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/***
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 Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
#include "alloc-util.h"
#include "extract-word.h"
#include "fileio.h"
#include "macro.h"
#include "parse-util.h"
#include "proc-cmdline.h"
#include "process-util.h"
#include "special.h"
#include "string-util.h"
#include "util.h"
#include "virt.h"
int proc_cmdline(char **ret) {
const char *e;
assert(ret);
/* For testing purposes it is sometimes useful to be able to override what we consider /proc/cmdline to be */
e = secure_getenv("SYSTEMD_PROC_CMDLINE");
if (e) {
char *m;
m = strdup(e);
if (!m)
return -ENOMEM;
*ret = m;
return 0;
}
if (detect_container() > 0)
return get_process_cmdline(1, 0, false, ret);
else
return read_one_line_file("/proc/cmdline", ret);
}
int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value, void *data),
void *data,
bool strip_prefix) {
_cleanup_free_ char *line = NULL;
const char *p;
int r;
assert(parse_item);
r = proc_cmdline(&line);
if (r < 0)
return r;
p = line;
for (;;) {
_cleanup_free_ char *word = NULL;
char *value = NULL, *unprefixed;
r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
if (r < 0)
return r;
if (r == 0)
break;
/* Filter out arguments that are intended only for the
* initrd */
unprefixed = startswith(word, "rd.");
if (unprefixed && !in_initrd())
continue;
value = strchr(word, '=');
if (value)
*(value++) = 0;
r = parse_item(strip_prefix && unprefixed ? unprefixed : word, value, data);
if (r < 0)
return r;
}
return 0;
}
int get_proc_cmdline_key(const char *key, char **value) {
_cleanup_free_ char *line = NULL, *ret = NULL;
bool found = false;
const char *p;
int r;
assert(key);
r = proc_cmdline(&line);
if (r < 0)
return r;
p = line;
for (;;) {
_cleanup_free_ char *word = NULL;
const char *e;
r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
if (r < 0)
return r;
if (r == 0)
break;
/* Filter out arguments that are intended only for the
* initrd */
if (!in_initrd() && startswith(word, "rd."))
continue;
if (value) {
e = startswith(word, key);
if (!e)
continue;
r = free_and_strdup(&ret, e);
if (r < 0)
return r;
found = true;
} else {
if (streq(word, key))
found = true;
}
}
if (value) {
*value = ret;
ret = NULL;
}
return found;
}
int shall_restore_state(void) {
_cleanup_free_ char *value = NULL;
int r;
r = get_proc_cmdline_key("systemd.restore_state=", &value);
if (r < 0)
return r;
if (r == 0)
return true;
return parse_boolean(value);
}
static const char * const rlmap[] = {
"emergency", SPECIAL_EMERGENCY_TARGET,
"-b", SPECIAL_EMERGENCY_TARGET,
"rescue", SPECIAL_RESCUE_TARGET,
"single", SPECIAL_RESCUE_TARGET,
"-s", SPECIAL_RESCUE_TARGET,
"s", SPECIAL_RESCUE_TARGET,
"S", SPECIAL_RESCUE_TARGET,
"1", SPECIAL_RESCUE_TARGET,
"2", SPECIAL_MULTI_USER_TARGET,
"3", SPECIAL_MULTI_USER_TARGET,
"4", SPECIAL_MULTI_USER_TARGET,
"5", SPECIAL_GRAPHICAL_TARGET,
NULL
};
static const char * const rlmap_initrd[] = {
"emergency", SPECIAL_EMERGENCY_TARGET,
"rescue", SPECIAL_RESCUE_TARGET,
NULL
};
const char* runlevel_to_target(const char *word) {
size_t i;
const char * const *rlmap_ptr = in_initrd() ? rlmap_initrd
: rlmap;
if (!word)
return NULL;
if (in_initrd() && (word = startswith(word, "rd.")) == NULL)
return NULL;
for (i = 0; rlmap_ptr[i] != NULL; i += 2)
if (streq(word, rlmap_ptr[i]))
return rlmap_ptr[i+1];
return NULL;
}
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