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/* mount.c - mount filesystems
*
* Copyright 2014 Rob Landley <rob@landley.net>
*
* See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/mount.html
* Note: -hV is bad spec, haven't implemented -FsLU yet
* no mtab (/proc/mounts does it) so -n is NOP.
USE_MOUNT(NEWTOY(mount, "?>2afnrvwt:o*[-rw]", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_STAYROOT))
config MOUNT
bool "mount"
default n
help
usage: mount [-afFrsvw] [-t TYPE] [-o OPTIONS...] [[DEVICE] DIR]
Mount new filesystem(s) on directories. With no arguments, display existing
mounts.
-a mount all entries in /etc/fstab (with -t, only entries of that TYPE)
-f fake it (don't actually mount)
-r read only (same as -o ro)
-w read/write (default, same as -o rw)
-t specify filesystem type
-v verbose
OPTIONS is a comma separated list of options, which can also be supplied
as --longopts.
This mount autodetects loopback mounts (a file on a directory) and
bind mounts (file on file, directory on directory), so you don't need
to say --bind or --loop.
*/
#define FOR_mount
#include "toys.h"
GLOBALS(
struct arg_list *optlist;
char *type;
unsigned long flags;
char *opts;
)
// Strip flags out of comma separated list of options.
// Return flags,
static long parse_opts(char *new, long flags, char **more)
{
struct {
char *name;
long flags;
} opts[] = {
// NOPs (we autodetect --loop and --bind)
{"loop", 0}, {"bind", 0}, {"defaults", 0}, {"quiet", 0},
// {"noauto", 0}, {"swap", 0},
{"ro", MS_RDONLY}, {"rw", ~MS_RDONLY},
{"nosuid", MS_NOSUID}, {"suid", ~MS_NOSUID},
{"nodev", MS_NODEV}, {"dev", ~MS_NODEV},
{"noexec", MS_NOEXEC}, {"exec", ~MS_NOEXEC},
{"sync", MS_SYNCHRONOUS}, {"async", ~MS_SYNCHRONOUS},
{"noatime", MS_NOATIME}, {"atime", ~MS_NOATIME},
{"nodiratime", MS_NODIRATIME}, {"diratime", ~MS_NODIRATIME},
{"loud", ~MS_SILENT},
{"shared", MS_SHARED}, {"rshared", MS_SHARED|MS_REC},
{"slave", MS_SLAVE}, {"rslave", MS_SLAVE|MS_REC},
{"private", MS_PRIVATE}, {"rprivate", MS_SLAVE|MS_REC},
{"unbindable", MS_UNBINDABLE}, {"runbindable", MS_UNBINDABLE|MS_REC},
{"remount", MS_REMOUNT}, {"move", MS_MOVE},
// mand dirsync rec iversion strictatime
};
for (;;) {
char *comma = strchr(new, ',');
int i;
if (comma) *comma = 0;
// If we recognize an option, apply flags
for (i = 0; i < ARRAY_LEN(opts); i++) if (!strcasecmp(opts[i].name, new)) {
long ll = opts[i].flags;
if (ll < 0) flags &= ll;
else flags |= ll;
break;
}
// If we didn't recognize it, keep string version
if (more && i == ARRAY_LEN(opts)) {
i = *more ? strlen(*more) : 0;
*more = xrealloc(*more, i + strlen(new) + 2);
if (i) (*more)[i++] = ',';
strcpy(i+*more, new);
}
if (!comma) break;
*comma = ',';
new = comma + 1;
}
return flags;
}
static void mount_filesystem(char *dev, char *dir, char *type,
unsigned long flags, char *opts)
{
FILE *fp = 0;
int rc = EINVAL;
if (toys.optflags & FLAG_f) return;
// Autodetect bind mount or filesystem type
if (!type) {
struct stat stdev, stdir;
if (!stat(dev, &stdev) && !stat(dir, &stdir)
&& ((S_ISREG(stdev.st_mode) && S_ISREG(stdir.st_mode))
|| (S_ISDIR(stdev.st_mode) && S_ISDIR(stdir.st_mode))))
{
flags |= MS_BIND;
} else fp = xfopen("/proc/filesystems", "r");
}
for (;;) {
char *buf = 0;
// If type wasn't specified, try all of them in order.
if (fp) {
size_t i;
if (getline(&buf, &i, fp)<0) break;
type = buf;
// skip nodev devices
if (!isspace(*type)) {
free(buf);
continue;
}
// trim whitespace
while (isspace(*type)) type++;
i = strlen(type);
if (i) type[i-1] = 0;
}
if (toys.optflags & FLAG_v)
printf("try '%s' type '%s' on '%s'\n", dev, type, dir);
rc = mount(dev, dir, type, flags, opts);
// Looking for bind mounts in autodetect above isn't good enough because
// "mount -t ext2 fs.img dir" is valid, but if you _do_ accept bind mounts
// with -t how do you tell "-t cifs" isn't looking for a block device if
// it's not in /proc/filesystems yet because the module that won't be
// loaded until you try the mount, and if you can't then DEVICE
// existing as a file would cause a false positive loopback mount.
//
// Solution: try mount, let the kernel tell us it wanted a block device,
// do the loopback setup and retry the mount.
if (rc && errno == ENOTBLK) {
char *losetup[] = {"losetup", "-fs", dev, 0};
int pipes[2], len;
pid_t pid;
if (flags & MS_RDONLY) losetup[1] = "-fsr";
pid = xpopen(losetup, pipes);
len = readall(pipes[1], toybuf, sizeof(toybuf)-1);
if (!xpclose(pid, pipes) && len > 1) {
if (toybuf[len-1] == '\n') --len;
toybuf[len] = 0;
dev = toybuf;
continue;
} else error_msg("losetup failed %d", len);
}
if (!fp || (rc && errno != EINVAL)) break;
free(buf);
}
if (fp) fclose(fp);
if (rc) perror_msg("'%s' on '%s'", dev, dir);
}
void mount_main(void)
{
long flags = MS_SILENT;
struct arg_list *o;
char *opts = 0;
if (toys.optflags & FLAG_a) {
fprintf(stderr, "not yet\n");
return;
}
if (toys.optflags & FLAG_r) flags |= MS_RDONLY;
if (toys.optflags & FLAG_w) flags &= ~MS_RDONLY;
for (o = TT.optlist; o; o = o->next)
flags = parse_opts(o->arg, flags, &opts);
// show mounts
if (!toys.optc) {
struct mtab_list *mtl = xgetmountlist(0), *m;
for (mtl = xgetmountlist(0); mtl && (m = dlist_pop(&mtl)); free(m)) {
char *s = 0;
if (TT.type && strcmp(TT.type, m->type)) continue;
if (*m->device == '/') s = xabspath(m->device, 0);
xprintf("%s on %s type %s (%s)\n",
s ? s : m->device, m->dir, m->type, m->opts);
free(s);
}
// one argument: from fstab, remount, subtree
} else if (toys.optc == 1) {
fprintf(stderr, "not yet\n");
return;
// two arguments
} else mount_filesystem(toys.optargs[0], toys.optargs[1], TT.type,
flags, opts ? opts : "");
}
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