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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/***
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 <errno.h>
#include <mntent.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include "basic/exit-status.h"
#include "basic/log.h"
#include "mount-setup.h"
#include "basic/mount-util.h"
#include "basic/path-util.h"
#include "basic/process-util.h"
#include "basic/signal-util.h"
#include "basic/strv.h"
#include "basic/util.h"
/* Goes through /etc/fstab and remounts all API file systems, applying
* options that are in /etc/fstab that systemd might not have
* respected */
int main(int argc, char *argv[]) {
_cleanup_hashmap_free_free_ Hashmap *pids = NULL;
_cleanup_endmntent_ FILE *f = NULL;
struct mntent* me;
int r;
if (argc > 1) {
log_error("This program takes no argument.");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
f = setmntent("/etc/fstab", "r");
if (!f) {
if (errno == ENOENT) {
r = 0;
goto finish;
}
r = log_error_errno(errno, "Failed to open /etc/fstab: %m");
goto finish;
}
pids = hashmap_new(NULL);
if (!pids) {
r = log_oom();
goto finish;
}
while ((me = getmntent(f))) {
pid_t pid;
int k;
char *s;
/* Remount the root fs, /usr and all API VFS */
if (!mount_point_is_api(me->mnt_dir) &&
!path_equal(me->mnt_dir, "/") &&
!path_equal(me->mnt_dir, "/usr"))
continue;
log_debug("Remounting %s", me->mnt_dir);
pid = fork();
if (pid < 0) {
r = log_error_errno(errno, "Failed to fork: %m");
goto finish;
}
if (pid == 0) {
/* Child */
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
(void) prctl(PR_SET_PDEATHSIG, SIGTERM);
execv(MOUNT_PATH, STRV_MAKE(MOUNT_PATH, me->mnt_dir, "-o", "remount"));
log_error_errno(errno, "Failed to execute " MOUNT_PATH ": %m");
_exit(EXIT_FAILURE);
}
/* Parent */
s = strdup(me->mnt_dir);
if (!s) {
r = log_oom();
goto finish;
}
k = hashmap_put(pids, PID_TO_PTR(pid), s);
if (k < 0) {
free(s);
r = log_oom();
goto finish;
}
}
r = 0;
while (!hashmap_isempty(pids)) {
siginfo_t si = {};
char *s;
if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
if (errno == EINTR)
continue;
r = log_error_errno(errno, "waitid() failed: %m");
goto finish;
}
s = hashmap_remove(pids, PID_TO_PTR(si.si_pid));
if (s) {
if (!is_clean_exit(si.si_code, si.si_status, NULL)) {
if (si.si_code == CLD_EXITED)
log_error(MOUNT_PATH " for %s exited with exit status %i.", s, si.si_status);
else
log_error(MOUNT_PATH " for %s terminated by signal %s.", s, signal_to_string(si.si_status));
r = -ENOEXEC;
}
free(s);
}
}
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
|
