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/* Setup necessary system files for, e.g. UTMP (tracking logins)
*
* Copyright (c) 2012-2025 Joachim Wiberg <troglobit@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "config.h" /* Generated by configure script */
#include <ftw.h>
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#endif
#include <string.h>
#ifdef _LIBITE_LITE
# include <libite/lite.h>
#else
# include <lite/lite.h>
#endif
#include "config.h"
#include "finit.h"
#include "helpers.h"
#include "plugin.h"
#include "util.h"
#include "utmp-api.h"
#include "log.h"
static int is_tmpfs(char *path)
{
struct mntent mount;
struct mntent *mnt;
char buf[256];
int tmpfs = 0;
FILE *fp;
char *dir;
/* If path is a symlink, check what it resolves to */
dir = realpath(path, NULL);
if (!dir)
return 0; /* Outlook not so good */
fp = setmntent("/proc/mounts", "r");
if (!fp) {
free(dir);
return 0; /* Dunno, maybe not */
}
while ((mnt = getmntent_r(fp, &mount, buf, sizeof(buf)))) {
if (!strcmp(dir, mnt->mnt_dir))
break;
}
if (mnt && !strcmp("tmpfs", mnt->mnt_type))
tmpfs = 1;
endmntent(fp);
free(dir);
return tmpfs;
}
static int bootclean(const char *fpath, const struct stat *sb, int tflag, struct FTW *ftw)
{
if (ftw->level == 0)
return 1;
dbg("Removing %s ...", fpath);
(void)remove(fpath);
return 0;
}
/*
* Cleanup stale files from previous boot, if any still linger on.
* Some systems, e.g. Alpine Linux, still have a persistent /run and
* /tmp, i.e. not tmpfs.
*
* We can safely skip tmpfs, nothing to clean there.
*/
static void clean(void *arg)
{
char *dir[] = {
"/tmp/",
"/var/run/",
"/var/lock/",
NULL
};
for (int i = 0; dir[i]; i++) {
if (is_tmpfs(dir[i]))
continue;
nftw(dir[i], bootclean, 20, FTW_DEPTH);
}
}
/* Kernel defines the following compulsory and recommended links
* https://github.com/torvalds/linux/blob/v5.18/Documentation/admin-guide/devices.rst#compulsory-links
*/
static void kernel_links(void)
{
struct {
char *tgt, *lnk;
int optional;
} k[] = {
{ "/proc/self/fd", "/dev/fd", 0 },
{ "fd/0", "/dev/stdin", 0 },
{ "fd/1", "/dev/stdout", 0 },
{ "fd/2", "/dev/stderr", 0 },
{ "socksys", "/dev/nfsd", 0 },
{ "null", "/dev/X0R", 0 },
{ "/proc/kcore", "/dev/core", 1 },
{ "ram0", "/dev/ramdisk", 1 },
{ "qft0", "/dev/ftape", 1 },
{ "video0", "/dev/bttv0", 1 },
{ "radio0", "/dev/radio", 1 },
};
char *fn, buf[80];
size_t i;
for (i = 0; i < NELEMS(k); i++) {
fn = k[i].tgt;
if (k[i].optional) {
if (fn[0] != '/') {
snprintf(buf, sizeof(buf), "/dev/%s", k[i].tgt);
fn = buf;
}
if (!fexist(fn))
continue;
}
ln(k[i].tgt, k[i].lnk);
}
}
/*
* Setup standard FHS 2.3 structure in /var, and write runlevel to UTMP
*/
static void setup(void *arg)
{
mode_t prev;
prev = umask(0);
/* Kernel symlinks, e.g. /proc/self/fd -> /dev/fd */
kernel_links();
/* Create all system tmpfiles.d(5) */
run_interactive(_PATH_TMPFILES " --create", "Creating required directories and files");
/* Set BOOT_TIME UTMP entry */
utmp_set_boot();
umask(prev);
}
static plugin_t plugin = {
.name = __FILE__,
.hook[HOOK_MOUNT_POST] = { .cb = clean },
.hook[HOOK_BASEFS_UP] = { .cb = setup },
.depends = { "pidfile" },
};
PLUGIN_INIT(__init)
{
plugin_register(&plugin);
}
PLUGIN_EXIT(__exit)
{
plugin_unregister(&plugin);
}
/**
* Local Variables:
* indent-tabs-mode: t
* c-file-style: "linux"
* End:
*/
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