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/*-*- Mode: C; c-basic-offset: 8 -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/mount.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <libgen.h>
#include <assert.h>
#include "mount-setup.h"
#include "log.h"
enum {
MOUNT_WHAT,
MOUNT_WHERE,
MOUNT_TYPE,
MOUNT_OPTIONS,
MOUNT_SKIP
};
static const char *table[] = {
"proc", "/proc", "proc", NULL,
"sysfs", "/sys", "sysfs", NULL,
"devtmps", "/dev", "devtmpfs", "mode=755",
"tmpfs", "/dev/shm", "tmpfs", "mode=1777",
"devpts", "/dev/pts", "devpts", NULL,
"cgroup", "/cgroup/debug", "cgroup", "debug",
"debugfs", "/sys/kernel/debug", "debugfs", NULL,
NULL
};
static int is_mount_point(const char *t) {
struct stat a, b;
char *copy;
if (lstat(t, &a) < 0) {
if (errno == ENOENT)
return 0;
return -errno;
}
if (!(copy = strdup(t)))
return -ENOMEM;
if (lstat(dirname(copy), &b) < 0) {
free(copy);
return -errno;
}
free(copy);
return a.st_dev != b.st_dev;
}
static int mount_one(const char *t[]) {
int r;
assert(t);
if ((r = is_mount_point(t[MOUNT_WHERE])) < 0)
return r;
if (r > 0)
return 0;
/* The access mode here doesn't really matter too much, since
* the mounted file system will take precedence anyway. */
mkdir(t[MOUNT_WHERE], 0755);
log_debug("Mounting %s to %s of type %s with options %s.",
t[MOUNT_WHAT],
t[MOUNT_WHERE],
t[MOUNT_TYPE],
t[MOUNT_OPTIONS]);
if (mount(t[MOUNT_WHAT],
t[MOUNT_WHERE],
t[MOUNT_TYPE],
0,
t[MOUNT_OPTIONS]) < 0) {
log_error("Failed to mount %s: %s", t[MOUNT_WHERE], strerror(errno));
return -errno;
}
return 0;
}
int mount_setup(void) {
int r;
const char **t;
for (t = table; *t; t += MOUNT_SKIP)
if ((r = mount_one(t)) < 0)
return r;
return 0;
}
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