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-rw-r--r--src/systemctl/systemctl-set-default.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/src/systemctl/systemctl-set-default.c b/src/systemctl/systemctl-set-default.c
new file mode 100644
index 0000000..7ddba17
--- /dev/null
+++ b/src/systemctl/systemctl-set-default.c
@@ -0,0 +1,160 @@
+/* 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 == -ERFKILL)
+ return log_error_errno(r, "Failed to get default target: Unit file is masked.");
+ 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;
+ InstallChange *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);
+ install_changes_dump(r, "set default", changes, n_changes, arg_quiet);
+ if (r < 0)
+ goto finish;
+ } 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)
+ goto finish;
+ }
+ }
+
+ emit_cmdline_warning();
+
+ if (!arg_quiet) {
+ _cleanup_free_ char *final = NULL;
+
+ r = determine_default(&final);
+ if (r < 0)
+ goto finish;
+
+ if (!streq(final, unit))
+ log_notice("Note: \"%s\" is the default unit (possibly a runtime override).", final);
+ }
+
+finish:
+ install_changes_free(changes, n_changes);
+
+ return r < 0 ? r : 0;
+}