dbus: install some properties on the job objects

dbus-job.c

@@ -1,5 +1,7 @@
 /*-*- Mode: C; c-basic-offset: 8 -*-*/
 
+#include <errno.h>
+
 #include "dbus.h"
 #include "log.h"
 
@@ -7,13 +9,99 @@ static const char introspection[] =
         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
         "<node>"
         " <interface name=\"org.freedesktop.systemd1.Job\">"
+        "  <property name=\"Id\" type=\"u\" access=\"read\"/>"
+        "  <property name=\"Unit\" type=\"(so)\" access=\"read\"/>"
+        "  <property name=\"Type\" type=\"s\" access=\"read\"/>"
+        "  <property name=\"State\" type=\"s\" access=\"read\"/>"
         " </interface>"
         BUS_PROPERTIES_INTERFACE
         BUS_INTROSPECTABLE_INTERFACE
         "</node>";
 
+static int bus_job_append_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
+        Job *j = data;
+        const char *state;
+
+        assert(m);
+        assert(i);
+        assert(property);
+        assert(j);
+
+        state = job_state_to_string(j->state);
+
+        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static int bus_job_append_type(Manager *m, DBusMessageIter *i, const char *property, void *data) {
+        Job *j = data;
+        const char *type;
+
+        assert(m);
+        assert(i);
+        assert(property);
+        assert(j);
+
+        type = job_type_to_string(j->type);
+
+        if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &type))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static int bus_job_append_unit(Manager *m, DBusMessageIter *i, const char *property, void *data) {
+        Job *j = data;
+        DBusMessageIter sub;
+        char *p;
+        const char *id;
+
+        assert(m);
+        assert(i);
+        assert(property);
+        assert(j);
+
+        if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
+                return -ENOMEM;
+
+        if (!(p = unit_dbus_path(j->unit)))
+                return -ENOMEM;
+
+        id = unit_id(j->unit);
+
+        if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) ||
+            !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
+                free(p);
+                return -ENOMEM;
+        }
+
+        free(p);
+
+        if (!dbus_message_iter_close_container(i, &sub))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static DBusHandlerResult bus_job_message_dispatch(Job *j, DBusMessage *message) {
+
+        const BusProperty properties[] = {
+                { "org.freedesktop.systemd1.Job", "Id",    bus_property_append_uint32, "u",    &j->id },
+                { "org.freedesktop.systemd1.Job", "State", bus_job_append_state,       "s",    j      },
+                { "org.freedesktop.systemd1.Job", "Type",  bus_job_append_type,        "s",    j      },
+                { "org.freedesktop.systemd1.Job", "Unit",  bus_job_append_unit,        "(so)", j      },
+                { NULL, NULL, NULL, NULL, NULL }
+        };
+
+        return bus_default_message_handler(j->manager, message, introspection, properties);
+}
+
 DBusHandlerResult bus_job_message_handler(DBusConnection  *connection, DBusMessage  *message, void *data) {
         Manager *m = data;
+        Job *j;
+        int r;
 
         assert(connection);
         assert(message);
@@ -24,7 +112,18 @@ DBusHandlerResult bus_job_message_handler(DBusConnection  *connection, DBusMessa
                   dbus_message_get_member(message),
                   dbus_message_get_path(message));
 
-        return bus_default_message_handler(m, message, introspection, NULL);
+        if ((r = manager_get_job_from_dbus_path(m, dbus_message_get_path(message), &j)) < 0) {
+
+                if (r == -ENOMEM)
+                        return DBUS_HANDLER_RESULT_NEED_MEMORY;
+
+                if (r == -ENOENT)
+                        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+
+                return bus_send_error_reply(m, message, NULL, r);
+        }
+
+        return bus_job_message_dispatch(j, message);
 }
 
 const DBusObjectPathVTable bus_job_vtable = {

manager.c

@@ -1257,3 +1257,26 @@ int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
 
         return 0;
 }
+
+int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
+        Job *j;
+        unsigned id;
+        int r;
+
+        assert(m);
+        assert(s);
+        assert(_j);
+
+        if (!startswith(s, "/org/freedesktop/systemd1/job/"))
+                return -EINVAL;
+
+        if ((r = safe_atou(s + 30, &id)) < 0)
+                return r;
+
+        if (!(j = manager_get_job(m, id)))
+                return -ENOENT;
+
+        *_j = j;
+
+        return 0;
+}

manager.h

@@ -109,6 +109,7 @@ Job *manager_get_job(Manager *m, uint32_t id);
 Unit *manager_get_unit(Manager *m, const char *name);
 
 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u);
+int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j);
 
 int manager_load_unit(Manager *m, const char *path_or_name, Unit **_ret);
 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, Job **_ret);