1 /* SPDX-License-Identifier: LGPL-2.1+ */
6 #include "alloc-util.h"
9 #include "raw-reboot.h"
10 #include "reboot-util.h"
11 #include "string-util.h"
12 #include "umask-util.h"
15 int update_reboot_parameter_and_warn(const char *parameter
) {
18 if (isempty(parameter
)) {
19 if (unlink("/run/systemd/reboot-param") < 0) {
23 return log_warning_errno(errno
, "Failed to unlink reboot parameter file: %m");
29 RUN_WITH_UMASK(0022) {
30 r
= write_string_file("/run/systemd/reboot-param", parameter
,
31 WRITE_STRING_FILE_CREATE
|WRITE_STRING_FILE_ATOMIC
);
33 return log_warning_errno(r
, "Failed to write reboot parameter file: %m");
39 int reboot_with_parameter(RebootFlags flags
) {
42 /* Reboots the system with a parameter that is read from /run/systemd/reboot-param. Returns 0 if REBOOT_DRY_RUN
43 * was set and the actual reboot operation was hence skipped. If REBOOT_FALLBACK is set and the reboot with
44 * parameter doesn't work out a fallback to classic reboot() is attempted. If REBOOT_FALLBACK is not set, 0 is
45 * returned instead, which should be considered indication for the caller to fall back to reboot() on its own,
46 * or somehow else deal with this. If REBOOT_LOG is specified will log about what it is going to do, as well as
49 if (detect_container() == 0) {
50 _cleanup_free_
char *parameter
= NULL
;
52 r
= read_one_line_file("/run/systemd/reboot-param", ¶meter
);
53 if (r
< 0 && r
!= -ENOENT
)
54 log_full_errno(flags
& REBOOT_LOG
? LOG_WARNING
: LOG_DEBUG
, r
,
55 "Failed to read reboot parameter file, ignoring: %m");
57 if (!isempty(parameter
)) {
59 log_full(flags
& REBOOT_LOG
? LOG_INFO
: LOG_DEBUG
,
60 "Rebooting with argument '%s'.", parameter
);
62 if (flags
& REBOOT_DRY_RUN
)
65 (void) raw_reboot(LINUX_REBOOT_CMD_RESTART2
, parameter
);
67 log_full_errno(flags
& REBOOT_LOG
? LOG_WARNING
: LOG_DEBUG
, errno
,
68 "Failed to reboot with parameter, retrying without: %m");
72 if (!(flags
& REBOOT_FALLBACK
))
75 log_full(flags
& REBOOT_LOG
? LOG_INFO
: LOG_DEBUG
, "Rebooting.");
77 if (flags
& REBOOT_DRY_RUN
)
80 (void) reboot(RB_AUTOBOOT
);
82 return log_full_errno(flags
& REBOOT_LOG
? LOG_ERR
: LOG_DEBUG
, errno
, "Failed to reboot: %m");