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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "bus-error.h"
#include "bus-locator.h"
#include "proc-cmdline.h"
#include "systemctl-daemon-reload.h"
#include "systemctl-set-default.h"
#include "systemctl-util.h"
#include "systemctl.h"
static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
char **ret = data;
if (streq(key, "systemd.unit")) {
if (proc_cmdline_value_missing(key, value))
return 0;
if (!unit_name_is_valid(value, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
log_warning("Unit name specified on %s= is not valid, ignoring: %s", key, value);
return 0;
}
return free_and_strdup_warn(ret, key);
} else if (!value) {
if (runlevel_to_target(key))
return free_and_strdup_warn(ret, key);
}
return 0;
}
static void emit_cmdline_warning(void) {
if (arg_quiet || arg_root)
/* don't bother checking the commandline if we're operating on a container */
return;
_cleanup_free_ char *override = NULL;
int r;
r = proc_cmdline_parse(parse_proc_cmdline_item, &override, 0);
if (r < 0)
log_debug_errno(r, "Failed to parse kernel command line, ignoring: %m");
if (override)
log_notice("Note: found \"%s\" on the kernel commandline, which overrides the default unit.",
override);
}
static int determine_default(char **ret_name) {
int r;
if (install_client_side()) {
r = unit_file_get_default(arg_scope, arg_root, ret_name);
if (r < 0)
return log_error_errno(r, "Failed to get default target: %m");
return 0;
} else {
sd_bus *bus;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
const char *name;
r = acquire_bus(BUS_MANAGER, &bus);
if (r < 0)
return r;
r = bus_call_method(bus, bus_systemd_mgr, "GetDefaultTarget", &error, &reply, NULL);
if (r < 0)
return log_error_errno(r, "Failed to get default target: %s", bus_error_message(&error, r));
r = sd_bus_message_read(reply, "s", &name);
if (r < 0)
return bus_log_parse_error(r);
return free_and_strdup_warn(ret_name, name);
}
}
int verb_get_default(int argc, char *argv[], void *userdata) {
_cleanup_free_ char *name = NULL;
int r;
r = determine_default(&name);
if (r < 0)
return r;
printf("%s\n", name);
emit_cmdline_warning();
return 0;
}
int verb_set_default(int argc, char *argv[], void *userdata) {
_cleanup_free_ char *unit = NULL;
UnitFileChange *changes = NULL;
size_t n_changes = 0;
int r;
assert(argc >= 2);
assert(argv);
r = unit_name_mangle_with_suffix(argv[1], "set-default",
arg_quiet ? 0 : UNIT_NAME_MANGLE_WARN,
".target", &unit);
if (r < 0)
return log_error_errno(r, "Failed to mangle unit name: %m");
if (install_client_side()) {
r = unit_file_set_default(arg_scope, UNIT_FILE_FORCE, arg_root, unit, &changes, &n_changes);
unit_file_dump_changes(r, "set default", changes, n_changes, arg_quiet);
if (r > 0)
r = 0;
} else {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
sd_bus *bus;
polkit_agent_open_maybe();
r = acquire_bus(BUS_MANAGER, &bus);
if (r < 0)
return r;
r = bus_call_method(bus, bus_systemd_mgr, "SetDefaultTarget", &error, &reply, "sb", unit, 1);
if (r < 0)
return log_error_errno(r, "Failed to set default target: %s", bus_error_message(&error, r));
r = bus_deserialize_and_dump_unit_file_changes(reply, arg_quiet, &changes, &n_changes);
if (r < 0)
goto finish;
/* Try to reload if enabled */
if (!arg_no_reload) {
r = daemon_reload(ACTION_RELOAD, /* graceful= */ false);
if (r > 0)
r = 0;
} else
r = 0;
}
emit_cmdline_warning();
if (!arg_quiet) {
_cleanup_free_ char *final = NULL;
r = determine_default(&final);
if (r < 0)
return r;
if (!streq(final, unit))
log_notice("Note: \"%s\" is the default unit (possibly a runtime override).", final);
}
finish:
unit_file_changes_free(changes, n_changes);
return r;
}
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