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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <getopt.h>
#include <sys/socket.h>
#include <unistd.h>
#include "sd-messages.h"
#include "battery-util.h"
#include "build.h"
#include "errno-util.h"
#include "fd-util.h"
#include "glyph-util.h"
#include "io-util.h"
#include "log.h"
#include "main-func.h"
#include "parse-util.h"
#include "plymouth-util.h"
#include "pretty-print.h"
#include "proc-cmdline.h"
#include "socket-util.h"
#include "terminal-util.h"
#include "time-util.h"
#define BATTERY_LOW_MESSAGE \
"Battery level critically low. Please connect your charger or the system will power off in 10 seconds."
#define BATTERY_RESTORED_MESSAGE \
"A.C. power restored, continuing."
static bool arg_doit = true;
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-battery-check", "8", &link);
if (r < 0)
return log_oom();
printf("%s\n\n"
"%sCheck battery level to see whether there's enough charge.%s\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
ansi_highlight(),
ansi_normal(),
link);
return 0;
}
static int plymouth_send_message(const char *mode, const char *message) {
_cleanup_free_ char *plymouth_message = NULL;
int c, r;
assert(mode);
assert(message);
c = asprintf(&plymouth_message,
"C\x02%c%s%c"
"M\x02%c%s%c",
(int) strlen(mode) + 1, mode, '\x00',
(int) strlen(message) + 1, message, '\x00');
if (c < 0)
return log_oom();
/* We set SOCK_NONBLOCK here so that we rather drop the message than wait for plymouth */
r = plymouth_send_raw(plymouth_message, c, SOCK_NONBLOCK);
if (r < 0)
return log_full_errno(ERRNO_IS_NO_PLYMOUTH(r) ? LOG_DEBUG : LOG_WARNING, r,
"Failed to communicate with plymouth: %m");
return 0;
}
static int parse_argv(int argc, char * argv[]) {
enum {
ARG_VERSION = 0x100,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (optind < argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"%s takes no argument.",
program_invocation_short_name);
return 1;
}
static int run(int argc, char *argv[]) {
_cleanup_free_ char *plymouth_message = NULL;
_cleanup_close_ int fd = -EBADF;
int r;
log_setup();
r = proc_cmdline_get_bool("systemd.battery_check", PROC_CMDLINE_STRIP_RD_PREFIX|PROC_CMDLINE_TRUE_WHEN_MISSING, &arg_doit);
if (r < 0)
log_warning_errno(r, "Failed to parse systemd.battery_check= kernel command line option, ignoring: %m");
r = parse_argv(argc, argv);
if (r <= 0)
return r;
if (!arg_doit) {
log_info("Checking battery status and AC power existence is disabled by the kernel command line, skipping execution.");
return 0;
}
r = battery_is_discharging_and_low();
if (r < 0) {
log_warning_errno(r, "Failed to check battery status, ignoring: %m");
return 0;
}
if (r == 0)
return 0;
log_struct(LOG_EMERG,
LOG_MESSAGE("%s " BATTERY_LOW_MESSAGE, special_glyph(SPECIAL_GLYPH_LOW_BATTERY)),
"MESSAGE_ID=" SD_MESSAGE_BATTERY_LOW_WARNING_STR);
fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
if (fd < 0)
log_warning_errno(fd, "Failed to open console, ignoring: %m");
else
dprintf(fd, ANSI_HIGHLIGHT_RED "%s " BATTERY_LOW_MESSAGE ANSI_NORMAL "\n",
special_glyph_full(SPECIAL_GLYPH_LOW_BATTERY, /* force_utf = */ false));
if (asprintf(&plymouth_message, "%s " BATTERY_LOW_MESSAGE,
special_glyph_full(SPECIAL_GLYPH_LOW_BATTERY, /* force_utf = */ true)) < 0)
return log_oom();
(void) plymouth_send_message("shutdown", plymouth_message);
usleep_safe(10 * USEC_PER_SEC);
r = battery_is_discharging_and_low();
if (r < 0)
return log_warning_errno(r, "Failed to check battery status, assuming not charged yet, powering off: %m");
if (r > 0) {
log_struct(LOG_EMERG,
LOG_MESSAGE("Battery level critically low, powering off."),
"MESSAGE_ID=" SD_MESSAGE_BATTERY_LOW_POWEROFF_STR);
return r;
}
log_info(BATTERY_RESTORED_MESSAGE);
if (fd >= 0)
dprintf(fd, BATTERY_RESTORED_MESSAGE "\n");
(void) plymouth_send_message("boot-up", BATTERY_RESTORED_MESSAGE);
return 0;
}
DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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