coreutils/du.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini du implementation for busybox
   4  *
   5  * Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu
   6  * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
   7  * Copyright (C) 2002  Edward Betts <edward@debian.org>
   8  *
   9  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  10  */
  11 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  12  *
  13  * Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
  14  * 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
  15  *    The -d option allows setting of max depth (similar to gnu --max-depth).
  16  * 2) Fixed incorrect size calculations for links and directories, especially
  17  *    when errors occurred.  Calculates sizes should now match gnu du output.
  18  * 3) Added error checking of output.
  19  * 4) Fixed busybox bug #1284 involving long overflow with human_readable.
  20  */
  21 //config:config DU
  22 //config:       bool "du (default blocksize of 512 bytes)"
  23 //config:       default y
  24 //config:       help
  25 //config:       du is used to report the amount of disk space used
  26 //config:       for specified files.
  27 //config:
  28 //config:config FEATURE_DU_DEFAULT_BLOCKSIZE_1K
  29 //config:       bool "Use a default blocksize of 1024 bytes (1K)"
  30 //config:       default y
  31 //config:       depends on DU
  32 //config:       help
  33 //config:       Use a blocksize of (1K) instead of the default 512b.
  34
  35 //applet:IF_DU(APPLET(du, BB_DIR_USR_BIN, BB_SUID_DROP))
  36
  37 //kbuild:lib-$(CONFIG_DU) += du.o
  38
  39 /* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
  40 /* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
  41
  42 //usage:#define du_trivial_usage
  43 //usage:       "[-aHLdclsx" IF_FEATURE_HUMAN_READABLE("hm") "k] [FILE]..."
  44 //usage:#define du_full_usage "\n\n"
  45 //usage:       "Summarize disk space used for each FILE and/or directory\n"
  46 //usage:     "\n        -a      Show file sizes too"
  47 //usage:     "\n        -L      Follow all symlinks"
  48 //usage:     "\n        -H      Follow symlinks on command line"
  49 //usage:     "\n        -d N    Limit output to directories (and files with -a) of depth < N"
  50 //usage:     "\n        -c      Show grand total"
  51 //usage:     "\n        -l      Count sizes many times if hard linked"
  52 //usage:     "\n        -s      Display only a total for each argument"
  53 //usage:     "\n        -x      Skip directories on different filesystems"
  54 //usage:        IF_FEATURE_HUMAN_READABLE(
  55 //usage:     "\n        -h      Sizes in human readable format (e.g., 1K 243M 2G)"
  56 //usage:     "\n        -m      Sizes in megabytes"
  57 //usage:        )
  58 //usage:     "\n        -k      Sizes in kilobytes" IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(" (default)")
  59 //usage:        IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(
  60 //usage:     "\n                Default unit is 512 bytes"
  61 //usage:        )
  62 //usage:
  63 //usage:#define du_example_usage
  64 //usage:       "$ du\n"
  65 //usage:       "16      ./CVS\n"
  66 //usage:       "12      ./kernel-patches/CVS\n"
  67 //usage:       "80      ./kernel-patches\n"
  68 //usage:       "12      ./tests/CVS\n"
  69 //usage:       "36      ./tests\n"
  70 //usage:       "12      ./scripts/CVS\n"
  71 //usage:       "16      ./scripts\n"
  72 //usage:       "12      ./docs/CVS\n"
  73 //usage:       "104     ./docs\n"
  74 //usage:       "2417    .\n"
  75
  76 #include "libbb.h"
  77 #include "common_bufsiz.h"
  78
  79 enum {
  80         OPT_a_files_too    = (1 << 0),
  81         OPT_H_follow_links = (1 << 1),
  82         OPT_k_kbytes       = (1 << 2),
  83         OPT_L_follow_links = (1 << 3),
  84         OPT_s_total_norecurse = (1 << 4),
  85         OPT_x_one_FS       = (1 << 5),
  86         OPT_d_maxdepth     = (1 << 6),
  87         OPT_l_hardlinks    = (1 << 7),
  88         OPT_c_total        = (1 << 8),
  89         OPT_h_for_humans   = (1 << 9),
  90         OPT_m_mbytes       = (1 << 10),
  91 };
  92
  93 struct globals {
  94 #if ENABLE_FEATURE_HUMAN_READABLE
  95         unsigned long disp_unit;
  96 #else
  97         unsigned disp_k;
  98 #endif
  99         int max_print_depth;
 100         bool status;
 101         int slink_depth;
 102         int du_depth;
 103         dev_t dir_dev;
 104 } FIX_ALIASING;
 105 #define G (*(struct globals*)bb_common_bufsiz1)
 106 #define INIT_G() do { setup_common_bufsiz(); } while (0)
 107
 108
 109 static void print(unsigned long long size, const char *filename)
 110 {
 111         /* TODO - May not want to defer error checking here. */
 112 #if ENABLE_FEATURE_HUMAN_READABLE
 113 # if ENABLE_DESKTOP
 114         /* ~30 bytes of code for extra comtat:
 115          * coreutils' du rounds sizes up:
 116          * for example,  1025k file is shown as "2" by du -m.
 117          * We round to nearest if human-readable [too hard to fix],
 118          * else (fixed scale such as -m), we round up. To that end,
 119          * add yet another half of the unit before displaying:
 120          */
 121         if (G.disp_unit)
 122                 size += (G.disp_unit-1) / (unsigned)(512 * 2);
 123 # endif
 124         printf("%s\t%s\n",
 125                         /* size x 512 / G.disp_unit.
 126                          * If G.disp_unit == 0, show one fractional
 127                          * and use suffixes
 128                          */
 129                         make_human_readable_str(size, 512, G.disp_unit),
 130                         filename);
 131 #else
 132         if (G.disp_k) {
 133                 size++;
 134                 size >>= 1;
 135         }
 136         printf("%llu\t%s\n", size, filename);
 137 #endif
 138 }
 139
 140 /* tiny recursive du */
 141 static unsigned long long du(const char *filename)
 142 {
 143         struct stat statbuf;
 144         unsigned long long sum;
 145
 146         if (lstat(filename, &statbuf) != 0) {
 147                 bb_simple_perror_msg(filename);
 148                 G.status = EXIT_FAILURE;
 149                 return 0;
 150         }
 151
 152         if (option_mask32 & OPT_x_one_FS) {
 153                 if (G.du_depth == 0) {
 154                         G.dir_dev = statbuf.st_dev;
 155                 } else if (G.dir_dev != statbuf.st_dev) {
 156                         return 0;
 157                 }
 158         }
 159
 160         sum = statbuf.st_blocks;
 161
 162         if (S_ISLNK(statbuf.st_mode)) {
 163                 if (G.slink_depth > G.du_depth) { /* -H or -L */
 164                         if (stat(filename, &statbuf) != 0) {
 165                                 bb_simple_perror_msg(filename);
 166                                 G.status = EXIT_FAILURE;
 167                                 return 0;
 168                         }
 169                         sum = statbuf.st_blocks;
 170                         if (G.slink_depth == 1) {
 171                                 /* Convert -H to -L */
 172                                 G.slink_depth = INT_MAX;
 173                         }
 174                 }
 175         }
 176
 177         if (!(option_mask32 & OPT_l_hardlinks)
 178          && statbuf.st_nlink > 1
 179         ) {
 180                 /* Add files/directories with links only once */
 181                 if (is_in_ino_dev_hashtable(&statbuf)) {
 182                         return 0;
 183                 }
 184                 add_to_ino_dev_hashtable(&statbuf, NULL);
 185         }
 186
 187         if (S_ISDIR(statbuf.st_mode)) {
 188                 DIR *dir;
 189                 struct dirent *entry;
 190                 char *newfile;
 191
 192                 dir = warn_opendir(filename);
 193                 if (!dir) {
 194                         G.status = EXIT_FAILURE;
 195                         return sum;
 196                 }
 197
 198                 while ((entry = readdir(dir))) {
 199                         newfile = concat_subpath_file(filename, entry->d_name);
 200                         if (newfile == NULL)
 201                                 continue;
 202                         ++G.du_depth;
 203                         sum += du(newfile);
 204                         --G.du_depth;
 205                         free(newfile);
 206                 }
 207                 closedir(dir);
 208         } else {
 209                 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
 210                         return sum;
 211         }
 212         if (G.du_depth <= G.max_print_depth) {
 213                 print(sum, filename);
 214         }
 215         return sum;
 216 }
 217
 218 int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 219 int du_main(int argc UNUSED_PARAM, char **argv)
 220 {
 221         unsigned long long total;
 222         int slink_depth_save;
 223         unsigned opt;
 224
 225         INIT_G();
 226
 227 #if ENABLE_FEATURE_HUMAN_READABLE
 228         IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 1024;)
 229         IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_unit = 512;)
 230         if (getenv("POSIXLY_CORRECT"))  /* TODO - a new libbb function? */
 231                 G.disp_unit = 512;
 232 #else
 233         IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
 234         /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
 235 #endif
 236         G.max_print_depth = INT_MAX;
 237
 238         /* Note: SUSv3 specifies that -a and -s options cannot be used together
 239          * in strictly conforming applications.  However, it also says that some
 240          * du implementations may produce output when -a and -s are used together.
 241          * gnu du exits with an error code in this case.  We choose to simply
 242          * ignore -a.  This is consistent with -s being equivalent to -d 0.
 243          */
 244 #if ENABLE_FEATURE_HUMAN_READABLE
 245         opt = getopt32(argv, "^"
 246                         "aHkLsxd:+lchm"
 247                         "\0" "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s",
 248                         &G.max_print_depth
 249         );
 250         argv += optind;
 251         if (opt & OPT_h_for_humans) {
 252                 G.disp_unit = 0;
 253         }
 254         if (opt & OPT_m_mbytes) {
 255                 G.disp_unit = 1024*1024;
 256         }
 257         if (opt & OPT_k_kbytes) {
 258                 G.disp_unit = 1024;
 259         }
 260 #else
 261         opt = getopt32(argv, "^"
 262                         "aHkLsxd:+lc"
 263                         "\0" "H-L:L-H:s-d:d-s",
 264                         &G.max_print_depth
 265         );
 266         argv += optind;
 267 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
 268         if (opt & OPT_k_kbytes) {
 269                 G.disp_k = 1;
 270         }
 271 #endif
 272 #endif
 273         if (opt & OPT_H_follow_links) {
 274                 G.slink_depth = 1;
 275         }
 276         if (opt & OPT_L_follow_links) {
 277                 G.slink_depth = INT_MAX;
 278         }
 279         if (opt & OPT_s_total_norecurse) {
 280                 G.max_print_depth = 0;
 281         }
 282
 283         /* go through remaining args (if any) */
 284         if (!*argv) {
 285                 *--argv = (char*)".";
 286                 if (G.slink_depth == 1) {
 287                         G.slink_depth = 0;
 288                 }
 289         }
 290
 291         slink_depth_save = G.slink_depth;
 292         total = 0;
 293         do {
 294                 total += du(*argv);
 295                 /* otherwise du /dir /dir won't show /dir twice: */
 296                 reset_ino_dev_hashtable();
 297                 G.slink_depth = slink_depth_save;
 298         } while (*++argv);
 299
 300         if (opt & OPT_c_total)
 301                 print(total, "total");
 302
 303         fflush_stdout_and_exit(G.status);
 304 }