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134 lines
3.7 KiB
C
134 lines
3.7 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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typedef struct MountPoint {
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const char *what;
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const char *where;
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const char *type;
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const char *options;
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unsigned long flags;
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} MountPoint;
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static const MountPoint mount_table[] = {
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{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV },
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{ "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV },
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{ "devtmps", "/dev", "devtmpfs", "mode=755", MS_NOSUID },
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{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NOEXEC|MS_NODEV },
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{ "devpts", "/dev/pts", "devpts", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV },
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{ "cgroup", "/cgroup/debug", "cgroup", "debug", MS_NOSUID|MS_NOEXEC|MS_NODEV },
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{ "debugfs", "/sys/kernel/debug", "debugfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV }
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};
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bool mount_point_is_api(const char *path) {
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unsigned i;
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/* Checks if this mount point is considered "API", and hence
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* should be ignored */
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for (i = 0; i < ELEMENTSOF(mount_table); i ++)
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if (path_startswith(path, mount_table[i].where))
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return true;
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return false;
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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 MountPoint *p) {
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int r;
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assert(p);
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if ((r = is_mount_point(p->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_p(p->where, 0755);
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log_debug("Mounting %s to %s of type %s with options %s.",
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p->what,
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p->where,
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p->type,
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strna(p->options));
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if (mount(p->what,
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p->where,
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p->type,
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p->flags,
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p->options) < 0) {
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log_error("Failed to mount %s: %s", p->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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unsigned i;
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for (i = 0; i < ELEMENTSOF(mount_table); i ++)
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if ((r = mount_one(mount_table+i)) < 0)
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return r;
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return 0;
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}
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