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/* df.c - report free disk space.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/df.html
USE_DF(NEWTOY(df, "Pkt*a[-Pk]", TOYFLAG_USR|TOYFLAG_SBIN))
config DF
bool "df"
default y
help
usage: df [-t type] [FILESYSTEM ...]
The "disk free" command shows total/used/available disk space for
each filesystem listed on the command line, or all currently mounted
filesystems.
-P The SUSv3 "Pedantic" option
-k Sets units back to 1024 bytes (the default without -P)
-t type Display only filesystems of this type.
Pedantic provides a slightly less useful output format dictated by Posix,
and sets the units to 512 bytes instead of the default 1024 bytes.
*/
#define FOR_df
#include "toys.h"
GLOBALS(
struct arg_list *fstype;
long units;
)
static void show_mt(struct mtab_list *mt)
{
int len;
long long size, used, avail, percent, block;
char *device;
// Return if it wasn't found (should never happen, but with /etc/mtab...)
if (!mt) return;
// If we have -t, skip other filesystem types
if (TT.fstype) {
struct arg_list *al;
for (al = TT.fstype; al; al = al->next)
if (!strcmp(mt->type, al->arg)) break;
if (!al) return;
}
// If we don't have -a, skip synthetic filesystems
if (!(toys.optflags & FLAG_a) && !mt->statvfs.f_blocks) return;
// Figure out how much total/used/free space this filesystem has,
// forcing 64-bit math because filesystems are big now.
block = mt->statvfs.f_bsize ? mt->statvfs.f_bsize : 1;
size = (block * mt->statvfs.f_blocks) / TT.units;
used = (block * (mt->statvfs.f_blocks-mt->statvfs.f_bfree)) / TT.units;
avail = (block*(getuid()?mt->statvfs.f_bavail:mt->statvfs.f_bfree))/TT.units;
if (!(used+avail)) percent = 0;
else {
percent = (used*100)/(used+avail);
if (used*100 != percent*(used+avail)) percent++;
}
device = *mt->device == '/' ? realpath(mt->device, NULL) : NULL;
if (!device) device = mt->device;
// Figure out appropriate spacing
len = 25 - strlen(device);
if (len < 1) len = 1;
xprintf("%s% *lld % 10lld % 10lld % *lld%% %s\n", device, len,
size, used, avail, (toys.optflags & FLAG_P) ? 7 : 3, percent, mt->dir);
if (device != mt->device) free(device);
}
void df_main(void)
{
struct mtab_list *mt, *mtstart, *mtend;
int p = toys.optflags & FLAG_P;
// Units are 512 bytes if you select "pedantic" without "kilobytes".
TT.units = p ? 512 : 1024;
xprintf("Filesystem%8s-blocks\tUsed Available %s Mounted on\n",
p ? "512" : "1K", p ? "Capacity" : "Use%");
if (!(mtstart = xgetmountlist(0))) return;
mtend = dlist_terminate(mtstart);
// If we have a list of filesystems on the command line, loop through them.
if (*toys.optargs) {
char **next;
for(next = toys.optargs; *next; next++) {
struct stat st;
// Stat it (complain if we can't).
if(stat(*next, &st)) {
perror_msg("'%s'", *next);
continue;
}
// Find and display this filesystem. Use _last_ hit in case of
// overmounts (which is first hit in the reversed list).
for (mt = mtend; mt; mt = mt->prev) {
if (st.st_dev == mt->stat.st_dev
|| (st.st_rdev && (st.st_rdev == mt->stat.st_dev)))
{
show_mt(mt);
break;
}
}
}
} else {
// Loop through mount list to filter out overmounts.
for (mt = mtend; mt; mt = mt->prev) {
struct mtab_list *mt2, *mt3;
// 0:0 is LANANA null device
if (!mt->stat.st_dev) continue;
// Filter out overmounts.
mt3 = mt;
for (mt2 = mt->prev; mt2; mt2 = mt2->prev) {
if (mt->stat.st_dev == mt2->stat.st_dev) {
// For --bind mounts, show earliest mount
if (!strcmp(mt->device, mt2->device)) {
if (!toys.optflags & FLAG_a) mt3->stat.st_dev = 0;
mt3 = mt2;
} else mt2->stat.st_dev = 0;
}
}
}
// Cosmetic: show filesystems in creation order
for (mt = mtstart; mt; mt = mt->next) if (mt->stat.st_dev) show_mt(mt);
}
if (CFG_TOYBOX_FREE) llist_traverse(mtstart, free);
}
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