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123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/mount.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libgen.h>
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#include <assert.h>
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#include "mount-setup.h"
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#include "log.h"
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#include "macro.h"
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#include "util.h"
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enum {
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MOUNT_WHAT,
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MOUNT_WHERE,
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MOUNT_TYPE,
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MOUNT_OPTIONS,
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MOUNT_SKIP
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};
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static const char *table[] = {
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"proc", "/proc", "proc", NULL,
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"sysfs", "/sys", "sysfs", NULL,
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"devtmps", "/dev", "devtmpfs", "mode=755",
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"tmpfs", "/dev/shm", "tmpfs", "mode=1777",
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"devpts", "/dev/pts", "devpts", NULL,
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"cgroup", "/cgroup/debug", "cgroup", "debug",
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"debugfs", "/sys/kernel/debug", "debugfs", NULL,
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NULL
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};
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static int is_mount_point(const char *t) {
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struct stat a, b;
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char *copy;
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if (lstat(t, &a) < 0) {
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if (errno == ENOENT)
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return 0;
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return -errno;
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}
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if (!(copy = strdup(t)))
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return -ENOMEM;
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if (lstat(dirname(copy), &b) < 0) {
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free(copy);
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return -errno;
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}
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free(copy);
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return a.st_dev != b.st_dev;
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}
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static int mount_one(const char *t[]) {
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int r;
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assert(t);
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if ((r = is_mount_point(t[MOUNT_WHERE])) < 0)
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return r;
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if (r > 0)
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return 0;
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/* The access mode here doesn't really matter too much, since
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* the mounted file system will take precedence anyway. */
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mkdir(t[MOUNT_WHERE], 0755);
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log_debug("Mounting %s to %s of type %s with options %s.",
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t[MOUNT_WHAT],
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t[MOUNT_WHERE],
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t[MOUNT_TYPE],
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strna(t[MOUNT_OPTIONS]));
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if (mount(t[MOUNT_WHAT],
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t[MOUNT_WHERE],
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t[MOUNT_TYPE],
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0,
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t[MOUNT_OPTIONS]) < 0) {
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log_error("Failed to mount %s: %s", t[MOUNT_WHERE], strerror(errno));
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return -errno;
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}
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return 0;
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}
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int mount_setup(void) {
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int r;
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const char **t;
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for (t = table; *t; t += MOUNT_SKIP)
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if ((r = mount_one(t)) < 0)
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return r;
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return 0;
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}
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