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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <unistd.h>
#include "bootspec.h"
#include "bus-error.h"
#include "bus-locator.h"
#include "efivars.h"
#include "parse-util.h"
#include "path-util.h"
#include "process-util.h"
#include "reboot-util.h"
#include "systemctl-logind.h"
#include "systemctl-start-special.h"
#include "systemctl-start-unit.h"
#include "systemctl-trivial-method.h"
#include "systemctl-util.h"
#include "systemctl.h"
static int load_kexec_kernel(void) {
_cleanup_(boot_config_free) BootConfig config = BOOT_CONFIG_NULL;
_cleanup_free_ char *kernel = NULL, *initrd = NULL, *options = NULL;
const BootEntry *e;
pid_t pid;
int r;
if (kexec_loaded()) {
log_debug("Kexec kernel already loaded.");
return 0;
}
if (access(KEXEC, X_OK) < 0)
return log_error_errno(errno, KEXEC" is not available: %m");
r = boot_config_load_auto(&config, NULL, NULL);
if (r == -ENOKEY)
/* The call doesn't log about ENOKEY, let's do so here. */
return log_error_errno(r,
"No kexec kernel loaded and autodetection failed.\n%s",
is_efi_boot()
? "Cannot automatically load kernel: ESP mount point not found."
: "Automatic loading works only on systems booted with EFI.");
if (r < 0)
return r;
r = boot_config_select_special_entries(&config, /* skip_efivars= */ false);
if (r < 0)
return r;
e = boot_config_default_entry(&config);
if (!e)
return log_error_errno(SYNTHETIC_ERRNO(ENOENT),
"No boot loader entry suitable as default, refusing to guess.");
log_debug("Found default boot loader entry in file \"%s\"", e->path);
if (!e->kernel)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"Boot entry does not refer to Linux kernel, which is not supported currently.");
if (strv_length(e->initrd) > 1)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"Boot entry specifies multiple initrds, which is not supported currently.");
kernel = path_join(e->root, e->kernel);
if (!kernel)
return log_oom();
if (!strv_isempty(e->initrd)) {
initrd = path_join(e->root, e->initrd[0]);
if (!initrd)
return log_oom();
}
options = strv_join(e->options, " ");
if (!options)
return log_oom();
log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
"%s "KEXEC" --load \"%s\" --append \"%s\"%s%s%s",
arg_dry_run ? "Would run" : "Running",
kernel,
options,
initrd ? " --initrd \"" : NULL, strempty(initrd), initrd ? "\"" : "");
if (arg_dry_run)
return 0;
r = safe_fork("(kexec)", FORK_WAIT|FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
if (r < 0)
return r;
if (r == 0) {
const char* const args[] = {
KEXEC,
"--load", kernel,
"--append", options,
initrd ? "--initrd" : NULL, initrd,
NULL
};
/* Child */
execv(args[0], (char * const *) args);
_exit(EXIT_FAILURE);
}
return 0;
}
static int set_exit_code(uint8_t code) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
sd_bus *bus;
int r;
r = acquire_bus(BUS_MANAGER, &bus);
if (r < 0)
return r;
r = bus_call_method(bus, bus_systemd_mgr, "SetExitCode", &error, NULL, "y", code);
if (r < 0)
return log_error_errno(r, "Failed to set exit code: %s", bus_error_message(&error, r));
return 0;
}
int verb_start_special(int argc, char *argv[], void *userdata) {
bool termination_action; /* An action that terminates the system, can be performed also by signal. */
enum action a;
int r;
assert(argv);
a = verb_to_action(argv[0]);
r = logind_check_inhibitors(a);
if (r < 0)
return r;
if (arg_force >= 2) {
r = must_be_root();
if (r < 0)
return r;
}
termination_action = IN_SET(a, ACTION_HALT, ACTION_POWEROFF, ACTION_REBOOT);
if (termination_action) {
r = prepare_firmware_setup();
if (r < 0)
return r;
r = prepare_boot_loader_menu();
if (r < 0)
return r;
r = prepare_boot_loader_entry();
if (r < 0)
return r;
}
if (a == ACTION_REBOOT) {
const char *arg = NULL;
if (argc > 1) {
if (arg_reboot_argument)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Both --reboot-argument= and positional argument passed to reboot command, refusing.");
log_notice("Positional argument to reboot command is deprecated, please use --reboot-argument= instead. Accepting anyway.");
arg = argv[1];
} else
arg = arg_reboot_argument;
if (arg) {
r = update_reboot_parameter_and_warn(arg, false);
if (r < 0)
return r;
}
} else if (a == ACTION_KEXEC) {
r = load_kexec_kernel();
if (r < 0 && arg_force >= 1)
log_notice("Failed to load kexec kernel, continuing without.");
else if (r < 0)
return r;
} else if (a == ACTION_EXIT && argc > 1) {
uint8_t code;
/* If the exit code is not given on the command line, don't reset it to zero: just keep it as
* it might have been set previously. */
r = safe_atou8(argv[1], &code);
if (r < 0)
return log_error_errno(r, "Invalid exit code.");
r = set_exit_code(code);
if (r < 0)
return r;
}
if (termination_action && arg_force >= 2)
return halt_now(a);
if (arg_force >= 1 &&
(termination_action || IN_SET(a, ACTION_KEXEC, ACTION_EXIT)))
r = verb_trivial_method(argc, argv, userdata);
else {
/* First try logind, to allow authentication with polkit */
if (IN_SET(a,
ACTION_POWEROFF,
ACTION_REBOOT,
ACTION_KEXEC,
ACTION_HALT,
ACTION_SUSPEND,
ACTION_HIBERNATE,
ACTION_HYBRID_SLEEP,
ACTION_SUSPEND_THEN_HIBERNATE)) {
r = logind_reboot(a);
if (r >= 0)
return r;
if (IN_SET(r, -EACCES, -EOPNOTSUPP, -EINPROGRESS))
/* Requested operation requires auth, is not supported or already in progress */
return r;
/* On all other errors, try low-level operation. In order to minimize the difference
* between operation with and without logind, we explicitly enable non-blocking mode
* for this, as logind's shutdown operations are always non-blocking. */
arg_no_block = true;
} else if (IN_SET(a, ACTION_EXIT))
/* Since exit is so close in behaviour to power-off/reboot, let's also make
* it asynchronous, in order to not confuse the user needlessly with unexpected
* behaviour. */
arg_no_block = true;
r = verb_start(argc, argv, userdata);
}
if (termination_action && arg_force < 2 &&
IN_SET(r, -ENOENT, -ETIMEDOUT))
log_notice("It is possible to perform action directly, see discussion of --force --force in man:systemctl(1).");
return r;
}
int verb_start_system_special(int argc, char *argv[], void *userdata) {
/* Like start_special above, but raises an error when running in user mode */
if (arg_scope != LOOKUP_SCOPE_SYSTEM)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Bad action for %s mode.",
arg_scope == LOOKUP_SCOPE_GLOBAL ? "--global" : "--user");
return verb_start_special(argc, argv, userdata);
}
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