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"
  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 //config:       help
  25 //config:         Support long options for the mv applet.
  26
  27 //applet:IF_MV(APPLET(mv, BB_DIR_BIN, BB_SUID_DROP))
  28
  29 //kbuild:lib-$(CONFIG_MV) += mv.o
  30
  31 //usage:#define mv_trivial_usage
  32 //usage:       "[-fin] SOURCE DEST\n"
  33 //usage:       "or: mv [-fin] SOURCE... DIRECTORY"
  34 //usage:#define mv_full_usage "\n\n"
  35 //usage:       "Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY\n"
  36 //usage:     "\n        -f      Don't prompt before overwriting"
  37 //usage:     "\n        -i      Interactive, prompt before overwrite"
  38 //usage:     "\n        -n      Don't overwrite an existing file"
  39 //usage:
  40 //usage:#define mv_example_usage
  41 //usage:       "$ mv /tmp/foo /bin/bar\n"
  42
  43 #include "libbb.h"
  44 #include "libcoreutils/coreutils.h"
  45
  46 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  47 static const char mv_longopts[] ALIGN1 =
  48         "interactive\0" No_argument "i"
  49         "force\0"       No_argument "f"
  50         "no-clobber\0"  No_argument "n"
  51         IF_FEATURE_VERBOSE(
  52         "verbose\0"     No_argument "v"
  53         )
  54         ;
  55 #endif
  56
  57 #define OPT_FORCE       (1 << 0)
  58 #define OPT_INTERACTIVE (1 << 1)
  59 #define OPT_NOCLOBBER   (1 << 2)
  60 #define OPT_VERBOSE     ((1 << 3) * ENABLE_FEATURE_VERBOSE)
  61
  62
  63 int mv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  64 int mv_main(int argc, char **argv)
  65 {
  66         struct stat dest_stat;
  67         const char *last;
  68         const char *dest;
  69         unsigned flags;
  70         int dest_exists;
  71         int status = 0;
  72         int copy_flag = 0;
  73
  74 #if ENABLE_FEATURE_MV_LONG_OPTIONS
  75         applet_long_options = mv_longopts;
  76 #endif
  77         /* Need at least two arguments.
  78          * If more than one of -f, -i, -n is specified , only the final one
  79          * takes effect (it unsets previous options).
  80          */
  81         opt_complementary = "-2:f-in:i-fn:n-fi";
  82         flags = getopt32(argv, "finv");
  83         argc -= optind;
  84         argv += optind;
  85         last = argv[argc - 1];
  86
  87         if (argc == 2) {
  88                 dest_exists = cp_mv_stat(last, &dest_stat);
  89                 if (dest_exists < 0) {
  90                         return EXIT_FAILURE;
  91                 }
  92
  93                 if (!(dest_exists & 2)) { /* last is not a directory */
  94                         dest = last;
  95                         goto DO_MOVE;
  96                 }
  97         }
  98
  99         do {
 100                 dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
 101                 dest_exists = cp_mv_stat(dest, &dest_stat);
 102                 if (dest_exists < 0) {
 103                         goto RET_1;
 104                 }
 105
 106  DO_MOVE:
 107                 if (dest_exists) {
 108                         if (flags & OPT_NOCLOBBER)
 109                                 goto RET_0;
 110                         if (!(flags & OPT_FORCE)
 111                          && ((access(dest, W_OK) < 0 && isatty(0))
 112                             || (flags & OPT_INTERACTIVE))
 113                         ) {
 114                                 if (fprintf(stderr, "mv: overwrite '%s'? ", dest) < 0) {
 115                                         goto RET_1;  /* Ouch! fprintf failed! */
 116                                 }
 117                                 if (!bb_ask_confirmation()) {
 118                                         goto RET_0;
 119                                 }
 120                         }
 121                 }
 122
 123                 if (rename(*argv, dest) < 0) {
 124                         struct stat source_stat;
 125                         int source_exists;
 126
 127                         if (errno != EXDEV
 128                          || (source_exists = cp_mv_stat2(*argv, &source_stat, lstat)) < 1
 129                         ) {
 130                                 bb_perror_msg("can't rename '%s'", *argv);
 131                         } else {
 132                                 static const char fmt[] ALIGN1 =
 133                                         "can't overwrite %sdirectory with %sdirectory";
 134
 135                                 if (dest_exists) {
 136                                         if (dest_exists == 3) {
 137                                                 if (source_exists != 3) {
 138                                                         bb_error_msg(fmt, "", "non-");
 139                                                         goto RET_1;
 140                                                 }
 141                                         } else {
 142                                                 if (source_exists == 3) {
 143                                                         bb_error_msg(fmt, "non-", "");
 144                                                         goto RET_1;
 145                                                 }
 146                                         }
 147                                         if (unlink(dest) < 0) {
 148                                                 bb_perror_msg("can't remove '%s'", dest);
 149                                                 goto RET_1;
 150                                         }
 151                                 }
 152                                 /* FILEUTILS_RECUR also prevents nasties like
 153                                  * "read from device and write contents to dst"
 154                                  * instead of "create same device node" */
 155                                 copy_flag = FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS;
 156 #if ENABLE_SELINUX
 157                                 copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 158 #endif
 159                                 if ((copy_file(*argv, dest, copy_flag) >= 0)
 160                                  && (remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)
 161                                 ) {
 162                                         goto RET_0;
 163                                 }
 164                         }
 165  RET_1:
 166                         status = 1;
 167                 }
 168  RET_0:
 169                 if (flags & OPT_VERBOSE) {
 170                         printf("'%s' -> '%s'\n", *argv, dest);
 171                 }
 172                 if (dest != last) {
 173                         free((void *) dest);
 174                 }
 175         } while (*++argv != last);
 176
 177         return status;
 178 }