110 lines
3.6 KiB
C
110 lines
3.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "proc-cmdline.h"
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#include "raw-reboot.h"
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#include "reboot-util.h"
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#include "string-util.h"
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#include "umask-util.h"
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#include "virt.h"
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int update_reboot_parameter_and_warn(const char *parameter, bool keep) {
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int r;
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if (isempty(parameter)) {
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if (keep)
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return 0;
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if (unlink("/run/systemd/reboot-param") < 0) {
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if (errno == ENOENT)
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return 0;
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return log_warning_errno(errno, "Failed to unlink reboot parameter file: %m");
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}
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return 0;
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}
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RUN_WITH_UMASK(0022) {
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r = write_string_file("/run/systemd/reboot-param", parameter,
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WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
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if (r < 0)
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return log_warning_errno(r, "Failed to write reboot parameter file: %m");
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}
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return 0;
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}
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int read_reboot_parameter(char **parameter) {
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int r;
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assert(parameter);
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r = read_one_line_file("/run/systemd/reboot-param", parameter);
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if (r < 0 && r != -ENOENT)
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return log_debug_errno(r, "Failed to read /run/systemd/reboot-param: %m");
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return 0;
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}
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int reboot_with_parameter(RebootFlags flags) {
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int r;
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/* Reboots the system with a parameter that is read from /run/systemd/reboot-param. Returns 0 if
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* REBOOT_DRY_RUN was set and the actual reboot operation was hence skipped. If REBOOT_FALLBACK is
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* set and the reboot with parameter doesn't work out a fallback to classic reboot() is attempted. If
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* REBOOT_FALLBACK is not set, 0 is returned instead, which should be considered indication for the
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* caller to fall back to reboot() on its own, or somehow else deal with this. If REBOOT_LOG is
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* specified will log about what it is going to do, as well as all errors. */
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if (detect_container() == 0) {
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_cleanup_free_ char *parameter = NULL;
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r = read_one_line_file("/run/systemd/reboot-param", ¶meter);
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if (r < 0 && r != -ENOENT)
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log_full_errno(flags & REBOOT_LOG ? LOG_WARNING : LOG_DEBUG, r,
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"Failed to read reboot parameter file, ignoring: %m");
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if (!isempty(parameter)) {
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log_full(flags & REBOOT_LOG ? LOG_INFO : LOG_DEBUG,
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"Rebooting with argument '%s'.", parameter);
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if (flags & REBOOT_DRY_RUN)
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return 0;
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(void) raw_reboot(LINUX_REBOOT_CMD_RESTART2, parameter);
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log_full_errno(flags & REBOOT_LOG ? LOG_WARNING : LOG_DEBUG, errno,
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"Failed to reboot with parameter, retrying without: %m");
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}
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}
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if (!(flags & REBOOT_FALLBACK))
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return 0;
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log_full(flags & REBOOT_LOG ? LOG_INFO : LOG_DEBUG, "Rebooting.");
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if (flags & REBOOT_DRY_RUN)
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return 0;
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(void) reboot(RB_AUTOBOOT);
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return log_full_errno(flags & REBOOT_LOG ? LOG_ERR : LOG_DEBUG, errno, "Failed to reboot: %m");
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}
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int shall_restore_state(void) {
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bool ret;
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int r;
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r = proc_cmdline_get_bool("systemd.restore_state", &ret);
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if (r < 0)
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return r;
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return r > 0 ? ret : true;
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}
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