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 tarball for details.
   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 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  20 static const char mv_longopts[] ALIGN1 =
  21         "interactive\0" No_argument "i"
  22         "force\0"       No_argument "f"
  23         ;
  24 #endif
  25
  26 #define OPT_FILEUTILS_FORCE       1
  27 #define OPT_FILEUTILS_INTERACTIVE 2
  28
  29 int mv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  30 int mv_main(int argc, char **argv)
  31 {
  32         struct stat dest_stat;
  33         const char *last;
  34         const char *dest;
  35         unsigned flags;
  36         int dest_exists;
  37         int status = 0;
  38         int copy_flag = 0;
  39
  40 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  41         applet_long_options = mv_longopts;
  42 #endif
  43         // Need at least two arguments
  44         // -f unsets -i, -i unsets -f
  45         opt_complementary = "-2:f-i:i-f";
  46         flags = getopt32(argv, "fi");
  47         argc -= optind;
  48         argv += optind;
  49         last = argv[argc - 1];
  50
  51         if (argc == 2) {
  52                 dest_exists = cp_mv_stat(last, &dest_stat);
  53                 if (dest_exists < 0) {
  54                         return EXIT_FAILURE;
  55                 }
  56
  57                 if (!(dest_exists & 2)) { /* last is not a directory */
  58                         dest = last;
  59                         goto DO_MOVE;
  60                 }
  61         }
  62
  63         do {
  64                 dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
  65                 dest_exists = cp_mv_stat(dest, &dest_stat);
  66                 if (dest_exists < 0) {
  67                         goto RET_1;
  68                 }
  69
  70  DO_MOVE:
  71                 if (dest_exists
  72                  && !(flags & OPT_FILEUTILS_FORCE)
  73                  && ((access(dest, W_OK) < 0 && isatty(0))
  74                     || (flags & OPT_FILEUTILS_INTERACTIVE))
  75                 ) {
  76                         if (fprintf(stderr, "mv: overwrite '%s'? ", dest) < 0) {
  77                                 goto RET_1;     /* Ouch! fprintf failed! */
  78                         }
  79                         if (!bb_ask_confirmation()) {
  80                                 goto RET_0;
  81                         }
  82                 }
  83                 if (rename(*argv, dest) < 0) {
  84                         struct stat source_stat;
  85                         int source_exists;
  86
  87                         if (errno != EXDEV
  88                          || (source_exists = cp_mv_stat2(*argv, &source_stat, lstat)) < 1
  89                         ) {
  90                                 bb_perror_msg("cannot rename '%s'", *argv);
  91                         } else {
  92                                 static const char fmt[] ALIGN1 =
  93                                         "cannot overwrite %sdirectory with %sdirectory";
  94
  95                                 if (dest_exists) {
  96                                         if (dest_exists == 3) {
  97                                                 if (source_exists != 3) {
  98                                                         bb_error_msg(fmt, "", "non-");
  99                                                         goto RET_1;
 100                                                 }
 101                                         } else {
 102                                                 if (source_exists == 3) {
 103                                                         bb_error_msg(fmt, "non-", "");
 104                                                         goto RET_1;
 105                                                 }
 106                                         }
 107                                         if (unlink(dest) < 0) {
 108                                                 bb_perror_msg("cannot remove '%s'", dest);
 109                                                 goto RET_1;
 110                                         }
 111                                 }
 112                                 /* FILEUTILS_RECUR also prevents nasties like
 113                                  * "read from device and write contents to dst"
 114                                  * instead of "create same device node" */
 115                                 copy_flag = FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS;
 116 #if ENABLE_SELINUX
 117                                 copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 118 #endif
 119                                 if ((copy_file(*argv, dest, copy_flag) >= 0)
 120                                  && (remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)
 121                                 ) {
 122                                         goto RET_0;
 123                                 }
 124                         }
 125  RET_1:
 126                         status = 1;
 127                 }
 128  RET_0:
 129                 if (dest != last) {
 130                         free((void *) dest);
 131                 }
 132         } while (*++argv != last);
 133
 134         return status;
 135 }