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-rw-r--r--src/systemctl/systemctl-log-setting.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/src/systemctl/systemctl-log-setting.c b/src/systemctl/systemctl-log-setting.c
new file mode 100644
index 0000000..64984e4
--- /dev/null
+++ b/src/systemctl/systemctl-log-setting.c
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "bus-error.h"
+#include "bus-locator.h"
+#include "pretty-print.h"
+#include "syslog-util.h"
+#include "systemctl-log-setting.h"
+#include "systemctl-util.h"
+#include "systemctl.h"
+
+static void give_log_control1_hint(const char *name) {
+ _cleanup_free_ char *link = NULL;
+
+ if (arg_quiet)
+ return;
+
+ (void) terminal_urlify_man("org.freedesktop.LogControl1", "5", &link);
+
+ log_notice("Hint: the service must declare BusName= and implement the appropriate D-Bus interface.\n"
+ " See the %s for details.", link ?: "org.freedesktop.LogControl1(5) man page");
+}
+
+static int log_setting_internal(sd_bus *bus, const BusLocator* bloc, const char *verb, const char *value) {
+ assert(bus);
+ assert(STR_IN_SET(verb, "log-level", "log-target", "service-log-level", "service-log-target"));
+
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ bool level = endswith(verb, "log-level");
+ int r;
+
+ if (value) {
+ if (level) {
+ if (log_level_from_string(value) < 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "\"%s\" is not a valid log level.", value);
+ }
+
+ r = bus_set_property(bus, bloc,
+ level ? "LogLevel" : "LogTarget",
+ &error, "s", value);
+ if (r >= 0)
+ return 0;
+
+ log_error_errno(r, "Failed to set log %s of %s to %s: %s",
+ level ? "level" : "target",
+ bloc->destination, value, bus_error_message(&error, r));
+ } else {
+ _cleanup_free_ char *t = NULL;
+
+ r = bus_get_property_string(bus, bloc,
+ level ? "LogLevel" : "LogTarget",
+ &error, &t);
+ if (r >= 0) {
+ puts(t);
+ return 0;
+ }
+
+ log_error_errno(r, "Failed to get log %s of %s: %s",
+ level ? "level" : "target",
+ bloc->destination, bus_error_message(&error, r));
+ }
+
+ if (sd_bus_error_has_names(&error, SD_BUS_ERROR_UNKNOWN_METHOD,
+ SD_BUS_ERROR_UNKNOWN_OBJECT,
+ SD_BUS_ERROR_UNKNOWN_INTERFACE,
+ SD_BUS_ERROR_UNKNOWN_PROPERTY))
+ give_log_control1_hint(bloc->destination);
+ return r;
+}
+
+int log_setting(int argc, char *argv[], void *userdata) {
+ sd_bus *bus;
+ int r;
+
+ assert(argc >= 1 && argc <= 2);
+
+ r = acquire_bus(BUS_MANAGER, &bus);
+ if (r < 0)
+ return r;
+
+ return log_setting_internal(bus, bus_systemd_mgr, argv[0], argv[1]);
+}
+
+static int service_name_to_dbus(sd_bus *bus, const char *name, char **ret_dbus_name) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_free_ char *bus_name = NULL;
+ int r;
+
+ /* First, look for the BusName= property */
+ _cleanup_free_ char *dbus_path = unit_dbus_path_from_name(name);
+ if (!dbus_path)
+ return log_oom();
+
+ r = sd_bus_get_property_string(
+ bus,
+ "org.freedesktop.systemd1",
+ dbus_path,
+ "org.freedesktop.systemd1.Service",
+ "BusName",
+ &error,
+ &bus_name);
+ if (r < 0)
+ return log_error_errno(r, "Failed to obtain BusName= property of %s: %s",
+ name, bus_error_message(&error, r));
+
+ if (isempty(bus_name)) {
+ log_error("Unit %s doesn't declare BusName=.", name);
+ give_log_control1_hint(name);
+ return -ENOLINK;
+ }
+
+ *ret_dbus_name = TAKE_PTR(bus_name);
+ return 0;
+}
+
+int service_log_setting(int argc, char *argv[], void *userdata) {
+ sd_bus *bus;
+ _cleanup_free_ char *unit = NULL, *dbus_name = NULL;
+ int r;
+
+ assert(argc >= 2 && argc <= 3);
+
+ r = acquire_bus(BUS_FULL, &bus);
+ if (r < 0)
+ return r;
+
+ r = unit_name_mangle_with_suffix(argv[1], argv[0],
+ arg_quiet ? 0 : UNIT_NAME_MANGLE_WARN,
+ ".service", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to mangle unit name: %m");
+
+ r = service_name_to_dbus(bus, unit, &dbus_name);
+ if (r < 0)
+ return r;
+
+ const BusLocator bloc = {
+ .destination = dbus_name,
+ .path = "/org/freedesktop/LogControl1",
+ .interface = "org.freedesktop.LogControl1",
+ };
+
+ return log_setting_internal(bus, &bloc, argv[0], argv[2]);
+}