busybox/util-linux/mount.c

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/*
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* Mini mount implementation for busybox
*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
* searches through fstab when -a is passed
* will try mounting stuff with all fses when passed -t auto
*
* 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
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*
* 1999-10-07 Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
* Rewrote of a lot of code. Removed mtab usage (I plan on
* putting it back as a compile-time option some time),
* major adjustments to option parsing, and some serious
* dieting all around.
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*/
#include "internal.h"
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <mntent.h>
#include <sys/mount.h>
#include <ctype.h>
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#include <fstab.h>
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extern const char mtab_file[]; /* Defined in utility.c */
static const char mount_usage[] = "Usage:\tmount [flags]\n"
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"\tmount [flags] device directory [-o options,more-options]\n"
"\n"
"Flags:\n"
"\t-a:\tMount all file systems in fstab.\n"
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#ifdef BB_MTAB
"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
"\t-n:\tDon't write a mount table entry.\n"
#endif
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"\t-o option:\tOne of many filesystem options, listed below.\n"
"\t-r:\tMount the filesystem read-only.\n"
"\t-t filesystem-type:\tSpecify the filesystem type.\n"
"\t-w:\tMount for reading and writing (default).\n"
"\n"
"Options for use with the \"-o\" flag:\n"
"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
"\texec / noexec:\tAllow use of executable files / disallow them.\n"
"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
"\tro / rw: Mount for read-only / read-write.\n"
"\t"
"There are EVEN MORE flags that are specific to each filesystem.\n"
"You'll have to see the written documentation for those.\n";
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struct mount_options {
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const char *name;
unsigned long and;
unsigned long or;
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};
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static const struct mount_options mount_options[] = {
{"async", ~MS_SYNCHRONOUS, 0},
{"defaults", ~0, 0},
{"dev", ~MS_NODEV, 0},
{"exec", ~MS_NOEXEC, 0},
{"nodev", ~0, MS_NODEV},
{"noexec", ~0, MS_NOEXEC},
{"nosuid", ~0, MS_NOSUID},
{"remount", ~0, MS_REMOUNT},
{"ro", ~0, MS_RDONLY},
{"rw", ~MS_RDONLY, 0},
{"suid", ~MS_NOSUID, 0},
{"sync", ~0, MS_SYNCHRONOUS},
{0, 0, 0}
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};
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#if ! defined BB_MTAB
#define do_mount(specialfile, dir, filesystemtype, flags, string_flags, useMtab, fakeIt) \
mount(specialfile, dir, filesystemtype, flags, string_flags)
#else
static int
do_mount(char* specialfile, char* dir, char* filesystemtype,
long flags, void* string_flags, int useMtab, int fakeIt)
{
int status=0;
if (fakeIt==FALSE)
status=mount(specialfile, dir, filesystemtype, flags, string_flags);
if ( status == 0 ) {
if ( useMtab==TRUE )
write_mtab(specialfile, dir, filesystemtype, flags, string_flags);
return 0;
}
else
return( status);
}
#endif
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/* Seperate standard mount options from the nonstandard string options */
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static void
parse_mount_options ( char *options, unsigned long *flags, char *strflags)
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{
while (options) {
int gotone=FALSE;
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char *comma = strchr (options, ',');
const struct mount_options* f = mount_options;
if (comma)
*comma = '\0';
while (f->name != 0) {
if (strcasecmp (f->name, options) == 0) {
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*flags &= f->and;
*flags |= f->or;
gotone=TRUE;
break;
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}
f++;
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}
if (*strflags && strflags!= '\0' && gotone==FALSE) {
char *temp=strflags;
temp += strlen (strflags);
*temp++ = ',';
*temp++ = '\0';
}
if (gotone==FALSE) {
strcat (strflags, options);
gotone=FALSE;
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}
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if (comma) {
*comma = ',';
options = ++comma;
} else {
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break;
}
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}
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}
int
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mount_one(char *blockDevice, char *directory, char *filesystemType,
unsigned long flags, char *string_flags, int useMtab, int fakeIt)
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{
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int status = 0;
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char buf[255];
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if (strcmp(filesystemType, "auto") == 0) {
FILE *f = fopen ("/proc/filesystems", "r");
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if (f == NULL)
return( FALSE);
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while (fgets (buf, sizeof (buf), f) != NULL) {
filesystemType = buf;
if (*filesystemType == '\t') { // Not a nodev filesystem
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// Add NULL termination to each line
while (*filesystemType && *filesystemType != '\n')
filesystemType++;
*filesystemType = '\0';
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filesystemType = buf;
filesystemType++; // hop past tab
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status = do_mount (blockDevice, directory, filesystemType,
flags | MS_MGC_VAL, string_flags, useMtab, fakeIt);
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if (status == 0)
break;
}
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}
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fclose (f);
} else {
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status = do_mount (blockDevice, directory, filesystemType,
flags | MS_MGC_VAL, string_flags, useMtab, fakeIt);
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}
if (status) {
fprintf (stderr, "Mounting %s on %s failed: %s\n",
blockDevice, directory, strerror(errno));
return (FALSE);
}
return (TRUE);
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}
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extern int mount_main (int argc, char **argv)
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{
char string_flags[1024]="";
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unsigned long flags = 0;
char *filesystemType = "auto";
char *device = NULL;
char *directory = NULL;
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int all = FALSE;
int fakeIt = FALSE;
int useMtab = TRUE;
int i;
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/* Only compiled in if BB_MTAB is not defined */
whine_if_fstab_is_missing();
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if (argc == 1) {
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FILE *mountTable = setmntent (mtab_file, "r");
if (mountTable) {
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struct mntent *m;
while ((m = getmntent (mountTable)) != 0) {
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struct fstab* fstabItem;
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char *blockDevice = m->mnt_fsname;
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/* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
if (strcmp (blockDevice, "/dev/root") == 0) {
fstabItem = getfsfile ("/");
if (fstabItem != NULL)
blockDevice = fstabItem->fs_spec;
}
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printf ("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
m->mnt_type, m->mnt_opts);
}
endmntent (mountTable);
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} else {
perror(mtab_file);
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}
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exit( TRUE);
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}
/* Parse options */
i = --argc;
argv++;
while (i > 0 && **argv) {
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if (**argv == '-') {
while (i>0 && *++(*argv)) switch (**argv) {
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case 'o':
if (--i == 0) {
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fprintf (stderr, "%s\n", mount_usage);
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exit( FALSE);
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}
parse_mount_options (*(++argv), &flags, string_flags);
--i;
++argv;
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break;
case 'r':
flags |= MS_RDONLY;
break;
case 't':
if (--i == 0) {
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fprintf (stderr, "%s\n", mount_usage);
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exit( FALSE);
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}
filesystemType = *(++argv);
--i;
++argv;
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break;
case 'w':
flags &= ~MS_RDONLY;
break;
case 'a':
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all = TRUE;
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break;
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#ifdef BB_MTAB
case 'f':
fakeIt = TRUE;
break;
case 'n':
useMtab = FALSE;
break;
#endif
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case 'v':
case 'h':
case '-':
fprintf (stderr, "%s\n", mount_usage);
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exit( TRUE);
break;
}
} else {
if (device == NULL)
device=*argv;
else if (directory == NULL)
directory=*argv;
else {
fprintf (stderr, "%s\n", mount_usage);
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exit( TRUE);
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}
}
i--;
argv++;
}
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if (all == TRUE) {
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struct mntent *m;
FILE *f = setmntent ("/etc/fstab", "r");
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if (f == NULL) {
perror("/etc/fstab");
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exit( FALSE);
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}
while ((m = getmntent (f)) != NULL) {
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// If the file system isn't noauto, and isn't mounted on /,
// and isn't swap or nfs, then mount it
if ((!strstr (m->mnt_opts, "noauto")) &&
(m->mnt_dir[1] != '\0') &&
(!strstr (m->mnt_type, "swap")) &&
(!strstr (m->mnt_type, "nfs")))
{
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flags = 0;
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*string_flags = '\0';
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parse_mount_options(m->mnt_opts, &flags, string_flags);
mount_one (m->mnt_fsname, m->mnt_dir, m->mnt_type,
flags, string_flags, useMtab, fakeIt);
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}
}
endmntent (f);
} else {
if (device && directory) {
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exit (mount_one (device, directory, filesystemType,
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flags, string_flags, useMtab, fakeIt));
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} else {
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fprintf (stderr, "%s\n", mount_usage);
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exit( FALSE);
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}
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}
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exit( TRUE);
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}