systemctl: split up humungous systemctl.c file

This is just some refactoring: shifting around of code, not change in
codeflow.

This splits up the way too huge systemctl.c in multiple more easily
digestable files. It roughly follows the rule that each family of verbs
gets its own .c/.h file pair, and so do all the compat executable names
we support. Plus three extra files for sysv compat (which existed before
already, but I renamed slightly, to get the systemctl- prefix lik
everything else), a -util file with generic stuff everything uses, and a
-logind file with everything that talks directly to logind instead of
PID1.

systemctl is still a bit too complex for my taste, but I think this way
itc omes in a more digestable bits at least.

No change of behaviour, just reshuffling of some code.

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 0000000000..435ab0e480
--- /dev/null
+++ b/src/systemctl/systemctl-log-setting.c
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#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]);
+}