blob: 1c7d6cb38eb1736aa702c201f9557c886fc0062d [file] [log] [blame]
Erik Andersene49d5ec2000-02-08 19:58:47 +00001/* vi: set sw=4 ts=4: */
Eric Andersenc4996011999-10-20 22:08:37 +00002/*
3 * Mini df implementation for busybox
4 *
Eric Andersenc7bda1c2004-03-15 08:29:22 +00005 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
Eric Andersenc4996011999-10-20 22:08:37 +00006 * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
7 *
Bernhard Reutner-Fischerb1629b12006-05-19 19:29:19 +00008 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
Eric Andersenc4996011999-10-20 22:08:37 +00009 */
10
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000011/* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
Manuel Novoa III cad53642003-03-19 09:13:01 +000012/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
13
14/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
15 *
16 * Size reduction. Removed floating point dependency. Added error checking
Eric Andersenaff114c2004-04-14 17:51:38 +000017 * on output. Output stats on 0-sized filesystems if specifically listed on
Manuel Novoa III cad53642003-03-19 09:13:01 +000018 * the command line. Properly round *-blocks, Used, and Available quantities.
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000019 *
20 * Aug 28, 2008 Bernhard Reutner-Fischer
21 *
22 * Implement -P and -B; better coreutils compat; cleanup
Manuel Novoa III cad53642003-03-19 09:13:01 +000023 */
24
Eric Andersencc8ed391999-10-05 16:24:54 +000025#include <mntent.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000026#include <sys/vfs.h>
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000027#include "libbb.h"
Eric Andersencc8ed391999-10-05 16:24:54 +000028
Denis Vlasenkoe3241842007-08-13 10:36:25 +000029#if !ENABLE_FEATURE_HUMAN_READABLE
Denis Vlasenko08294db2007-08-13 12:27:49 +000030static unsigned long kscale(unsigned long b, unsigned long bs)
Eric Andersencc8ed391999-10-05 16:24:54 +000031{
Denis Vlasenko08294db2007-08-13 12:27:49 +000032 return (b * (unsigned long long) bs + 1024/2) / 1024;
Eric Andersencc8ed391999-10-05 16:24:54 +000033}
Manuel Novoa III cad53642003-03-19 09:13:01 +000034#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000035
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000036int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Rob Landleydfba7412006-03-06 20:47:33 +000037int df_main(int argc, char **argv)
Eric Andersenc4996011999-10-20 22:08:37 +000038{
Denis Vlasenko08294db2007-08-13 12:27:49 +000039 unsigned long blocks_used;
40 unsigned blocks_percent_used;
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000041 unsigned long df_disp_hr = 1024;
Matt Kraai92ed8a32000-12-06 15:55:23 +000042 int status = EXIT_SUCCESS;
Denis Vlasenko67b23e62006-10-03 21:00:06 +000043 unsigned opt;
Manuel Novoa III cad53642003-03-19 09:13:01 +000044 FILE *mount_table;
45 struct mntent *mount_entry;
46 struct statfs s;
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000047 static const char ignored_mounts[] ALIGN1 =
48 "rootfs\0";
Richard June6d0921c2001-01-22 22:35:38 +000049
Denis Vlasenkof430cdb2007-11-15 07:02:55 +000050 enum {
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000051 OPT_KILO = (1 << 0),
52 OPT_POSIX = (1 << 1),
53 OPT_ALL = (1 << 2) * ENABLE_FEATURE_DF_FANCY,
54 OPT_INODE = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
55 OPT_BSIZE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
56 OPT_HUMAN = (1 << 5) * ENABLE_FEATURE_HUMAN_READABLE,
57 OPT_MEGA = (1 << 6) * ENABLE_FEATURE_HUMAN_READABLE,
Denis Vlasenkof430cdb2007-11-15 07:02:55 +000058 };
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000059 const char *disp_units_hdr = NULL;
60 char *chp;
Denis Vlasenkof430cdb2007-11-15 07:02:55 +000061
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000062#if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
63 opt_complementary = "k-mB:m-Bk:B-km";
64#elif ENABLE_FEATURE_HUMAN_READABLE
65 opt_complementary = "k-m:m-k";
66#endif
67 opt = getopt32(argv, "kP"
68 USE_FEATURE_DF_FANCY("aiB:")
69 USE_FEATURE_HUMAN_READABLE("hm")
70 USE_FEATURE_DF_FANCY(, &chp));
71 if (opt & OPT_MEGA)
72 df_disp_hr = 1024*1024;
73
74 if (opt & OPT_BSIZE)
75 df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
76
77 /* From the manpage of df from coreutils-6.10:
78 Disk space is shown in 1K blocks by default, unless the environment
79 variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
80 */
81 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
82 df_disp_hr = 512;
83
84 if (opt & OPT_HUMAN) {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +000085 df_disp_hr = 0;
86 disp_units_hdr = " Size";
Eric Andersen8876fb22003-06-20 09:01:58 +000087 }
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000088 if (opt & OPT_INODE)
Denis Vlasenkof430cdb2007-11-15 07:02:55 +000089 disp_units_hdr = " Inodes";
Matt Kraai92ed8a32000-12-06 15:55:23 +000090
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000091 if (disp_units_hdr == NULL) {
92#if ENABLE_FEATURE_HUMAN_READABLE
93 disp_units_hdr = xasprintf("%s-blocks",
94 make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX)));
95#else
Denis Vlasenkoe0bcba12008-09-25 10:41:15 +000096 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000097#endif
98 }
99 printf("Filesystem %-15sUsed Available %s Mounted on\n",
100 disp_units_hdr, (opt & OPT_POSIX) ? "Capacity" : "Use%");
Eric Andersenc4996011999-10-20 22:08:37 +0000101
Manuel Novoa III cad53642003-03-19 09:13:01 +0000102 mount_table = NULL;
103 argv += optind;
104 if (optind >= argc) {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000105 mount_table = setmntent(bb_path_mtab_file, "r");
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000106 if (!mount_table)
Manuel Novoa III cad53642003-03-19 09:13:01 +0000107 bb_perror_msg_and_die(bb_path_mtab_file);
Eric Andersenc4996011999-10-20 22:08:37 +0000108 }
109
Denis Vlasenko08294db2007-08-13 12:27:49 +0000110 while (1) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000111 const char *device;
112 const char *mount_point;
113
114 if (mount_table) {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000115 mount_entry = getmntent(mount_table);
116 if (!mount_entry) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000117 endmntent(mount_table);
118 break;
119 }
120 } else {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000121 mount_point = *argv++;
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000122 if (!mount_point)
Manuel Novoa III cad53642003-03-19 09:13:01 +0000123 break;
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000124 mount_entry = find_mount_point(mount_point, bb_path_mtab_file);
125 if (!mount_entry) {
126 bb_error_msg("%s: can't find mount point", mount_point);
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000127 SET_ERROR:
Manuel Novoa III cad53642003-03-19 09:13:01 +0000128 status = EXIT_FAILURE;
129 continue;
130 }
131 }
132
133 device = mount_entry->mnt_fsname;
134 mount_point = mount_entry->mnt_dir;
135
136 if (statfs(mount_point, &s) != 0) {
Denis Vlasenko0c97c9d2007-10-01 11:58:38 +0000137 bb_simple_perror_msg(mount_point);
Manuel Novoa III cad53642003-03-19 09:13:01 +0000138 goto SET_ERROR;
139 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000140
Denis Vlasenko6d38dc32007-11-15 09:02:12 +0000141 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000142 if (opt & OPT_INODE) {
143 s.f_blocks = s.f_files;
144 s.f_bavail = s.f_bfree = s.f_ffree;
145 s.f_bsize = 1;
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000146
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000147 if (df_disp_hr)
148 df_disp_hr = 1;
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000149 }
Manuel Novoa III cad53642003-03-19 09:13:01 +0000150 blocks_used = s.f_blocks - s.f_bfree;
151 blocks_percent_used = 0;
152 if (blocks_used + s.f_bavail) {
Denis Vlasenko08294db2007-08-13 12:27:49 +0000153 blocks_percent_used = (blocks_used * 100ULL
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000154 + (blocks_used + s.f_bavail)/2
155 ) / (blocks_used + s.f_bavail);
Manuel Novoa III cad53642003-03-19 09:13:01 +0000156 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000157
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000158 /* GNU coreutils 6.10 skip certain mounts, try to be compatible. */
159 if (index_in_strings(device, ignored_mounts) != -1)
Eric Andersen9d7f0f02003-06-20 09:36:49 +0000160 continue;
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000161
Denis Vlasenko6d38dc32007-11-15 09:02:12 +0000162#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
163/* ... and also this is the only user of find_block_device */
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000164 if (strcmp(device, "/dev/root") == 0) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000165 /* Adjusts device to be the real root device,
166 * or leaves device alone if it can't find it */
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000167 device = find_block_device("/");
168 if (!device) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000169 goto SET_ERROR;
170 }
171 }
Denis Vlasenko6d38dc32007-11-15 09:02:12 +0000172#endif
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000173
Denis Vlasenko08294db2007-08-13 12:27:49 +0000174 if (printf("\n%-20s" + 1, device) > 20)
175 printf("\n%-20s", "");
Denis Vlasenkoe3241842007-08-13 10:36:25 +0000176#if ENABLE_FEATURE_HUMAN_READABLE
Denis Vlasenko08294db2007-08-13 12:27:49 +0000177 printf(" %9s ",
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000178 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000179
Denis Vlasenko08294db2007-08-13 12:27:49 +0000180 printf(" %9s " + 1,
181 make_human_readable_str((s.f_blocks - s.f_bfree),
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000182 s.f_bsize, df_disp_hr));
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000183
Denis Vlasenko08294db2007-08-13 12:27:49 +0000184 printf("%9s %3u%% %s\n",
185 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
186 blocks_percent_used, mount_point);
Manuel Novoa III cad53642003-03-19 09:13:01 +0000187#else
Denis Vlasenko08294db2007-08-13 12:27:49 +0000188 printf(" %9lu %9lu %9lu %3u%% %s\n",
189 kscale(s.f_blocks, s.f_bsize),
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000190 kscale(s.f_blocks - s.f_bfree, s.f_bsize),
Denis Vlasenko08294db2007-08-13 12:27:49 +0000191 kscale(s.f_bavail, s.f_bsize),
192 blocks_percent_used, mount_point);
Manuel Novoa III cad53642003-03-19 09:13:01 +0000193#endif
194 }
Denis Vlasenko08294db2007-08-13 12:27:49 +0000195 }
Manuel Novoa III cad53642003-03-19 09:13:01 +0000196
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000197 return status;
Eric Andersenc6cb79d1999-10-13 18:01:10 +0000198}