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 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  11  *
  12  * Size reduction and improved error checking.
  13  */
  14 //config:config MV
  15 //config:       bool "mv (9.8 kb)"
  16 //config:       default y
  17 //config:       help
  18 //config:       mv is used to move or rename files or directories.
  19 //config:
  20 //config:config FEATURE_MV_LONG_OPTIONS
  21 //config:       bool "Enable long options"
  22 //config:       default y
  23 //config:       depends on MV && LONG_OPTS
  24
  25 //applet:IF_MV(APPLET(mv, BB_DIR_BIN, BB_SUID_DROP))
  26
  27 //kbuild:lib-$(CONFIG_MV) += mv.o
  28
  29 //usage:#define mv_trivial_usage
  30 //usage:       "[-fin] SOURCE DEST\n"
  31 //usage:       "or: mv [-fin] SOURCE... DIRECTORY"
  32 //usage:#define mv_full_usage "\n\n"
  33 //usage:       "Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY\n"
  34 //usage:     "\n        -f      Don't prompt before overwriting"
  35 //usage:     "\n        -i      Interactive, prompt before overwrite"
  36 //usage:     "\n        -n      Don't overwrite an existing file"
  37 //usage:
  38 //usage:#define mv_example_usage
  39 //usage:       "$ mv /tmp/foo /bin/bar\n"
  40
  41 #include "libbb.h"
  42 #include "libcoreutils/coreutils.h"
  43
  44 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  45 static const char mv_longopts[] ALIGN1 =
  46         "interactive\0" No_argument "i"
  47         "force\0"       No_argument "f"
  48         "no-clobber\0"  No_argument "n"
  49         IF_FEATURE_VERBOSE(
  50         "verbose\0"     No_argument "v"
  51         )
  52         ;
  53 #endif
  54
  55 #define OPT_FORCE       (1 << 0)
  56 #define OPT_INTERACTIVE (1 << 1)
  57 #define OPT_NOCLOBBER   (1 << 2)
  58 #define OPT_VERBOSE     ((1 << 3) * ENABLE_FEATURE_VERBOSE)
  59
  60
  61 int mv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  62 int mv_main(int argc, char **argv)
  63 {
  64         struct stat dest_stat;
  65         const char *last;
  66         const char *dest;
  67         unsigned flags;
  68         int dest_exists;
  69         int status = 0;
  70         int copy_flag = 0;
  71
  72 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  73         applet_long_options = mv_longopts;
  74 #endif
  75         /* Need at least two arguments.
  76          * If more than one of -f, -i, -n is specified , only the final one
  77          * takes effect (it unsets previous options).
  78          */
  79         opt_complementary = "-2:f-in:i-fn:n-fi";
  80         flags = getopt32(argv, "finv");
  81         argc -= optind;
  82         argv += optind;
  83         last = argv[argc - 1];
  84
  85         if (argc == 2) {
  86                 dest_exists = cp_mv_stat(last, &dest_stat);
  87                 if (dest_exists < 0) {
  88                         return EXIT_FAILURE;
  89                 }
  90
  91                 if (!(dest_exists & 2)) { /* last is not a directory */
  92                         dest = last;
  93                         goto DO_MOVE;
  94                 }
  95         }
  96
  97         do {
  98                 dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
  99                 dest_exists = cp_mv_stat(dest, &dest_stat);
 100                 if (dest_exists < 0) {
 101                         goto RET_1;
 102                 }
 103
 104  DO_MOVE:
 105                 if (dest_exists) {
 106                         if (flags & OPT_NOCLOBBER)
 107                                 goto RET_0;
 108                         if (!(flags & OPT_FORCE)
 109                          && ((access(dest, W_OK) < 0 && isatty(0))
 110                             || (flags & OPT_INTERACTIVE))
 111                         ) {
 112                                 if (fprintf(stderr, "mv: overwrite '%s'? ", dest) < 0) {
 113                                         goto RET_1;  /* Ouch! fprintf failed! */
 114                                 }
 115                                 if (!bb_ask_confirmation()) {
 116                                         goto RET_0;
 117                                 }
 118                         }
 119                 }
 120
 121                 if (rename(*argv, dest) < 0) {
 122                         struct stat source_stat;
 123                         int source_exists;
 124
 125                         if (errno != EXDEV
 126                          || (source_exists = cp_mv_stat2(*argv, &source_stat, lstat)) < 1
 127                         ) {
 128                                 bb_perror_msg("can't rename '%s'", *argv);
 129                         } else {
 130                                 static const char fmt[] ALIGN1 =
 131                                         "can't overwrite %sdirectory with %sdirectory";
 132
 133                                 if (dest_exists) {
 134                                         if (dest_exists == 3) {
 135                                                 if (source_exists != 3) {
 136                                                         bb_error_msg(fmt, "", "non-");
 137                                                         goto RET_1;
 138                                                 }
 139                                         } else {
 140                                                 if (source_exists == 3) {
 141                                                         bb_error_msg(fmt, "non-", "");
 142                                                         goto RET_1;
 143                                                 }
 144                                         }
 145                                         if (unlink(dest) < 0) {
 146                                                 bb_perror_msg("can't remove '%s'", dest);
 147                                                 goto RET_1;
 148                                         }
 149                                 }
 150                                 /* FILEUTILS_RECUR also prevents nasties like
 151                                  * "read from device and write contents to dst"
 152                                  * instead of "create same device node" */
 153                                 copy_flag = FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS;
 154 #if ENABLE_SELINUX
 155                                 copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 156 #endif
 157                                 if ((copy_file(*argv, dest, copy_flag) >= 0)
 158                                  && (remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)
 159                                 ) {
 160                                         goto RET_0;
 161                                 }
 162                         }
 163  RET_1:
 164                         status = 1;
 165                 }
 166  RET_0:
 167                 if (flags & OPT_VERBOSE) {
 168                         printf("'%s' -> '%s'\n", *argv, dest);
 169                 }
 170                 if (dest != last) {
 171                         free((void *) dest);
 172                 }
 173         } while (*++argv != last);
 174
 175         return status;
 176 }