1 files changed, 96 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..88b2e49
--- /dev/null
+++ b/src/systemctl/systemctl-log-setting.c
@@ -0,0 +1,96 @@
+/* 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"
+#include "verb-log-control.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");
+}
+
+int verb_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 verb_log_control_common(bus, "org.freedesktop.systemd1", 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 verb_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;
+
+        r = verb_log_control_common(bus, dbus_name, argv[0], argv[2]);
+
+        if (r == -EBADR)
+                give_log_control1_hint(dbus_name);
+
+        return r;
+}