1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2017 Felipe Sateler
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 <errno.h>
#include <sys/prctl.h>
#include "bus-util.h"
#include "bus-error.h"
#include "def.h"
#include "log.h"
#include "process-util.h"
#include "sd-bus.h"
#include "signal-util.h"
static int reload_manager(sd_bus *bus) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
int r;
log_info("Reloading system manager configuration");
r = sd_bus_message_new_method_call(
bus,
&m,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"Reload");
if (r < 0)
return bus_log_create_error(r);
/* Note we use an extra-long timeout here. This is because a reload or reexec means generators are rerun which
* are timed out after DEFAULT_TIMEOUT_USEC. Let's use twice that time here, so that the generators can have
* their timeout, and for everything else there's the same time budget in place. */
r = sd_bus_call(bus, m, DEFAULT_TIMEOUT_USEC * 2, &error, NULL);
if (r < 0)
return log_error_errno(r, "Failed to reload daemon: %s", bus_error_message(&error, r));
return 0;
}
static int start_default_target(sd_bus *bus) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
log_info("Starting default target");
/* Start these units only if we can replace base.target with it */
r = sd_bus_call_method(bus,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"StartUnit",
&error,
NULL,
"ss", "default.target", "isolate");
if (r < 0)
log_error("Failed to start default target: %s", bus_error_message(&error, r));
return r;
}
static int fork_wait(const char* const cmdline[]) {
pid_t pid;
int r;
r = safe_fork("(sulogin)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
if (r < 0)
return r;
if (r == 0) {
/* Child */
execv(cmdline[0], (char**) cmdline);
log_error_errno(errno, "Failed to execute %s: %m", cmdline[0]);
_exit(EXIT_FAILURE); /* Operational error */
}
return wait_for_terminate_and_check(cmdline[0], pid, WAIT_LOG_ABNORMAL);
}
static void print_mode(const char* mode) {
printf("You are in %s mode. After logging in, type \"journalctl -xb\" to view\n"
"system logs, \"systemctl reboot\" to reboot, \"systemctl default\" or \"exit\"\n"
"to boot into default mode.\n", mode);
fflush(stdout);
}
int main(int argc, char *argv[]) {
static const char* const sulogin_cmdline[] = {SULOGIN, NULL};
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
int r;
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
print_mode(argc > 1 ? argv[1] : "");
(void) fork_wait(sulogin_cmdline);
r = bus_connect_system_systemd(&bus);
if (r < 0) {
log_warning_errno(r, "Failed to get D-Bus connection: %m");
r = 0;
} else {
(void) reload_manager(bus);
r = start_default_target(bus);
}
return r >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
|
