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ac-power: add --low switch to systemd-ac-power tool

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This allows checking from shell scripts whether the system is in a low
battery state. It just exposed the code we anyway have in a directly
accessible way.

This is also very useful for testing things.
This commit is contained in:
Lennart Poettering 2023-06-05 12:14:12 +02:00
parent c41e3605ec
commit 7f1520c6a1
2 changed files with 30 additions and 4 deletions
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8
man/systemd-ac-power.xml
View file

@ -50,6 +50,14 @@
<listitem><para>Show result as text instead of just returning success or failure.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--low</option></term>
<listitem><para>Instead of showing AC power state, show low battery state. In this case will return
zero if all batteries are currently discharging and below 5% of maximum charge. Returns non-zero
otherwise.</para></listitem>
</varlistentry>
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
</variablelist>

26
src/ac-power/ac-power.c
View file

@ -8,12 +8,18 @@
static bool arg_verbose = false;
static enum {
ACTION_AC_POWER,
ACTION_LOW,
} arg_action = ACTION_AC_POWER;
static void help(void) {
printf("%s\n\n"
"Report whether we are connected to an external power source.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -v --verbose Show state as text\n",
" -v --verbose Show state as text\n"
" --low Checks if battery is discharing and low\n",
program_invocation_short_name);
}
@ -21,12 +27,14 @@ static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_LOW,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "verbose", no_argument, NULL, 'v' },
{ "low", no_argument, NULL, ARG_LOW },
{}
};
@ -50,6 +58,10 @@ static int parse_argv(int argc, char *argv[]) {
arg_verbose = true;
break;
case ARG_LOW:
arg_action = ACTION_LOW;
break;
case '?':
return -EINVAL;
@ -78,9 +90,15 @@ static int run(int argc, char *argv[]) {
if (r <= 0)
return r;
r = on_ac_power();
if (r < 0)
return log_error_errno(r, "Failed to read AC status: %m");
if (arg_action == ACTION_AC_POWER) {
r = on_ac_power();
if (r < 0)
return log_error_errno(r, "Failed to read AC status: %m");
} else {
r = battery_is_discharging_and_low();
if (r < 0)
return log_error_errno(r, "Failed to read battery discharging + low status: %m");
}
if (arg_verbose)
puts(yes_no(r));