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-$(CONFIG_MV) += mv.o
  24
  25 //usage:#define mv_trivial_usage
  26 //usage:       "[-finT] SOURCE DEST\n"
  27 //usage:       "or: mv [-fin] SOURCE... { -t DIRECTORY | DIRECTORY }"
  28 //usage:#define mv_full_usage "\n\n"
  29 //usage:       "Rename SOURCE to DEST, or move SOURCEs to DIRECTORY\n"
  30 //usage:     "\n        -f      Don't prompt before overwriting"
  31 //usage:     "\n        -i      Interactive, prompt before overwrite"
  32 //usage:     "\n        -n      Don't overwrite an existing file"
  33 //usage:     "\n        -T      Refuse to move if DEST is a directory"
  34 //usage:     "\n        -t DIR  Move all SOURCEs into DIR"
  35 //usage:
  36 //usage:#define mv_example_usage
  37 //usage:       "$ mv /tmp/foo /bin/bar\n"
  38
  39 #include "libbb.h"
  40 #include "libcoreutils/coreutils.h"
  41
  42 int mv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  43 int mv_main(int argc, char **argv)
  44 {
  45         struct stat statbuf;
  46         const char *last;
  47         const char *dest;
  48         unsigned flags;
  49         int dest_exists;
  50         int status = 0;
  51         int copy_flag = 0;
  52
  53 #define OPT_FORCE       (1 << 0)
  54 #define OPT_INTERACTIVE (1 << 1)
  55 #define OPT_NOCLOBBER   (1 << 2)
  56 #define OPT_DESTNOTDIR  (1 << 3)
  57 #define OPT_DESTDIR     (1 << 4)
  58 #define OPT_VERBOSE     ((1 << 5) * ENABLE_FEATURE_VERBOSE)
  59         flags = getopt32long(argv, "^"
  60                         "finTt:v"
  61                         "\0"
  62         /* At least one argument. (Usually two+, but -t DIR can have only one) */
  63                         "-1"
  64         /* only the final one of -f, -i, -n takes effect */
  65                         ":f-in:i-fn:n-fi"
  66         /* -t and -T don't mix */
  67                         ":t--T:T--t",
  68                         "interactive\0" No_argument "i"
  69                         "force\0"       No_argument "f"
  70                         "no-clobber\0"  No_argument "n"
  71                         "no-target-directory\0" No_argument "T"
  72                         "target-directory\0" Required_argument "t"
  73                         IF_FEATURE_VERBOSE(
  74                         "verbose\0"     No_argument "v"
  75                         )
  76                         , &last
  77         );
  78         argc -= optind;
  79         argv += optind;
  80
  81         if (!(flags & OPT_DESTDIR)) {
  82                 last = argv[argc - 1];
  83                 if (argc < 2)
  84                         bb_show_usage();
  85                 if (argc != 2) {
  86                         if (flags & OPT_DESTNOTDIR)
  87                                 bb_show_usage();
  88                         /* "mv A B C... DIR" - target must be dir */
  89                 } else /* argc == 2 */ {
  90                         /* "mv A B" - only case where target can be not a dir */
  91                         dest_exists = cp_mv_stat(last, &statbuf);
  92                         if (dest_exists < 0) { /* error other than ENOENT */
  93                                 return EXIT_FAILURE;
  94                         }
  95                         if (!(dest_exists & 2)) {
  96                                 /* last is not a directory */
  97                                 dest = last;
  98                                 goto DO_MOVE;
  99                         }
 100                         /* last is a directory */
 101                         if (flags & OPT_DESTNOTDIR) {
 102                                 if (stat(argv[0], &statbuf) == 0 && !S_ISDIR(statbuf.st_mode))
 103                                         bb_error_msg_and_die("'%s' is a directory", last);
 104                                 /* "mv -T DIR1 DIR2" is allowed (renames a dir) */
 105                                 dest = last;
 106                                 goto DO_MOVE;
 107                         }
 108                         /* else: fall through into "do { move SRC to DIR/SRC } while" loop */
 109                 }
 110         }
 111         /* else: last is DIR from "-t DIR" */
 112
 113         do {
 114                 dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
 115                 dest_exists = cp_mv_stat(dest, &statbuf);
 116                 if (dest_exists < 0) {
 117                         goto RET_1;
 118                 }
 119
 120  DO_MOVE:
 121                 if (dest_exists) {
 122                         if (flags & OPT_NOCLOBBER)
 123                                 goto RET_0;
 124                         if (!(flags & OPT_FORCE)
 125                          && ((access(dest, W_OK) < 0 && isatty(0))
 126                             || (flags & OPT_INTERACTIVE))
 127                         ) {
 128                                 if (fprintf(stderr, "mv: overwrite '%s'? ", dest) < 0) {
 129                                         goto RET_1;  /* Ouch! fprintf failed! */
 130                                 }
 131                                 if (!bb_ask_y_confirmation()) {
 132                                         goto RET_0;
 133                                 }
 134                         }
 135                 }
 136
 137                 if (rename(*argv, dest) < 0) {
 138                         int source_exists;
 139
 140                         if (errno != EXDEV
 141                          || (source_exists = cp_mv_stat2(*argv, &statbuf, lstat)) < 1
 142                         ) {
 143                                 bb_perror_msg("can't rename '%s'", *argv);
 144                         } else {
 145                                 static const char fmt[] ALIGN1 =
 146                                         "can't overwrite %sdirectory with %sdirectory";
 147
 148                                 if (dest_exists) {
 149                                         if (dest_exists == 3) {
 150                                                 if (source_exists != 3) {
 151                                                         bb_error_msg(fmt, "", "non-");
 152                                                         goto RET_1;
 153                                                 }
 154                                         } else {
 155                                                 if (source_exists == 3) {
 156                                                         bb_error_msg(fmt, "non-", "");
 157                                                         goto RET_1;
 158                                                 }
 159                                         }
 160                                         if (unlink(dest) < 0) {
 161                                                 bb_perror_msg("can't remove '%s'", dest);
 162                                                 goto RET_1;
 163                                         }
 164                                 }
 165                                 /* FILEUTILS_RECUR also prevents nasties like
 166                                  * "read from device and write contents to dst"
 167                                  * instead of "create same device node" */
 168                                 copy_flag = FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS;
 169 #if ENABLE_SELINUX
 170                                 copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 171 #endif
 172                                 if ((copy_file(*argv, dest, copy_flag) >= 0)
 173                                  && (remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)
 174                                 ) {
 175                                         goto RET_0;
 176                                 }
 177                         }
 178  RET_1:
 179                         status = 1;
 180                 }
 181  RET_0:
 182                 if (flags & OPT_VERBOSE) {
 183                         printf("'%s' -> '%s'\n", *argv, dest);
 184                 }
 185                 if (dest != last) {
 186                         free((void *) dest);
 187                 }
 188         } while (*++argv && *argv != last);
 189
 190         return status;
 191 }