  54         unsigned flags;
  55         int dest_exists;
  56         int status = 0;
  57         int copy_flag = 0;
  58
  59 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  60         applet_long_options = mv_longopts;
  61 #endif
  62         /* Need at least two arguments.
  63          * If more than one of -f, -i, -n is specified , only the final one
  64          * takes effect (it unsets previous options).
  65          */
  66         opt_complementary = "-2:f-in:i-fn:n-fi";
  67         flags = getopt32(argv, "finv");
  68         argc -= optind;
  69         argv += optind;
  70         last = argv[argc - 1];
  71
  72         if (argc == 2) {
  73                 dest_exists = cp_mv_stat(last, &dest_stat);
  74                 if (dest_exists < 0) {
  75                         return EXIT_FAILURE;
  76                 }
  77
  78                 if (!(dest_exists & 2)) { /* last is not a directory */
  79                         dest = last;
  80                         goto DO_MOVE;
  81                 }
  82         }
  83
  84         do {
  85                 dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
  86                 dest_exists = cp_mv_stat(dest, &dest_stat);
  87                 if (dest_exists < 0) {
  88                         goto RET_1;
  89                 }
  90
  91  DO_MOVE:
  92                 if (dest_exists) {
  93                         if (flags & OPT_NOCLOBBER)
  94                                 goto RET_0;
  95                         if (!(flags & OPT_FORCE)
  96                          && ((access(dest, W_OK) < 0 && isatty(0))
  97                             || (flags & OPT_INTERACTIVE))
  98                         ) {
  99                                 if (fprintf(stderr, "mv: overwrite '%s'? ", dest) < 0) {
 100                                         goto RET_1;  /* Ouch! fprintf failed! */
 101                                 }
 102                                 if (!bb_ask_confirmation()) {
 103                                         goto RET_0;
 104                                 }
 105                         }
 106                 }
 107
 108                 if (rename(*argv, dest) < 0) {
 109                         struct stat source_stat;
 110                         int source_exists;
 111
 112                         if (errno != EXDEV
 113                          || (source_exists = cp_mv_stat2(*argv, &source_stat, lstat)) < 1
 114                         ) {
 115                                 bb_perror_msg("can't rename '%s'", *argv);
 116                         } else {
 117                                 static const char fmt[] ALIGN1 =
 118                                         "can't overwrite %sdirectory with %sdirectory";
 119
 120                                 if (dest_exists) {
 121                                         if (dest_exists == 3) {
 122                                                 if (source_exists != 3) {
 123                                                         bb_error_msg(fmt, "", "non-");
 124                                                         goto RET_1;
 125                                                 }
 126                                         } else {
 127                                                 if (source_exists == 3) {
 128                                                         bb_error_msg(fmt, "non-", "");
 129                                                         goto RET_1;
 130                                                 }
 131                                         }
 132                                         if (unlink(dest) < 0) {
 133                                                 bb_perror_msg("can't remove '%s'", dest);
 134                                                 goto RET_1;
 135                                         }
 136                                 }
 137                                 /* FILEUTILS_RECUR also prevents nasties like
 138                                  * "read from device and write contents to dst"
 139                                  * instead of "create same device node" */
 140                                 copy_flag = FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS;
 141 #if ENABLE_SELINUX
 142                                 copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 143 #endif
 144                                 if ((copy_file(*argv, dest, copy_flag) >= 0)
 145                                  && (remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)
 146                                 ) {
 147                                         goto RET_0;
 148                                 }
 149                         }
 150  RET_1:
 151                         status = 1;
 152                 }
 153  RET_0:
 154                 if (flags & OPT_VERBOSE) {
 155                         printf("'%s' -> '%s'\n", *argv, dest);
 156                 }
 157                 if (dest != last) {
 158                         free((void *) dest);
 159                 }
 160         } while (*++argv != last);
 161
 162         return status;
 163 }