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/* umount.c - Unmount a mount point.
*
* Copyright 2012 Rob Landley <rob@landley.net>
*
* See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/umount.html
*
* Note: -n (/etc/mtab) is obsolete, /proc/mounts replaced it. Neither chroot
* nor per-process mount namespaces can work sanely with mtab. The kernel
* tracks mount points now, a userspace application can't do so anymore.
USE_UMOUNT(NEWTOY(umount, "ndDflrat*v", TOYFLAG_BIN|TOYFLAG_STAYROOT))
config UMOUNT
bool "umount"
default y
help
usage: umount [-a [-t TYPE[,TYPE...]]] [-vrfD] [DIR...]
Unmount the listed filesystems.
-a Unmount all mounts in /proc/mounts instead of command line list
-t Restrict "all" to mounts of TYPE (or use "noTYPE" to skip)
-D Don't free loopback device(s).
-f Force unmount.
-l Lazy unmount (detach from filesystem now, close when last user does).
-r Remount read only if unmounting fails.
-v Verbose
*/
#define FOR_umount
#include "toys.h"
GLOBALS(
struct arg_list *t;
char *types;
)
// todo
// borrow df code to identify filesystem?
// umount -a from fstab
// umount when getpid() not 0, according to fstab
// lookup mount: losetup -d, bind, file, block
// TODO
// loopback delete
// fstab -o user
// Realloc *old with oldstring,newstring
void comma_collate(char **old, char *new)
{
char *temp, *atold = *old;
// Only add a comma if old string didn't end with one
if (atold && *atold) {
char *comma = ",";
if (atold[strlen(atold)-1] == ',') comma = "";
temp = xmprintf("%s%s%s", atold, comma, new);
} else temp = xstrdup(new);
free (atold);
*old = temp;
}
void arg_comma_collate(char **old, struct arg_list *arg)
{
while (arg) {
comma_collate(old, arg->arg);
arg = arg->next;
}
}
char *comma_iterate(char **list, int *len)
{
char *start = *list, *end;
if (!*list) return 0;
if (!(end = strchr(*list, ','))) {
*len = strlen(*list);
*list = 0;
} else *list += (*len = end-start)+1;
return start;
}
static void do_umount(char *dir, int flags)
{
if (!umount2(dir, flags)) {
if (toys.optflags & FLAG_v) printf("%s unmounted", dir);
return;
}
if (toys.optflags & FLAG_r) {
if (!mount("", dir, "", MS_REMOUNT|MS_RDONLY, "")) {
if (toys.optflags & FLAG_v) printf("%s remounted ro", dir);
return;
}
}
perror_msg("%s", dir);
}
void umount_main(void)
{
int flags=0;
char **optargs;
if (!toys.optc && !(toys.optflags & FLAG_a))
error_exit("Need 1 arg or -a");
if (toys.optflags & FLAG_f) flags |= MNT_FORCE;
if (toys.optflags & FLAG_l) flags |= MNT_DETACH;
for (optargs = toys.optargs; *optargs; optargs++) do_umount(*optargs, flags);
if (toys.optflags & FLAG_a) {
struct mtab_list *mlsave, *ml;
char *typestr = 0;
if (TT.t) arg_comma_collate(&typestr, TT.t);
// Loop through mounted filesystems
for (mlsave = ml = xgetmountlist(0); ml; ml = ml->next) {
if (TT.t) {
char *type, *types = typestr;
int len, skip = strncmp(types, "no", 2);
// Loop through -t filters
for (;;) {
if (!(type = comma_iterate(&types, &len))) break;
if (!skip) {
if (strncmp(type, "no", 2)) error_exit("bad -t");
if (!strncmp(type+2, ml->type, len-2)) {
skip = 1;
break;
}
} else if (!strncmp(type, ml->type, len) && !ml->type[len]) {
skip = 0;
break;
}
}
if (skip) continue;
}
do_umount(ml->dir, flags);
}
if (CFG_TOYBOX_FREE) {
free(typestr);
llist_traverse(mlsave, free);
}
return;
}
}
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