1 /* df.c - report free disk space.
2 *
3 * Copyright 2006 Rob Landley <rob@landley.net>
4 *
5 * See http://opengroup.org/onlinepubs/9699919799/utilities/df.html
6
7 USE_DF(NEWTOY(df, "HPkht*a[-HPkh]", TOYFLAG_SBIN))
8
9 config DF
10 bool "df"
11 default y
12 help
13 usage: df [-HPkh] [-t type] [FILESYSTEM ...]
14
15 The "disk free" command shows total/used/available disk space for
16 each filesystem listed on the command line, or all currently mounted
17 filesystems.
18
19 -P The SUSv3 "Pedantic" option
20 -k Sets units back to 1024 bytes (the default without -P)
21 -h Human readable output (K=1024)
22 -H Human readable output (k=1000)
23 -t type Display only filesystems of this type.
24
25 Pedantic provides a slightly less useful output format dictated by Posix,
26 and sets the units to 512 bytes instead of the default 1024 bytes.
27 */
28
29 #define FOR_df
30 #include "toys.h"
31
GLOBALS(struct arg_list * fstype;long units;int column_widths[5];int header_shown;)32 GLOBALS(
33 struct arg_list *fstype;
34
35 long units;
36 int column_widths[5];
37 int header_shown;
38 )
39
40 static void measure_column(int col, const char *s)
41 {
42 size_t len = strlen(s);
43
44 if (TT.column_widths[col] < len) TT.column_widths[col] = len;
45 }
46
measure_numeric_column(int col,long long n)47 static void measure_numeric_column(int col, long long n)
48 {
49 snprintf(toybuf, sizeof(toybuf), "%lld", n);
50 return measure_column(col, toybuf);
51 }
52
show_header()53 static void show_header()
54 {
55 TT.header_shown = 1;
56
57 // The filesystem column is always at least this wide.
58 if (TT.column_widths[0] < 14) TT.column_widths[0] = 14;
59
60 if (toys.optflags & (FLAG_H|FLAG_h)) {
61 xprintf("%-*s Size Used Avail Use%% Mounted on\n",
62 TT.column_widths[0], "Filesystem");
63 } else {
64 const char *blocks_label = TT.units == 512 ? "512-blocks" : "1K-blocks";
65 const char *use_label = toys.optflags & FLAG_P ? "Capacity" : "Use%";
66
67 measure_column(1, blocks_label);
68 measure_column(2, "Used");
69 measure_column(3, "Available");
70 measure_column(4, use_label);
71 xprintf("%-*s %*s %*s %*s %*s Mounted on\n",
72 TT.column_widths[0], "Filesystem",
73 TT.column_widths[1], blocks_label,
74 TT.column_widths[2], "Used",
75 TT.column_widths[3], "Available",
76 TT.column_widths[4], use_label);
77
78 // For the "Use%" column, the trailing % should be inside the column.
79 TT.column_widths[4]--;
80 }
81 }
82
show_mt(struct mtab_list * mt,int measuring)83 static void show_mt(struct mtab_list *mt, int measuring)
84 {
85 long long size, used, avail, percent, block;
86 char *device;
87
88 // Return if it wasn't found (should never happen, but with /etc/mtab...)
89 if (!mt) return;
90
91 // If we have -t, skip other filesystem types
92 if (TT.fstype) {
93 struct arg_list *al;
94
95 for (al = TT.fstype; al; al = al->next)
96 if (!strcmp(mt->type, al->arg)) break;
97
98 if (!al) return;
99 }
100
101 // If we don't have -a, skip synthetic filesystems
102 if (!(toys.optflags & FLAG_a) && !mt->statvfs.f_blocks) return;
103
104 // Figure out how much total/used/free space this filesystem has,
105 // forcing 64-bit math because filesystems are big now.
106 block = mt->statvfs.f_bsize ? mt->statvfs.f_bsize : 1;
107 size = (block * mt->statvfs.f_blocks) / TT.units;
108 used = (block * (mt->statvfs.f_blocks-mt->statvfs.f_bfree)) / TT.units;
109 avail = (block*(getuid()?mt->statvfs.f_bavail:mt->statvfs.f_bfree))/TT.units;
110 if (!(used+avail)) percent = 0;
111 else {
112 percent = (used*100)/(used+avail);
113 if (used*100 != percent*(used+avail)) percent++;
114 }
115
116 device = *mt->device == '/' ? realpath(mt->device, NULL) : NULL;
117 if (!device) device = mt->device;
118
119 if (measuring) {
120 measure_column(0, device);
121 measure_numeric_column(1, size);
122 measure_numeric_column(2, used);
123 measure_numeric_column(3, avail);
124 } else {
125 if (!TT.header_shown) show_header();
126
127 if (toys.optflags & (FLAG_H|FLAG_h)) {
128 char *size_str = toybuf, *used_str = toybuf+64, *avail_str = toybuf+128;
129 int hr_flags = (toys.optflags & FLAG_H) ? HR_1000 : 0;
130
131 human_readable(size_str, size, hr_flags);
132 human_readable(used_str, used, hr_flags);
133 human_readable(avail_str, avail, hr_flags);
134 xprintf("%-*s %4s %4s %4s % 3lld%% %s\n",
135 TT.column_widths[0], device,
136 size_str, used_str, avail_str, percent, mt->dir);
137 } else xprintf("%-*s %*lld %*lld %*lld %*lld%% %s\n",
138 TT.column_widths[0], device,
139 TT.column_widths[1], size,
140 TT.column_widths[2], used,
141 TT.column_widths[3], avail,
142 TT.column_widths[4], percent,
143 mt->dir);
144 }
145
146 if (device != mt->device) free(device);
147 }
148
df_main(void)149 void df_main(void)
150 {
151 struct mtab_list *mt, *mtstart, *mtend;
152 int measuring;
153
154 if (toys.optflags & (FLAG_H|FLAG_h)) {
155 TT.units = 1;
156 } else {
157 // Units are 512 bytes if you select "pedantic" without "kilobytes".
158 TT.units = toys.optflags & FLAG_P ? 512 : 1024;
159 }
160
161 if (!(mtstart = xgetmountlist(0))) return;
162 mtend = dlist_terminate(mtstart);
163
164 // If we have a list of filesystems on the command line, loop through them.
165 if (*toys.optargs) {
166 // Measure the names then output the table.
167 for (measuring = 1; measuring >= 0; --measuring) {
168 char **next;
169
170 for (next = toys.optargs; *next; next++) {
171 struct stat st;
172
173 // Stat it (complain if we can't).
174 if (stat(*next, &st)) {
175 perror_msg("'%s'", *next);
176 continue;
177 }
178
179 // Find and display this filesystem. Use _last_ hit in case of
180 // overmounts (which is first hit in the reversed list).
181 for (mt = mtend; mt; mt = mt->prev) {
182 if (st.st_dev == mt->stat.st_dev
183 || (st.st_rdev && (st.st_rdev == mt->stat.st_dev)))
184 {
185 show_mt(mt, measuring);
186 break;
187 }
188 }
189 }
190 }
191 } else {
192 // Loop through mount list to filter out overmounts.
193 for (mt = mtend; mt; mt = mt->prev) {
194 struct mtab_list *mt2, *mt3;
195
196 // 0:0 is LANANA null device
197 if (!mt->stat.st_dev) continue;
198
199 // Filter out overmounts.
200 mt3 = mt;
201 for (mt2 = mt->prev; mt2; mt2 = mt2->prev) {
202 if (mt->stat.st_dev == mt2->stat.st_dev) {
203 // For --bind mounts, show earliest mount
204 if (!strcmp(mt->device, mt2->device)) {
205 if (!toys.optflags & FLAG_a) mt3->stat.st_dev = 0;
206 mt3 = mt2;
207 } else mt2->stat.st_dev = 0;
208 }
209 }
210 }
211
212 // Measure the names then output the table.
213 for (measuring = 1; measuring >= 0; --measuring) {
214 // Cosmetic: show filesystems in creation order.
215 for (mt = mtstart; mt; mt = mt->next) {
216 if (mt->stat.st_dev) show_mt(mt, measuring);
217 }
218 }
219 }
220
221 if (CFG_TOYBOX_FREE) llist_traverse(mtstart, free);
222 }
223