mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-11-29 22:50:48 +00:00
291 lines
7.4 KiB
C
291 lines
7.4 KiB
C
/*
|
|
* Mini mount implementation for busybox
|
|
*
|
|
* Copyright (C) 1999 by Erik Andersen <andersee@debian.org>
|
|
*
|
|
* 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.
|
|
* 1999-10-07 Erik Andersen. Rewrote of a lot of code. Removed mtab
|
|
* usage, major adjustments, and some serious dieting all around.
|
|
*/
|
|
|
|
#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>
|
|
#include <fstab.h>
|
|
|
|
static const char mount_usage[] = "Usage:\tmount [flags]\n"
|
|
"\tmount [flags] device directory [-o options,more-options]\n"
|
|
"\n"
|
|
"Flags:\n"
|
|
"\t-a:\tMount all file systems in fstab.\n"
|
|
"\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";
|
|
|
|
struct mount_options {
|
|
const char *name;
|
|
unsigned long and;
|
|
unsigned long or;
|
|
};
|
|
|
|
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}
|
|
};
|
|
|
|
|
|
/* Seperate standard mount options from the nonstandard string options */
|
|
static void
|
|
parse_mount_options ( char *options, unsigned long *flags, char *strflags)
|
|
{
|
|
while (options) {
|
|
int gotone=FALSE;
|
|
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) {
|
|
*flags &= f->and;
|
|
*flags |= f->or;
|
|
gotone=TRUE;
|
|
break;
|
|
}
|
|
f++;
|
|
}
|
|
if (*strflags && strflags!= '\0' && gotone==FALSE) {
|
|
char *temp=strflags;
|
|
temp += strlen (strflags);
|
|
*temp++ = ',';
|
|
*temp++ = '\0';
|
|
}
|
|
if (gotone==FALSE) {
|
|
strcat (strflags, options);
|
|
gotone=FALSE;
|
|
}
|
|
if (comma) {
|
|
*comma = ',';
|
|
options = ++comma;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
mount_one (
|
|
char *blockDevice, char *directory, char *filesystemType,
|
|
unsigned long flags, char *string_flags)
|
|
{
|
|
int status = 0;
|
|
|
|
char buf[255];
|
|
|
|
if (strcmp(filesystemType, "auto") == 0) {
|
|
FILE *f = fopen ("/proc/filesystems", "r");
|
|
|
|
if (f == NULL)
|
|
return( FALSE);
|
|
|
|
while (fgets (buf, sizeof (buf), f) != NULL) {
|
|
filesystemType = buf;
|
|
if (*filesystemType == '\t') { // Not a nodev filesystem
|
|
|
|
// Add NULL termination to each line
|
|
while (*filesystemType && *filesystemType != '\n')
|
|
filesystemType++;
|
|
*filesystemType = '\0';
|
|
|
|
filesystemType = buf;
|
|
filesystemType++; // hop past tab
|
|
|
|
status = mount (blockDevice, directory, filesystemType,
|
|
flags | MS_MGC_VAL, string_flags);
|
|
if (status == 0)
|
|
break;
|
|
}
|
|
}
|
|
fclose (f);
|
|
} else {
|
|
status = mount (blockDevice, directory, filesystemType,
|
|
flags | MS_MGC_VAL, string_flags);
|
|
}
|
|
|
|
if (status) {
|
|
fprintf (stderr, "Mounting %s on %s failed: %s\n",
|
|
blockDevice, directory, strerror(errno));
|
|
return (FALSE);
|
|
}
|
|
return (TRUE);
|
|
}
|
|
|
|
extern int mount_main (int argc, char **argv)
|
|
{
|
|
char string_flags[1024]="";
|
|
unsigned long flags = 0;
|
|
char *filesystemType = "auto";
|
|
char *device = NULL;
|
|
char *directory = NULL;
|
|
struct stat statBuf;
|
|
int all = 0;
|
|
int i;
|
|
|
|
if (stat("/etc/fstab", &statBuf) < 0)
|
|
fprintf(stderr, "/etc/fstab file missing -- Please install one.\n\n");
|
|
|
|
if (argc == 1) {
|
|
FILE *mountTable;
|
|
if ((mountTable = setmntent ("/proc/mounts", "r"))) {
|
|
struct mntent *m;
|
|
while ((m = getmntent (mountTable)) != 0) {
|
|
struct fstab* fstabItem;
|
|
char *blockDevice = m->mnt_fsname;
|
|
/* 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;
|
|
}
|
|
printf ("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
|
|
m->mnt_type, m->mnt_opts);
|
|
}
|
|
endmntent (mountTable);
|
|
}
|
|
exit( TRUE);
|
|
}
|
|
|
|
|
|
/* Parse options */
|
|
i = --argc;
|
|
argv++;
|
|
while (i > 0 && **argv) {
|
|
if (**argv == '-') {
|
|
while (i>0 && *++(*argv)) switch (**argv) {
|
|
case 'o':
|
|
if (--i == 0) {
|
|
fprintf (stderr, "%s\n", mount_usage);
|
|
exit( FALSE);
|
|
}
|
|
parse_mount_options (*(++argv), &flags, string_flags);
|
|
--i;
|
|
++argv;
|
|
break;
|
|
case 'r':
|
|
flags |= MS_RDONLY;
|
|
break;
|
|
case 't':
|
|
if (--i == 0) {
|
|
fprintf (stderr, "%s\n", mount_usage);
|
|
exit( FALSE);
|
|
}
|
|
filesystemType = *(++argv);
|
|
--i;
|
|
++argv;
|
|
break;
|
|
case 'w':
|
|
flags &= ~MS_RDONLY;
|
|
break;
|
|
case 'a':
|
|
all = 1;
|
|
break;
|
|
case 'v':
|
|
case 'h':
|
|
case '-':
|
|
fprintf (stderr, "%s\n", mount_usage);
|
|
exit( TRUE);
|
|
break;
|
|
}
|
|
} else {
|
|
if (device == NULL)
|
|
device=*argv;
|
|
else if (directory == NULL)
|
|
directory=*argv;
|
|
else {
|
|
fprintf (stderr, "%s\n", mount_usage);
|
|
exit( TRUE);
|
|
}
|
|
}
|
|
i--;
|
|
argv++;
|
|
}
|
|
|
|
if (all == 1) {
|
|
struct mntent *m;
|
|
FILE *f = setmntent ("/etc/fstab", "r");
|
|
|
|
if (f == NULL) {
|
|
perror("/etc/fstab");
|
|
exit( FALSE);
|
|
}
|
|
while ((m = getmntent (f)) != NULL) {
|
|
// If the file system isn't noauto, and isn't mounted on /, mount
|
|
// it
|
|
if ((!strstr (m->mnt_opts, "noauto"))
|
|
&& (m->mnt_dir[1] != '\0') && !((m->mnt_type[0] == 's')
|
|
&& (m->mnt_type[1] == 'w'))
|
|
&& !((m->mnt_type[0] == 'n') && (m->mnt_type[1] == 'f'))) {
|
|
mount_one (m->mnt_fsname, m->mnt_dir, m->mnt_type, flags,
|
|
m->mnt_opts);
|
|
}
|
|
}
|
|
endmntent (f);
|
|
} else {
|
|
if (device && directory) {
|
|
exit (mount_one (device, directory, filesystemType,
|
|
flags, string_flags));
|
|
} else {
|
|
fprintf (stderr, "%s\n", mount_usage);
|
|
exit( FALSE);
|
|
}
|
|
}
|
|
exit( TRUE);
|
|
}
|