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 (10 kb)"
  16 //config:       default y
  17 //config:       help
  18 //config:       mv is used to move or rename files or directories.
  19
  20 //applet:IF_MV(APPLET_NOEXEC(mv, mv, BB_DIR_BIN, BB_SUID_DROP, mv))
  21 /* NOEXEC despite cases when it can be a "runner" (mv LARGE_DIR OTHER_FS) */
  22
  23 //kbuild:lib-$(CONFIG_MV) += mv.o
  24
  25 //usage:#define mv_trivial_usage
  26 //usage:       "[-fin] SOURCE DEST\n"
  27 //usage:       "or: mv [-fin] SOURCE... DIRECTORY"
  28 //usage:#define mv_full_usage "\n\n"
  29 //usage:       "Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY\n"
  30 //usage:     "\n        -f      Don't prompt before overwriting"
  31 //usage:     "\n        -i      Interactive, prompt before overwrite"
  32 //usage:     "\n        -n      Don't overwrite an existing file"
  33 //usage:
  34 //usage:#define mv_example_usage
  35 //usage:       "$ mv /tmp/foo /bin/bar\n"
  36
  37 #include "libbb.h"
  38 #include "libcoreutils/coreutils.h"
  39
  40 int mv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  41 int mv_main(int argc, char **argv)
  42 {
  43         struct stat dest_stat;
  44         const char *last;
  45         const char *dest;
  46         unsigned flags;
  47         int dest_exists;
  48         int status = 0;
  49         int copy_flag = 0;
  50
  51 #define OPT_FORCE       (1 << 0)
  52 #define OPT_INTERACTIVE (1 << 1)
  53 #define OPT_NOCLOBBER   (1 << 2)
  54 #define OPT_VERBOSE     ((1 << 3) * ENABLE_FEATURE_VERBOSE)
  55         /* Need at least two arguments.
  56          * If more than one of -f, -i, -n is specified , only the final one
  57          * takes effect (it unsets previous options).
  58          */
  59         flags = getopt32long(argv, "^"
  60                         "finv"
  61                         "\0"
  62                         "-2:f-in:i-fn:n-fi",
  63                         "interactive\0" No_argument "i"
  64                         "force\0"       No_argument "f"
  65                         "no-clobber\0"  No_argument "n"
  66                         IF_FEATURE_VERBOSE(
  67                         "verbose\0"     No_argument "v"
  68                         )
  69         );
  70         argc -= optind;
  71         argv += optind;
  72         last = argv[argc - 1];
  73
  74         if (argc == 2) {
  75                 dest_exists = cp_mv_stat(last, &dest_stat);
  76                 if (dest_exists < 0) {
  77                         return EXIT_FAILURE;
  78                 }
  79
  80                 if (!(dest_exists & 2)) { /* last is not a directory */
  81                         dest = last;
  82                         goto DO_MOVE;
  83                 }
  84         }
  85
  86         do {
  87                 dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
  88                 dest_exists = cp_mv_stat(dest, &dest_stat);
  89                 if (dest_exists < 0) {
  90                         goto RET_1;
  91                 }
  92
  93  DO_MOVE:
  94                 if (dest_exists) {
  95                         if (flags & OPT_NOCLOBBER)
  96                                 goto RET_0;
  97                         if (!(flags & OPT_FORCE)
  98                          && ((access(dest, W_OK) < 0 && isatty(0))
  99                             || (flags & OPT_INTERACTIVE))
 100                         ) {
 101                                 if (fprintf(stderr, "mv: overwrite '%s'? ", dest) < 0) {
 102                                         goto RET_1;  /* Ouch! fprintf failed! */
 103                                 }
 104                                 if (!bb_ask_y_confirmation()) {
 105                                         goto RET_0;
 106                                 }
 107                         }
 108                 }
 109
 110                 if (rename(*argv, dest) < 0) {
 111                         struct stat source_stat;
 112                         int source_exists;
 113
 114                         if (errno != EXDEV
 115                          || (source_exists = cp_mv_stat2(*argv, &source_stat, lstat)) < 1
 116                         ) {
 117                                 bb_perror_msg("can't rename '%s'", *argv);
 118                         } else {
 119                                 static const char fmt[] ALIGN1 =
 120                                         "can't overwrite %sdirectory with %sdirectory";
 121
 122                                 if (dest_exists) {
 123                                         if (dest_exists == 3) {
 124                                                 if (source_exists != 3) {
 125                                                         bb_error_msg(fmt, "", "non-");
 126                                                         goto RET_1;
 127                                                 }
 128                                         } else {
 129                                                 if (source_exists == 3) {
 130                                                         bb_error_msg(fmt, "non-", "");
 131                                                         goto RET_1;
 132                                                 }
 133                                         }
 134                                         if (unlink(dest) < 0) {
 135                                                 bb_perror_msg("can't remove '%s'", dest);
 136                                                 goto RET_1;
 137                                         }
 138                                 }
 139                                 /* FILEUTILS_RECUR also prevents nasties like
 140                                  * "read from device and write contents to dst"
 141                                  * instead of "create same device node" */
 142                                 copy_flag = FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS;
 143 #if ENABLE_SELINUX
 144                                 copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 145 #endif
 146                                 if ((copy_file(*argv, dest, copy_flag) >= 0)
 147                                  && (remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)
 148                                 ) {
 149                                         goto RET_0;
 150                                 }
 151                         }
 152  RET_1:
 153                         status = 1;
 154                 }
 155  RET_0:
 156                 if (flags & OPT_VERBOSE) {
 157                         printf("'%s' -> '%s'\n", *argv, dest);
 158                 }
 159                 if (dest != last) {
 160                         free((void *) dest);
 161                 }
 162         } while (*++argv != last);
 163
 164         return status;
 165 }